39 results about "Autocollimation" patented technology

A method for aligning two surveying instruments in a common space in a process that uses an autocollimation of a collimated light beam transmitted by a first surveying instrument and reflected by a second surveying instrument. In the alignment process, the first surveying instrument may emit a collimated light beam towards the second the surveying instrument and receive a reflection of the collimated light beam from the second surveying instrument in an autocollimator. The reflection may be generated for example by a mirror at the second surveying instrument. When the light beam is reflected such that autocollimation of the collimated light beam is achieved at the first surveying instrument, the first and second surveying instruments are in a predetermined positional relation with respect to one another. With a known predetermined positional relation between the reflecting mirror and the line of sight of the second surveying instrument, measurements by both surveying instruments can be made in a common coordinate system.

The invention discloses a low-repetition-frequency laser pointing stability improving device and method, and belongs to the field of lasers. According to the invention, the seed laser pulse of the MHz magnitude is used as the reference light to adjust the directivity of the light path, and compared with the main laser repetition frequency of the Hz magnitude, the sampling frequency of the subsequent directivity adjustment is greatly improved, so that the laser auto-collimation precision is improved. The use of the first shutter, the second shutter and the third shutter ensures the safety of the first detector and the second detector in the transmission process of the main laser when the energy difference between the main laser and the reference light is 9 orders of magnitude. The first detector images the first grating of the compressor to ensure that the positions of laser entering the compressor are the same, so that the consistency of laser pulse width and directivity can be ensured to a great extent, the second detector images the acting target to ensure that the acting positions are the same, and the stability of a subsequent radiation source is ensured. The laser directivity correction method is applied to laser directivity correction of hundred TW-level and PW-level lasers.

This invention proposes a micro-nano arc-scale three-dimensional angle inspection device and method. The device comprises a ribbed worktable, a worktable shaft, a worktable support, a drive unit, a base, a plane mirror, an autocollimator, a drive module circuit board, a main control module circuit board, a display input module circuit board, and a turntable. The method uses the drive unit to induce a three-dimensional angle deflection in the worktable, employs two sets of autocollimation systems to measure this deflection, and establishes closed-loop feedback control for the worktable. Because the two angle measurement devices are orthogonally arranged, the three-dimensional angle deflection of the worktable can be measured. Using an autocollimation system as the angle measurement device greatly improves the angle measurement resolution. The combined drive method of a lead screw and piezoelectric ceramic further enhances the resolution of the worktable angle, thus solving the problems of small-angle inspection instruments being unable to perform three-dimensional angle inspection and having low angle resolution.

The invention relates to the technical field of precision optical detection, and discloses a laser auto-collimation peak alignment angle measuring method and device, and the device comprises a point light source, a first spectroscope located in the emergent direction of the point light source, and a collimating mirror and a measured prism element which are sequentially arranged along the reflection direction of the first spectroscope; the rotating table bears the prism element to be measured, and the rotating table is connected with an angle measuring module for measuring the rotating angle of the prism element; the detection unit comprises a slit plate and a photoelectric detector which are sequentially arranged in the direction opposite to the reflection direction of the first spectroscope, and the slit plate is provided with a slit; and the controller is respectively connected with the point light source, the rotary table, the angle measurement module and the photoelectric detector, and finally high-resolution and high-precision measurement and the like of the included angle of the measured prism element are realized.

The utility model relates to an automatic focusing three-dimensional five-axis laser cutting head which comprises an optical fiber QBH automatic collimation assembly, a C-axis rotating assembly, an A-axis rotating assembly, a light path reflection assembly and a cutting assembly, and has the advantages that the structure is compact, focusing is accurate, the optical fiber QBH automatic collimation assembly and an automatic focusing lens assembly are adopted, the center position and the focal length of a light beam can be accurately adjusted, and the cutting efficiency is improved. Stable and consistent cutting quality is guaranteed, and cutting precision is improved. The protection assembly is internally provided with pressurized gas to prevent dust pollution, and the service life of the optical element is prolonged; the anti-collision assembly is in magnetic attraction connection with an annular magnet through a contact type sensor, the cutting head is effectively protected against collision damage, the equipment reliability is improved, and the service life is prolonged. The laser machining device is high in adaptability, can adapt to various types of lasers, meets different machining requirements, has good universality and flexibility, and expands the application range. The automatic focusing function reduces manual intervention, accelerates the cutting speed, improves the production efficiency and reduces the production cost.

