529results about How to "High spectral resolution" patented technology

A spectral bio-imaging method for enhancing pathologic, physiologic, metabolic and health related spectral signatures of an eye tissue, the method comprising the steps of (a) providing an optical device for eye inspection being optically connected to a spectral imager; (b) illuminating the eye tissue with light via the iris, viewing the eye tissue through the optical device and spectral imager and obtaining a spectrum of light for each pixel of the eye tissue; and (c) attributing each of the pixels a color or intensity according to its spectral signature, thereby providing an image enhancing the spectral signatures of the eye tissue.

An electronic-integration compatible photonic integrated circuit (EIC-PIC) for achieving high-performance computing and signal processing is provided. The electronic-integration compatible photonic integrated circuit comprises a plurality of electronic circuit structures and a plurality of photonic circuit structures. The electronic and photonic circuit structures are integrated by a process referred to as monolithic integration. An electronic circuit structure includes one or more electronic devices and a photonic circuit structure includes one or more photonic devices. The integration steps of electronic and photonic devices are further inserted into standard CMOS process. The photonic circuit structures and the electronic circuit structures are integrated to form the electronic-integration compatible photonic integrated circuit device.

A device to illuminate a object, to excite its fluorescence light emission, and detect the emitted fluorescence spectrum, comprising: at least one illumination system (13), adapted to receive light from a light source (11), to select at least one wavelength bands of light spectrum of the source (11), to illuminate a object (15) with light filtered in that way (14); and a detection system (17), adapted to detect fluorescence light (16) emitted by the object (15), to select at least one wavelength bands of fluorescence, light spectrum (16), to record the spectrum of the filtered light; characterized in that said illumination system (13) comprises: at least one first dispersive element (41), at least one focusing optics (43), at least one spatial fitter of excitation (44), at least one collimating optics (45) and at least one second dispersive element (47), wherein said detection system (17) comprises: at least one dispersive element (81), at least one focusing optics (83), at least one spatial filter of detection (84), at least one imaging optics (85) and at least one light detector (87).

The invention relates to an imaging spectral system based on compressed sensing and Hadamard transformation. The imaging spectral system comprises a telescope unit, an imaging lens, a first expanded beam collimating lens, a first digital micro-reflector, a camera, a concave surface collimation reflector, a light splitting optical grating, a first convergent lens, a second digital micro-reflector, a second convergent lens, a light combining optical grating, a third convergent lens, a point detector, a Hadamard inverse transformation module and a compression calculation association module.

The invention relates to a spectral imaging method and a spectrum imaging instrument of a snapshot-type high throughput, which aim at realizing a picture-type photograph. The spectrum instrument comprises a linear gradient filter array and an optical-field imaging mechanism, and the optical-field imaging mechanism comprises a primary mirror, a micro lens array and a detector. The filter array is arranged on an aperture diaphragm between lenses of the primary mirror, the filter array consists of a plurality of filters which have identical width and are arranged at intervals, and the filter is a linear gradient filter band with continuous spectrum. The micro lens array is arranged on an imaging surface of a front-mounted optical imaging system, and the detector is arranged on a focus plane of the micro lens array. The spectrum imaging method is characterized in that light in different directions transmitted or reflected by a target is imaged on one micro lens after being modulated by the primary mirror and the filter array, the light is dispersed by the micro lens onto a picture element of the detector to form a subimage, and finally three-dimensional spectrum image data is obtained. The complete spectrum image information of the target can be obtained through the photograph in one step, and the spectral imaging method and the spectrum imaging instrument can be used for monitoring and tracking a rapid variable or movable target.

A method and system are presented for producing an output coherent anti-stokes Raman scattering (CARS) signal of a medium. The method comprises generation of a unitary optical excitation pulse that carries a pump photon, a Stokes photon and a probe photon; and inducing a CARS process in the medium by exciting the medium by the at least one such unitary optical excitation pulse.

The invention relates to a time flight imaging spectrum system based on compressed sensing and coding transformation. The time flight imaging spectrum system comprises a pulse laser unit, a telescope unit, an imaging lens, a first beam expanding collimating lens, a first digital micro-mirror, a camera, a concave surface collimating mirror, a spectro-grating, a first convergent lens, a second digital micro-mirror, a second convergent lens, a light combining grating, a third convergent lens, a point detector, a Hadamard inverse transformation module, a compression calculation relevance module and a flight time relevance module. The pulse laser unit comprises an active pulse light source, a second beam expanding collimating lens and a second mirror. The telescope unit comprises a concave surface mirror, a convex surface mirror and a first mirror. The flight time relevance module comprises a synchronous control unit and a timescale converter.

