2279 results about "Collimator" patented technology

The invention relates to a laser inter-satellite link test method, system and device and a computer readable medium, which are used for performing butt joint test on a laser inter-satellite link by using a laser inter-satellite link test system. The laser inter-satellite link test system comprises any one of a laser high-speed processor, a first laser terminal, a second laser terminal, a first collimator, a second collimator, a monitoring camera, a micro-vibration simulation galvanometer and a rotary table. The method comprises the following steps: carrying out a signal light capturing and tracking test; carrying out beacon light capturing and tracking and communication distance measurement test; carrying out a beacon light leapfrogging capturing and tracking test; carrying out a broken chain recapture test; performing a long-time link establishment assessment test; therefore, any one of the capture time, the link establishment time, the coherent fine tracking precision, the error rate, the ranging random error, the link reestablishment time, the link establishment interruption times and the recapture success times of the laser inter-satellite link is obtained. According to the invention, the matching performance and reliability of working processes among single machines can be effectively verified, and system risks can be effectively prevented.

The invention belongs to the technical field of retina imaging and fundus three-dimensional reconstruction, and particularly relates to a color three-dimensional fundus imager optical system. Comprising a large eye objective lens, a dichroscope, a hollow reflector, a focusing lens, a spectroscope, a retina lens, a retina imaging chip, a fixation lens, a sighting mark lamp, an illumination lens, an annular light source, a pupil lens, a pupil imaging chip, an infrared lens, an infrared dodging lens, an infrared light source, a scanning lens, a three-dimensional galvanometer, a collimator, a coupler, a frequency sweeping light source and a dispersion compensator. A polarization controller, a coupler and a photoelectric detector. The system is mainly composed of a visible light imaging light path, an infrared imaging light path and a laser imaging light path, the visible light imaging light path is used for shooting color fundus two-dimensional images, the infrared imaging light path is used for real-time positioning and focusing of human eye pupils, and the laser imaging light path is used for three-dimensional tomography of retinas. The objective of the invention is to solve the problem that existing medical equipment cannot acquire fundus color three-dimensional images.

The invention discloses a PCB (printed circuit board) back drilling stub length detection device and method, and belongs to the technical field of PCB detection, the PCB back drilling stub length detection device comprises a broadband light source, the output end of the broadband light source is connected with an optical fiber coupler, and one end, deviating from the broadband light source, of the optical fiber coupler is respectively connected with a first optical fiber collimator and a second optical fiber collimator; the first optical fiber collimator is provided with a lens and a reflector on an optical transmission path; the second optical fiber collimator is provided with a galvanometer on a light transmission path, and a scanning lens is arranged in the light emitting direction of the galvanometer; and the optical fiber coupler is also connected with a spectrograph. On the basis of the low-coherence light interference principle, the PCB back drilling stub length detection device is designed, the output power and the output bandwidth of a broadband light source are correspondingly adjusted, the insertion loss of an optical fiber coupler is controlled, the collection rate of a spectrograph is adjusted, finally, the axial resolution reaches 5 micrometers, the transverse resolution reaches 10 micrometers, and the requirements that the diameter is smaller than 0.1 mm, and the detection precision is larger than 0.1 mm can be met. And detecting the stub length of the deep micropore with the depth of less than 10mm.

The present invention discloses an in-situ detection device and method for the surface shape of an optical-mechanical component, which belongs to the field of optical precision detection technology, and aims to solve the problem in the prior art that there is a lack of in-situ monitoring and detection of surface shape distortion during the adjustment process of an optical-mechanical component. The laser light generated by the laser in the device is incident on the optical-mechanical component to be measured after passing through a beam isolator, a beam splitter prism, and a collimator A in sequence, and is reflected. The reflected light of the optical-mechanical component to be measured is incident on the beam splitter prism after passing through the collimator A and is reflected. The reflected light of the beam splitter prism is incident on a CCD camera after passing through a perforated light screen, a collimator B, and a phase plate. The CCD camera is connected to a computer system, and the light spot diagram recorded by the CCD camera will be input into the computer system for in-situ detection of the surface shape. The method modulates the reflected light of the sample to be measured by a phase plate, and uses a phase reconstruction algorithm based on light field diffraction iteration to realize sample surface shape reconstruction. It has the advantages of high measurement accuracy, no need for a reference plane, and strong vibration resistance.