This invention discloses a three-degree-of-freedom autocollimation angle measurement device and method based on a crosshair reticle, comprising a probe system, a target mirror system, and a calculation system. The probe system emits a collimated beam containing crosshair image information into the target mirror system. The target mirror system separates the collimated beam containing crosshair image information into two reflected beams parallel to the optical axis, each reflecting beam containing crosshair image information. The probe system also receives the two reflected beams parallel to the optical axis and images the crosshair images corresponding to the two reflected beams. The calculation system calculates the pitch and yaw angles of the target based on the initial and current coordinates of the crosshair image corresponding to one reflected beam parallel to the optical axis, and calculates the roll angle of the target based on the initial and current tilt angles of the crosshair image corresponding to the other reflected beam parallel to the optical axis. This invention enables rapid and high-precision three-degree-of-freedom angle measurement of distant targets.

The invention discloses a large-scale complex optical-mechanical system integrated space pose positioning method and system, which are used for solving the problems of poor initial positioning precision and low efficiency caused by a built-in optical element and no exposed measurement basis in a modularized optical system. The method comprises the following steps: measuring a reference surface of an optical machine main body through a laser tracker to establish a global space coordinate system, and aiming through at least two auto-collimation theodolites and establishing a global angle coordinate system according to a global accurate measurement mirror; the method comprises the following steps: arranging a plurality of cooperative target seats and accurate measurement mirrors on a target module, and respectively acquiring actual spatial positions and angle postures of the target module under a global coordinate system; and comparing the actually measured pose with the theoretically designed pose, and manually adjusting the target module by using a six-degree-of-freedom adjusting mechanism until the pose deviation meets the tolerance requirement, thereby finally realizing rapid and accurate initial positioning. The method does not depend on an exposed optical surface of the module, and the installation and adjustment efficiency and reliability are remarkably improved.

The invention relates to an optical calibration system (30), comprising: - a support (32), - an imaging device (34) mounted on the support (32), the imaging device (34) comprising: • a camera comprising an image generation unit and an objective, • a collimation unit suitable to emit a collimated beam convoying an image of a so-called collimation object, the imaging device (34) being selectively switchable between two modes of operation among: • an autocollimation mode in which both the image generation unit and the collimation unit are activated, and • an imagery mode in which only the image generation unit is activated.

The application discloses a fiber type horizontal angle indicating device based on a self-collimation principle and a method thereof, and relates to the technical field of horizontal angle indication.The device comprises a light source, a fiber weight module, a light intensity receiving module and a frame.The light source emits a space light which is coupled into the fiber weight module.The fiber weight module converts the direction of the incident light into a vertical downward direction and emits the light to a measured object.The measured object reversely couples the incident light into the fiber weight module.The fiber weight module emits the incident light to the light intensity receiving module.The light intensity receiving module converts the incident light into an electric signal.The frame is used for suspending the fiber weight module.The application is suitable for the installation and debugging process of high-end manufacturing equipment, measuring instruments and scientific test equipment, and provides high-sensitivity horizontal angle indication for the adjustment requirement of the spatial posture of a sensitive element and the high-precision level of the ground.

The invention discloses an optical instrument mirror surface perpendicularity detection method and device, and belongs to the technical field of optical instrument detection.The method comprises the steps that S1, a first detection unit and a second detection unit are coaxially arranged on an optical platform in the correlation direction, and the zero points of the first detection unit and the zero points of the second detection unit are calibrated through mutual correlation of the first detection unit and the second detection unit; s2, an optical instrument to be detected is arranged on the optical platform and located between the first detection unit and the second detection unit, parallel light is emitted to the mirror surface of the optical instrument through the first detection unit and the second detection unit in sequence, and a first pitch angle and a second pitch angle of the mirror surface are recorded through an auto-collimation method; and S3, calculating the perpendicularity deviation of the mirror surface relative to the reference surface according to the first pitch angle and the second pitch angle. According to the invention, errors caused by the precision of the optical platform and the precision of the 90-degree reference mirror can be eliminated, and random errors caused by measurement are reduced, so that the precision of a detection result is improved, and errors of the detection result are reduced.