The present invention provides methods and devices for optical performance monitoring using co-located switchable fiber Bragg gratings (FBGs) in conjunction with a few detectors. This arrangement combines the merit of both tunable FBG filters and discrete detectors to achieve high spectral resolution, fast detection process and great dynamic range. By using parallel co-located FBGs in conjunction with a banded architecture, the tuning range of each FBG becomes much smaller (equivalent of ˜0.08% strain). As a result, not only does the update speed of the spectral characteristics for each channel become much faster, but it effectively eliminates the concern of FBG long-term reliability as well.

The invention discloses a portable Terahertz remote sensing detector and a remote detection method. The detector comprises a signal generating device, a detector, a processor and an imaging display device, wherein the signal generating device comprises a Terahertz wave radiation source, a broadband tunable laser and a plasma generator; and the detector comprises a receiving element, a detecting element and a signal modulation circuit. The detection method comprises the following steps of: 1, dividing scanning subregions and pixel points and encoding scanning output frequencies of various scanning subregions; 2, arranging an assembly and generating a remote detection signal; 3, performing two-dimensional scanning; and 4, performing signal analysis processing, namely rapidly imaging and generating a Terahertz wave image with frequency spectrum characteristics, identifying a material type of a tested object, generating a charge coupled device (CCD) image and identifying the shape of the tested object. The detector is reasonable in design, easy to operate, flexible in detection mode, wide in application range and good in detection effect, and can fulfill the aims of rapidly imaging and remotely detecting by combining THz and induced fluorescence spectrum analysis with space imaging.

The invention provides a method for reconstructing a wide hyperspectral image based on fusion of mulspectral/hyperspectral images. The method for reconstructing the wide hyperspectral image based on fusion of the multispectral/hyperspectral images comprises the following steps that surface feature end members are synchronously extracted in an overlapping area of the multispectral/hyperspectral images; a fusion model among the multispectral/hyperspectral images is established according to the end members, a transformational relation is established, model parameters are resolved and calculated, and a model parameter base is established; selection of the model parameters is conducted through spectrum matching, and spectrum reconstruction is conducted on multispectral images pixels by pixels so that hyperspectral information can be obtained. According to the technical scheme, by means of data fusion, successive wide hyperspectral images which have high spectral resolutions can be obtained through reconstruction of other multispectral remote sensing data, the spectral resolutions of the hyperspectral images are identical to data of original hyperspectral images, the spatial resolution and the width are identical to the original multispectral data, the hyperspectral resolutions of the original hyperspectral images is kept, and the spatial resolution and the width of each of the hyperspectral images can be improved.

The invention provides a real-time correlator based on an FPGA, GPU and CPU mixed architecture. The real-time correlator comprises a signal sampling module which is provided with N channels used for sampling N channels of signals; an FPGA-based signal preprocessing module which is arranged to carry out frequency mixing, low-pass filtering and packing sequentially on the signals sampled by the channels, a CPU-based unpacking module which is arranged to unpack the signals packed by the signal preprocessing module, a GPU-based signal processing and correlation operation module which is arranged to carry out multi-phase filtering, Fourier transform, correlation operation and integration sequentially on the N channels of unpacked signals, and a CPU-based control module which is arranged to control corresponding processing by the signal preprocessing module and the signal processing and correlation operation module on one hand and is arranged to store and display the signals after integration on the other hand. The barrier that large-scale capacity expansion cannot be carried out due to limited FPGA logic resources is overcome, and the problem that the computing ability of a CPU is limited is solved.

A terahertz quickly imaging method of object to be tested includes dividing scan space to be a numbers of sub regions averagely in advance and then dividing each sub region to be a numbers of pixel points averagely, carrying out coding on pixel in each sub region by utilizing different TH2 wave frequency and suing TH2 wave to scan object to be tested as per set frequency code for obtaining TH2 image with spectrum character of object to be tested. The device used for obtaining TH2 image with spectrum character of object to be tested is also disclosed.

The invention discloses an optical path structure of a cylindrical anastigmatic grating dispersion type imaging spectrometer. The optical structure comprises a slit (1), a collimating objective lens (2) for reflecting light passing through the slit to a grating (3), and the grating (3) for splitting the light; an imaging objective lens group consists of a spherical reflector (4) and a cylindrical reflector (5); and the split light is imaged to a photosensitive surface of a detector (6) to perform sub-spectral imaging. The spectrometer uses fully reflective optical elements, and all the reflecting elements are plated with high-reflectivity membranes. The structure is characterized by introducing a cylindrical mirror to reduce sagittal surface astigmatism of the grating dispersion type imaging spectrometer, so the spectral resolution and the imaging resolution of the spectrometer are greatly improved.