The invention discloses a lunar resource in-situ exploration-while-drilling device and method. The lunar resource in-situ exploration-while-drilling device is composed of a spiral drilling tool, an illumination light source module, a polarization spectrum detection module and a dual-channel spectrum measurement module. The drilling tool drill rod is of a hollow structure. Light emitted by the illumination light source module is collimated and depolarized to form unpolarized parallel light to irradiate lunar soil on the side wall of the drill hole, and the polarization spectrum measurement probe collects reflected light of the lunar soil; the reflected light is collimated by a front collimator objective of the probe and then sequentially passes through a spectrum modulation unit consisting of an achromatic 1 / 4 wave plate, a multi-stage wave plate, a beam splitter prism and two polaroids of which the light transmission directions are vertical to each other, and two orthogonal light beams are formed, so that polarization information of the reflected light is modulated in a spectrum dimension; demodulating the modulated spectrum to obtain the spectrum and polarization information of the lunar soil reflected light; and the resource distribution and content and the physical characteristics of the original lunar soil are inversed by using the polarization spectrum characteristics of the lunar soil. According to the invention, in-situ exploration of lunar subsurface depth profile mineral resources can be realized.

The invention discloses a wireless optical communication alignment system and a capture alignment method thereof, and relates to the technical field of optical communication, and the method comprises the steps: a three-dimensional holder carries out the coarse alignment of an optical path between a transmitting end and a receiving end according to the direction of beacon light; an alignment device located at the top of the three-dimensional holder carries out fine alignment on the light path; the alignment device comprises a two-dimensional alignment structure, a control circuit and a device shell. The control circuit captures a light intensity feedback value of the light intensity sensor of the two-dimensional alignment structure, and adjusts an azimuth angle and a pitch angle of the optical fiber collimator of the two-dimensional alignment structure according to the light intensity feedback value so as to adjust lens orientations of the transmitting end and the receiving end; the device shell provides a supporting platform for the two-dimensional alignment structure and the control circuit and is connected with the three-dimensional holder. Coarse alignment and fine alignment are combined, accurate angle adjustment is achieved through light intensity feedback, efficient alignment of light paths of the transmitting end and the receiving end is ensured, meanwhile, the device shell provides stable support and connection, and the stability and reliability of the alignment process are guaranteed.

The invention relates to the technical field of wafer warpage and curvature detection, in particular to a wafer warpage and curvature detection system and a detection method thereof, and the detection system comprises a laser, a beam expander, a diaphragm, a beam splitter prism, a collimating mirror, a reference mirror, an imaging lens, a CCD and a computer, the light beam is reflected by the sample to be measured and then returns along the same path to interfere with the reference light so as to generate three groups of interference fringes, and the three groups of interference fringes pass through the imaging lens, the CCD and the computer and then are calculated so as to obtain the warping degree and the bending degree of the sample to be measured. According to the invention, the multi-surface interference fringe pattern of the double-sided polished sample to be measured is acquired by using the wavelength-adjustable Hunfizeau interferometer, and the warping degree and the bending degree of the sample to be measured are obtained through calculation, so that the problem of mapping errors caused by measuring the surface shape by using two interferometers or overturning the measured surface shape is solved; therefore, the detection steps of the warping degree and the bending degree of the wafer can be simplified, and the precision of the detection result is improved.

The invention relates to the technical field of laser processing, in particular to a laser light path rapid switching method and related equipment. The laser light path fast switching method comprises the steps that a single laser emits original laser, the original laser passes through a laser collimator or directly enters a multi-channel reflecting mirror set to adjust a transmission path, a beam expander is selectively started for beam expanding according to the machining requirement, a preliminary shaping light beam is formed, and a basic light path matched with a follow-up optical device is constructed. According to the invention, through the integrated driving mechanism and grating ruler full-closed-loop control rapid switching device, the mobile carrier pre-installed with multiple DOEs is driven to realize accurate cutting-in of a target light spot element in a light path, and the problem of rapid adaptation of multiple light spot patterns in a single laser system is solved.