The application discloses a ground space pointing precision testing method for a large-defocus two-dimensional tracking and detecting system, and solves the technical problem that the existing space pointing precision testing method for a two-dimensional tracking and detecting system is not applicable to the space pointing precision testing of a large-defocus two-dimensional tracking and detecting system, and comprises the following steps: adjusting the azimuth angle and the elevation angle of the large-defocus two-dimensional tracking and detecting system to be 0 degrees, aiming at the large-defocus two-dimensional tracking and detecting system by using a first autocollimation theodolite, adjusting the position of a second autocollimation theodolite, aiming at the large-defocus two-dimensional tracking and detecting system, then mutually aiming at each other by the first autocollimation theodolite and the second autocollimation theodolite, and finally calculating the space pointing azimuth error and the elevation error of the large-defocus two-dimensional tracking and detecting system according to the measured azimuth angle and the elevation angle.

Three-waveband off-axis reflective optical system with field of view switching and focusing detection function. It belongs to the field of optoelectronic technology. Multi-waveband common aperture imaging is realized by adopting off-axis two-mirror optical path form, imaging information can be obtained uninterruptedly day and night, laser emission and receiving ability is considered, and functions such as positioning and aiming, laser guiding are possessed. Large and small field of view switching imaging is realized by cutting in and out of the secondary mirror, and the ability of fast searching in large field of view range and accurate identification and tracking in small field of view range is possessed. Optical system autocollimation focusing is realized by switching the position of focusing detection mirror and setting focusing detection system, and clear imaging under different atmospheric pressure, temperature change and photographic distance is ensured, and the system is suitable for accurate aiming and detection of targets in various complex and harsh working conditions. The all-reflective optical system has no chromatic aberration, no obstruction, compact structure and high system integration, and meets the diversified functional requirements of optoelectronic system.

This invention belongs to the field of three-degree-of-freedom pose measurement technology, and relates to a single-beam three-degree-of-freedom pose measurement method and device based on heterodyne interferometry and self-collimation. The measurement method includes the following steps: Step 1: A laser beam is split into two beams with a certain frequency difference; Step 2: In the self-collimation module, the laser is split into a first reference beam and a first beam; the first beam is modulated, reflected, and then modulated again to split into a first measurement beam and a second beam; the second beam is modulated to a first photoelectric detection module; Step 3: In the heterodyne interferometry optical path, the laser is split into a second reference beam and a third beam; the third beam is modulated, reflected, and then split into a second measurement beam and a fourth beam; the two reference beams are merged to form a first interference beam, and the two measurement beams are merged to form a second interference beam; Step 4: A circuit module acquires the angle and displacement; The measurement device includes an optomechanical module, a target under test, and a circuit module. Using the above scheme, displacement and angle are measured simultaneously.

This invention discloses a comprehensive information processing board for angle calibration of an optoelectronic tracking device, comprising: an information acquisition module that acquires two-dimensional coordinate data of the laser spot on the target surface through a laser information acquisition camera; a data communication module with a multi-interface design, connecting to the camera, inertial measurement unit, autocollimator, optoelectronic tracking device, and power supply unit respectively, to realize real-time acquisition and transmission of multi-source data; a synchronization module that ensures system time synchronization based on a high-precision clock source; a data calculation module that constructs a three-dimensional spatial pointing model by fusing laser coordinates, inertial navigation attitude, autocollimation optical axis data, and optoelectronic tracking device miss distance information, and accurately calculates the azimuth / pitch angle deviation between the multispectral optical axis of the optoelectronic tracking device and the reference axis; and a power monitoring module equipped with dual-redundant detection circuits to monitor the power supply status in real time. This invention effectively improves the optical axis calibration accuracy and system reliability of the optoelectronic tracking device through multi-source data fusion and high-precision calculation.

The application discloses a method for measuring super-large curvature radius, and relates to the field of optical measurement, which comprises the following steps: placing two autocollimators in parallel on one side of an optical element to be measured, calibrating the parallel state by using optical flat crystals; then placing the autocollimators near the curved surface to be measured, synchronously adjusting the pitch angle and position to make the light spots on the same CCD axis; calculating the centroid offset of the reflected light spots, and reducing the noise influence by combining with a denoising algorithm; finally, calculating the curvature radius according to the distance between the two autocollimators and the centroid offset distance of the light spots; the method is compatible with concave-convex mirror measurement, does not need to replace equipment or adjust the optical path, has a simple optical path structure, and the algorithm is easy to realize; the method does not depend on a high-precision optical platform, can be applied in an optical workshop, compared with the traditional autocollimation method, does not need a large-stroke displacement table, and can realize the measurement of the super-large curvature radius only by fine adjustment, so that the operation is simplified, the repeatability is good, and the precision is high.