The invention discloses a grating spectrometer capable of realizing spectral super-resolution reduction, and relates to the field of spectral measurement. The grating spectrometer structurally comprises an incident slit, a diaphragm, a collimating reflector, a diffraction grating, a converging reflector, a linear array detector, a piezoelectric ceramic driving platform, a piezoelectric ceramic controller and a data processing system, wherein light to be detected enters the incident slit, is reflected to the diffraction grating through the collimating reflector, and is focused to form a spectral image on a pixel array of the linear array detector through the converging reflector after being split by the diffraction grating; the linear array detector is fixedly arranged on the piezoelectric ceramic driving platform; the piezoelectric ceramic driving platform is controlled by the piezoelectric ceramic controller to be slightly displaced in a dispersion direction to finish measurement once until the piezoelectric ceramic driving platform is displaced for N+1 times; data obtained in the first N times is processed by the data processing system to obtain spectral data by spectral super-resolution reduction. The grating spectrometer is simple in structure; all the parts except the one-dimensional piezoelectric ceramic driving platform are fixed, so that high spectral resolution can be achieved within a wide spectral range.

The invention discloses an area target echo beam center velocity measurement method. Firstly, echoes are subjected to acceleration compensation; secondly, whether a velocity filtering value is in a near-zone measurement pattern or a far-zone measurement pattern is judged, if the velocity filtering value is in the near-zone measurement pattern, after a frequency spectrum of the echoes is obtained through FFT operation, the Chirp-Z method is used for thinning spectral lines nearby the Doppler velocity to obtain an echo frequency spectrum, and if the velocity filtering value is in the far-zone measurement pattern, the echo frequency spectrum is obtained through the FFT operation, and finally the echo frequency spectrum is subjected to smoothing and envelop interception to obtain a frequency value corresponding to a beam center, so that the velocity value is calculated; finally, the Kalman filtering method is adopted to track the velocity, and the velocity, acceleration and other information at the next moment are predicted. By means of the area target echo beam center velocity measurement method, the requirements for a large dynamic range and high accuracy are met, and measurement accuracy is improved.

An all-fiber Doppler lidar wind field detection system comprises a laser emission system, an optical receiving system, a frequency discrimination and optical detection system and a signal processing system, wherein the frequency discrimination and optical detection system is connected with the signal processing system; the laser emission system and the optical receiving system are connected with the frequency discrimination and optical detection system through multi-mode/single-mode converters; the laser emission system emits laser light into the atmosphere; the optical receiving system receives backscattering light of atmospheric molecules and couples the backscattering light into multimode fibers, then, the backscattering light is fed into the signal processing system after entering the frequency discrimination and optical detection system for processing through the multi-mode/single-mode converters, and wind speed information is obtained after the backscattering light is processed. A fiber M-Z interferometer is used as a frequency detector, the wavelength range is wide, the selectivity of a laser light source is high, the ability to resist external interference is high, and spectral resolution and light splitting efficiency are high; in this way, the stability of detection is improved, detection accuracy is high, and the all-fiber Doppler lidar wind field detection system is convenient to use.

The invention provides a raster imaging spectrometer which comprises a preposed receiving optics unit, a light split imaging unit comprising an entrance slit, a plane mirror, a collimating-focusing system and a raster, and a spectral signal processing unit comprising an area array photoelectric detector and a signal processing system. The entrance slit is arranged at the focal point of an emergent light ray of the preposed receiving optics unit; the emergent light ray of the preposed receiving optics unit penetrates through the entrance slit to be capable of reaching the reflecting surface of the plane mirror; the collimating-focusing system is arranged on the reflected light ray of the plane mirror and is coaxial with the raster; the reflected light ray of the raster on the plane mirror passes through the collimating-focusing system-collimated emergent light ray; the area array photoelectric detector is positioned at the focal point of the diffracted light ray of the emergent light ray focused by the collimating-focusing system, of the raster; and an output end of the area array photoelectric detector is connected with an input end of the signal processing system. The raster imaging spectrometer provided by the invention has the advantages of being simple in structure, high in stability, high in spectral resolution, small in volume, low in price, capable of planar imaging, etc.

The invention discloses a method for reconstructing multi-spectral information calculation based on principal component analysis. The method comprises the following steps of: 1, acquiring two paths of multi-spectral images; 2, performing principal component analysis on the spectral information of sampling points of the multi-spectral images to obtain a principal component spectral vector basis; and 3, reconstructing the spectral information on the unknown spectral points according to the principal component spectral vector basis, red, green and blue (RGB) vectors which are acquired by a camera, an R channel integral curve of the camera, a G channel integral curve of the camera and a B channel integral curve of the camera. By the method, multi-spectral information can be more simply and more quickly reconstructed; the required scene spectral sampling points are few; and principal components of the multi-spectral information can provide instructive significance for related research.