The invention discloses a double-comb non-cooperative target ranging system based on single photon detection, which is characterized in that an optical pulse output by a first optical frequency comb is divided into two paths of light through a first beam splitter, the first path of light is combined with one of two paths of light divided by a second optical frequency comb through a second beam splitter, and the combined light is transmitted to a first nonlinear frequency up-conversion module; a sum frequency light pulse in the wave band of 780 nm is generated and detected by a base avalanche diode photoelectric detector, and then a time-dependent single photon counter is triggered to start counting; the second path of light is output to a beam expanding collimator through the circulator and irradiates a target to be measured through spatial propagation, the beam expanding collimator collects diffuse reflection light and returns the diffuse reflection light to a third port of the circulator along the original path, and the diffuse reflection light and the other path of light split by the second optical frequency comb through the second beam splitter are combined and transmitted to a second nonlinear frequency up-conversion module; the up-conversion light after sum frequency conversion passes through the optical filter group and then is recorded by a stop end of the single photon counting module, multi-cycle accumulative statistics is carried out by the time correlation single photon counter, and finally a photon counting waveform is reconstructed and the flight time difference of the to-be-measured target is calculated by the computer.

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 calibration device with a spectrum self-calibration function and a high-resolution spectrum calibration method thereof. The device comprises a narrow-band light source, a broadband light source, an optical fiber isolator, a coupler, an interference system, a multi-way switch, an FP (Fabry-Perot) cavity, a collimator, an orthogonal dispersion system and a computer, wherein the orthogonal dispersion system consists of a cylindrical lens, a reflector, a virtual phase array, a grating, a focusing lens and an industrial camera; according to the device, different light source paths are gated, FP cavity modulation and orthogonal dispersion system light splitting are utilized, and an industrial camera is combined to receive light signals. According to the method, the mapping relation between pixels and wavelengths can be established, the two-dimensional spectrum is compressed into the one-dimensional calibration spectrum through light intensity modulation and normalization processing, the calibration process of the orthogonal dispersion system is simplified, and the measurement precision is improved; and system drift can be compensated in real time through self-checking calibration, and the reliability of a measurement result is ensured, so that accurate calibration and measurement of a high-resolution spectrum can be realized.

A piston and cylinder unit of a working machine, for example a wheel loader, excavator, tipper or crane serves to steer, pivot, lift or provide other movements of the working machine or of a tool. The piston and cylinder unit includes a cylinder, a piston being arranged in the cylinder to be axially movable along a longitudinal center axis and a piston position detection unit. The cylinder includes a mounting bore extending radially in the cylinder. The piston position detection unit is arranged in the mounting bore and detects the axial position of the piston in the cylinder by high frequency technology. The piston position detection unit includes an antenna for sending and receiving high frequency signals. A collimator is arranged in the beam path of the antenna. The antenna has a main sense of direction of radiation extending parallel to the longitudinal center axis.

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 MeV-level wide-energy-spectrum gamma energy selection amplification imaging system and a design method thereof. The technical problem that an existing gamma ray beam energy selection imaging device is low in detection efficiency is solved. The imaging system comprises a radiation conversion unit, an energy selection beam amplification unit and an imaging unit, the radiation conversion unit is a radiation conversion target and is used for converting gamma rays from a to-be-detected target into electron beams; the energy selection beam amplification unit comprises a collimator, a first magnet and a second magnet which are sequentially arranged along the transmission path of the electron beam; the collimator is used for limiting the collection angle of the electron beam; the parameter specifications of the first magnet and the second magnet are different, the first magnet and the second magnet are respectively used for changing a transmission path of an electron beam through a magnetic field, and a first beam limiting device is arranged between the first magnet and the second magnet and is used for removing electrons which can be dispersed in the y direction and are large in angle; and a second beam limiting device is arranged between the imaging unit and the second magnet and is used for removing electrons which can be dispersed in the x direction and have large angles.

The invention discloses a relation calibration method and device of a two-axis turntable and a collimator, a medium and a product, and relates to the technical field of data processing. The method comprises the following steps: when the theodolite and the collimator are in a light focusing condition, acquiring first angle data of rotation of the two-axis turntable and second angle data of rotation of the theodolite; constructing a coordinate system conversion model according to the first angle data and the second angle data; based on the first angle data, the second angle data and the coordinate system conversion model, determining a plurality of conversion matrixes among the two-axis turntable coordinate system, the theodolite coordinate system of the theodolite and the collimator coordinate system; and determining the conversion relation between the two-axis turntable and the collimator according to the plurality of conversion matrixes. According to the invention, the two-axis turntable in the ground detection simulation system can be accurately aligned and calibrated with the collimator, reliable guarantee is provided for research, development and testing of the laser communication terminal, and the accuracy and reliability of satellite communication simulation are improved.

