91 results about "Quasioptics" patented technology

The object of the invention is to provide a method of calibrating an optical FMCW backscattering measurement system that improves the precision of the measurement. The problem is solved by a method comprising the steps of A. Converting said received sensor signal to a complex received electrical signal as a function of said modulation frequency fm, said complex received electrical signal being represented by a magnitude part and a phase angle part as a function of said modulation frequency fm; B. Performing a transformation of said received electrical signal to provide a backscattering signal as a function of location between said first and second ends of said sensor and beyond said second end; C. From said backscattering signal as a function of location determining characteristics of a curve representative of said backscattering signal beyond said second end; D. Correcting said magnitude part of said received electrical signal and said phase angle part of said received electrical signal in a predetermined dependence of said curve; and E. Repeating step B) on the basis of the corrected received electrical signal.

The present invention proposes a mark for position detection which can reliably detect a mark which is the subject of detection, even when a large number of marks of the same type are present in the vicinity of this mark which is to be the subject of detection. A mark for position detection 10, which is provided upon a photosensitive substrate P, and which is used when detecting positional information for the photosensitive substrate P by an alignment optical system 9, comprises an alignment mark 1 for outputting positional information to a control device CONT by being observed by the alignment optical system 9, and a identification mark 2 which is arranged in a predetermined positional relationship with the alignment mark 1, consists of a combination of four patterns of three types, and expresses 34 types of information.

The object of the invention is to provide a method of calibrating an optical FMCW backscattering measurement system that improves the precision of the measurement. The problem is solved by a method comprising the steps of A. Converting said received sensor signal to a complex received electrical signal as a function of said modulation frequency fm, said complex received electrical signal being represented by a magnitude part and a phase angle part as a function of said modulation frequency fm; B. Performing a transformation of said received electrical signal to provide a backscattering signal as a function of location between said first and second ends of said sensor and beyond said second end; C. From said backscattering signal as a function of location determining characteristics of a curve representative of said backscattering signal beyond said second end; D. Correcting said magnitude part of said received electrical signal and said phase angle part of said received electrical signal in a predetermined dependence of said curve; and E. Repeating step B) on the basis of the corrected received electrical signal.

The invention provides a six-degree-of-freedom spatial coordinate position and attitude measurement device. The six-degree-of-freedom spatial coordinate position and attitude measurement device comprises a laser tracker, an attitude recognition unit and an optical attitude target, wherein the laser tracker is used for quickly tracking a target which moves in the space and is provided with the optical attitude target, aligning the target with a backward reflector on the optical attitude target, obtaining the distance from the laser tracker to the target through a retroreflection light beam, andobtaining azimuth angle and pitch angle information according to the angle measuring device at the same time; and thus, the three-dimensional position coordinates of the target are obtained. The invention has the beneficial effects that the measurement precision of the spatial three-dimensional position and the three-axis attitude angle of the target is improved, and the tracking performance andreliability of the six-degree-of-freedom laser tracker are improved.

The invention relates to a method for compensating deformation effect after exposure of a two-dimensional design layout. The method comprises the following steps of: establishing the two-dimensional design layout, and setting a key size edge placement error to be compensated; selecting a point on the design layout as a first sampling point, and then selecting sampling points at predetermined intervals from the first sampling point to partition the design layout; performing corrosion and simulation by using optical approaching correction technology to acquire edge placement errors of the points; and establishing a standard optical approaching correction model, and selecting the acquired point, the edge placement error of which is closest to the key size edge placement error, as a calculation point of the compensated edge placement error. The method saves repair of a design layout checking routine, greatly reduces time consumption, shortens the correction period, reduces the workload, and improves the accuracy.

The invention belongs to an absorbing cavity of an infrared gas sensor with wide spectrum light source within the range of an explosion-proof air detecting device for mine safety. The absorbing cavity of the infrared gas sensor is composed of an upper reflecting mirror with concave spherical surface and a lower reflecting mirror with concave spherical surface; light source position and detector position are in mutual conjugation, the lower reflecting mirror with concave spherical surface, the light source and the detector are fixed on a bracket, and the upper reflecting mirror with concave spherical surface is fixed on the housing of the sensor. The invention adopts quasi-optics resonate cavity design to enable the light source and the detector to correspond with imaging relationship after multiple light path folding, a beam imaged on the detector is in dispersion, so that the beam is evenly distributed, and the noise-signal ratio of the optical signal is improved. The invention not only reduces the volume of the absorbing cavity, but also improves the absorbing effect of tested air to light; in addition, the invention satisfies the requirement to the absorbing cavity of the infrared gas sensor with wide spectrum light source.

