81 results about "Imaging spectrometer" patented technology

The invention, which belongs to the technical field of spectral imaging, discloses an ultra-wide-band ultra-wide-field-of-view high-spectral-resolution real-time imaging spectrometer comprising a first micro-lens array, a plurality of optical fibers, a plurality of second micro-lens arrays and a plurality of assemblies. First micro lenses in each column of the first micro lens array are arranged on a vertical plane arc, and micro lenses in each row are arranged on a horizontal plane straight line, so that incident light of a one-dimensional ultra-wide view field is obtained in real time; through optical fiber coupling, incident light is transmitted to the second micro lens array to be collimated into parallel light beams; according to the components, light of different wavebands is processed through the optical filter, the plane transmission grating and the detector, first-order diffraction light beams of different wavelengths in the different wavebands are received by the detector after diffraction, and space information and spectral information are obtained in real time according to an irradiated target block. The imaging spectrometer provided by the invention has the advantages of ultra-wide wave band, ultra-wide field of view, high spectral resolution, real-time measurement, compact structure and high stability, and is suitable for a remote sensing photoelectric reconnaissance detection system.

The invention provides a lens optical fiber array coupling system and a chromaticity measurement system and method, and belongs to the field of chromaticity measurement, and the lens optical fiber array coupling system comprises an imaging lens which is used for obtaining incident light of an object to be measured and guiding the incident light to an array optical fiber; the end face of the array optical fiber is located on the first image plane of the imaging lens, the normal of at least part of the optical fiber end face in the array optical fiber has a deflection angle relative to the normal of the first image plane, and the deflection angle is angle deflection performed by taking the main light ray of the light received by the corresponding optical fiber position as a target reference; and the imaging spectrometer is used for receiving the light information sent by the array optical fiber. By setting the deflection angle of the array optical fiber, the effective receiving area of the optical fiber is maximized, and the change of the transmission efficiency of light of different wavebands is avoided.

The invention provides a hyperspectral imaging system. The hyperspectral imaging system comprises a telescope group, a collimator objective, a prism, a volume holographic diffraction grating, an imaging objective and an imaging sensor which are arranged in sequence, the telescope group is composed of a primary reflector, a secondary reflector, a third reflector, a plane reflector and an entrance slit; the primary reflector, the secondary reflector and the third reflector form an off-axis three-reflector structure; the plane reflector is used for folding a light path; the collimating objective lens, the prism, the volume holographic diffraction grating, the imaging objective lens and the imaging sensor form an imaging spectrometer, and an entrance slit is used as object space input; the formed off-axis three-mirror and folded light path and an imaging spectrometer are in coaxial butt joint by taking an entrance slit as a node, and are used for joint correction and splicing to form a hyperspectral imaging system. According to the optical path architecture, optimal matching of the unobstructed total reflection front end and the transmission type rear end is realized, and the detection sensitivity of crop weak spectrum signals is greatly improved while a better modulation transfer function of a full view field is ensured.

The utility model discloses a multi-source target detection device, and relates to the field of spectral detectors, a hyperspectral imaging module comprises a movable imaging lens protruding out of a mounting shell, an imaging spectrometer communicated with the imaging lens, and a detector mounted at the output part of the imaging spectrometer; the RGB camera and the imaging lens are located in the same acquisition direction, and a lens of the RGB camera is embedded into the surface of the shell to acquire an RGB image; the push-sweeping module is mounted on the inner wall of the mounting shell and comprises a driving motor, a sliding rail and a push-sweeping platform; the push-broom platform is mounted on the slide rail, the imaging lens is embedded in a mounting hole of the push-broom platform, and light enters through a slit at the entrance of the spectrometer; the push-scan platform is controlled based on the driving motor and moves along the sliding rail, and a hyperspectral image is obtained through push-scan. According to the scheme, the problems of poor precision and difficulty in correction of aircraft push-scan imaging are solved through the built-in push-scan module, and image type diversification is realized through the built-in multifunctional camera module.

