21 results about "Dispersive prism" patented technology

The invention belongs to the field of astronomical telescopes, and particularly relates to a large-aperture spliced telescope adjusting device and method, and the method comprises the steps: starting a light source module, providing a far-field illumination light beam for a spliced primary mirror, and carrying out the confocal adjustment of each sub-mirror through an adjusting mechanism according to the far-field illumination light beam; the light source switching module is used for providing a near-field illumination light beam for the spliced primary mirror, and the near-field illumination light beam is split into two separated sub light beams by the pyramid mirror after penetrating through a splicing seam of the spliced primary mirror; performing dispersion on all the sub-beams through a dispersion prism, and converging the dispersed sub-beams through an achromatic lens to form dispersion stripes; the phase difference of the dispersion fringes is extracted through the camera, and co-phase adjustment is carried out on the sub-mirrors through the adjusting mechanism according to the phase difference of the dispersion fringes. According to the invention, high-precision and high-flux spectral response calibration and co-phase detection of the large-aperture spliced telescope can be realized, so that reliable technical support is provided for construction and operation of a next-generation giant astronomical telescope.

The invention provides a spliced detector flatness large-flux in-situ detection method which comprises the following steps: a light source emits a light beam which is compressed by a cylindrical lens, then is dispersed by a dispersion prism and respectively enters the edges of two adjacent detectors, and the two light beams are reflected by the surfaces of the detectors and then converge to generate dispersion stripes; a fixed difference calibration mode is adopted to calibrate stripe slope singularity caused by edge stripe variation in the dispersion stripe forming process; a band elimination filter is used for generating band elimination of a specific wave band in the dispersion fringes, and the channel spectrum is tested by analyzing the characteristics of the band elimination; the edge position of each detector is finely adjusted by using a dispersion prism, and the edge position of each detector is adjusted through deviation of a pupil position in combination with multi-point light emitted from one side of a wide-angle optical system by using an optical fiber interconnection system. According to the invention, the confocal and co-phase adjustment speed and precision of the spliced detector are greatly improved, and the regulation and control requirements of extremely high information flux and rapid convergence of a large-aperture system are met.

The application discloses a kind of multi-functional gas component concentration monitoring sensors in tunnel and use method, belong to road construction technical field.The application includes white laser emitter, 90° prism, beam splitter, dust cleaner, dispersion prism, 180° prism, dispersion light intensity detector, phase interference range finding device, data processing and sending device and guide rail.The application solves the problem that the function of the existing monitoring sensor in tunnel is single, and the cost is higher and the monitoring efficiency is lower by relying on multiple single-function sensors for monitoring;The application significantly improves the monitoring accuracy of the concentration of various gas components by full-spectrum coverage and double-data comparison to average, breaks through the limitations of traditional single-function sensors, without multiple sensor devices in parallel, significantly reduces the overall operating cost, improves monitoring efficiency.

This invention relates to a pushbroom hyperspectral imaging system for unmanned aerial vehicles (UAVs). A line-plane combined aperture has a slit and a rectangular window. A front-facing lens images the target scene into the rectangular window. The light is collimated by a collimating lens to generate parallel light, then passes through a dispersive prism without dispersion, and finally reaches a focal plane detector through a focusing lens, obtaining a high-resolution image. By comparing the high-resolution images between adjacent frames, pose change information is obtained. The front-facing lens also images the target scene into the slit, collimated by a collimating lens to generate parallel light, then passes through a dispersive prism to cause dispersion, and finally reaches a focal plane detector through a focusing lens, obtaining a multispectral image. The pose change information is used to calibrate the multispectral image of the current frame, and the calibrated images are then stitched together to obtain the final hyperspectral image of the target scene. This invention has a simple and easy-to-use structure, requiring no additional system to assist in image stitching.