The utility model provides a kind of experimental device for measuring Young's modulus of metal wire by screw micrometer, including measuring frame, light lever device and observation frame;Measuring frame includes measuring support, bearing table, first chuck, second chuck, loading device and screw micrometer;Bearing table is fixedly connected on measuring support, and vertical direction through-hole is provided on bearing table;Screw micrometer is fixed in bearing table end, and the micrometer screw rod area part of bearing table opposite screw micrometer is hollowed out, and the lower end of flat plate is supported by the micrometer screw rod of screw micrometer;Light lever device forefoot is placed on flat plate, and hind leg is placed on the top of second chuck;Observation frame is used to observe the angle change of light lever device.The utility model has the characteristics that compared with conventional experimental instrument, it avoids the error generated by large space distance measurement, and uses autocollimation principle to ensure measurement accuracy, but light path adjustment is simple.

The application provides a self-collimation detection system and method for conjugate positions of a digital single-optical-path or multi-optical-path optical system, which comprises a light source, a scale plate, an imaging receiving device and a display, a beam splitter, a collimating objective assembly, a mirror, a displacement detection device and a focusing mechanism, and the detection system composed of the basic components can accurately measure the conjugate positions of the single-optical-path or multi-optical-path optical system. In specific embodiments, the optical path layout of the optical system is flexibly set according to different applications, the basic principle is unchanged, the system has strong versatility, and is suitable for high-precision batch detection of the conjugate positions of the optical system.

The invention relates to a dynamic digital zooming and ray beam center positioning method in X-ray equipment. The X-ray equipment comprises a visual acquisition module, a depth sensing module, an X-ray emission module, an image receiving module and a control module. Firstly, a mapping relation between a ray beam propagation path and a visual coordinate system is established through geometric calibration; synchronously acquiring an RGB color video stream and three-dimensional depth data of the to-be-shot part; an artificial intelligence model is called to recognize an exposure area in combination with field professional rules, and a ray beam theoretical center is determined; calculating an SID value based on the mapping relation and the three-dimensional depth data, estimating the actual center of the ray beam and obtaining an offset; according to the offset, enabling the center of the RGB color video stream to be aligned with the center of the ray beam through digital zooming processing or an automatic collimation mechanism; and outputting a correction result in real time, and dynamically responding to the shooting state change. According to the invention, through multi-source data fusion and dynamic correction, the problem of ray beam offset under different shooting conditions is solved, and the positioning precision of the exposure area is improved.

A precision dual-beam parallelism detection device is disclosed for detecting the parallelism of a first test beam and a second test beam arranged parallel to each other with a distance L between them. The device includes an autocollimation angle measurement unit comprising a focusing lens and a photoelectric position detector located on the same optical axis. The photosensitive surface of the photoelectric position detector is located at the focal plane of the focusing lens. The focusing lens and the photoelectric position detector are mounted on a multi-degree-of-freedom attitude adjustment mechanism. The beam steering unit is a cornerstone prism used to deflect either the first or second test beam by 180° before it enters the focusing lens. The cornerstone prism has a first mounting point and a second mounting point, the center of which is located on the optical axis of the focusing lens. This invention features a simple optical path, wide applicability, and utilizes differential measurement to eliminate zero-position errors, achieving high-precision dual-beam parallelism measurement.

The invention relates to the technical field of precision optical detection, and discloses a laser auto-collimation differential alignment angle measuring method and device. The device comprises a point light source, a first spectroscope located in the emergent direction of the point light source, and a collimating mirror and a measured prism element which are sequentially arranged along the reflection direction of the first spectroscope, the rotating table bears the prism element to be measured and is connected with an angle measuring module for measuring the rotating angle of the prism element; the detection unit comprises a slit plate and a photoelectric detector which are sequentially arranged in the direction opposite to the reflection direction of the first spectroscope, the photoelectric detector is an array type detector or a quadrant type detector which are symmetrically distributed, and the slit plate is provided with a first slit and a second slit which are arranged in parallel; according to the invention, high-resolution alignment of the surface of the measured prism element is realized, the influence of the element tower difference on the measurement result is inhibited, and the measurement precision of the plane included angle of the measured prism element is improved.

An apparatus and method for determining a collimation configuration in an imaging system are provided. Image data acquired by a two-dimensional (2D) camera of a camera system is accessed. The 2D camera has a field of view for capturing a scene containing an object. Image data is obtained prior to an imaging examination of an object. A machine learning algorithm is applied to the image data to determine geometry parameters of the collimated target light field expected to be projected onto the object. Geometry parameters of the collimated light field are provided for guiding or controlling the adjustment of the geometry of the collimator.

