125 results about "Imaging spectrometer" patented technology

The invention relates to a total primary productivity high-precision downscaling method based on a multi-scale attention mechanism, and belongs to the technical field of remote sensing. According to the method, the technical problems of fuzzy details, fuzzy boundaries and insufficient fitting precision of the existing GPP downscaling technology in a complex terrain region are solved. According to the technical scheme, an Enhanced Multi-scale Residual Attention Network (EMSRAN) model is constructed, multi-source remote sensing data including a medium-resolution imaging spectrometer (MODIS) GPP product and a terrestrial satellite auxiliary factor are integrated, data preprocessing, sample generation and model training and optimization are carried out, and a high-resolution GPP image is output. Technical effects include significant improvement of spatial detail reduction ability, enhancement of heterogeneous ecosystem adaptability, enhancement of boundary definition expression, and improvement of carbon cycle research data reliability.

The invention provides an imaging spectrometer motion compensation imaging model construction method, an imaging model and a device, and relates to the technical field of space remote sensing. The method comprises the following steps: establishing a satellite orbit model, and defining a plurality of coordinate systems such as a detector coordinate system and a spectrometer imaging coordinate system and a conversion relation thereof; constructing a detector-scanning mirror-lunar surface ideal geometric mapping model based on the load optical parameters and a ray tracing method; determining the relation between the rotation angle of the scanning mirror and imaging spectrum view field positioning by using a reflecting prism conjugation theory; a quantitative relation is established by combining parameters such as satellite orbits and position postures, and finally a motion compensation imaging model is established. According to the method, the influence of the on-orbit error on the compensation imaging model is analyzed, and the error is used as an uncertainty component to be coupled into the model. According to the method, the problems of low model precision, neglect of influence of orbit observation parameters on imaging and the like in the prior art are solved, high-precision motion estimation and compensation can be realized, and the quality of data acquired by an imaging spectrometer is remarkably improved.

The invention provides a slit-type spectral imaging method based on filtering phase reconstruction and a grating spectrometer. The method comprises the following steps: measuring wavefront aberration of a slit-type grating imaging spectrometer before slit filtering by using a wavefront sensor; based on a slit filtering principle, reconstructing a phase function after slit filtering by using wavefront aberration before slit filtering; and capturing a slit image, and reconstructing the slit image by using the reconstructed filtered phase function of the slit to obtain a final reconstructed image. According to the method, effective recovery of the slit imaging data of the grating spectrometer based on the slit is realized, the influence of optical aberration and image noise on the spectrum and spatial resolution of the spectrometer is effectively eliminated, and the slit imaging quality is remarkably improved and is close to the diffraction limit.

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 discloses a thin film thickness measurement system, method and device and a computer readable storage medium, and relates to the technical field of thin film thickness measurement, and the system comprises a light source unit which is used for transmitting an initial light source signal; the light splitting unit is arranged on a transmitting path of the initial light source signal and is used for splitting the initial light source signal into a first light source signal and a second light source signal; the imaging objective lens is arranged on an emission path of the first light source signal, a to-be-measured film is placed at a measurement position, and the imaging objective lens is used for irradiating the first light source signal onto the to-be-measured film, forming a measurement signal and returning the measurement signal; the reference signal unit is arranged on a transmitting path of the second light source signal and is used for returning a reference signal under the action of the second light source signal; and the imaging spectrometer is arranged on the reflection path of the light splitting unit and is used for determining the thickness of the to-be-measured film based on the reference signal and the measurement signal returned by the light splitting unit, so that the measurement accuracy of the film thickness is improved.

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 present invention relates to a computed tomography spectrometer based on a metasurface diffraction element. The computed tomography spectrometer includes an optical system structure, a focal plane detector, and a data acquisition and processing system; the optical system structure includes a converging lens group, a field stop, a collimating lens group, a metasurface holographic grating, and an imaging lens group. The present invention combines a metasurface with a computed tomography spectrometer, which can avoid the manufacturing difficulties of the computed tomography spectrometer, miniaturize the computed tomography spectrometer, and produce a better diffraction effect, so that the focal plane array target surface and the overall size of the spectrometer are both in the millimeter range, and can realize an imaging spectrometer with a mobile phone terminal or even smaller structure.

