83results about How to "Reduce the effects of stray light" patented technology

The invention relates to a near-to-eye display type optical system based on a curved surface microlens array, wherein comprises a flexible OLED (organic light emitting diode) display element, and a microlens array manufactured on a curved surface, wherein the curved surface of the OLED and the curved surface of the microlens array are concentric spherical surfaces, the semi-diameter of the curved surface of the OLED is slightly greater, the positions of pixel units of the OLED on the spherical surface are corresponding to the positions of the microlens array one by one, the centers of the OLED and the microlens array are on the same semi-diameter after the assembling. By adopting the microlens array, the weight and the volume of an optical imaging part of the near-to-eye display optical system are obviously decreased, the whole system can be lightened and miniaturized; the microlens array closes to the OLED display unit, so that the light energy utilization rate is increased, the image brightness is increased and the influence of stray light is decreased.

The invention discloses an automatic light inspection machine foreign matter detection device, which includes more than one detection stations. Each detection station is equipped with a camera to provide a bright field light source assembly for bright field lighting and provide a dark field light source assembly for dark field lighting. The bright field light source assembly and the dark field light source assembly illuminate one to-be-detected bottle alternately, and the camera performs image acquisition on the to-be-detected bottle when the to-be-detected bottle is illuminated. The device provided by the invention has the characteristics of simple structure, low cost, high detection efficiency and accuracy, and can simultaneously realize bright field and dark field detection at one station.

The invention discloses a method for measuring the sight line stabilizing accuracy of a photoelectric sight-stabilizing system, and belongs to the technical field of optical measurement. The method is characterized by comprising the following steps that: a plane reflector is fixed on an inner ring frame of the photoelectric sight-stabilizing system to be measured, the photoelectric sight-stabilizing system to be measured is in a vibration state, a measuring laser beam is subjected to strength stabilization, spatial filtering and collimation and then irradiates the plane reflector, a complementary metal oxide semiconductor (CMOS) camera transmits a light spot image sequence of a reflected light beam imaged on a target surface to an image recording and processing system, and the image recording and processing system performs a series of processing on the light spot image sequence to obtain a light spot center-of-mass coordinate sequence, a stabilizing accuracy value sequence and stabilizing accuracy value sequence standard deviation, so that the stabilizing accuracy is measured. By the method, the high-accuracy measurement of the sight line stabilizing accuracy of the photoelectric sight-stabilizing system is realized; and the method can be popularized to the fields of measurement of the stabilizing accuracy of a gun control system and the like, and is wide in application prospect.

The invention discloses a wave aberration measuring device and a wave aberration measuring method of an optical system. The device comprises a linear polarization plane wave producing source, a 1 / 2 wave plate, a polarization splitting prism, a 1 / 4 wave plate, a reflection unit and an HS (Shack-Hartmann) wave-front sensor, wherein the linear polarization plane wave producing source is used for generating a linear polarization plane wave; the 1 / 2 wave plate is used for converting the linear polarization plane wave to be an s polarization plane wave; the polarization splitting prism is used for reflecting the s polarization plane wave transmitted by the 1 / 2 wave plate to be 1 / 4 wave plate, and transmitting p polarized light transmitted by the 1 / 4 wave plate, and converting a circular polarization plane wave of the reflecting device to be a p polarization plane wave; the reflecting device is used for returning a circular polarization plane of the 1 / 4 wave plate along the same route; and the HS wave-front sensor is used for measuring the wave aberration of the p polarized light entering the HS wave-front sensor. The wave aberration measuring device is capable of realizing the high-precision detection of various complicate optical systems.

The invention provides a micro spherical type short coherent point diffraction interference measurement system and method and belongs to the micro spherical type detection technical field. The micro spherical type short coherent point diffraction interference measurement system and method aims at solving the problems that the contrast ratio of the interference field of the existing short coherent point diffraction interference measurement method is poor and accordingly the measurement accuracy is affected. The micro spherical type short coherent point diffraction interference measurement system comprises a short coherent laser, a first half lambda wave plate, a rectangular reflecting mirror, a polarization splitting prism, a first pyramid prism, a first plane mirror, a second pyramid prism, a PZT (Piezoelectric Ceramic Transducer) phase shifter, a delay platform, a second half lambda wave plate, an optical fiber coupling mirror, a single-mode polarization-maintaining optical fiber, a convergent lens, a pinhole lens, a first collimating lens, a quarter lambda wave plate, a micro-objective, a second plane mirror, a second collimating lens, a polaroid, an area array CCD (Charge Coupled Device) and a computer. According to the micro spherical type short coherent point diffraction interference measurement method, an optical path structure that the quarter lambda wave plate is combined with the polaroid is adopted to select beams in the interference field and accordingly direct current components in the beams are reduced, the contrast ratio of interference fringes is improved, and the adjustable optimization of the contrast ratio is implemented. The micro spherical type short coherent point diffraction interference measurement system and method is applied to the micro spherical type detection.