The application provides a satellite single machine attitude automatic measurement device and a measurement method. The device comprises: a satellite automatic transfer positioning system for providing a satellite positioning reference; a multi-vision system for realizing mechanical arm hand-eye calibration, satellite pose positioning and cube mirror pose detection; a double mechanical arm measurement system for carrying and driving a autocollimation system to a measurement position; an autocollimation system for completing cube mirror collimation measurement; a fixed reference system for establishing a unified reference coordinate system and unifying measurement data; a cube mirror positioning tool for assisting in cube mirror pose identification; a multi-vision system acquires positioning information, combined with path planning, and the double mechanical arm drives the autocollimation system to move according to the planned trajectory, realizing the automation of the cube mirror collimation measurement. The application realizes full-process automatic measurement by multi-vision and double mechanical arm cooperation, special tooling, double-mode positioning and optimal path planning, and shortens the measurement time.

The application belongs to the field of optical measurement technology, and discloses a kind of infrared optical material refractive index temperature coefficient measuring device, comprising: light source, monochromator, oscillation slit, off-axis parabolic mirror, precision temperature control system, precision angle measuring system, detector, signal processing unit and computer;Optical material sample is placed in precision temperature control system and heated, the outgoing light of light source is aimed at monochromator, oscillation slit, collimated by off-axis parabolic mirror, enters sample after being transmitted by half-transmission half-reflection mirror, the reflected light of sample back surface is sequentially reflected by half-transmission half-reflection mirror, reflected mirror, focuses after being reflected by axis parabolic mirror and enters detector, is converted into electric signal, is transmitted to computer by signal processing unit, obtains the corresponding autocollimation angle value of sample at the temperature, changes temperature and repeats the above steps, obtains the refractive index temperature coefficient of the optical material sample.The application has the advantages of high measurement precision, high temperature, wide wavelength coverage range and the like.

The invention relates to the technical field of precision optical measurement, and discloses a double-frequency heterodyne three-axis grating ruler. The device mainly comprises a double-frequency orthogonal polarization light source, a plane mirror, a combined grating, a two-dimensional reflection grating, a one-dimensional grating, a polaroid, a quarter-wave plate, a half-wave plate, a heterodyne photoelectric conversion unit and a signal acquisition and processing device. The double-frequency light source generates S and P polarized light which are different in frequency and vertical in polarization, the S and P polarized light enters the combined grating partition through the plane mirror to be diffracted, and X, Y and Z three-axis displacement signals are synchronously acquired in cooperation with a Littrow angle auto-collimation light path of the two-dimensional reflection grating. Y-axis displacement is obtained by heterodyne interference signals formed by beam combination of light returned by the two-dimensional reflection grating in the position space of the one-dimensional grating, and X-axis displacement and Z-axis displacement are obtained by joint calculation of interference signals diffracted and separated by the combined grating. The system is symmetrical in light path, compact in structure, quasi-common in light path, capable of effectively restraining environment temperature excursion and mechanical vibration, and suitable for multi-degree-of-freedom high-precision positioning measurement.

This invention discloses a device and method for calibrating the focal plane assembly position of an off-axis reflective collimator, solving the problem that existing technologies cannot achieve accurate calibration of the focal plane position of an off-axis reflective collimator. The calibration device includes an autocollimation component, an angle measuring component, a translation stage calibration component, and a digital microscopy system. The autocollimation component and the angle measuring component work together to calibrate the actual central field of view of the off-axis reflective collimator; the translation stage calibration component is used to calibrate the movement direction of the translation stage; the autocollimation component, the angle measuring component, and the digital microscopy system work together to calibrate the position of the target plate, ensuring that it is parallel to the focal plane of the off-axis reflective collimator and that its center coincides with the actual central field of view of the off-axis reflective collimator. This calibration device can quickly and optimally adjust the principal ray direction of the central field of view of the off-axis reflective collimator and the relative position between the focal plane and the target plate and translation stage, thereby improving calibration accuracy.