The proposed retro-directive quasi-optical system includes at least a lens set and a pixel array. The lens set is positioned on one side of the pixel array and the lens set instantly establishes retro-directive space channels between the pixels in the pixel array and the object(s) distributed in the accessible space defined by the lens set through infinite or finite conjugation. In the pixel array, a number of pixels are arranged as an array and each pixel is composed of at least one pair of transmitter antenna and receiver antenna. To guarantee that the electromagnetic waves transmitted from a pixel into the accessible space may be reflected back to the receiver of the same pixel, the size of each pixel is not larger than the point-spread spot size defined by the lens set, wherein the point-spread spot size can be contributed either from lens diffraction or aberration.

An optical wavelength division multiplexer and de-multiplexer for single mode or multi-mode fiber optic communication systems is provided. The device includes in its preferred embodiment a prefabricated optical block having a reflective coating on its flat upper surface and a plurality of n filters carried on its flat lower surface. A molded plastic coupling module has a flat upper surface to which the optical block and filters are adhesively mounted and the coupling module also includes a lower surface having a plurality of n aspheric lenses. In the preferred embodiment, a fiber optic cable receptacle is molded to the coupling module along with a collimating lens and a beam reflector so that, when the components are assembled, the optical pathway is passively aligned and no postfabrication alignment adjusting or tuning is required.

A device for adjusting optical elements, in particular, for X-ray analysis, comprising a holding device (2) for receiving the optical element and at least two adjusting units at least one of the two longitudinal ends of the holding device (2), wherein the adjusting units each comprise one plunger (6, 6a, 6b, 6c, 6d), characterized in that each adjusting unit comprises a rotatably disposed adjusting ring (4, 4a, 4b, 4c, 4d) with an eccentric recess, and the optical element is mechanically coupled to the inner surfaces (7) of the adjusting rings (4, 4a, 4b, 4c, 4d) via the plungers (6, 6a, 6b, 6c, 6d). The adjusting device is compact, can be flexibly used and provides simple adjustment of the optical element.

The invention discloses a day and night dual-purpose optical observing and sighting system, which is provided with a daylight system and a low-light level night vision system, wherein the daylight system comprises a low-light level objective lens, a low-light level tube and a low-light level inverter, the low-light level night vision system comprises a daylight objective lens and a daylight inverter, the low-light level inverter and the daylight inverter image a target onto the focal plane of an eye lens by means of a cemented coincidence prism and a day-night changeover switch, a half-transparent, half-reflective film system is plated on the cemented surface of the coincidence prism, and the image of the target is reflected into the eye lens by the coincidence prism, and thereby can be observed by the human eye. Compared with the prior art, the day and night dual-purpose optical observing and sighting system has a simple structure, is reasonably designed, realizes high imaging quality, effectively enhances the human-machine ergonomics of the lens, reduces the carried burden of a user, and effectively meets the requirement of all-weather application.

The invention provides a novel method for rapidly diagnosing plasma in real time through a quasi-optical resonant cavity and belongs to the field of plasma diagnosis. A diagnosis device comprises the quasi-optical resonant cavity and vector network analyzers, wherein the quasi-optical resonant cavity is a symmetric biconcave cavity or a flat concave cavity. Test signals enter the resonant cavity through a coaxial line and a coupling input hole; after penetrating through the resonant cavity, the signals are transmitted back to the vector network analyzers through a coupling output hole and a coaxial line. The two or more vector network analyzers are used for selecting different frequencies to conduct dot frequency tests (CW Sweep) and parameters of the plasma are calculated according to measuring results. The novel method is suitable for diagnosing plasma of a flight back trace type and has the advantages of being rapid, accurate and wide in measuring range.

The invention discloses a digital-micro-mirror-device-based fast precise optical focusing enhancement method and system. Region division is carried out on a digital micro mirror device and the digital micro mirror device is divided into two parts evenly; divided areas in the second part are kept to be unchanged and intensity modulation is carried out simultaneously on light beams at all divided areas in the first part at different frequencies, fluorescent light with changed intensities is excited after light beam focusing, and the excited fluorescent light is received and recorded by a photomultiplier; after Fourier transform on a fluorescent light signal, compensation phases corresponding to all divided areas are obtained; the divided areas in the first part are kept to be unchanged d intensity modulation is carried out simultaneously on light beams at all divided areas in the second part to obtain another halves of compensation phases; the divided areas with the phase values smaller than pai are kept and the divided areas with the phase values larger than pai are removed to obtain screened divided areas; and after the digital micro mirror device loads the screened divided areas, the light beams are focused in a sample to form a light spot with the higher central light intensity. On the basis of the optical diffraction principle, the beam focusing speed is increased and the light beam focusing capability is enhanced. A feasible focused light spot generation method can be provided for the non-fiber interpolation type optogenetics and the deep penetration microimaging.