This invention relates to a hyperspectral microscopic imaging system, comprising a front imaging module and a hyperspectral back imaging module; the front imaging module is used to collect sample light signals and image a front image beam; the hyperspectral back imaging module is used to disperse the front image beam along the dispersion direction to obtain a spatial spectral image; it includes: a magnifying lens group, a segmentation component, and a dispersive lens group; the front image beam is magnified into a magnified image in the dispersion direction by the magnifying lens group, and the segmentation component is disposed on the image plane of the magnified image; the segmentation component consists of multiple microlens groups arranged side by side along the dispersion direction covering the range of the magnified image; the dispersive lens group includes a collimating lens and a converging lens with the same focal length, the collimating lens and the converging lens forming a relay lens group, and a dispersive prism is disposed between them along the dispersion direction. The hyperspectral microscopic imaging system provided by this invention magnifies the multispectral superposition spatial image obtained by the front imaging module through a magnifying lens group, and then divides and converges it into discrete sub-images through a segmentation component, creating camera detection resources for recording spectral information. The dissociated spectral information is integrated into the spatial information and recorded by the camera to obtain a spatial-spectral image without superposition crosstalk. While achieving spatial-spectral separation, it reduces the distortion of spatial information.

The present invention belongs to the field of laser-related technologies and specifically relates to a method for compensating for dispersion in an acousto-optic deflector based on a dispersive prism assembly. The method comprises: configuring a dispersive prism assembly; constraining the monochromatic laser beam spot emitted from the prism assembly to be circular, calculating the incident angles of the laser beam incident on a first dispersive prism and a second dispersive prism when the negative spatial dispersion generated by the prism assembly is equal to or greater than the positive spatial dispersion of the acousto-optic deflector to be compensated; constraining the incident angles of the laser beam incident on the first and second dispersive prisms and the laser beam emitted from the prism assembly to be perpendicular to the receiving surface of the acousto-optic deflector, determining and adjusting the relative spatial position between the two prisms to achieve spatial dispersion compensation; and calculating and adjusting the distance between the center of the dispersive prism assembly and the center of the acousto-optic deflector when the negative temporal dispersion generated by the prism assembly is equal to or greater than the positive temporal dispersion of the acousto-optic deflector to achieve temporal dispersion compensation. The method of the present invention has a wide range of applications for compensating for spatiotemporal dispersion.

This invention belongs to the field of spectral imaging technology and relates to a multi-slit hyperspectral imaging system and method based on an unmanned aerial vehicle (UAV), comprising: a front objective lens; a multi-slit assembly including multiple slits for sampling the output image plane of the front objective lens using the multiple slits to obtain multiple sampling strips corresponding to the number of slits; a beam splitting imaging assembly, specifically comprising: a collimating lens group for collimating the multiple sampling strips output by the multi-slit assembly; a dispersive prism group including a first Amish prism and a second Amish prism for dispersing and splitting the multiple sampling strips output by the collimating lens group; a focusing lens group for focusing and imaging the multiple dispersive and split sampling strips output by the dispersive prism group to obtain multiple spectral data; a detector for fusing the multiple spectral data with spatial information to obtain multiple spectral images; and a host computer for fusing the multiple spectral images to obtain a target spectral image.

The application discloses a kind of dispersion prism self-rotating direction's calibration method and device, the method includes: the dispersion prism, flat mirror and theodolite are placed according to measurement light path;Adjust the angle of theodolite, precision measuring mirror and flat mirror, make the self-rotating image reflected by flat mirror coincide with the cross wire in theodolite ocular, obtain initial angle;The geometry of the back surface, front surface and front end face of dispersion prism is fitted using multiple points, obtain first spherical surface, second spherical surface and first plane;Second plane where dispersion prism is located is fitted;Based on initial angle, adjust the angle of precision measuring mirror, theodolite and flat mirror, make the self-rotating image returned by flat mirror coincide with the cross wire of theodolite;Measure the target included angle of second plane and fourth plane, and take the target included angle as the final calibration value of the self-rotating direction of dispersion prism.The above-mentioned method introduces the reference of the self-rotating direction of dispersion prism to precision measuring mirror, and improves the calibration accuracy of the self-rotating direction and the assembling efficiency of dispersion prism.

