916 results about "Collimator" patented technology

The invention relates to the technical field of laser ranging, in particular to a double-optical-comb hybrid ranging device which comprises a signal detection optical path system and a signal demodulation optical path system. Wherein the signal detection optical path system comprises a first optical frequency comb, a first optical isolator, a first optical collimator, a first beam splitter prism, a reference mirror, a Faraday rotator, a convergence mirror and a target reflector; the signal demodulation optical path system comprises a second optical frequency comb, a second optical isolator, a second optical collimator, a half-wave plate, a second beam splitter prism, a third beam splitter prism, a first polarization controller, a first photoelectric detector, a reflector, a polarization beam splitter prism, a second polarization controller and a second photoelectric detector. A third polarization controller; and a third photoelectric detector. According to the invention, three ranging technologies of asynchronous optical sampling ranging, multi-heterodyne interference ranging and synthetic wavelength ranging are fused, and the problem that a large ranging range and high ranging precision cannot be simultaneously considered in the ranging process is solved.

The invention discloses a parallel imaging OCT (Optical Coherence Tomography) system based on a metasurface area array, which relates to the technical field of medical instruments, is small in size and can realize intraocular single-shot area array imaging and a three-dimensional position depth perception function by using metasurface and optical coherence tomography imaging information in a sample tissue with a limited size. According to the technical scheme, a light beam emitted by a laser is divided into two paths through a beam splitter, and the two paths enter a sample arm module and a reference arm module respectively; the sample arm module is a probe and comprises a multi-core optical fiber and a first metasurface; the reference arm module comprises a collimator, a motor and a right-angle reflector; the probe enters a sample tissue, a light beam is focused on the sample tissue and then is backscattered, the backscattered light beam reversely passes through the first metasurface, the multi-core optical fiber, the beam splitter, the second metasurface, the third lens, the grating and the focusing lens and then forms a spectral line beam on the CCD sensor, and the computer reads a signal from the CCD sensor and performs three-dimensional reconstruction imaging on the sample tissue.

The invention discloses a spiral resonance photoacoustic cell and an operation method, the spiral resonance photoacoustic cell comprises a gas chamber straight tube, a spiral tube, an optical fiber collimator and an optical fiber F-P sonic sensor, the two ends of the gas chamber straight tube are open, the two ends of the spiral tube are communicated with the gas chamber straight tube, an acoustic resonance point is formed at the center of the spiral tube, and the optical fiber F-P sonic sensor is arranged in the central area of the spiral tube; and the optical fiber collimator is arranged at one end of the air chamber straight pipe. The spiral pipe is wound outside the air chamber straight pipe, the spiral pipe is communicated with the air chamber straight pipe, the structural design of the spiral pipe enables the spiral pipe to form acoustic resonance at a specific frequency, and the optical fiber F-P sonic sensor obtains a photoacoustic signal; compared with a conventional resonance photoacoustic cell, the physical volume of the resonance photoacoustic cell is greatly compressed, and the system integration level is effectively improved. More importantly, under the condition that a compact appearance similar to that of a non-resonant photoacoustic cell is kept, the device amplifies the photoacoustic signal intensity by several times through an acoustic resonance effect, and the detection sensitivity and the signal-to-noise ratio of the system are remarkably improved.

The invention relates to the technical field of optical communication equipment testing, in particular to an integrated optical module multi-parameter testing system and method.The method comprises the steps that a multi-channel parallel testing unit synchronously collects light spot morphology, divergence angles, insertion loss and return loss space and transmission characteristic parameters through a transmission light path and a reflection light path; the parameter collaborative analysis module performs nonlinear correlation analysis and dynamic performance threshold evaluation based on a cross-dimension correlation model; the intelligent calibration engine dynamically adjusts the test benchmark and compensation parameters according to the environment temperature and the equipment aging attenuation model; the fault diagnosis and prediction unit identifies potential defect types of the collimator, constructs a performance degradation prediction model in combination with a working state and environmental stress, and predicts a performance evolution trend according to test data; and the test report generation module automatically generates a standardized and customized dual-mode test report, a quality grade label and a performance optimization suggestion according to the prediction result and the diagnosis conclusion. Therefore, the problems of poor test precision, low test efficiency and the like in the prior art are solved.