The invention discloses a stimulated Raman scattering (SRS) compensation method in a distributed optical fiber temperature sensor system. The method comprises the following steps of: (1) at specific pumping light power and specific optical fiber length (L), calculating the backward transmission light intensity after the optical power of a forward transmitted self-emitted Raman scattering signal is subjected to Rayleigh scattering at the L and the backward transmission light intensity after the pumping light is subjected to forward transmission and Rayleigh scattering at the L; (2) calculatinga stimulated scattering process by using the numerical value of a RungeKutta method to obtain SRS signal light; (3) acquiring a self-emitted Raman scattering signal and an SRS signal at a random point z of an optical fiber according to the step (2); (4) acquiring the magnification of the self-emitted Raman scattering signal due to stimulation; and (5) acquiring a real Raman scattering signal according to the magnification. By the method, the influence of SRS can be eliminated, and the precision of temperature measurement is improved.

A intelligent synthesized measuring apparatus for half wave voltage of extinction ratio in crystal, and phase delay of wave plate which is featured as setting a spectroscope in 45 degree to forward direction of light beam, setting polarizer, article to be tested, analyzer, the first photoelectric detector, the first demodulation and amplification circuit as well as the first A / D converter, a signal line connection computer of the first A / D converter in sequence at transmission direction of the spectroscope, the first output of the computer is rotated around optical axis by a first step motor driving analyzer, the second output of the computer is rotated around optical axis by a second step motor driving article to be tested; and an attenuator, the second photoelectric detector, the second demodulation and amplification circuit as well as the second A / D converter, a signal line connection computer of the second A / D converter in sequence at reflection direction of the spectroscope. The invention can not only complete integration measurement of a plurality of parameters, but also has characters of high measurement accuracy, good reliability, and convenient operation.

The invention discloses an all-fiber laser radar aerosol detecting device. The all-fiber laser radar aerosol detecting device comprises a signal emitting channel, a signal receiving channel and a signal processing channel, wherein the signal emitting channel is used for emitting a laser signal, the signal receiving channel is used for receiving the emitted laser signal and an echo signal produced by the part, emitted to the atmosphere, of the laser signal, the signal processing channel is used for converting the echo signal into an electric signal for performing analyzing, and the signal emitting channel, the signal receiving channel and the signal processing channel are all of an all-fiber structure. The all-fiber laser radar aerosol detecting device has the advantages of continuous high repetition frequency, high sensitivity and the like, the adopted all-fiber structure can detect signals with the picowatt magnitude reaching to 20 kHz, a very high temporal-spatial resolution is achieved, and the whole system is small in size and high in stability.

The invention relates to a nano spectral analysis and electrochemical analysis technique, and relates to a dark-field nano spectral electrochemical detection pool for plasma observation. The detection pool comprises a quartz glass plate, a circular electrode and a bearing plate which are all transparent structures, wherein a circular electrode fixing pool, a channel, a flowing injection port and an outflow port on the channel, a reference electrode fixing port, a counter electrode fixing port, a deoxygenization space, an inert gas feeding port, a gas extraction port and an electrode lead connection channel are arranged on the quartz glass plate; and the quartz glass plate and the bearing plate are formed into a sandwich layer, the circular electrode is fastened in the electrode fixing pool, and the quartz glass plate and the bearing plate are hermetically fixed by using screws. According to the invention, a light path is easy to calibrate, an operation of deoxygenization is convenient, and a working electrode is easy to install, remove and replace; and the detection pool has spatial discrimination and micro-area analysis capabilities, so that the detection pool can be used as a technique for carrying out observation and acquisition on resonance Rayleigh scattered spectrums of plasmas generated by single nanoparticles and generated by that single nanoparticles and molecules of an interface solution are interacted under the condition of electrochemical control.