The application discloses a kind of full polarization spectral imaging device and detection method, contain sequentially arranged polarization modulator, imaging spectrometer, data acquisition processing display system to incident light;Polarization modulator is single fixed retarder and single fixed linear polarizer sequentially arranged along incident light, can carry out spectral modulation to full stokes parameter, it has the superiority of simple, ultra-compact, miniaturization, anti-system error in structure.By constructing complete imaging physical model or constructing imaging physical model based on compressed sensing, then using untrained artificial neural network realizes the full stokes parameter image reconstruction under each narrow waveband, and the deep neural network of "black box operation" is endowed with physical meaning.The reconstructed polarization spectral resolution can be consistent with the resolution of the imaging spectrometer used;And it has the characteristics of strong anti-noise ability, so as to ensure high-quality reconstruction.

The application discloses a kind of global light path adjusting devices and adjusting methods of correction lens group for solar imaging spectrometer, including correction lens group and adjustment shim, the front end of correction lens group is formed as first reference surface, the rear end of correction lens group is formed as second reference surface;The first reference surface of correction lens group is used as the reference of off-axis three-mirror optical system of global light path system of solar imaging spectrometer;The second reference surface of correction lens group is used as the reference of spectral scanning imaging system of global light path system of solar imaging spectrometer.The adjusting device and method of the application utilize the design of the form of self connection interface and the introduction of adjusting reference, reduce the difficulty of angle adjusting of lens group by means of external reference mirror in the prior art, can quickly and accurately connect the optical system of front end and rear end, ensure that the imaging quality of imaging spectrometer optical system is optimal.

This invention provides a catadioptric shortwave infrared imaging spectrometer, comprising, in order of light incidence, an entrance slit, a plane mirror, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a grating, and an imaging sensor. The plane mirror, together with the upper portions of the first, second, third, fourth, fifth, sixth, and seventh lenses, forms a collimation system. The grating, together with the lower portions of the seventh, sixth, fifth, fourth, third, second, and first lenses, and the imaging sensor, together form an imaging system. Collimation and imaging share a single lens group, resulting in a compact structure, easier aberration correction, simpler assembly and adjustment, better image quality, lower tolerance sensitivity, and reduced assembly difficulty.

The utility model discloses an imaging spectrometer monochromator convenient to install and adjust, which relates to the technical field of optical instruments and comprises a fixed bottom plate, and an entrance slit group, a collimation imaging light path group, a grating group, a focusing imaging light path group and a detector assembly which are fixed on the fixed bottom plate and are sequentially distributed on a light path, the entrance slit group is connected to the fixed bottom plate through the slit adjusting plate; the collimation imaging light path group and the focusing imaging light path group are arranged on the fixed bottom plate through the support adjusting assembly; the grating group is connected to the fixed bottom plate through a grating adjusting plate; and each component can be finely adjusted. The assembling and adjusting operation is simpler, more convenient and faster, and the consistency, the reliability and the production efficiency are improved.

The present application relates to a kind of based on spectrometer imaging method and system of blaze grating.From the far field light of incident slit, into plano-convex lens, refract by plano-convex lens and meniscus lens, after again passing through thick catadioptric mirror concave surface reflection, with convergent light beam form is incident to convex blaze grating, after grating diffraction and reflection, form multiple beam single wavelength divergent light beam, in turn through thick catadioptric mirror reflection, meniscus lens and plano-convex lens refract, image on image plane, realize spectral imaging.The present application adopts immersion littrow-Offner structure, incident slit is off-axis in meridian and sagittal direction, so that incident slit and image plane are separated, facilitate engineering implementation;Spectrometer imaging system uses full immersion optical path, so that imaging spectrometer structure is more simple and compact, more convenient to assemble and use;Grating selects convex blaze grating, has high diffraction efficiency, so that the present imaging system can play a role in more extensive application field.

This invention relates to the field of imaging spectrometer technology and discloses an imaging spectrometer assembly and adjustment method. The method includes: installing an auxiliary assembly and adjustment slit assembly at the spectrometer slit assembly mounting position; coarsely adjusting the detector using a first adjustment device to obtain a first position range that meets the first coarse adjustment conditions; successively adjusting the detector position within the first position range using the first adjustment device; after each adjustment, illuminating the auxiliary assembly and adjustment slit assembly with beams of different wavelengths using a monochromatic light source to form a slit image on the detector; determining the spectral resolution of the current detector position in the first preset field of view based on the response value of the slit image in the first preset field of view during each wavelength illumination; and determining the fixed position of the detector based on the spectral resolution of each wavelength in the first preset field of view. This invention enables quantitative optimization of spectral resolution and improves assembly and adjustment accuracy.