The invention discloses a laser scanning device based on light spot switching, additive manufacturing equipment and a method of the laser scanning device. The laser scanning device comprises a laser device, a collimator and a galvanometer system, wherein the power of the laser device can be adjusted within the range of 5w-30000w; an optical diffraction device is arranged between the collimator and the galvanometer system and used for achieving rapid switching of a first light spot and a second light spot so as to print a workpiece, the first light spot is a Gaussian light spot and used for printing the outer contour of the workpiece, the corresponding printing layer thickness is h1, the second light spot is a shaping light spot and used for printing a filling area of the workpiece, and the corresponding printing layer thickness is h2; the switching speed of the first light spot and the second light spot does not exceed 200 milliseconds. The optical diffraction device is arranged between the collimator and the galvanometer, rapid switching between the high-power shaping light spot and the low-power Gaussian light spot is achieved, the Gaussian light spot is adopted for printing the small-layer-thickness contour, the shaping light spot is adopted for printing the large-layer-thickness filling, and therefore on the premise that the printing quality of a workpiece is guaranteed, the production efficiency is improved. And the printing efficiency is greatly improved.

The invention discloses a quick mounting method for an assembly type prefabricated column. The quick mounting method comprises the steps that S1, a working face is prepared; s2, component hoisting: when the prefabricated column is adjusted to be 200-300mm away from the ground by a crane, trial hoisting is performed, a component hoisting appliance is adjusted to be horizontal, and after each hoisting point is uniformly stressed, the corresponding component is hoisted to a construction position; s3, a collimator is installed and calibrated, the collimator is adsorbed to the prefabricated column reinforced concrete structural surface, a laser horizontal positioning module on the collimator is started, and the laser horizontal emission state is automatically calibrated through an electronic level meter; s4, pre-positioning the prefabricated part, hanging the prefabricated column to a position 200mm away from the mounting surface, pausing the prefabricated column, and preliminarily adjusting the direction of the column body on the basis of the set mounting reference control line, so that the mounting reference control line is preliminarily aligned with the laser beam; and S5, accurately positioning and adjusting the prefabricated part, observing the overlap ratio of the mounting reference control line and the laser beam by an operator, finely adjusting the spatial position of the prefabricated column, and mounting and fixing when the mounting reference control line completely coincides with the laser beam.

The invention relates to the technical field of radiation therapy, in particular to a boron neutron capture therapy beam shaping device and a boron neutron capture therapy system. The beam shaping device for boron neutron capture therapy is used for beam shaping of a DT neutron tube generator. The interior of the beam shaping device is provided with a particle beam channel, and the particle beam channel is used for generating an initial neutron source through an incident proton beam. The beam shaping device comprises a value-added layer, a moderator, a filter layer, a reflecting layer, a collimator and a shielding layer, wherein the value-added layer, the moderator, the filter layer and the collimator are sequentially arranged from a target material to an outlet. And the axes of the particle beam channel, the value-added layer, the moderator and the collimator coincide. According to the beam shaping device, 14Mev high-energy neutrons from the DT neutron tube generator are shaped into hot / slow neutron beams meeting the BNCT treatment requirements, and impurities of fast neutrons and gamma rays are reduced to the maximum extent, so that the dosage precision and biological selectivity of treatment are effectively improved.

The present invention belongs to the technical field of optical analysis instruments. Disclosed are a non-transparent thin film element measuring system, and a measuring method, solving the problems in the prior art that the thickness measurement precision of non-transparent thin films is insufficient and non-transparent thin films are prone to damage. The non-transparent thin film element measuring system comprises a light-emitting assembly, optical fibers, an optical fiber collimator, a measuring mechanism, a fiber optic spectrometer and a terminal device; the light-emitting assembly and the fiber optic spectrometer are connected to the optical fiber collimator by means of the optical fibers; during use, a light source emitted by the light-emitting assembly is transmitted to the optical fiber collimator by means of an optical fiber, the optical fiber collimator forms parallel light that illuminates the measuring mechanism on which a non-transparent thin film is placed, a Fabry-Perot chamber having a light interference function is formed in the measuring mechanism and reflects the light to the optical fiber collimator, the optical fiber collimator transmits same to the fiber optic spectrometer by means of the optical fibers, and the terminal device completes measurement of the thickness of the non-transparent thin film through calculation. The present invention does not damage non-transparent thin films, and can satisfy the thickness measurement precision.