The invention relates to the technical field of optical detection, and particularly provides a mirror surface detection method for a large-aperture spliced telescope, which comprises the following steps of: emitting light from a focus position by using a light source, reflecting the light through a mirror surface of the large-aperture spliced telescope to enter a discrete lens arranged at the rear end, and splitting the light by using a spectroscope to obtain a split light beam; the first light beam enters the camera to obtain interference fringes of the splicing seams, the second light beam enters the optical switch to carry out aperture coding, and the mirror surface precision of the large-aperture spliced telescope can be determined according to the code of each splicing seam and the confocal and co-phase information of the sub-reflectors on the two sides of the splicing seam. According to the invention, splicing seam detection is carried out through focus reverse auto-collimation, the problem that an oversized collimator is needed traditionally is avoided, point-by-point detection is carried out on the sub-reflectors according to the splicing seam, and confocal and co-phase detection of the adjacent sub-reflectors is realized according to interference fringes.

The invention discloses an ultra-wide thin-wall tunnel roof deformation monitoring device based on laser ranging, and relates to the technical field of laser measurement, the ultra-wide thin-wall tunnel roof deformation monitoring device comprises an industrial camera and a mounting seat, a laser is fixedly mounted on the mounting seat, a mounting bracket is mounted at the bottom of the mounting seat, and a protective shell is fixedly mounted on the mounting seat. A light beam collimator is fixedly installed on the laser device, and a beam splitting assembly is fixedly installed in the protective shell and used for equally dividing a light source emitted by the laser device into two laser beams. The tunnel section deformation monitoring method has the advantages that high-precision and high-efficiency deformation monitoring can be performed on the tunnel section, the problems of time desynchrony and optical distortion existing in a traditional method are effectively solved, and meanwhile, the adaptability and data reliability in a severe environment are remarkably improved; and reliable technical means and equipment support are provided for structural health assessment of the ultra-wide thin-wall tunnel top arch.

The invention discloses an electrically-controlled variable optical attenuator based on a multistage wedge-shaped liquid crystal box and an attenuation control method, the attenuator comprises a laser, the laser provides an incident light signal, the divergent incident light signal is converted into a collimated parallel light beam through a collimator, the collimated parallel light beam is subjected to deflection modulation through a multistage wedge-shaped liquid crystal box module, and the modulated light beam is converted into a modulated light beam; the multi-channel liquid crystal controller is coupled to the output optical fiber through the optical fiber coupler, and generates and outputs driving voltage signals capable of being independently adjusted to the N-stage wedge-shaped liquid crystal box module, so that each wedge-shaped liquid crystal box in the multi-stage wedge-shaped liquid crystal box module is independently controlled; the control method comprises the steps of receiving a target instruction, querying a system-level relationship, distributing a deflection task, querying a device-level relationship, outputting a driving signal and performing closed-loop feedback correction. According to the invention, a large attenuation range is obtained, and at the same time, millisecond-level and even sub-millisecond-level rapid response is realized; the precision, the linearity and the usability of attenuation control are improved, and the control complexity is reduced.