The invention discloses a method for adaptively determining the optimal polarization orientation in a polarization vision system. The method comprises the following steps of: compositing polarization images in any polarization orientation by means of any three polarization images in the known polarization orientation; and evaluating the definition of the polarization images so as to determine the optimal polarization orientation for the polarization vision system. The invention provides the inexpensive, objective and convenient method, so that the problem that the orientation of a polarizer in the conventional polarization vision system is difficult to determine is solved; and after the optimal polarization orientation is determined, the influence of stray light can be eliminated to the greatest extent, and the imaging quality is greatly improved.

The invention discloses a method for detecting the diopter of a rigid endoscope based on a liquid lens. A mechanical movement device in a detection device is an electric control device, human intervention is reduced, the measurement precision is improved, and the automation degree is high. CCD imaging and computer display are adopted, the human eyes are replaced, direct observation is carried out through the endoscope, observation fatigue is avoided, and the operation is convenient. The focal length of a liquid zoom lens is changed through changing voltage of a liquid zoom lens so as to replace a focusing lens group, the diopter of the rigid endoscope is enabled to be only related with the voltage of the liquid zoom lens, the operation is simple, the precision is high, and measurement errors are reduced. Influences of stray light are eliminated through carrying a test in a darkroom or adopting a light barrier, so that the detection result is enabled to be more accurate.

The invention discloses a spectral measurement system and a measurement method. The system comprises a micro spectrometer for acquiring spectrum of a sample to be measured through an acquiring light path and performing filtering and light splitting through a filter, a standard reflecting plate for reflecting visible light spectrum energy to obtain initial spectrum information, and a mobile terminal which is provided with an LED lamp and a camera and is used for lighting the sample to be measured, obtaining the initial reference spectrum intensity, acquiring dark noise strength of a camera and the spectrum intensity of the sample to be measured, and then obtaining the spectrum reflectivity of the sample to be measured according to the initial reference spectrum intensity, the dark noise strength, and the spectrum intensity of the sample to be measured. With the adoption of the system, the spectrum data with the same standard can be acquired under any different acquiring environments, so that the measuring adaptability is improved, and moreover, the spectrum data accuracy and stability can be effectively ensured.

The invention provides an accurate measurement method for the signal-to-noise ratio of a fiber optic spectrometer. The method includes the following steps that first, related devices are connected; second, measurement on the signal-to-noise ratio of the fiber optic spectrometer under different light intensities is achieved; third, the specific value between a correction average value mu of a signal corresponding to the ith exposure pixel of an array photoelectric detector and a jittering value sigma of a signal deflection average value is calculated through N times of signal acquisition and measurement. By the adoption of the scheme, the method can adapt to the measurement requirement of the signal-to-noise ratio of the fiber optic spectrometer, not only can influences of stray light be decreased or reduced, but also the intensity of incident light of the fiber optic spectrometer can be conveniently and fast changed through a variable optical attenuator, and accurate measurement on the signal-to-noise ratio of the fiber optic spectrometer under different light intensities is achieved.

The invention discloses a spectral responsivity calibrating method and device. Through the combination of a continuously-adjustable single-wavelength radiation source, a laser device capable of outputting more than one discrete-wavelength laser and an optical mixer, the measurement of spectral irradiance and spectral radiance can be achieved, and a spectral responsivity curve can be calibrated through discrete spectral responsivity so as to improve accuracy of measurement. The spectral responsivity calibrating device has the advantages of being simple in structure, complete in function, high in cost-performance ratio, convenient to operate, popularize and use and the like.

The invention discloses a device for measuring the linear interval and the face response characteristics of a photoelectric detector. The device comprises a laser source, a first diaphragm, a laser power stabilizer, a laser power attenuator, a second diaphragm, a beam splitter prism, a first optical switch, a second optical switch, a first reflection mirror, a second reflection mirror, an integrating sphere, the photoelectric detector to be measured, an electrical signal amplifier, a data acquisition card, a computer and a thermostat. According to the device, the characteristic that the illumination of outgoing laser of the integrating sphere is even is mainly used, the advantages of being narrow in line width, stable in power and the like of the laser source are used, accurate measurement on the straightness and the face response evenness of different photoelectric detectors under the specific wave length can be achieved, and the device has the advantages of being rapid and convenient to use, large in dynamic range, high in interference resistance and the like. The repeated measurement accuracy of the device is higher than 0.05%.