The invention provides a microwave high spectrum radiometer. A rotatable platform is used to adjust a rotation angle of a microwave reflector device to change working wave beam directing of a receiving antenna device to realize measuring of atmospheric radiation spectrum. Incident microwave energy is reflected in the receiving antenna device through the microwave reflector device, and directing of the antenna wave beam is changed by rotating the microwave reflector device by 360 degrees. Elevation of the antenna wave beam can be accurately measured by an elevation positioner, and when a computer or a remote computer issues a series of observation instructions of the microwave radiometer, the rotatable platform device instructs the microwave reflector device to rotate to a specified elevation and an azimuth. A microwave high spectrum digital processing and control device enables a microwave high spectrum receiver device to be arranged into a needed passage, simultaneously orders the microwave high spectrum receiver device to start to observe the sky, and then transmits observed data to the computer or the remote computer to be inverted into meteorological parameter curves.

The invention relates to a space-time refined soil organic matter content remote sensing dynamic inversion method. The method comprises the steps that the Sentine-2 and Sentine-3 are selected as remote sensing image sources, and a Gram-Schmidt spectrum sharpening image fusion method is used for image fusion, so that the image data used by the method has high space, high time and high spectral resolution. An inversion model framework containing the fused image multiband reflectivity and the multiple vegetation indexes is constructed, an optimal index combination mode is selected from an index selection pool through methods such as relation fitting, selection comparison and autocorrelation verification, and an image inversion method which is based on image fusion and can capture space-time change characteristics of soil organic matter most effectively is constructed and formed. According to the soil organic matter content remote sensing inversion method, the high spectral resolution andthe high space-time precision are both considered, a space-time refined soil organic matter content change diagram in the regional scale can be obtained, and the important basic data and the decisionsupport are provided for exploring the change trend of the farmland productivity so as to accurately guide the agricultural production.

The invention relates to an optical system and a design method for a large caliber grating imaging spectrometer. The invention solves the problem of excessively low energy utilization rate of the grating imaging spectrometer by adopting a large caliber telescopic objective. Due to the catadioptric configuration of an improved gassegrain system, the invention solves the problems of excessively large barrel length and excessively large volume of a large caliber transmission-type telescopic objective and ratio imbalance of a complete instrument formed after the large caliber transmission-type telescopic objective is combined with a spectral imaging system. The large caliber telescopic objective is combined with the spectral imaging system with a convex surface grating to form the optical system for the large caliber grating imaging spectrometer. The optical system has a good aberration correction effect in the broad band range and obtains high imaging quality. When the telescopic objective is matched with the spectral imaging system in a relative aperture mode, the value aperture of the spectral imaging system is greater than that of the telescopic objective, so that the optical system is effectively prevented from generating vignetting. According to the invention, an aspherical mirror is not adopted in the whole optical system, so that the processing difficulty and the cost of the whole optical system are reduced. The invention is suitable for the technical field of an imaging spectrum.

The invention relates to the field of hyperspectral imager technology, in particular to a hyperspectral full polarization imager based on acousto-optic filtering and electro-optical phase modulation. The hyperspectral full polarization imager is an imaging device combining hyperspectral imaging and full polarization imaging, and relates to a method for simultaneous detection and acquisition of the space, spectral and polarization information of an observed object. The hyperspectral full polarization imager is based on an acousto-optic tunable filter for splitting and a DKDP longitudinal electro-optical phase modulator for polarization detection; and comprises a front imaging lens used for collection, collimation and contraction of radiation, reflection, scattering and transmission light of the object under test and primary imaging to an AOTF; DKDP longitudinal electro-optical phase modulators for phase modulation; the AOTF for filtering and polarization detection; a light shielding plate for shielding 0-level and +1-level diffracted light through the AOTF; a secondary imaging conduction lens for secondary imaging of -1-level diffracted light to a planar array imaging CCD; and a control computer. The invention is mainly used in the field of a hyperspectral imager.

The invention discloses a wide-view-field chromatography hyperspectral microscopic imaging method and device based on space-time focusing, and belongs to the technical field of microscopic spectral imaging and analytical chemistry. According to the method, ultra-short pulse lasers are generated through an ultra-short pulse laser source, focusing lines are generated in a sample through space-time focusing, excited fluorescence is collected, stray light is filtered out through con-focal optical slits, spectral information (x, lambda), of the sample is acquired through fluorescence spectral information collecting, and finally sample (x, lambda, y, z, t) five-dimensional information is acquired through three-dimensional space scanning and delayed scanning. The device comprises the ultra-shortpulse laser source, a light beam conversion system, a line scanning system based on space-time focusing, an optical microscopic system and a filtering and synchronous spectrum con-focal detection system. Acquisition of the spectral information in the filtering and synchronous spectrum con-focal detection system is synchronous with line scanning trigger signals in the line scanning system in combination with the space-time focusing technology. The method and device have the advantages of being wide in view field, high in space resolution, high in time resolution, high in spectral resolution andthe like.