The invention relates to the technical field of optical fiber gas sensing, and provides an optical fiber photoacoustic sensor based on a nested cantilever beam structure and a sensing system.The optical fiber photoacoustic sensor comprises an optical fiber collimator, a shell, a cantilever beam diaphragm and a ceramic contact pin; the optical fiber collimator is inserted into the shell from one side of the shell; the ceramic pin is inserted into the shell from the bottom of the shell; an air chamber is arranged in the shell, and an air inlet and an air outlet which are communicated with the air chamber are reserved in the shell; a cantilever beam diaphragm is arranged on the shell; a plurality of layers of nested cantilever beams are arranged on the cantilever beam membrane; the lengths and the widths of the cantilever beams are sequentially reduced from outside to inside; and the resonant frequencies of the cantilever beams are different. According to the invention, multiple gases can be detected in the same equipment at the same time, the detection efficiency is improved, and the equipment volume is reduced.

A penta prism collimator having four freeform surfaces that fold the optical path of light received from a microdisplay collimates light for coupling to a waveguide. In some embodiments, the freeform surfaces are toroidal surfaces made from a single injection-molded element, such as a single piece of plastic. The freeform surfaces collimate the light at a variety of distances from an input pupil of a waveguide, allowing for more freedom of placement within a frame of a WHUD.

The invention discloses a multi-wavelength laser collimator based on radial shearing. The multi-wavelength laser collimator comprises a near-field reference, a telescope objective combination, a bifocal objective and an image detector which are sequentially arranged along a light path. Aberration-free imaging of near-field light beams is achieved through a bifocal objective lens, and meanwhile far-field pointing is detected through coaxial shearing interference generated by means of amplitude light splitting. A single non-mobile sampling detection light path and a single detection sensor are used to realize simultaneous acquisition of near-field position information and far-field pointing information of a laser beam; the light spot position deviation and the fringe translation amount are analyzed through a computer, and high-precision collimation is achieved through a feedback control system. And the detection of the angle direction of the laser beams with various wavelengths can be realized by using a radial shearing interference technology. The device breaks through the limitation of traditional double-optical-path collimation, has the characteristics of simple structure, strong anti-interference performance, multi-wavelength applicability and the like, remarkably improves the collimation precision, reduces the cost, and has important application value in the field of laser precision collimation.

The invention discloses a space light photoelectric composite slip ring which comprises a bearing, a rotor assembly and a stator assembly. The rotor assembly comprises a photoelectric slip ring main shaft frame, a conductive slip ring loop and an optical fiber collimator; the conductive slip ring loop is separated by a conductive slip ring insulating ring and is arranged at the periphery of the photoelectric slip ring main shaft frame; the photoelectric slip ring main shaft frame is connected with the inner ring of the bearing through a bearing inner pressing ring; the stator assembly comprises a photoelectric slip ring main shaft seat, a conductive slip ring brush holder and an eccentric gland. The conductive slip ring brush holder is connected with the photoelectric slip ring spindle seat; the eccentric gland is connected with a photoelectric slip ring spindle seat, and an unequal-thickness adjusting ring is arranged between the eccentric gland and the photoelectric slip ring spindle seat; the optical fiber collimator is mounted on the eccentric gland; the photoelectric slip ring spindle seat is connected with the outer ring of the bearing through an eccentric gland. An optical transmission system and an electric transmission system are integrated into the same shaft system, the purposes of miniaturization and light weight are achieved, the cost is controlled, precision and reliability are high, and the optical transmission system has good environmental applicability and long service life.

The invention provides a gas saturation absorption optical path structure based on dual optical path enhancement, which belongs to the field of laser optical path design and comprises an optical fiber circulator, a gas absorption chamber and an optical fiber reflector. A first port of the optical fiber circulator is connected with a laser output optical fiber, a second port of the optical fiber circulator is connected with an input collimator of the gas absorption chamber, and a third port of the optical fiber circulator is connected with a detector and is used for providing frequency reference for gas absorption; and the optical fiber reflector is connected with the output end of the gas absorption chamber. According to the invention, the physical contradiction between the air chamber size and the optical path gain is broken through, and a compact frequency stabilization system with miniaturization and high stability is realized.

