450 results about "Autocollimator" patented technology

A survey system is made up of a target and a surveying instrument provided with an automatic collimator that automatically collimates the target. The target includes a guide light transmitter that emits guide light, an azimuth angle sensor that detects a direction angle (θA, θB) at which the target is directed, and a central processing unit that sends a rotation command, which includes the rotational direction of the instrument body, to the surveying instrument. The central processing unit determines the rotational direction of the instrument body based on an angular difference (θB-θA) between a direction angle (θA) obtained when the target is caused to approximately face the surveying instrument at the last measurement and a direction angle (θB) obtained when the target is caused to approximately face the surveying instrument at the present measurement.

The invention relates to a device and method for detecting the dynamic properties of a two-dimensional directional mirror. The device comprises a dynamic photoelectric autocollimator, a controller of the dynamic photoelectric autocollimator, a hollow rotary platform, a controller of the hollow rotary platform, a rotary target, an adjustment platform, a data acquiring and processing system and a computer measurement and control system. Under the guidance of the computer measurement and control system, a target simulation reflector on the rotary target is driven by the rotary platform to simulate an optical target in movement, the dynamic photoelectric autocollimator provides the rapid and high-precision angle miss distance for the two-dimensional directional mirror, the data acquiring and processing system feeds back and controls the two-dimensional directional mirror to track the target simulation movement in real time, and the computer measurement and control system processes the measurement data of the photoelectric autocollimator in real time to obtain the data reflecting the dynamic response properties of the two-dimensional directional mirror. The device and method provided by the invention can be used for detection of properties of the two-dimensional directional mirror, such as axis shaking, step response, dynamic continuous tracking and the like.

This invention discloses a sort of measuring benchmark conversion method of the astronomical sensing device. The lamp-house simulator, the three-axes rotating floor and the photoelectric autocollimator shelves are fixed in the optical table, the astronomical sensing device is fixed in the inner frame of the three-axes rotating floor. A. Adjust the photoelectric autocollimator shelf and make the light axis to parallel with the inner frame of the rotating shaft. B. The middle frame and the outer frame of the rotational rotating floor obtain the data of the fixed point in different angle, and demarcate the inner parameter and outer parameter of the astronomical sensing device. Ensure the conversion matrix which is from the coordinate of the rotating floor to the coordinate of the astronomical sensing device. C. Measure the vector relation between the vertical vector of the two reflecting surface of the mirror cube and the light axes of the photoelectric autocollimator. Compute the conversion matrix which is from the coordinate of the rotating floor to the coordinate of the mirror cube. D. Compute the conversion matrix which is from the coordinate of the astronomical sensing device to the coordinate of the mirror cube. The product between the ray vectors of the astronomical sensing device and the conversion matrix is the vector direction after conversion. This invention discloses a sort of set which can realize the above method at the same time. The realization of this invention is simple and its precision is high.

The invention relates to an attitude testing apparatus and method based on an autocollimator. The apparatus mainly comprises the autocollimator, an optical hexahedron, a double-shaft electronic level meter and a pedestal with a leveling function. The method comprises the following steps: putting the attitude testing apparatus on a firm base, allowing the autocollimator to collimate a reflecting surface of an object, then collimating the optical hexahedron with an autocollimation gyro theodolite and measuring the included angle between the apparatus and a true north azimuth reference; starting the autocollimator for recording and retrieving of continuous data of the attitude of the reflecting surface of the object and starting the double-shaft electronic level meter for recording and retrieving of continuous data of horizontal attitude; and after completion of recording and retrieving of the data, processing the data of the autocollimator and the double-shaft electronic level meter by using a data processing method for the attitude testing apparatus so as to eventually obtain continuous changes of the attitude of the reflecting surface of the object in a geographic coordinate system, thereby meeting demands of continuous absolute measurement.