The application discloses a design method of a free curved surface concave grating imaging spectrometer, which comprises the following steps: S1, selecting a series of light rays incident from different positions of a slit as characteristic light rays; S2, calculating the coordinates and normal of a characteristic data point at the intersection of the characteristic light rays and a free curved surface concave grating surface; S3, obtaining an initial structure by fitting the free curved surface of the free curved surface concave grating; and S4, optimizing the initial structure. The application also relates to a free curved surface concave grating imaging spectrometer obtained by using the design method of the free curved surface concave grating imaging spectrometer.

The application discloses an infrared large-view-field wide-spectrum multi-spectrum imaging spectrometer optical system, which is coaxially arranged in sequence from an object plane to a focal plane as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a filter wheel; the first lens and the fourth lens are meniscus positive lenses, the second lens, the third lens and the fifth lens are meniscus negative lenses, and the sixth lens is a double-convex positive lens. The application adopts common chalcogenide and zinc selenide crystal infrared materials, corrects aberration and chromatic aberration by optimizing surface shape parameters of each surface and adopting aspheric surfaces, realizes high-quality imaging in a wide waveband range of 2.5-15 mu m, has the characteristics of large view field, small distortion, athermalization and super-long back intercept, is easy to produce and adjust, has strong versatility, and can be applied to the fields of monitoring of chemical harmful gases, environmental protection, agriculture and food safety, medical treatment and health and judicial identification.

The invention relates to the technical field of agricultural product quality safety nondestructive testing, and discloses a fruit surface pesticide residue dynamic monitoring device and method.The fruit surface pesticide residue dynamic monitoring device comprises a camera obscura, a master control and processing computer, a supporting table, a supporting plate and a supporting frame are assembled on the inner wall of the camera obscura, and an imaging spectrometer is assembled on the top of the supporting table; a camera is assembled on the outer wall of the imaging spectrometer, and a second motor is assembled on the outer wall of the supporting plate. A rotating disc rotates, the rotating disc drives a mechanical arm to rotate so as to adjust the distance of a mechanical clamping jaw, then the mechanical clamping jaw clamps a sample at the top of a conveying belt, and after being extruded by a pressed block, the sample can move towards the interior of a placement groove; a spring I can transmit pressure into a pressure detection device after being extruded, so that a rotating plate can drive a light supplementing plate to rotate when rotating, and the light supplementing plate is placed at a 45-degree angle of a sample, so that the light supplementing plate supplements light to the sample.

The present application relates to the technical field of imaging spectrometer, and discloses a kind of adjusting method and system for regulating smile distortion of imaging spectrometer, the method comprises: using monochromatic light source by target shape target illumination entrance light tube, target image is formed in detector, the response value of target image is read in each wave band by detector, according to the response value of target image in each wave band, determine the center wavelength of target wave band in corresponding several set field of view, the maximum value of the center wavelength difference in all set field of view is as the smile distortion value of target wave band, the angle of detector is adjusted according to smile distortion value, repeat the above steps, until the smile distortion value obtained meets termination condition.The present application can quickly quantitatively test spectral smile distortion during adjustment process, realize detector sub-pixel level regulation and spectral smile distortion optimization, improve adjustment precision.

The present application relates to a kind of snapshot imaging spectrometer's spectroscopic imaging method and its system.Spectroscopic imaging system is off-axis three reverse structure, and working wave band is 400nm~800nm;According to the direction of light incidence, it includes the first free curved surface mirror that is curved to the direction of light incidence in approximate concentric structure, the convex surface diffraction grating that is curved to the direction of light incidence in the direction of light incidence in reverse and the second free curved surface mirror that is curved to the direction of light incidence, filter and two respectively for focusing the monochromatic light of different wavelength that is reflected or transmitted by filter photoelectric sensor.The spectroscopic imaging method used in the present application can realize the full visible light wave band coverage of working wave band, effectively balances various monochromatic aberrations, and achieves the imaging effect close to diffraction limit;Spectroscopic imaging system has the characteristics of large relative aperture, high spectral resolution, wide working wave band, no chromatic aberration, light and small volume.