A wearable display system includes one or more emissive micro-displays, e.g., micro-LED displays. The micro-displays may be monochrome micro-displays or full-color micro-displays. The micro-displays may include arrays of light emitters. Light collimators may be utilized to narrow the angular emission profile of light emitted by the light emitters. Where a plurality of emissive micro-displays is utilized, the micro-displays may be positioned at different sides of an optical combiner, e.g., an X-cube prism which receives light rays from different micro-displays and outputs the light rays from the same face of the cube. The optical combiner directs the light to projection optics, which outputs the light to an eyepiece that relays the light to a user's eye. The eyepiece may output the light to the user's eye with different amounts of wavefront divergence, to place virtual content on different depth planes.

The invention discloses a nondestructive inspection intelligent detection system and method for a mining steel rope core conveying belt structure, particularly relates to the field of X-ray detection, and is used for solving the problem that the defect recognition reliability is insufficient due to serious secondary scattering in the X-ray detection process of an existing mining steel rope core conveying belt under the online operation condition. Spatial modeling and time sequence prediction are performed on secondary scattering by constructing an X-ray scanning protocol self-adaptive configuration mechanism based on conveyor belt working condition characteristics, and the focal spot size, the opening degree of an anti-scattering grid and the beam outlet fan-shaped angle of a collimator are dynamically adjusted in a linkage manner according to a prediction result, so that active suppression and geometric constraint control of scattering are realized. Meanwhile, scanning data obtained in the detection process is used for conducting consistency correction on the scattering distribution time sequence prediction model, defect positioning and confidence degree evaluation are completed in combination with the arrangement characteristics of the steel rope core structure, and therefore high-reliability nondestructive flaw detection of the steel rope core conveying belt structure is achieved in the complex mining environment.

The invention discloses an X-ray tomography in-situ testing device and method suitable for a seawater high-pressure environment. The X-ray tomography in-situ testing device comprises an X-ray source, a collimator, a flat panel detector, a seawater pressure cabin and a seawater pressure control device. During detection, the X-ray source is started, the sample is started to move spirally, the flat panel detector collects projection data, then a cross-sectional image is reconstructed through an existing method, and the X-ray tomography in-situ test of the sample in the seawater high-pressure environment is achieved. In order to solve the problems that a seawater in-situ detection device in the prior art is insufficient in penetrating power, low in resolution ratio, limited in sample movement freedom degree and poor in high-pressure environment adaptability, the invention discloses an X-ray tomography device and method, and in-situ dynamic imaging can be carried out on a large component in a seawater high-pressure environment. In-situ observation of micron-sized damage and defects (100-200 microns) is realized, and meanwhile, an imaging view field is expanded through a multi-degree-of-freedom sample table and a spiral scanning method, so that the detection efficiency is improved.

An optical system for a vehicle headlamp is provided, and includes at least one light source, at least one collimator positioned to receive light from the light source, a cylindrical lens array (CLA) positioned to receive collimated light from at least one collimator, and an irregular freeform cylindrical lens array (IFCLA) positioned to receive light from the CLA. The IFCLA includes an entry lens with numerous entry facets of irregular sizes and an exit lens with numerous exit facets. The irregularly sized entry facets on the entry lens focus light onto the middles of the respective exit facets on the exit lens.

The embodiment of the invention provides a ray beam collimation system, and relates to the technical field of medical equipment. The ray beam collimation system comprises a primary collimator and a multi-leaf collimator. The primary collimator is provided with a through hole with a fixed shape and size, and the through hole is matched with the multi-leaf collimator in shape and size. And the primary collimator is positioned below the ray source and above the multi-leaf collimator. The multi-blade collimator comprises at least two blade groups composed of a plurality of blades, the tail end of each blade is provided with a concave-convex part, the concave-convex part comprises a plurality of first protrusions arranged at intervals in the first direction, a first recess is formed between every two adjacent first protrusions, the at least two blade groups comprise two blades opposite in the second direction, and the first protrusions are arranged at intervals in the first direction. The first protrusion of one of the two opposite blades is used for being connected with the first recess of the other blade in an inserted mode. The ray beam collimation system provided by the embodiment of the invention has the benefits that leakage rays between the tail ends of the blades are shielded, and the irradiation space of a patient in radiotherapy is increased.