Machine tools can be accurately measured and positioned on manufacturing machines within very small tolerances by use of an autocollimator on a 3-axis mount on a manufacturing machine and positioned so as to focus on a reference tooling ball or a machine tool, a digital camera connected to the viewing end of the autocollimator, and a marker and measure generator for receiving digital images from the camera, then displaying or measuring distances between the projection reticle and the reference reticle on the monitoring screen, and relating the distances to the actual position of the autocollimator relative to the reference tooling ball. The images and measurements are used to set the position of the machine tool and to measure the size and shape of the machine tool tip, and examine cutting edge wear. patent

The invention discloses a triaxial air bearing table high-precision attitude angle and angular velocity measuring device. According to the invention, an intelligent measuring head, a gyroscope, and a four-side prism are arranged on an instrument platform of the triaxial air bearing table. A laser tracker is arranged below the triaxial air bearing table. Two photoelectric autocollimators are orthogonally arranged below the triaxial air bearing table. During large-angle movement, data of the gyroscopes and the laser tracker are subjected to Kalman filtering fusion, such that angle and angular velocity information of the air bearing table is obtained. During small-angle movement, data of the two photoelectric autocollimators are directly combined, such that angle and angular velocity information of the air bearing table can be obtained. With the device provided by the invention, non-contact, high-precision, and dynamic measuring of the attitude angle and angular velocity of the triaxial air bearing table can be realized. The device is also suitable for attitude angle measuring of a uniaxial air bearing table.

The present invention belongs to the technical field of optoelectronic equipment calibration, and particularly relates to a star sensor reference cube-prism installation error calibration apparatus. According to the present invention, a photoelectric autocollimator and a single star simulator are respectively placed on two orthogonal axes of a reference plane, a detected star senor is placed at the intersection point position of the two axes so as to make the normal lines of the two orthogonal light reflection surfaces of the detected star senor reference prism be respectively parallel to the two orthogonal axes, the optical axes of the photoelectric autocollimator and the single star simulator are respectively adjusted to parallel to the reference plane through a theodolite, the star sensor is installed on a star sensor three-dimensional adjustment reference base, the input optical axis of the star sensor and the output optical axis of the single star simulator are adjusted to achieve a parallel state through the star sensor three-dimensional adjustment reference base, a detected reference cube-prism is arranged on the upper surface of the housing of the detected star senor, the installation angle error of the reference cube-prism round the X-axis and the Y-axis is measured by using photoelectric autocollimation, the star sensor three-dimensional adjustment reference base rotates 90 DEG, and the installation angle error of the reference cube-prism round the Z-axis is measured.

The invention discloses a two-axis photoelectric collimator based rotary table division error detection method. The two-axis photoelectric collimator based rotary table division error detection method includes the steps: (1) mounting a multi-tooth division table at the center of the working face of an inspected rotary table, fixing a planar mirror onto the multi-tooth division table and using an autocollimator for collimating the planar mirror; (2) enabling the inspected rotary table to rotate for a circle so that both two axes of the photoelectric autocollimator have numerical reading; (3) placing the inspected rotary table at the zero position, reading initial values of the two-axis photoelectric autocollimator, then rotating the multi-tooth division table by an angle phi, and enabling the planar mirror to rotate by the angle phi along with the inspected rotary table; (4) enabling the planar mirror to rotate by the angle phi towards the opposite direction along with the multi-tooth division table, enabling the photoelectric autocollimator to collimate the planar mirror again and read measurement values until a circle is completed; and (5) changing an inclination angle of the multi-tooth division table relative to the rotary table while keeping the two-axis photoelectric autocollimator immovable, repeating the step 2, the step 3 and the step 4 for secondary detection, and reading measurement values of the two-axis photoelectric autocollimator. By the aid of the method, the requirement on adjustment is lowered.