The invention discloses a multifunctional gas component concentration monitoring sensor in a tunnel and a use method, and belongs to the technical field of road construction. The device comprises a white laser transmitter, a 90-degree prism, an optical splitter, a dust cleaner, a dispersion prism, a 180-degree prism, a dispersion light intensity detector, a phase interference distance measuring device, a data processing and transmitting device and a guide rail. The problems that an existing monitoring sensor in a tunnel is single in function, and the cost is high and the monitoring efficiency is low due to the fact that multiple single-function sensors are used for monitoring are solved. The average value is obtained through full-spectrum coverage and dual-data comparison, the monitoring precision of the concentration of multiple gas components is remarkably improved, the limitation of a traditional single-function sensor is broken through, parallel operation of multiple sensor devices is not needed, the overall operation cost is greatly reduced, and the monitoring efficiency is improved.

The present invention provides an interference line spectrum confocal measurement structure, including a line light source, a spectroscopic prism, a dispersion prism, a dispersion objective lens, and a spectrum demodulation module. The line light source is used to generate a strip narrow light source. The spectroscopic prism is a polarization-insensitive prism, which divides the strip light source into two mutually perpendicular light paths. The strip light is then dispersed off-axis by the dispersion prism and axially by the dispersion objective lens, ultimately forming an illumination surface perpendicular to the horizontal. The illumination surfaces of the two light paths interfere with each other and enhance each other, and then return along the symmetrical light path again and enter the spectrum demodulation system. The spectrum demodulation system is composed of the dispersion prism and the dispersion objective lens, and can achieve high linearity in height and position. At the same time, the device can highly compress the detection signal width, thereby improving the measurement accuracy and repeatability of the device.

Device (10) for detecting an object surface (16), comprising: a radiation generating device (17) with at least one radiation source (12), wherein the radiation generating device (17) is configured to emit first electromagnetic radiation with a first wavelength and second electromagnetic radiation with a second wavelength onto a linear measuring field on an object surface (16) with at least one measuring point (32) of the object surface (16) to be measured or an area of ​​the object surface (16) to be measured, which has at least one measuring point (32) to be measured, wherein the radiation generating device (17) is configured to emit no radiation or radiation used for surface detection onto the measuring point (32) to be measured or onto the area of ​​the object surface (16) in a wavelength range between the first wavelength and the second wavelength.such that the first and second wavelengths are different from each other; and a detection device (31) configured to detect at least one first measurement value and at least one second measurement value for each of the measurement points (32) to be measured, wherein the first measurement value is based on radiation with the first wavelength reflected from the object surface (16) and the second measurement value is based on radiation with the second wavelength reflected from the object surface (16), characterized in that the first and second measurement values ​​are each distance values ​​to the object surface (16) and are determined by triangulation, wherein the detection device (31) comprises an optical separating element (36) to divide the radiation reflected from the object surface (16) into a first and a second radiation component (40, 44), wherein the detection device (31) comprises a photosensitive unit (34),wherein the radiation components (40, 44) separated by means of the optical separating element (36) strike the photosensitive unit (34) at offset points of impact (42, 46), wherein the optical separating element (36) is a dispersion prism or an objective of the detection device (31) serves as the optical separating element (36).

The scanning gun comprises a grip and a scanning gun body, the front end of the scanning gun body is provided with a light shield, the rear end of the scanning gun body is provided with a back sealing cover, and a camera module, an emission light source module, a spectrometer module, a power supply module and a communication module are sequentially arranged in the scanning gun body from top to bottom. A main control circuit board is arranged on the inner side of the back sealing cover, the main control circuit board is connected with a camera module, an emission light source module, a spectrograph module, a communication module and a power module, a control unit and a storage backup unit are arranged on the main control circuit board, and the spectrograph module comprises a packaging shell. A light incident plate, a collimating lens, a prism group and an analog-to-digital converter are sequentially arranged in the packaging shell from front to back, the prism group comprises a prism frame, and two incident prisms, two dispersion prisms and two emergent prisms are sequentially arranged on the prism frame from front to back. The resolution and sensitivity of the scanning gun are improved, and spectral data of agricultural products can be directly obtained by scanning the surfaces of the agricultural products.