The utility model relates to the technical field of optical communication, in particular to a spectrum detector and optical communication equipment. The spectrum detector comprises a double-fiber collimator used for inputting a detection light signal; the beam splitter prism is positioned on the light emitting side of the double-fiber collimator, and the light incident surface of the beam splitter prism is over against the light emitting side of the double-fiber collimator; the fixed spectroscope is positioned on one side, far away from the double-fiber collimator, of the beam splitter prism; the movable spectroscope is positioned on the reflected light emergent side of the beam splitter prism and can be close to or far away from the beam splitter prism along the light emergent direction of the beam splitter prism; the first photoelectric detector is located on the side, away from the movable spectroscope, of the beam splitter prism; the second photoelectric detector is located on the side, away from the beam splitter prism, of the fixed beam splitter. The volume of the spectrum detector can be effectively reduced.

The application discloses an independently replaceable space beam combining semiconductor laser array, which is used for solving the problems of high maintenance cost, high power loss and low space beam combining efficiency of a traditional semiconductor laser bar. The application comprises a carrier, N semiconductor lasers and N sets of beam shaping components which are arranged side by side and independently installed on the carrier. Each semiconductor laser comprises a positive electrode sheet, a semiconductor laser bar, a negative electrode sheet and an insulating pressing sheet which are connected in sequence from bottom to top. The positive electrode sheet is connected in series with the negative electrode sheet in the adjacent semiconductor laser. The light emitting end of each semiconductor laser bar is directed to the corresponding beam shaping component. The connecting end of each positive electrode sheet and negative electrode sheet is located at the back light end of the corresponding semiconductor laser bar. Each set of beam shaping components comprises a fast-axis collimator, a slow-axis collimator and a light path turning piece which are arranged in sequence along the light path. All the light path turning pieces are arranged in parallel, so that the space beam combining of the outgoing light of the semiconductor laser bar in the fast-axis direction is realized.

The invention provides a radiation generating system comprising a radiation unit, wherein the radiation unit comprises a light source, a first collimator, and an optical arrangement, wherein: (a) the light source is configured to generate light source radiation having a first spectral power distribution having an intensity I1,1 at a first wavelength λ1 and an intensity I1,2 at a second wavelength λ2; (b) the first collimator is configured in a light receiving relationship with the light source, wherein the first collimator is configured to collimate the light source radiation into collimated light source radiation; (c) the optical arrangement is configured downstream of the first collimator and is configured to convert the collimated light source radiation into arrangement radiation; wherein the arrangement radiation is collimated relative to the collimated light source radiation; wherein the optical arrangement comprises a second collimator and an optical filter, wherein: (i) the second collimator is configured downstream or upstream of the optical filter; (ii) the optical filter has a higher transmission for the first wavelength λ1 than for the second wavelength λ2 when irradiated under a predefined angle; (iii) the first wavelength λ1 is selected from the range of 190-230 nm and the second wavelength λ2 is selected from the range of 100-190 nm or 230-280 nm; and (iv) the second collimator is at least partly defined by a plurality of light radiation transmissive channels, wherein the radiation transmissive channels are defined by channel walls which comprise a light absorbing material, wherein the light absorbing material is configured to absorb at least part of the collimated light source radiation received by the light absorbing material.