The invention provides a satellite image navigation and registering full-physical testing device and testing method. The satellite image navigation and registering full-physical testing device comprises a three-shaft air floating table (1), an optical axis measuring system (2), an adjusting mechanism (3), a wireless communication device (4), a photoelectric autocollimator (5), a camera mounting plate (6) and on-board testing equipment such as an imaging camera (7) (including a scanning mechanism), a solar panel driving simulation mechanism (8), a gyro assembly (9), a flywheel assembly (10) and the like. The working state on orbit of a satellite is simulated, and system-level tests are carried out. According to the invention, image navigation and registering air floating table full-physical test verification and performance testing can be carried out on different loads such as a small area array and two-dimensional scanning imaging camera or a large-aperture long-linear-array big area array imaging camera, and on-board image navigation and registering technical schemes and system indexes are enabled to meet on-board requirements.

The invention relates to a method for alignment of super-long marine shafting. A plurality of optical alignment targets are arranged on the whole shafting. Both ends of the optical alignment targets are provided with stern reference targets and bow reference targets. The method mainly utilizes two times of alignment technology to carry out the alignment to the super-long shafting. During the first time of alignment, a large magnification micro-autocollimator is utilized to fix two centers of the optical alignment targets in the middle part with reference to the stern reference targets and the bow reference targets. During the second time of alignment, a micrometer autocollimator is utilized to carry out the alignment to the rest optical alignment targets with the reference to the stern reference targets, the bow reference targets, and the two centers of the optical alignment targets which are fixed during the first time of alignment. By using the method of the invention to carry out alignment to the super-long shafting, the alignment accuracy of the super-long shafting is greatly improved. The left and right symmetry degree of the main engine foundation of the super-long marine shafting, the measuring accuracy of the spacer thickness on a bearing pedestal, the positioning accuracy of a gear box and an intermediate bearing pedestal can be guaranteed.

A method for detecting optical alignment prism mounting accuracy deviation calibration of a platform system includes a non-levelness calibration method of an alignment prism and a non-perpendicularity calibration method of the alignment prism, optical alignment prism mounting accuracy deviation calibration of the platform system can be detected by the aid of a regular hexahedron, an autocollimator and two theodolites, and the technological gap of the method is filled. A large swinging angle of a detected object is allowed, namely, a large elevation difference exists, a ground horizontal plane serves as a reference, the reference does not need to be converted through a standard hexahedron, the detecting accuracy of optical alignment prism mounting accuracy deviation calibration is improved, and the method is simple to operate, high in efficiency and detecting accuracy and easy to implement.

The invention discloses a dynamic measuring method of guide rail straightness, belongs to the methods that are related to the technical field of photoelectric measurement, aims at solving the technical problem of providing a method that dynamically measures guide rail straightness, and adopts the following technical proposal: (1) an optical measuring table is prepared; (2) a component to be measured is placed on the left half part of the table, and a linear motion actuator component drives a plane mirror that is arranged on a mirror shelf to move along a guide rail synchronously with a slide block; (3) an autocollimator is placed on the right side of the component to be measured and is butt-jointed with the component to be measured, the plane mirror reflects parallel light that is emitted from the autocollimator into the view field of a light tube ocular glass; (4) a signal receiving and data processing system is placed on the right side of the autocollimator, and the focal plane of the light tube ocular glass is led to be coincided with the receiving plane of a CCD receiver; (5) the linear motion actuator component drives the slide block and the plane mirror to move in a measuring range along the guide rail, and a microprocessor is used for determining the change of the relative displacement of a reticle that is reflected by the plane mirror, thus realizing the measurement of guide rail straightness.

The invention relates to a calibration method oriented towards a coaxial counterpoint micro-assembly system, and belongs to the technical field of micro detection and micro assembly. An autocollimator is adopted. The calibration method oriented towards the coaxial counterpoint micro-assembly system comprises the steps of (1) calibrating the parallelism between a prism face and an imaging face of the autocollimator, (2) calibrating the perpendicularity between a reflected light path of a base body object stage and the imaging face of the autocollimator, and (3) calibrating the perpendicularity between reflected light rays of a target object stage and the imaging face of the autocollimator, (4) installing a CCD and a microscope lens after the autocollimator is disassembled, and carrying out fine adjustment to eliminate installation errors. The purpose that a CCD camera and the optical axis of a prism are perpendicular to the prism face is achieved, the calibration work of relative poses of components, including the prism, the target object stage, the base body object stage and the microscope lens, of the coaxial counterpoint micro-assembly system is accomplished, the assembly accuracy of the coaxial counterpoint micro-assembly system is greatly improved, and the calibration method oriented towards the coaxial counterpoint micro-assembly system is simple and easy to implement.