The invention discloses a design method of a wavenumber linearity dispersion optical system and an imaging spectrometer, including: building an optical system including a grating, a prism and an objective lens that are sequentially arranged, the grating adjoins the prism; defining a linearity evaluation coefficient RMS; assigning a minimum value to the linearity evaluation coefficient RMS through adjustment to the vertex angle of the prism, when the linearity evaluation coefficient RMS is at minimum, the vertex angle of the prism being α1; acquiring compensations for distortion and longitudinal chromatic aberration of the objective lens based on the interval between equal-difference wavenumbers on the image plane when the vertex angle of the prism is α1; and optimizing the objective lens based on the compensations for distortion and longitudinal chromatic aberration of the objective lens to obtain an optimized optical system. Higher wavenumber linearity can be achieved through objective-lens-aberration compensated wavenumber linearity.

The application discloses a data processing method, system, device and medium of a linearly variable filter imaging spectrometer. The method comprises the following steps: performing geometric correction on an original image, generating a corrected image and recording a waveband row number, and generating a waveband index file for positioning irregularly arranged waveband pixels in the corrected image; extracting the same waveband data from the corrected image and the waveband index file frame by frame from a plurality of continuous corrected images to splice a plurality of single-waveband images; performing weighted fusion of the plurality of single-waveband images based on texture differences to obtain a synthetic waveband image; and performing multi-scale step-by-step registration of the synthetic waveband image based on an image pyramid, combining global coarse registration and local fine adjustment, and realizing accurate registration between wavebands. The application solves the problems of complicated waveband extraction, missing single-waveband data, low signal-to-noise ratio and difficult accurate registration of complex deformation between wavebands in data processing of the linearly variable filter imaging spectrometer, and realizes efficient and high-precision spectral cube reconstruction.

The application belongs to the field of spectrometers, and particularly relates to a solar imaging spectrometer based on a multiple filter setting. Two pieces of filter window glass with ultraviolet cutoff and bandpass filtering functions are sequentially arranged at the front end of the solar imaging spectrometer, and a narrow-band filter is arranged at the focal point of a spectral imaging light path, so that the imaging spectral bandwidth of a solar Halpha spectrum is accurately controlled within a range of 1 nm through three-stage filtering. The application solves the problems of high requirement of a single filter film system, difficulty in heat control and poor stray light suppression, and realizes super-narrow-band spectral observation with accurate central wavelength and high imaging quality.

The invention discloses a multicolor optical filter, which is based on an optical thin film theory, realizes acquisition of multichannel spectral information by selecting two optical thin film materials with refractive indexes as large as possible, designing a special film system structure and combining a vacuum coating technology. The multicolor optical filter is simple in manufacturing process and high in yield, can be matched with an optical system to form an imaging spectrometer, and can be widely applied to multispectral intensive acquisition of remote sensing instruments. The multicolor optical filter has the advantages that two thin film materials with the refractive index difference value as large as possible are selected, a special film system is designed, and fine light splitting is achieved; a plurality of spectrum channels can be formed on a traditional optical substrate and a chip of a detector, and simultaneous acquisition of spectrum information of a plurality of wavelengths can be realized.

A system includes a detector and at least one optical component that directs light toward the detector. The system also includes a spatially varying spectral filter that is positioned in the optical train and that has at least two bandpass zones: a first bandpass zone that passes light of a first wavelength range and a second bandpass zone that passes light of a second wavelength range that is different from the first wavelength range. The system also includes a circuit configured to perform a first transform operation on light of the first wavelength detected by the detector and to perform a second transform operation on light of the second wavelength detected by the detector.