The utility model discloses a collimator for optical instrument parallelism adjustment, which relates to the technical field of optical instrument detection equipment and comprises a laser generator and a cylinder fixedly connected to the output end of the laser generator, a frame is slidably connected to the inner arc wall of the cylinder, and a convex lens is coaxially arranged on the inner side of the frame. The outer arc wall of the convex lens is slidably connected with four fixing seats which are distributed in an annular array, and the ends, away from the convex lens, of the fixing seats are rotatably connected to the inner arc wall of the frame body; according to the utility model, the deflection angle of the lens is adjusted through the plurality of first adjusting knobs, the direction of a light beam output by the laser generator after being refracted by the lens can be finely adjusted, so that the light beam can more accurately point to a target position, and the second adjusting knob enables the lens to axially move so as to adjust the focusing position of the light beam. It is ensured that the light beam forms a clear focus at the target position, meanwhile, the adjustable lens can eliminate light beam deflection caused by manufacturing or assembling errors, and therefore the adjustment and calibration precision is improved.

The present invention relates to a radiation generating system (1) comprising a radiation unit (2), wherein the radiation unit (2) comprises a light source (3), a first collimator (4), and an optical arrangement (5). The light source (3) is configured to generate light source radiation (100) 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. The first collimator (4) is configured in a light receiving relationship with the light source (3), wherein the first collimator (4) is configured to collimate the light source radiation (100) into collimated light source radiation (101) having an initial spatial light distribution (ISLD). The optical arrangement (5) is arranged downstream of the first collimator (4) and comprises an optical filter (6) and a diffuser (7). The optical filter (6) has a higher transmission for the first wavelength λ1 than for the second wavelength Xi when irradiated under a predefined angle 0. The first wavelength Xi is selected from the range of 190-230 nm and the second wavelength Xi is selected from the range of 100-190 nm and / or 230-300 nm. The optical filter (6) is configured to filter at least part of the collimated light source radiation (101) into filtered radiation (102) comprising at least portion of the light source radiation (100) of the first wavelength Xi having a first spatial light distribution (SLD1) and at least portion of the light source radiation (100) of the second wavelength λ2 having a second spatial light distribution (SLD2) different from the first spatial light distribution (SLD1). The diffuser (7) is configured downstream of the optical filter (6). The diffuser (7) is configured to diffuse at least part of the filtered radiation (102) into diffused radiation (103) comprising at least a portion of the light source radiation (100) of the first wavelength λ1 having a third spatial light distribution (SLD3) and at least portion of the light source radiation (100) of the second wavelength λ2 having a fourth spatial light distribution (SLD4) different from the second spatial light distribution (SLD2).

The embodiment of the invention provides a laser terminal optical axis calibration method, system and device and a medium, and relates to the technical field of test.The method comprises the steps that the first mass center position of a first light spot generated in a monitoring camera is obtained, and the first light spot is generated after laser emitted by a laser marker is reflected by a first reference prism; the monitoring camera and the laser marker are located on the displacement table, the first reference prism is installed on a laser terminal to be measured, the laser terminal is installed on the rotary table, and the displacement table is located between the laser terminal and the collimator; the rotary table is controlled to rotate until the first mass center position coincides with the position of the preset tracking point, optical axis calibration of the laser terminal and the collimator is completed, and parallel light emitted by the collimator is reflected to the mass center position of a light spot formed in the monitoring camera through the first reference prism. By applying the scheme provided by the embodiment of the invention, the labor cost required for calibrating the optical axis of the laser terminal can be reduced.