The invention discloses an angle measurement precision detecting device of an aspect angle monitor for a satellite. A small plane mirror is connected to a mounting base plane position of the aspect angle monitor; the aspect angle monitor for the satellite is arranged on a two-dimension inclined platform and is placed on a two-dimension translation platform; a double-faced simulation swing mirror is arranged on a three-dimension adjusting platform and is placed on a digital display turntable; a first autocollimator and a second autocollimator are placed on a lifting support; the two-dimension translation platform, the digital display turntable and the lifting support are placed on a table top of a detection platform; a central spindle is sleeved in a central hole of the digital display turntable; a standard circular device is placed on a standard block and is close to the central spindle; laser beams emitted by a laser align with a central prism of a five-mirror reflector to form a detection standard optical axis; a dial indicator is fixed on the detection platform; a gauge block is placed above the digital display turntable and between the aspect angle monitor for the satellite and the double-faced simulation swing mirror; one face of the gauge block is close to the mounting base plane of the aspect angle monitor for the satellite; and the other face of the gauge block is close to a first optical surface of the double-faced simulation swing mirror.

The invention relates to a two-dimensional laser autocollimator. The autocollimator comprises a generation device of left-hand and right-hand circular polarized light with reticule information on a horizontal optical axis, as well as a first common beam splitter prism, a collimating object lens and a target reflector which are sequentially arranged in the horizontal optical axis direction and the advance direction of a 'cross' light beam, wherein the generation device generates the left-hand and right-hand circular polarized light with the reticule information to form centrosymmetric 'cross' light beam output; the beam-splitting plane of the first common beam splitter prism is in a 45-degree included angle with the horizontal optical axis; a first lambda / 4 wave plate, a first polarization splitting prism and a horizontal linear array CCD are sequentially arranged on one side of the first common beam splitter prism; and a vertical linear array CCD is arranged in the reflected light direction of the first polarization splitting prism. The two-dimensional laser autocollimator has the characteristics of high measuring precision, large measuring range and capacity of static or dynamic measurement.

The invention discloses a self-calibration optical axis parallelism detector and a detection method, and belongs to the technical field of optical instrument detection. A standard calibration reflector employed in the invention is a rectangular leveling ruler reflector, replaces a conventional shorter reflector or conical prism, and can covers light beams from a semi-reflecting and semi-transmitting plane mirror and a plane turning reflector, thereby enabling two light beams to be calibrated through the same reference, and achieving a high-precision purpose. The detector provided by the invention enables the light beams to be able to be adjusted continuously in a range from 200 mm to 900 mm, and enables the parallelism of the light beams to be able to be adjusted in real time, wherein the parallelism precision is determined by the measurement precision of an autocollimator. Moreover, the measurement precision of the autocollimator can be traced to a national metrology institute. The detector meets the requirements of portable, multifunctional and high-precision application.

The invention discloses a device and method for adjusting tilt of a measured mirror in matching measurement of a flat sub-aperture. The device comprises a fizeau phase-shifting interferometer, a standard mirror, a semi-transparent and semi-reflection mirror, a measured mirror, a laser autocollimator, a two-dimensional translation stage, a tilt adjusting device, a rotary table, a plane reflection mirror, a computer, a detector and a focusing lens. Levelling is carried out by using the device at the position of a first sub-aperture, and a parallel reference point of the measured mirror and the standard mirror is established, and then the gradient of the measured mirror is calculated based on the reference point at the position of the other sub-apertures, and finally, the posture of the measured mirror is adjusted so that the gradient of the sub-aperture surface is reduced and the accuracy of matching measurement of the flat sub-aperture is increased.