The invention relates to the technical field of spliced telescopes, in particular to a spliced mirror surface correction method based on spectral dispersion fringes, which comprises the following steps of: filtering one or more specific wavebands of incident light through a band-stop filter, so that a known position spectral band gap appears on the spectrum of the incident light; incident light is utilized to irradiate splicing seams or splicing seam intersection points on the spliced mirror surface, and a dispersion prism is arranged on a reflected light path to perform dispersion on reflected light; interference is carried out on the dispersion light, interference fringes with different wavelengths are expanded in the direction perpendicular to dispersion, and two-dimensional interference fringes of a plurality of sub-mirrors are obtained; the spectral band gaps on the two-dimensional interference fringes of each sub-mirror are aligned by adjusting the poses of the plurality of sub-mirrors, so that the pose correction of the sub-mirror adjacent to the splicing seam or the splicing seam intersection point is completed; and each splicing seam or splicing seam intersection point on the spliced mirror surface is irradiated in sequence, so that the pose correction of all the sub-mirrors can be completed.

The invention discloses a compact interference spectrum measurement device and method based on a catadioptric angle cutter. The device comprises an optical fiber light source, a collimator objective, a composite dispersion prism, the catadioptric angle cutter, a cylindrical lens and a linear array detector which are sequentially arranged in the direction of an optical axis. Incident light is collimated to form parallel light, and the parallel light firstly passes through the composite dispersion prism; the composite dispersion prism is used for dispersing collimated light beams with different wavelengths into light beams with small angle difference, dispersion light enters the catadioptric angle clipper, and in the propagation process, due to different parity of reflection times, shearing inversion is generated in the direction of an emergent wave surface, dispersion directions are symmetrical, and equivalent spatial heterodyne interference modulation is realized; and the two beams of coherent light form interference fringes on the detector after being focused by the cylindrical lens. The device can achieve the spatial heterodyne effect through a single dispersion element, is compact in structure, easy and convenient to debug, high in light energy utilization rate and suitable for point spectrum high-resolution measurement scenes of Raman, fluorescence, absorption and other weak signals.

The invention relates to the technical field of optical imaging, and provides a snapshot type spectral imaging device and method, equipment, a storage medium and a product, and the snapshot type spectral imaging device comprises a detected object; the dispersion prism unit is used for generating spectral dispersion for a detected object to obtain first spectral information; the coding aperture unit is used for carrying out coding modulation on the first spectral information to obtain second spectral information; the dispersion projection unit is used for performing radiation projection on the second spectral information to obtain third spectral information; the dispersion projection unit and the dispersion prism unit are of a symmetrical structure to ensure that aberrations at two ends of the coding aperture unit are consistent; and the detector and the calculation unit are used for receiving the third spectral information and performing spectral recovery on the detection data based on spatial variation aberration overlap-add analysis to obtain a target spectral image. According to the invention, while the dispersion resolution and the measurement precision are ensured, the spatial resolution and the spectral accuracy of spectral imaging are improved.

The invention relates to a picosecond Raman laser based on a heavy water-air heterogeneous interface asymmetric cavity, which is characterized in that laser beams output by an excitation source are subjected to frequency doubling conversion through a nonlinear crystal to generate second harmonics as pump light for stimulated Raman scattering; the reflector M1 filters residual fundamental frequency light, and the reflector M2 guides the pump light to be vertically focused to the sample cell through the lens. An observation screen is arranged behind the sample pool to display light intensity distribution, pump light is reflected by the light path adjusting system to be horizontally focused into the sample pool, and output light is guided to a wavelength separation system composed of a dispersion prism and a dichroscope through a notch reflector. According to the signal detection system, pumping energy is monitored through a power energy meter, a stimulated Raman scattering signal (SRS) is coupled to a spectrograph through a multimode optical fiber, an ultrafast detector is matched with an oscilloscope to record pulse waveforms, light path collimation is achieved through a translation table and a rotating base, and multi-dimensional characterization is completed. The device has the advantages of high wavelength conversion efficiency and good sensitivity, and can be used for spectral analysis, substance detection and the like.