This invention provides a wave aberration measuring device used for measuring the wave aberration of a projection objective of a photo-etching device. The wave aberration measuring device comprises a light source, a lightning system, an object plane mask, a projection objective, and an image plane detection unit. Light emitted by the light source passes through the lighting system to form a lighting beam, and the lighting beam is incident on the object plane mask on an object plane of the projection objective. The object plane mask includes a small hole tag, and the lighting beam is diffracted through a small hole to form an ideal spherical wave. The ideal spherical wave passes through the projection objective to form a spherical wave carrying wave aberration of the projection objective, and the spherical wave is projected on the image plane detection unit. The image plane detection unit detects the spherical wave carrying wave aberration of the projection objective to acquire wave aberration information of the projection objective. The wave aberration measuring device is characterized in that the image plane detection unit includes a base and a detector, the upper surface of the base contains a grating tag, the lower surface of the base contains a window tag, the spherical wave carrying wave aberration of the projection objective is diffracted through the grating tag to generate light at a +1 level and light at a -1 level, the light at a +1 level and the light at a -1 level converge at the window tag on the lower surface of the base, the light at a +1 level and the light at a -1 level overlap and interfere with each other to form an interference image after passing through the window tag, and the interference image is recorded by the detector.

The invention discloses a theodolite type laser coarse pointing mechanism which comprises a pitch axis assembly and a pitch auxiliary supporting assembly which are installed on the two side walls of aU-shaped frame respectively. An azimuth axis assembly penetrates through the bottom face of the U-shaped frame to be installed, the two ends of the load are respectively connected with the pitching shaft assembly and the pitching auxiliary support assembly, and the two ends of a pitch axis locking arm are respectively connected with the load and a pitch axis locking and releasing device. A coil part and an armature part of a parking electromagnet are respectively connected with the pitch axis locking and releasing device and the pitch axis locking arm, the two ends of the azimuth axis lockingarm are respectively connected with the U-shaped frame and the azimuth axis locking and releasing device, and a light path assembly is arranged at the outer side of the pitching auxiliary supportingassembly. According to the invention, the problems of low data transmission rate, low tracking precision, poor long-distance communication quality, slow response speed, low tracking bandwidth, much signal energy dissipation, larger space size, high transportation and emission cost and the like of a traditional radio frequency antenna turntable communication device are solved.

The invention relates to a split type laser focusing device. The split type laser focusing device comprises a first reflecting mirror, a second reflecting mirror, a third reflecting mirror and an output focusing mirror, wherein the reflecting surface of the first reflecting mirror and the reflecting surface of the third reflecting mirror are planes; the reflecting surface of the second reflectingmirror is a ring-shaped circular-arc-shaped concave surface or an equivalent Fresnel surface; the output focusing mirror is equipped with a tapered surface; the first reflecting mirror is used for receiving and reflecting an incoming laser beam to the second reflecting mirror; emergent light of the first reflecting mirror comes into the second reflecting mirror with a small angle; the second reflecting mirror is used for receiving emergent light of the first reflecting mirror and reflecting the emergent light to the third reflecting mirror; the third reflecting mirror is used for receiving emergent light of the second reflecting mirror and reflecting the emergent light to the output focusing mirror; and the output focusing mirror is used for receiving emergent light of the third reflectingmirror, and is emitted by the tapered surface of the output focusing mirror, so that a similar bessel beam is formed. The split type laser focusing device is high in energy utilization rate; and thecenter spot size and light intensity of the output similar bessel beam are basically unchanged within a position focusing range on the axis of the output focusing mirror.