The invention includes autocollimator with micrometer, and measuring device. Axis positioning tool set up in the measuring device is installed on output shaft of main machine. The tool set up possesses a sleeve with inner diameter being equal to external diameter of the autocollimator. Dummy spindle is such prepared that its external diameter is equal to the external diameter of the autocollimator. The dummy spindle is put into the sleeve. Using hand turning makes coaxial between the dummy spindle and the main machine. Then, the autocollimator is put into the sleeve after the dummy spindle is pulled out. Thus, it is coaxial between the autocollimator and the main machine. Light pipes including light target are installed on hole of tail shaft at front and back positions. Using the hole of tail shaft as reference makes two light targets coaxial with hole of tail shaft. Using autocollimator adjusts main machine to be coaxial with hole of tail shaft. Features are: accurate positioning.

The invention relates to a circular grating installation error calibration and correction method based on a single reading head, relating to the precision machinery field and solving the problems that the conventional precision angle measurement cannot achieve low cost, high precision, high reliability, and high temperature adaptability. The method includes that a dial gauge is used to guarantee the circular grating installation displacement error is within 10[mu]m, a metal polyhedron and a high-precision autocollimator are adopted to carry out the multi-area calibration on the circumference angle measurement error caused by the displacement error, and the angle measurement error is corrected in real time by means of least squares polynomial curve fitting in the area. The error caused by the displacement can be directly converted to the circumference angle measurement error through the space coordinate transformation method, the error correction parameters can be fitted by means of a multi-area precision calibration method, the real-time correction can be carried out during the measurement, therefore, the installation requirement of circular gratings can be reduced, and the ideal angle measurement precision can be realized by the single reading head.

The invention discloses an auxiliary collimation device of an autocollimator, and belongs to the technical field of optical detection. When auto-collimation testing is carried out, the optical axis of the autocollimator needs to be collimated with a light reflector, and meanwhile the normal of a light reflector face is parallel to the optical axis of an objective lens of the autocollimator. If the distance between the autocollimator and the light reflector is large, time and labor are wasted when the light path is adjusted, and therefore the measuring efficiency and the measuring accuracy are reduced. According to the auxiliary collimation device of the autocollimator, the relative positions and the relative directions of the autocollimator and the light reflector can be coarsely adjusted, the position of a center light beam of the autocollimator is indicated through a visible laser beam, and the position and direction relation between the autocollimator and the light reflector is judged by observing the position of a laser spot on the light reflector and the position of the reflected laser spot. On the premise that the autocollimator and the light reflector are already accurately collimated, matched calibration of the auxiliary collimation device of the autocollimator and the end face of a lens cone of the autocollimator can be further achieved.

The invention discloses a Talbot effect-based aspheric surface detection system, which comprises a semiconductor laser, a micro objective, an autocollimator objective, a first reflector, a second reflector, an aspheric mirror to be detected, a dispersion prism, a first optical grating, a second optical grating, a frosted glass plate, a charge coupled device (CCD) camera, an image acquisition card and a computer. A light beam emitted from the semiconductor laser is collimated and expanded by the micro objective and the autocollimator objective, is incident into a certain sampling position of the aspheric mirror to be detected after being turned by the first reflector and the dispersion prism, and is incident into the first optical grating by the dispersion prism after being reflected by the second reflector to form a Talbot image at a Talbot distance thereof; simultaneously, the second optical grating is arranged at the position of the Talbot image, and the Talbot image of the first optical grating and the second optical grating form a Moire fringe; the CCD camera and the image acquisition card acquires the displacement of the Moire fringe; and the computer reconstructs an aspheric surface by wavefont fitting. The Talbot effect-based aspheric surface detection system has a simple structure, and can realize the high-accuracy detection of the aspheric mirrors with large apertures or relatively steeper surfaces.