The invention provides a composite collimator and a control method thereof, a radiotherapy system and a dose delivery method thereof, and relates to the technical field of radiotherapy, and the composite collimator comprises a grating and a diaphragm which are sequentially arranged in the direction of a beam center axis, the plurality of blades move to form a grating channel through which a radiation beam can pass; the diaphragm is provided with a collimation channel, and the diaphragm can move relative to a beam center axis; when the diaphragm moves to enable the collimation channel to be located at the central axis of the beam, the radiation beam forms a focusing radiation field in a target area through the grating channel and the collimation channel; and when the diaphragm moves to enable the collimation channel to deviate from the beam center axis, the radiation beam forms a conformal radiation field in the target area through the grating channel. Through switching between the conformal radiation field and the focusing radiation field, a flexible irradiation scheme is provided, so that the dose distribution effect can be improved, and the radiotherapy effect is improved.

An inspection portal includes a first x-ray source configured to emit a first beam, a first backscatter detector configured to detect backscatter from the first beam, a second x-ray source configured to emit a second beam, a second backscatter detector configured to detect backscatter from the second beam, and at least one first collimator and at least one second collimator, each oriented to detect backscatter from the associated beam and to block scatter from the other beam. The first and second backscatter detectors are configured to weight signals acquired using each of their detector element based on the first and second beams. The first backscatter detector is configured to use signal processing techniques to mitigate crosstalk due to scatter from the second beam, and the second backscatter detector is configured to use the signal processing techniques to mitigate crosstalk due to scatter from the first beam.

The invention belongs to an optical system, and provides a moving target measurement optical system and a measurement method, aiming at the technical problems that when the track of an aerial target is measured at present, only intersection measurement can be carried out, and distance measurement cannot be carried out by a single theodolite, so that measurement is inconvenient and calculation is complex. Comprising a main optical system, a laser ranging receiving correction lens group, a visible light collimating lens group, a visible light imaging lens group and a medium-wave infrared projection lens group. A laser ranging receiving light path, visible light measurement and infrared measurement common aperture structural form is adopted, single-station simultaneous angle measurement, ranging and temperature distribution measurement are achieved, and then single-station moving target track measurement is completed. Visible light imaging, medium-wave infrared capture measurement and laser ranging receiving share a primary mirror and a secondary mirror of the Cassegrain mirror group, high-resolution imaging, high-precision angle measurement and laser ranging are realized without parallax and optical axis sharing, and the requirements of long-focus high-definition imaging, long-distance high-precision angle measurement and long-distance ranging can be met at the same time.

Disclosed is a linear array scanning Brillouin scattering elastic imaging device. In the device, a signal generating system consists of a narrow linewidth continuous wave laser, a half-wave plate, a beam expander, a Y-direction scanning galvanometer, a microlens array, a pinhole array filter, a first plano-convex lens, a polarization beam splitter, a quarter-wave plate and a microscope objective. A signal receiving system consists of a microscope objective, a quarter-wave plate, a polarization beam splitter and an eight-channel optical collimator array. Each channel of an eight-channel spectrometer consists of an optical collimator, a convex lens, a scanning Fabry-Perot interferometer, a photomultiplier tube and an eight-channel photon collection card.

A small animal imaging and radiotherapy (RT) irradiator device uses a circular array x-ray source to scan an anatomy of an animal, delivers conventional and ultra-high dose rate of radiation to the treatment target. The multipixel x-ray source includes a ring of focal spots capable of irradiating x-ray beams from around fifty beam angles. The x-ray beams are collimated with a collimator designed in treatment planning.

An imaging device is provided. The imaging device includes an X-ray tube, a collimator, and a detector. The collimator includes an opening, wherein the collimator has a width in a first direction and a length in a second direction. The opening has an opening width in the width direction of the collimator, and an opening at at least one end of the collimator in the second direction has an opening width smaller than that of an opening within the middle section of the collimator.

Systems, devices and methods for measuring surface roughness and surface shape of an optical element using a dual-mode interferometer are disclosed. The devices implement optical filters, with a compact form, that allows measurement of both surface characteristics without rearranging the system components. One example interferometric system includes a laser light source and a low coherence light source that alternatively provide light to a collimator, followed by a polarizer, and a polarizing beam splitter. The system further includes two optical filters, a quarter waveplate, two objectives and a reference optical component. Each light source produces a set of interferograms, where one set of interferograms is used to measure the surface shape and another set of interferograms is used to measure the surface roughness of the optical component.

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.