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 invention relates to the field of remote sensing detection imaging systems, in particular to a polarization hyperspectral imaging system, an imaging method and application, and the system comprises a housing, an imaging lens, an imaging spectrometer, an area array polarization camera, a focusing translation assembly, a push-broom translation assembly and a processor. A mounting hole is formed in one side wall of the shell; the imaging lens is fixed on the casing through the mounting hole and extends out of the casing; an imaging spectrometer and an area array polarization camera are sequentially arranged in the machine shell from the imaging lens to the back, and the imaging spectrometer is connected with the area array polarization camera. The focusing translation assembly is arranged in the shell, the push-broom translation assembly is arranged on the focusing translation assembly, and the imaging spectrometer is arranged on the push-broom translation assembly; the processor is arranged in the machine shell and connected with the area array polarization camera, the focusing translation assembly and the push-broom translation assembly, and the processor is connected with an electronic output interface.

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.

The invention relates to a stray light suppression system based on a Dyson structure, and relates to the technical field of stray light suppression. The system comprises a spectrograph, an optical fiber array, a Dyson optical structure and a CCD (Charge Coupled Device) which are sequentially connected in a light path direction, wherein the Dyson optical structure comprises an image surface, a lens group and a reflector which are sequentially connected in the light path direction; the optical fiber array is connected with the Dyson optical structure at the image plane position; and the CCD is arranged at the image plane position. The stray light suppression system based on the Dyson structure is based on the design principle and structural characteristics of an existing imaging spectrometer, and stray light outside a view field is difficult to effectively improve by using a traditional method; based on a Dyson structure refraction and reflection concentric integration characteristic, an optical fiber array is used as a bridge and is coupled to an image plane position of an imaging spectrometer, and the optical fiber array and pixels are in one-to-one correspondence, so that separation of stray light and effective signals is realized, and stray light suppression capability is greatly improved.

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 present invention discloses a method for measuring the PRNU characteristics of an imaging spectrometer array detector. By constructing an optical model based on a monochromatic LED and an optical pinhole, an ideal correction light source can be obtained through a light field model fitting method of a diffraction spot. The method has a simple structure, reduces the PRNU correction error introduced by the light source, and realizes low-cost, high-precision PRNU testing. By adjusting the spot size and position, pixels in different areas on a single detector can be irradiated with light of different wavelengths. A control group area can be set to realize the study of the relationship between the PRNU of the imaging spectrometer detector and the wavelength, and the relationship between the PRNU and the irradiation time, thereby improving research efficiency and reliability.

This invention proposes a method for correcting image non-uniformity in an imaging spectrometer using uniform bright and dark regions. The method includes: obtaining correction coefficients in the laboratory for preliminary detector pixel calibration; selecting uniform bright and dark regions from the spectral band unaffected by banding noise after coefficient correction; applying a threshold constraint using an improved iterative method to remove abnormal signals in the uniform bright and dark regions to obtain a stable reference value; and using the reference value to calculate the gain and bias of all pixels in the spatial dimension, ultimately correcting non-uniformity across the entire image and spectral band. This method requires only a single non-uniform image that meets the requirements as input to quickly obtain good correction results, with low computational complexity and high correction speed.

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.

This invention discloses a stray light measurement device and a stray light correction method for imaging spectrometers. The measurement device includes a white light laser, a focusing system, a beam splitting system, a collimation system, a pinhole aperture, an adjustment stage, and an imaging spectrometer. Addressing the stray light problem in imaging spectrometers, the invention first suppresses stray light at its source by incorporating measures such as a stray light elimination aperture. Then, a stray light correction system is designed. Using the same device, two-dimensional stray light correction can be achieved for both the spectral and spatial dimensions of the array detector, avoiding repeated experimental measurements and simplifying the operation process. This invention is applicable to stray light suppression and correction in the spectral and spatial dimensions of imaging spectrometers. The stray light aperture setting method and stray light measurement device have important reference value for space imaging payloads and can provide technical support for improving radiometric calibration accuracy.

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 application relates to a long-wave infrared remote sensing imaging spectrometer objective, which is composed of a meniscus positive lens A, a meniscus negative lens B and a meniscus positive lens C arranged in sequence along the same optical axis; the convex surface of the meniscus positive lens A and the meniscus negative lens B faces the object side; the convex surface of the meniscus positive lens C faces the image side; an aperture diaphragm is located on the front surface or the rear surface of the meniscus positive lens A, and the chief ray of each field of view is parallel to the optical axis when exiting the lens; and infrared radiation emitted by an object is imaged on the focal plane of the objective. The application effectively corrects the aberration of the lens and realizes the output of a telecentric light path; when the temperature changes, the focal plane displacement of the objective matches the expansion and contraction of the aluminum alloy lens barrel, and the imaging position is relatively stable.

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.