The utility model discloses a spectral confocal three-dimensional measurement system based on spatial modulation, comprising a light source used for generating a compound color light beam; the light space modulation element is used for adjusting the incident space position of the incident light of the light source in a time-sharing manner; the dispersion imaging optical assembly is used for dispersing the multi-color light beams adjusted by the light space modulation element and focusing the multi-color light beams to different depths in the first space direction; after the position of the incidence space is adjusted, light with different depths correspondingly enters different positions of the surface of a sample to be measured, is reflected by the sample to be measured and then is coupled into an imaging spectrometer. According to the system realized by the utility model, the measurement precision and the measurement speed can be effectively improved by virtue of the change of the light position in space by the light space modulation element and the combination of the corresponding dispersion imaging light path element.

The invention provides a method for realizing high-precision vegetation water content index inversion by fusing GNSS-IR (Global Navigation Satellite System-Infrared Spectroscopy) and hyperspectral data, and belongs to the technical field of vegetation water content change monitoring. The method comprises the following steps: calculating amplitude characteristic parameters in GNSS-IR observed quantity; processing the hyperspectral data to obtain surface reflectance of red light and near-infrared bands; multiple linear and random forest regression algorithms are respectively used to fuse GNSS-IR and hyperspectral data to establish a normalized differential vegetation index inversion model, and the simultaneous observation data of a medium-resolution imaging spectrometer is used as a comparison and the inversion precision is calculated. According to the method, GNSS-IR and hyperspectral combined observation experiments are carried out, data are fused to obtain vegetation water content changes, and the vegetation indexes are monitored at high precision by comparing the vegetation water content changes with MODIS vegetation water content index data. Compared with a single data source, the method provided by the invention improves the inversion precision of the vegetation water content.

The present invention relates to an imaging spectrometer (10) comprising: - an entrance slit (11) for receiving radiation over a range of wavelengths, - an image detector resolved in two directions, - a spherical mirror (12) with focus F positioned opposite said entrance slit (11), said entrance slit (11) being positioned at the focus F of said spherical mirror (12), - a spectrally dispersive optical assembly (17) for dispersing said radiation as a function of wavelength and focusing it into a detection plane of the image detector, - an extraction mirror (16) for directing the radiation from the spherical mirror (12) onto the spectrally dispersive optical assembly (17), said entrance slit (11) and said spherical mirror (12) being arranged so that the radiation is incident on said spherical mirror (12) at an angle of incidence between ]0.8°], or more preferably ]0.2°]. and even more preferentially around or equal to 1°.

The application provides a kind of spatiotemporal modulation Fourier transform stokes polarization imaging spectrometer, including in turn along the direction of propagation of light beam: telescope system, polarization modulation system, converging system, polarization interference system and imaging system;Target scene emitted target light field is collimated into parallel light field in telescope system and is incident;Linearly polarized light field is obtained after collimated parallel light field is incident to polarization modulation system and is incident to converging system;Converging system is used to image linearly polarized light field to polarization interference system and produce superposition interference, form polarization interference imaging light field with specific optical path difference distribution characteristics and are incident to imaging system to obtain polarization interference image;By step scanning to target scene, obtain polarization interference image cube, by extracting each field of view corresponding interference order interference map, carry out stokes channel filtering and fourier transform, and then demodulate the spectral information of each stokes parameter of target light field.

The invention discloses a reflective uniform dispersion imaging spectrometer, which comprises a linear optical fiber array, a collimation optical system, a dispersion element and an imaging optical system, wherein the linear optical fiber array is arranged at a slit position of a focal plane of the telescope; emergent light of a telescope passes through the linear optical fiber array to obtain an intermediate image of a small view field, the intermediate image of the small view field passes through the collimation optical system to obtain collimated parallel light, the collimated parallel light passes through the dispersion element to obtain dispersion light, and the dispersion light passes through the imaging optical system to obtain a spectral image. The invention can greatly reduce the instantaneous field of view of the imaging spectrometer, and has the advantages of small volume and light weight.

The invention relates to the technical field of imaging spectrometers, and discloses an adjustment method and system for regulating and controlling smile distortion of an imaging spectrograph, and the method comprises the steps: enabling a monochromatic light source to pass through a target illumination incident light tube with a target shape, forming a target image at a detector, reading the response value of the target image at each wave band through the detector, and calculating the smile distortion of the imaging spectrograph. Determining the central wavelength of the target wave band in a plurality of corresponding set view fields according to the response value of the target image in each wave band, taking the maximum value of the difference values of the central wavelengths in all the set view fields as the smile distortion value of the target wave band, adjusting the angle of the detector according to the smile distortion value, and repeating the steps until the obtained smile distortion value meets a termination condition. According to the invention, the spectrum smile distortion can be rapidly and quantitatively tested in the installation and adjustment process, the sub-pixel level regulation and control of the detector and the optimization of the spectrum smile distortion are realized, and the installation and adjustment precision is improved.