The invention discloses a hard endoscope luminous efficiency uniformity detection method. The method is used for detecting the luminous efficiency uniformity of the imaging lens of a hard endoscope and the comprehensive luminous efficiency uniformity of the imaging lens and an illumination lens in the hard endoscope based on a detection system. According to the detection method, an adopted detection device is in the form of an electric control device, so that the human intervention is reduced. Meanwhile, the measuring precision is improved, and the degree of automation is high. A CCD camera is adopted for imaging and a computer is adopted for displaying data. In this way, the direct observation of human eyes through an endoscope is not required, so that the observation fatigue is avoided. The operation is convenient. More information amount of a detection result, not limited to the luminous efficiency of a certain specific field-of-view band, can be reflected. Therefore, the luminous efficiency uniformity of the hard endoscope within the entire visual field can be reflected. Meanwhile, the optical performance of the hard endoscope can be better reflected. The test is conducted in a darkroom, or the influence of stray light is eliminated by a light blocking plate. As a result, the detection result is more accurate.

The invention discloses a relative diffraction efficiency tester for a Fourier transformation plane grating, belongs to the technical field of spectrums and aims to solve the problem of inconsistency of emergent spectrum bandwidth in the prior art. The relative diffraction efficiency tester has the advantages of improving the measurement precision, simplifying the operation steps and improving the measurement efficiency. According to the relative diffraction efficiency tester disclosed by the invention, light emitted by a light source module illuminates a concave collimating mirror C by sequentially passing through an incident hole and a selective aperture slot, subsequently illuminates a reference plane reflecting mirror or a to-be-tested grating on a rotary table, and then converges in an emergent hole by a concave plane imaging mirror; emergent light from the emergent hole is collimated by an off-axis collimation mirror, split by a beam-splitting cuboid A, reflected by a fixed pyramid A and a moving pyramid A and then gathers in a main detector by an off-axis imaging mirror; laser emitted by a stable-frequency laser is split by a beam-splitting cuboid B, reflected by a fixed pyramid B and a moving pyramid B and then gathers in a reference detector; the moving pyramid A and the moving pyramid B do a uniform linear motion together; the main detector is used for collecting aplanatism difference data and performing spectrum reduction and relative diffraction efficiency calculation on the collected data.

The invention provides an optical assembly with backlight monitoring. The assembly comprises a transmission substrate and at least one set of optical transmission units. A first interface, a second interface, a third interface, and a fourth interface are arranged on the transmission substrate; the first interface and the second interface are total-reflection interfaces; the third interface and thefourth interface serve as parallel interfaces for each other; and an air gap is formed between the third interface and the fourth interface. The optical transmission units include VCSEL chips, MPD chips, incident collimating lenses, first focusing lenses and second focusing lenses. The first interface, the third interface and the fourth interface cooperate with each other to form a first opticalpath; the second interface and the third interface cooperate with each other to form a second optical path; and the first optical path and the second optical path are used for front light transmissionand backlight monitoring. Therefore, problems of many materials and complicated optical path of the conventional optical assembly with the backlight monitoring scheme are solved.

The invention relates to a standard lamp for detection. The standard lamp comprises a lamp cap and a glass bulb. A stem and lamp filaments are arranged in the glass bulb. Two guide wires are led out from the interior of the stem. The two ends of the lamp filaments are connected with the guide wires respectively. The upper end face of the glass bulb is of an arc-face back taper shape. A fixing base is connected between the two guide wires and provided with a plurality of molybdenum wire hook sets. Each molybdenum wire hook set comprises a high molybdenum wire hook and a low molybdenum wire hook. The hook portion of each high molybdenum wire hook and the hook portion of each low molybdenum wire hook are located on the same vertical line. The lamp filaments sequentially penetrate through the hook portions of the tops of the molybdenum wire hooks from left to right according to a square wave shape, and are arranged on the same plane. The standard lamp reduces influence of stray light, avoids the processing difficulty that the influence of the lamp filaments is reduced on the condition that the lamp filaments are located in the center of the glass bulb when the spherical glass bulb is adopted, and improves the qualified rate.

The invention provides a fusion imaging device of two-dimensional sonar and laser distance gating imaging equipment. The fusion imaging device is characterized by comprising a sealed cabin, an image function enhancing camera, two-dimensional multi-beam sonar equipment, a watertight plug, a lithium battery, an embedded computing hardware platform, a short pulse laser, a helmet display and a two-dimensional adjusting frame. The method has the advantages that 1) the influence of underwater backward scattered light is effectively reduced by adopting laser distance gating imaging equipment, and theoptical imaging quality is greatly improved; 2) a two-dimensional adjusting frame is arranged to facilitate adjustment of view field center positions of the image function enhancing camera and the two-dimensional multi-beam sonar equipment, and a diver can manually remotely control the light beam emitting direction of the auxiliary laser light source, so that an optical image can be convenientlyand rapidly obtained after the acoustic image obtains the position of a target; 3) the structure is simple and practical and can be used as a guiding and collision device for underwater divers, and 4)the overall structure is good in bearing performance and water tightness and high in engineering application feasibility.