The invention provides an automatic adjusting device for an optical lens and a method thereof, wherein the device can realize automatic clamping and centring adjustment of multiple optical devices. The automatic adjusting device for the optical lens has an aligning function and a centring adjusting function of the optical lens. The device comprises a holding member, a to-be-assembled member, a feeding module, a clamping module, a coaxial aligning module, an optical centring module and an auxiliary module. Through cooperation of each part, adjustment of a precise optical lens is finished, thereby realizing automatic assembling of an optical lens with multiple lenses and spacers. The modules can be used independently or together. An application range of precise optical component assembling is expanded. The automatic adjusting device for the optical lens has advantages of man-machine cooperation, and re-configuration. According to an adjusting method for the automatic adjusting device forthe optical lens, through a cross graticule, for aiming at an image which is formed by the lens on the CCD camera of an autocollimator, a lens central error and a lens interval are obtained. Throughpose adjustment, the lens central error is eliminated, and assembling precision between the lens and a lens barrel is further improved.

Disclosed are a calculated intensity correlated imaging autocollimator and a measurement method. The calculated intensity correlated imaging autocollimator comprises a light source, a digital micromirror device (DMD), a controller, a beam splitter, a lens, a device-under-test (DUT) reflective mirror, a CCD and an intensity correlated calculation module. A synchronous control module of the controller generates a synchronous clock signal which is applied to the DMD and the CCD. The intensity correlated calculation module records a light field modulation matrix generated by a light field modulation module and an echo signal received by the CCD simultaneously, and performs second-order intensity correlated calculation to indirectly calculate a tiny rotation angle of the DUT. The invention introduces a calculated correlated imaging method in quantum imaging technology to the design of the autocollimator, and can be used for effectively reducing the measurement errors caused by air turbulence and other factors and improving the sensitivity and stability of a system.

The invention relates to a portable photoelectric autocollimator based on an area array CCD image sensor and a working method of portable photoelectric autocollimator. The autocollimator comprises an optical system and a hardware circuit system, wherein the optical system consists of a reflector and auto-collimation parallel light tubes, and the hardware circuit system consists of an area array CCD image sensor, an embedded system hardware circuit and real-time display liquid crystal; and after the area array CCD image sensor receives the image of the optical system, the data of the output image are transmitted to the embedded system hardware circuit through an acquisition channel and stored and processed, and finally, the calculated angular displacement information and the acquired image are displayed on the small area liquid crystal of the autocollimator in real time. The structure of the system is simplified and the volume of the system is reduced by adopting an embedded kernel chip, the screen displays the measurement results in real time, the measurement efficiency is improved, the operation and the use are simpler through a visual human-computer interface, and digitalization, two dimensions and portability of the photoelectric autocollimator are really realized.

The invention discloses a detection device for position and inclination angle of a chip, which comprises a light source component, a light transmission component, a photographing component and an autocollimator, wherein the light source component is constituted by a first light source and a second light source respectively corresponding to the chip and a substrate; the light transmission component is constituted by a first transflective prism, a second transflective prism and a third transflective prism, as well as a first reflector and a second reflector, so that detecting the position of the chip and the substrate is realized in an identical light path system; the photographing component is constituted by a first photographing unit and a second photographing unit which have different visual fields; the first photographing unit is used for collecting images with large visual fields of the chip or the substrate, realizing primary location according to MARK points; the second photographing unit is used for collecting specific location images; and the autocollimator is used for acquiring the normal inclination amount representing horizontal inclination angle information of the chip. The invention also discloses a corresponding detection method. According to the invention, alignment and regulation can be realized at the same time by a method with a compact structure and convenience in operation, so the detection device and method provided by the invention are particularly applicable to chip mounting.

The invention belongs to the field of optics and relates to a tiny angle measuring device and method based on a vision detecting technology. The problem that a traditional photoelectricity autocollimator is small in angle measuring range and low in system response speed is solved. According to the scheme, collimated laser beams sent by a laser device go into a mirror face of a tested reflector, reflected light rays reflected by the tested reflector are projected to a diffuse reflection projection screen, and diffuse reflection light spots are formed, the diffuse reflection light spots are collected by a high-speed CCD camera and are converted into electric signals, an electric signal output end of the high-speed CCD camera is connected with an electric signal input end of an image processing part, the image processing part obtains the tiny angle alpha generated by the tested reflector according to the linear displacement d of the diffuse reflection light spots on the diffuse reflection projection screen, and the linear displacement d is the distance between the diffuse reflection light spots during angle deviation and standard light spots when no angle deviation happens.