The invention discloses a high-precision full-field inclination calibration system and method for shearing speckle interference. The system comprises an integrated composite calibration target mirror, a two-dimensional piezoelectric deflection driving module, a photoelectric auto-collimation measurement module and a control and data processing unit, the measuring surface of the composite calibration target mirror is divided into a central rough scattering surface and an annular smooth reflecting surface. In the calibration process, the piezoelectric deflection driving module is used for inducing the target mirror to generate high-precision two-dimensional inclination deformation, the photoelectric auto-collimation measurement module is used for obtaining the absolute inclination angle of the target mirror in real time through the smooth reflecting surface to serve as a reference, and meanwhile the shearing speckle interferometer to be calibrated is used for collecting interference data of the rough scattering surface. And the control unit is used for carrying out full-field comparison and calculation on the two data to realize error correction. Physical space alignment of benchmark measurement and speckle measurement is achieved through the double-function area target mirror, the problems that traditional calibration precision is low, and full-field coverage cannot be achieved are solved, and the device has the advantages of being compact in structure, high in repeatability and high in adaptability.

This invention relates to the field of precision angle measurement and error correction technology, specifically to a 360° precision angle correction device and method based on autocollimation tracking compensation. The device includes a mounting and fixing assembly for mounting and fixing the object to be corrected; a rotary correction assembly whose main housing is connected to the rotation output end of the object to be corrected; a reflector connected to the rotation output end of the rotary correction assembly; an autocollimator, configured in conjunction with the reflector, for acquiring the deflection angle value of the reflector; and a host computer connected to the object to be corrected, the rotary correction assembly, and the autocollimator. The rotary correction assembly includes a reference encoder. This device, through the rotary correction assembly with its built-in high-precision reference encoder, provides real-time reverse compensation for the motion angle of the object to be corrected, ensuring that the reflector mounted on the rotary correction assembly remains aligned with the autocollimator in space, indirectly achieving precise measurement and correction data generation of the angle error within a 360° full-circle range of the object to be corrected.

The invention relates to the technical field of vehicle sensors, in particular to an alignment device for a vehicle, which comprises a plurality of sensor apertures arranged at different positions of the vehicle and used for acquiring information of targets around the vehicle; the plurality of micro inertial sensors are respectively attached to each sensor aperture and the vehicle body, and the micro inertial sensors are used for sensing the angular rotation or acceleration of the vehicle; the processor is integrated with a Kalman filter, the processor is electrically connected with the micro inertial sensor, and the processor is further electrically connected with a CAN bus of the vehicle; the method does not need to depend on complex external optical equipment such as an automatic collimator and a laser aiming tool, and high equipment investment in the production stage is avoided; an external alignment program does not need to be executed again after the sensor is maintained / replaced, the later operation and maintenance cost and the operation complexity are reduced, and meanwhile the hidden misalignment problem caused by vehicle abrasion is solved.

The invention discloses a surgical robot calibration device and method, and relates to the field of photoelectric measurement. A confocal auto-collimation microscope is driven based on a three-coordinate displacement table, a spherical reflector die body is installed at the tail end of a surgical robot, vertex space coordinates and transformed coordinates of three concave spherical reflectors of the die body are measured through the coarse calibration process and the fine calibration process, a rotation matrix and a translation vector are calculated through a rigid body transformation algorithm, and the surgical robot is obtained. An Euler angle is extracted from the rotation matrix, and six-degree-of-freedom pose calibration of the tail end of the robot is completed; the confocal auto-collimation microscope comprises a first objective lens and a second objective lens, and two CCD sensors are combined to realize rapid positioning and precise measurement at the same time. The invention further provides a simplified implementation mode, and alignment is completed by visually observing a light reflecting signal of the small hole. The device and the method have the advantages of high measurement precision, high stability, low cost and the like, are suitable for factory leaving or regular static calibration of the surgical robot, and improve the absolute positioning precision of the tail end and the system reliability.

This application relates to a high-information-entropy bar-coded slit determination method and a high-precision autocollimator based on the slit and its stripe signal processing algorithm. The determination method includes: obtaining multiple initial light-transmitting slit patterns according to a preset bar coding method; using a preset information entropy determination model to obtain the uncertainty, redundancy, and randomness of each initial light-transmitting slit pattern; obtaining the information entropy corresponding to each initial light-transmitting slit pattern based on the uncertainty, redundancy, and randomness; and using the initial light-transmitting slit pattern with the highest information entropy as the target light-transmitting slit pattern of the autocollimator. Thus, the image of the target light-transmitting slit output by the autocollimator can be processed using a cross-correlation template matching method and surface fitting to obtain more accurate sub-pixel-level image positioning accuracy, and then combined with the autocollimation measurement formula to obtain a high-precision angle deflection.