The invention belongs to the optical detection field, and discloses a rapid positioning device and positioning method for optical system test. The positioning device records the test posture of a standard optical system on a test device; after a tested optical system is changed, the posture reappears on the test device; the posture goes through a series of conversion through the positioning device; the normal direction of a benchmark mirror represents the test posture of the optical system, and the optical axis of an auto-collimation light pipe is used as the standard of a standard posture; in replacing the tested optical system again, the posture can reappear only by employing a two-dimensional platform to adjust the benchmark mirror normal to be parallel with the optical axis of an auto-collimation light pipe. The device has the characteristics of simple structure and high positioning accuracy, is suitable for assembly line work of mass products, and can directly perform test of relative specifications after positioning, thereby avoid a debugging process before test in the prior art.

An optical adjointing correction mode calibration method based on multi photo resist effective diffusion length comprises: measuring calibration data, using one-dimension diagram data calibration model to judge if the diagram is a one-dimension diagram or a two-dimension diagram, when it is a one-dimension diagram, using a one-dimension diagram data calibration photo resist model, and when it is a two-dimension diagram, using a two-dimension data calibration two-dimension photo resist model to judge if the sampling point simulation error is in a preset range, checking and outputting models. The invention respectively processes one-dimension diagram and two-dimension diagram, and uses the effective diffusion length according to actual diagrams, to reduce calibration error and improve calibration accuracy.

The invention relates to a method and a system for predicting surface laser damage performance of an optical element. The method comprises the steps of: selecting a standard optical element; acquiringabsorptive defect distribution characteristics of the standard optical element to obtain defect densities of different absorption levels; acquiring damage performance, wherein the damage performancecomprises damage thresholds and damage densities; determining the defect density with the highest correlation with the damage performance in the defect densities of different absorption levels of thestandard optical element by adopting a Spearman correlation analysis method, so as to obtain the defect density corresponding to each damage performance, and establishing a correlation curve between the damage performance and the corresponding defect density to serve as a standard curve; and acquiring the defect density of a to-be-detected optical element, and determining the damage performance ofthe to-be-detected optical element according to the standard curve. According to the method and the system for predicting the surface laser damage performance of the optical element, the evaluation precision of the damage performance of the optical element can be improved without damaging the optical element.

Systems, computer-readable instructions, and methods for storing products are disclosed. For example, the system may include modular shelving units that include a shelf which is placeable on a rack, the shelf including a platform, the shelf having a weight sensor below the platform, the platform is configured to support N number of holders, each of the N holders configured to store products, each shelf further having N−1 optical sensors below the N−1 holders when the N−1 holders are supported by the platform and N−1 windows above the N−1 optical sensors, the N−1 optical sensors being in proximity of the N−1 holders, respectively, wherein each holder includes an opening, wherein when a holder is on the shelf, the opening is capable of being aligned with an optical sensor, the shelf further having a processing circuit coupled to the N−1 optical sensors and the weight sensor.

A method of calibrating an optical detector includes installing a calibration system within at least one sensing volume of the optical detector, filling a chamber of the calibration system with a material to achieve a known obscuration, and measuring an obscuration of the material within the chamber.

A method of calibrating an optical detector includes affixing a calibration material to a first surface of the optical detector and calibrating one or more parameters of the optical detector using the calibration material.

In general the present disclosure is directed to a temperature control device, e.g., a TEC, that includes a top plate with at least first and second contact pads to allow for a soldering process to attach optical components to the first contact pad without causing one or more layers of the second contact pad to reflow and solidify with an uneven mounting surface. Thus, optical components such as a focus lens can be mounted to the second contact pad via, for instance, thermal epoxy. This avoids the necessity of a submount to protect the focus lens from the relatively high heat introduced during a soldering process as well as maintain the flatness of the second contact pad within tolerance so that the mounted focus lens optically aligns by virtue of its physical location / orientation with other associated optical components coupled to the first contact pad, e.g., a laser diode.