The invention discloses a cone-ball coupled cavity photoacoustic gas sensor for detecting acetylene dissolved in transformer oil, relates to the field of testing or analyzing materials by using an optical means, and solves the problem that miniaturization and high sensitivity of an existing photoacoustic sensor are difficult to consider at the same time. An optical fiber collimator is arranged at one end of the shell, a sonic sensor is arranged at the other end of the shell, a buffer cavity, a first resonant cavity and a second resonant cavity are sequentially arranged in the shell between the optical fiber collimator and the sonic sensor, the end of the optical fiber collimator is located in the buffer cavity, and the center lines of the optical fiber collimator, the buffer cavity, the resonant cavities and the sonic sensor coincide. The buffer cavity is cylindrical, an air inlet and an air outlet are formed in the side wall of the buffer cavity, the first resonant cavity is in a circular truncated cone shape, and the second resonant cavity is in a segment shape. The buffer cavity, the first resonant cavity and the second resonant cavity are coupled to form a cylindrical-conical-spherical coupled cavity, so that limitation and focusing of acoustic energy are realized, and the amplitude of a photoacoustic signal is enhanced.

An assembly includes a collimator having one end associated with a light source, a pillow lens associated with the collimator, and at least one surface that is non-coplanar with the pillow lens. The assembly further includes at least one light pipe, wherein a first portion of light is directed through the pillow lens and a second portion of light exits the pillow lens and is directed by the at least one surface into the at least one light pipe.

The utility model provides a beam expanding magnification detection device of a beam expander. The beam expanding magnification detection device comprises a laser, a collimating lens group, a detection assembly and the beam expander, the laser is used for emitting laser beams; the collimating lens group is used for collimating laser beams emitted by the laser; the detection assembly is used for detecting the collimation degree of the laser beam passing through the collimating lens group and detecting the size of a first light spot of the laser beam passing through the collimating lens group; the beam expander is used for expanding the laser beam collimated by the collimator group; the detection assembly is further used for detecting the collimation degree of the laser beam passing through the beam expander and detecting the size of a second light spot of the laser beam passing through the beam expander. When the beam expanding multiplying power detection device of the beam expanding lens is used, the divergence angle of the laser is adjusted through the collimating lens set, so that the laser beam before entering the beam expanding lens is collimated light, after the collimation degree of the laser beam is measured, the incident light spot and the emergent light spot of the beam expanding lens are measured, and the beam expanding multiplying power of the beam expanding lens is obtained.

The invention discloses a TDI remote sensing camera push-broom direction testing device and method, and solves the technical problems that the economic cost of an existing testing method is very high, and the mechanical structure precision of a two-dimensional turntable is difficult to reach a sub-pixel angular resolution level. The TDI remote sensing camera push-scan direction testing device comprises a collimator, a position and posture adjusting platform, an LED lamp array target, an LED lamp array target driving control device and a time synchronization device. The collimator is provided with an entrance port and an exit port, and the TDI remote sensing camera is installed at the exit port; the position and posture adjusting platform is mounted at the entrance port and comprises a two-dimensional translation table, an electric rotating table and a control device; the LED lamp array target is an LED lamp array with L rows and N columns, N is larger than L, and the LED lamp array target is installed on the electric rotating table and electrically connected with the LED lamp array target driving control device; and the time synchronization device is electrically connected with the LED lamp array target driving control device and the TDI remote sensing camera.

This application relates to a polarization-maintaining isolator and optical device. The polarization-maintaining isolator includes a first collimator, a first polarizer, a Faraday rotator, a second polarizer, and a second collimator arranged sequentially along the optical path. The transmission axis of the first polarizer is along a first target polarization direction; the Faraday rotation angle of the Faraday rotator is equal to the target angle; the transmission axis of the second polarizer is along a second target polarization direction; the first target polarization direction, after being rotated by the target angle, is aligned with the second target polarization direction; and the second target polarization direction, after being rotated by the target angle, is perpendicular to the first target polarization direction. This application simplifies the device structure and reduces the space occupied by the device, achieving a compact design for the optical isolator.