The application discloses a pulse compressor and a pulse compression method. The pulse compressor comprises: a grating, which is used for diffracting a stretched pulse incident on a first side of the grating to obtain first diffracted light and compensating second-order dispersion of the stretched pulse; a prism assembly, which is located on a second side of the grating and is used for refracting the first diffracted light to obtain refracted light and eliminating third-order dispersion of the stretched pulse while again compensating the second-order dispersion of the stretched pulse; a reflection assembly, which is used for reflecting the refracted light to obtain reflected light, and is used for diffracting the reflected light in the grating again after the reflected light is refracted in the prism assembly, to obtain second diffracted light parallel to the first side of the grating; and a first mirror, which is used for reflecting the second diffracted light to return and be parallel to the first diffracted light, so that the stretched pulse generates a doubled dispersion amount and the spot of the stretched pulse is restored to an initial state. According to the pulse compressor, the occupied space of the pulse compressor can be reduced, and the pulse compressor is easy to integrate.

A spectrally shearing optical relay system, said relay system being comprised of two halves disposed symmetrically about an aperture stop S, wherein each half comprises a plurality of rotationally symmetric optical elements forming an objective and a com-pound prism comprised of a plurality of dispersing prisms. The compound prisms are located between the objectives and the aperture stop. An imaging device with such an optical relay system is also proposed.

The application discloses a wavelength selective switch and belongs to the technical field of optical communication. In view of the problems of the prior art, such as the large space occupied by the switch lens, the large process development difficulty caused by the position and angle of the switch lens needing to be adjusted in combination with other optical elements, and the like, the application provides a wavelength selective switch, a second lens is connected to one side of a prism to form a self-focusing dispersion prism grating, the second lens is arranged in sequence along the incident direction of a polarized light beam, the diffraction grating is arranged on one side of the self-focusing lens to form a second lens, and the self-focusing lens and the diffraction grating are arranged in sequence along the incident direction of the polarized light beam. Thus, the self-focusing dispersion prism grating is used in the WSS optical system structure to separate the polarized light beam by wavelength, the switch lens is not needed, and the optical path adjustment in combination with other optical elements is not needed, so that the WSS optical system structure is simpler.

The invention relates to a hyperspectral microscopic imaging system which comprises a front imaging module and a hyperspectral rear imaging module. The front imaging module is used for collecting a sample optical signal and imaging to obtain a front image light beam; the hyperspectral rear imaging module is used for carrying out dispersion on the front image light beam according to the dispersion direction to obtain a spatial spectral image; comprising a magnifying lens group, a segmentation assembly and a dispersion lens group, the front image light beam passes through the magnifying lens group and is magnified into a magnified image in the dispersion direction, and the segmentation assembly is arranged on the image plane of the magnified image; the segmentation assembly comprises a plurality of micro-lens groups which are arranged side by side in the dispersion direction and cover the range of the amplified image; the dispersion lens group comprises a collimating lens and a converging lens which have the same focal length, the collimating lens and the converging lens form a relay lens group, and a dispersion prism is arranged between the collimating lens and the converging lens according to the dispersion direction. According to the hyperspectral microscopic imaging system provided by the invention, the multispectral superposed space image obtained by the front imaging module is amplified through the amplification lens group, then is segmented by the segmentation assembly and is converged into discrete sub-images, camera detection resources for recording spectral information are created, the dissociated spectral information is integrated into the space information, and the imaging quality is improved. And the image is recorded by the camera to obtain a space-spectrum image without superposition crosstalk, so that the distortion of space information is reduced while space-spectrum separation is realized.

The invention belongs to the field of spectrum testing, and particularly relates to a channel spectrum testing system and method based on a point detector, and the method comprises the steps: S1, enabling a light source to emit composite light to a splicing primary mirror; s2, the compound light is reflected by each sub-mirror of the spliced primary mirror and then enters an interferometer for interference to form interference light; s3, interference light is subjected to dispersion of a dispersion prism and compression shaping of a cylindrical lens in sequence to form linear light spots, and the linear light spots are received by a point detector array; and S4, performing fitting and phase calculation on the dispersion interference fringes to realize confocal adjustment of the spliced primary mirror. The method does not need to calibrate dispersion interference fringes, greatly reduces the cost and complexity of the system, and improves the reliability of the system.