An X-ray solar imaging energy disperse spectroscopy covering Fe characteristic peaks belongs to the technical field of space X-ray detection, and comprises a nested X-ray focusing optical system, an X-ray imaging detection unit and a support shielding structure. The nested X-ray focusing optical system comprises an X-ray collimator assembly and an X-ray grazing incidence lens assembly. The effective observation area of the solar X-rays is enlarged through the multi-layer nesting of the X-ray lenses, and the observation of the solar X-rays with higher energy can be supported. The front end of the X-ray collimator assembly is covered with a shading film, so that solar heat entering the instrument is reduced, and the X-ray transmittance is guaranteed. The X-ray imaging detection unit comprises a shading film, an imaging detector and an imaging reading circuit. X-ray high-resolution imaging of solar flares is realized by adopting the X-ray imaging detector. The dynamic detection range of the instrument is improved through local high-speed reading of the solar flare imaging area.

The invention relates to the technical field of imaging spectrometers, and discloses an imaging spectrometer installation and adjustment method, which comprises the following steps of: installing an auxiliary installation and adjustment slit assembly at an installation position of a spectrometer slit assembly; performing coarse adjustment on the detector through a first adjusting device to obtain a first position range meeting a first coarse adjustment condition; gradually adjusting the position of the detector in a first position range through a first adjusting device, and after the position of the detector is adjusted each time, using a monochromatic light source to illuminate light beams with different wavebands to assist in installing and adjusting the slit assembly, and forming a slit image on the detector; determining the spectral resolution of the current detector position in a first preset view field according to the response value of the slit image of the first preset view field of the detector during illumination of each wave band; and the curing position of the detector is determined based on the spectral resolution of each wave band in the first preset field of view. According to the invention, quantitative optimization of the spectral resolution can be realized, and the installation and adjustment precision is improved.

The invention discloses an imaging spectrometer structure capable of scanning from visible light to near infrared in the technical field of spectrum analysis instruments, which is characterized in that a front objective lens, an entrance slit, a collimation system, a wavelength selective coating prism, a dispersion element, a focusing system and an area array detector are sequentially arranged, and the dispersion element comprises a GP structure and a PGP structure; the focusing system comprises a first focusing system and a second focusing system which respectively correspond to the GP structure and the PGP structure, and the area array detector comprises a first area array detector and a second area array detector which respectively correspond to the first focusing system and the second focusing system. The cost is reduced by sharing a front light path and coating light splitting, dispersion linearity is optimized by combining GP / PGP combination, high spectral resolution and high light transmission efficiency are achieved, the overall structure is compact and stable, installation and adjustment are convenient, and the broadband high-precision imaging system is suitable for scenes needing broadband high-precision imaging such as remote sensing and environment monitoring.

The application discloses a preparation method of a wide-spectrum coding array filter, comprising the following steps: obtaining, by using a nano-imprinting method, an imprinted array structure with different heights in a first dimension at one time; and obtaining, by using an ultraviolet lithography-pattern transfer method, a lithography array structure with different heights in a second dimension on the obtained imprinted array structure, so as to finally obtain a wide-spectrum coding array filter with different heights. The application also discloses the wide-spectrum coding array filter prepared by the above method. The preparation method combines a nano-imprinting method, an ultraviolet lithography method, a thin film deposition method and other processing methods, the number of times of ultraviolet lithography-pattern transfer required by the preparation method can be greatly reduced, and the number of times of ultraviolet lithography-pattern transfer does not increase with the increase of the number of filter blocks. The similar preparation method can be applied to miniature (imaging) spectral chip / modules, miniature (imaging) spectrometers and other products, and is expected to be widely applied in the fields of portable industrial detection, portable agricultural detection and consumer electronics.