The invention discloses a semiconductor laser light source module for realizing a circular light spot and a side surface pumping apparatus. Multiple semiconductor lasers of the semiconductor laser light source module are annularly arranged, and the light output direction is parallel to the central axis of the annular structure; the space between every two adjacent semiconductor lasers is filled with a fan-shaped clamping block separately, so that the integrated end plane formed by the multiple semiconductor lasers and the fan-shaped clamping blocks can be a circular plane; and a locking apparatus is arranged on the periphery of the integrated part formed by the multiple semiconductor lasers and the fan-shaped clamping blocks for tightening all the semiconductor lasers to the centre to be fixed. The multiple semiconductor lasers are assembled through the fan-shaped clamping blocks to form the overall circular plane with light output surfaces in equilibrium distribution so as to directly output circular light spots; and the semiconductor laser light source module has a relatively small size and the annular structure disclosed in the scheme is relatively high in light spot uniformity.

The invention belongs to the field of medical optical coherent tomography technologies, and relates to a method for extracting information of a fluorescence tomography system for small animals. The method includes calibrating the tomography system and positioning the outer edge of a tomography cavity in a focal plane of a lens; respectively drawing luminous intensity distribution curves of emergent light of excitation light and fluorescence; selecting a range of a central angle theta of the tomography cavity and an information extraction region S mapped to a detected image; individually utilizing pixel data corresponding to a range of small luminous intensity values in the information extraction region S as a sub-region according to the luminous intensity distribution curves of the emergent light, and respectively utilizing pixel data corresponding to two-side ranges of high luminous intensity values as two sub-regions; solving an average value of measured data in each sub-region, utilizing each average value as an average detection value and reconstructing the image by the aid of all the extracted average detection values. The method has the advantages that computation can be simplified, and influence of two-side stray light can be eliminated.

The invention relates to an infrared scene simulation system, belongs to the field of infrared scene simulators, and is used for solving the defect that a high-temperature object in a low-temperature environment is difficult to realize in the prior art. The infrared scene simulation system comprises a first infrared light path, a second infrared light path and a beam combiner. The first infrared light path comprises a first black body and a first DMD subsystem, and the first DMD subsystem generates an image with 2N gray levels by taking the first black body as an infrared light source. The second DMD subsystem takes a second black body as an infrared light source to generate a 2N-level gray image. The beam combiner is used for combining the first infrared light path and the second infrared light path to form an image after gray scale superposition. And the temperatures of the first black body and the second black body are adjusted to enable the temperatures to be smaller than a first preset value and to be sufficient to simulate a target of which the temperature value is a second preset value in the infrared scene. The invention also comprises an infrared scene simulation method and a DMD control method. One application of the invention is to simulate a high-temperature object in a low-temperature scene.

The invention discloses a shearing speckle interference system based on an integrated phase shift reflector. The shearing speckle interference system is composed of an integrated phase shift reflector, a camera, a laser, a beam expander and a measured object. The integrated phase shift reflector comprises a phase shift mirror and a shearing mirror, and the phase shift mirror is connected to an integrated phase shift reflector base through a phase shifter and is driven by the phase shifter to realize phase shift; the shearing mirror is connected to the integrated phase shift reflector base through a shearing adjusting device, and the posture of the shearing mirror is adjusted through the shearing adjusting device. The shearing mirror is annular and surrounds the phase shift mirror, a shearing machine and the phase shift mirror can be coplanar by adjusting the shearing adjusting device, the inner contour of the shearing mirror is slightly larger than the outer contour of the phase shiftmirror, and the posture of the shearing mirror can be adjusted. When shearing speckle interference measurement is carried out, laser emitted by the laser irradiates the measured object through the beam expander, and laser reflected by the measured object is reflected by the shearing mirror and the phase shift mirror to enter the camera for interference imaging. The system has the advantages of being high in laser utilization rate, large in view field, small in stray light influence and the like, and is particularly suitable for large-area shearing speckle interference detection.