The invention relates to the field of optical devices, and discloses an optical phase shifter and an optical communication terminal, which have the characteristics of integration, simple structure, small size and the like. Wherein the optical phase shifter comprises a coaxial packaging tube shell, a piezoelectric element, a micro reflecting mirror and an optical fiber collimator; the piezoelectric element, the micro reflector and the optical fiber collimator are packaged in the coaxial packaging tube shell along the axis direction of the coaxial packaging tube shell; the piezoelectric element comprises a plurality of stacked piezoelectric material layers; the micro-reflector is fixedly arranged on the piezoelectric element, and the optical fiber collimator is located on the side, away from the piezoelectric element, of the micro-reflector and used for collimating light reflected by the micro-reflector; the piezoelectric element drives the micro-mirror to act relative to the optical fiber collimator so as to adjust the phase shift amount between the reflected light and the incident light of the micro-mirror.

Optoelectronic measuring device (1) for frequency-resolved measurement of the intensity of electromagnetic radiation (10), comprising multiple measurement channels (M1, M2, ..., M m ), wherein a first of the measurement channels (M1) has a first spectral sensitivity and another of the measurement channels (M2, ..., M m ) exhibits another spectral sensitivity that differs from the first spectral sensitivity, and several collimators (K1, K2, ..., K k ) to collimate the electromagnetic radiation (10), wherein - through each of the collimators (K1, K2, ..., K k ) a separate optical path to one or more of the measurement channels (M1, M2, ..., M m ) runs and each of the measurement channels (M1, M2, ..., M m ) is arranged, an intensity of the collimators (K1, K2, ..., K) is arranged, an intensity of the collimators (K1, K2, ..., K k ) collimated electromagnetic radiation (10) to measure, - the optoelectronic measuring device (1) more collimators (K1, K2, ..., K k ) as measuring channels (M1, M2, ..., M m ) includes, and - the optoelectronic measuring device (1) comprises a radiation distribution means (3) which is set up and arranged to direct the electromagnetic radiation (10) onto the collimators (K1, K2, ..., K k ) to distribute, wherein the radiation distribution means (3) comprises a scattering element and / or an optical fiber.

The application discloses a fouling detection device and method based on photoacoustic imaging, wherein the detection device comprises: a sealed cover with at least one transparent surface; a photoacoustic excitation module comprising a laser, an optical fiber bundle and a plurality of micro-fiber collimators; the micro-fiber collimators are integrated in the transparent surface and used for irradiating laser outside the transparent surface to generate a photoacoustic signal; a photoacoustic collection module arranged along the propagation direction of the photoacoustic signal and used for collecting the photoacoustic signal; and a data processing module in communication connection with the photoacoustic collection module and used for calculating the fouling degree outside the transparent surface according to the collected photoacoustic signal. The application adopts nanosecond-level light pulses to improve the detection accuracy; and the laser sequentially traverses the optical fiber, so that the position of fouling can be accurately located, and a reliable basis is provided for fouling removal.

The application belongs to the technical field of optical elements, and discloses a collimating optical fiber connector assembling device and an assembling method, wherein the collimating optical fiber connector assembling device comprises an angle adjusting mechanism, a movement adjusting mechanism and a detection mechanism; the angle adjusting mechanism comprises a rotating assembly, a light receiving plate and a first light source; the rotating assembly comprises a rack and a fixing piece; the fixing piece is used for fixing a collimator; the light receiving plate is provided with a detection area; and the first light source is used for emitting first light to the collimator; the movement adjusting mechanism comprises a fixing seat, a three-dimensional movement assembly and a translation assembly which are connected in sequence; the fixing seat is used for fixing an optical fiber connector; the three-dimensional movement assembly is used for driving the fixing seat to move in space; and the translation assembly is used for driving the fixing seat to move; the detection mechanism comprises a second light source and a light spot instrument; the second light source is used for emitting second light to the optical fiber connector; and the light spot instrument is used for detecting the second light; and the collimating optical fiber connector assembling device can improve assembling quality and assembling precision.

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.