The invention discloses automatic optical lens alignment equipment which comprises a case. Supporting pad bases are installed on the left side and the right side of the bottom of the case, a lens grabbing mechanism is installed at the position, close to the top, in the case, a lens alignment mechanism is installed below the lens grabbing mechanism, and a lens barrel is arranged below the lens alignment mechanism. The lens barrel is fixed through a lens barrel fixator, the lens grabbing mechanism and the lens alignment mechanism are both in control connection with a single-chip microcomputer installed in the case, the lens barrel fixator comprises a center supporting rod, and a plurality of supporting blocks are evenly arranged on the outer side of the center supporting rod. An inclined supporting rod is hinged between one end, facing one side of the center supporting rod, of each supporting block and the center supporting rod. According to the automatic optical lens alignment equipment, the diameter of the lens barrel is measured through a laser, accordingly, the center of the lens barrel of an optical lens is aligned, the alignment precision is higher when the lens is assembled and aligned, and compared with traditional CCD camera shooting identification, the alignment precision is not influenced by the imaging quality of a CCD camera.

The invention discloses a quasi-optical system for terahertz beam shaping. The system comprises a flat semiconductor crystal, a super-hemispherical silicon lens and an aspheric collimating lens, wherein one surface of the super-hemisphere silicon lens is a super-hemisphere surface, and the other surface of the super-hemisphere silicon lens is a plane; the flat semiconductor crystal is fixed on theplane side of the super-hemisphere silicon lens; and the aspheric collimating lens is arranged on the super-hemisphere side of the super-hemisphere silicon lens. The flat semiconductor crystal generates collimated terahertz waves under the excitation of femtosecond laser pulses and direct-current bias voltage; and the generated terahertz waves directly enter the super-hemispherical silicon lens and the aspheric collimating lens, and parallel terahertz wave beams are output. The system can also comprise an aspheric focusing lens and a focal plane; and the parallel terahertz wave beams enter the aspheric focusing lens and reach the position of the test focal plane to generate focused terahertz waves. The influence of water vapor absorption is reduced, the system resolution is improved, theproportion of total reflection beams is reduced, the maximum transmittance reaches 72%, meanwhile, the optical path of an air optical path is reduced, and the terahertz signal quality is improved.

An optics interface method of optics instrument and external optical source and the device. Based on the theory of two points locating one straight line, promote a simplifying method of aligning method of the optics instrument and the external optical source. It requires that the optical path and the retardation between the external optical source and the two locating points are as long as possible, and the place of the receiving screen does not change, that is, the minor change of the emitting direction of the external optical source can bring about apparent movement of the facula of receiving screen, so as to improve the direction adjusting precision of the external optical source. The invention uses lens moving along the precision guide way to reduce the space of the device, and is convenient for the switch between the working state of the optics instrument and the state of the aligning adjustment of the external optical source. The strong point of this invention is that it can accurately align the external optical source to the internal optical path of the optics instrument, and the adjustment is convenient and the cost is low.

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.

A method of calibrating an optical sensor may include acquiring a first characteristic for an external light source through a detector of an optical sensor while an internal light source of the optical sensor is turned off; driving the internal light source; acquiring a second characteristic for the internal light source and the external light source through the detector, based on driving the internal light source; and acquiring a reference characteristic of the internal light source, for calculation of an absorbance of an object, based on the first characteristic and the second characteristic.

The invention discloses a terahertz Luneberg lens multi-beam antenna, and relates to the field of terahertz antennae. The terahertz Luneberg lens multi-beam antenna comprises a metal branch lens and an antenna feed source, wherein the metal branch lens comprises a plurality of metal columns with different heights and diameters, and different effective dielectric constant distributions can be realized by adjusting the sizes of the metal columns, so that the dielectric constant distribution required by the Luneberg lens is discretely approached, flat plates on the upper and lower sides of the lens expand a certain field angle at the tail end to increase the directivity of the antenna, any active device is not needed, and one-dimensional beam scanning can be realized only by switching the ports. According to the quasi-optical working mode of the antenna, the direction of the antenna wave beam is only related to the position of the feed source, compared with a phased-array antenna, the antenna does not have the problems of gain reduction, sidelobe rise, grating lobe occurrence and the like during wave beam scanning, and the gain of the feed source can be increased in a wide working frequency band.

an optical sensing system comprising: a processing circuit; a first calibration optical sensor, comprising a first sensor edge and a second sensor edge opposite to the first sensor edge; and a second calibration optical sensor, away from the first calibration optical sensor for a first distance, comprising a third sensor edge and a fourth sensor edge opposite to the third sensor edge. The processing circuit determines a target object has moved for a target distance if an object pattern of the target object moves from a first location in the first calibration sensor to a second location in the second calibration sensor, wherein a first sum of a second distance which is between the first location and the first sensor edge and a third distance between the second location and the third sensor edge equals to a reference distance.