The invention relates to an accurate measuring method for angle between optical axis and mechanical axis in optical system, belonging to the measuring technology field for angle between optical axis and mechanical axis in optical system. The purpose is that the problem that angle between optical axis and mechanical axis in satellite optical communication system can not be measured accurately in prior technology is solved. Firstly, interferometer (1) is used to adjust the optical axis of high-accuracy plane mirror (3) to coincide with the optical axis of measured optical system (2). Secondly, autocollimator (4) is used to measure the angle alpha of the optical axis and the optical axis of high-accuracy plane mirror (3). Thirdly, autocollimator (4) is used to measure the angle beta of the optical axis and the optical axis of the second high-accuracy plane mirror on mechanical base plane of measured optical system (2). Finally, according to the formula of Delta = beta - alpha the angle Delta between the optical axis and the mechanical axis is calculated. The invention can measure the angle of optical axis and mechanical axis of satellite optical communication system accurately. The measuring accuracy of angle between the optical axis and the mechanical axis is 0.2 mu rad.

The invention relates to a horizontal one-observation set accuracy testing system of a theodolite at extreme temperature. The testing system comprises a data acquisition and control computer, an autocollimator, a constant-temperature test box, a multi-tooth division table and a planar mirror which is fixedly connected with a theodolite to be tested; the multi-tooth division table is arranged inside the constant-temperature test box and is electrically connected with the data acquisition and control computer through a cable; an optical window is arranged on the side wall of the constant-temperature test box; the theodolite to be tested is arranged on the multi-tooth division table; the autocollimator is opposite to the planar mirror, the optical window is arranged between the autocollimator and the planar mirror, and the autocollimator and the planar mirror are arranged at the same height position; and the data acquisition and control computer is respectively connected with the multi-tooth division table and the autocollimator. The invention provides a horizontal one-observation set accuracy testing system of the theodolite, which is high in automation degree, measurement accuracy and stability at the extreme temperature.

The invention discloses an optical fiber precision focusing coupling device, which comprises a reference platform and a 2-second autocollimator located at the upper end of the reference platform, and is characterized in that the front end and the rear end of the 2-second autocollimator are provided with an objective lens and an eyepiece respectively, and the 2-second autocollimator is provided with a horizontal angle micro fine tuning knob; the front end of the 2-second autocollimator is provided with an optical fiber coupling group connected to a light source control box, the optical fiber coupling group comprises an optical fiber coupling group base plate and a coupling lens group located at the upper end, the coupling lens group comprises a coupling lens group base, the coupling lens group base is provided with a coupling lens mounting surface, the lens mounting surface is provided with a coupling lens, and the front end of the coupling lens is provided with an optical fiber working end face and an optical fiber clamping group matched with the optical fiber working end face; and the coupling lens group and the optical fiber clamping group are provided with a matched water-cooling refrigeration device I and a matched water-cooling refrigeration device II respectively. The optical fiber precision focusing coupling device has the beneficial effects that the structure is simple, the adjustment method is easy to implement, and influences imposed on the actual focus position by a mechanical piece machining error, an optical piece error and an assembling error can be eliminated.

Photoelectric autocollimation methods and apparatuses based on beam drift compensation are provided. The methods and apparatuses can be used to achieve a high autocollimation angle measurement accuracy. The apparatuses includes an autocollimator, a measurement mirror (12a), a beam drift monitoring and separating unit, a beam steering device (8), and a data processing controller (7). The beam drift monitoring and separating unit generate a reference beam with the same drift as the measurement beam. The measurement beam carries both angular deflection information of the measurement mirror and the angular beam drift information, while the reference beam carries only the angular beam drift information. The data processing controller gives out a signal to the beam steering device in real-time according to the magnitude of drift of the reference beam, to compensate the drift of the measurement beam.