58 results about "Spectral dispersion" patented technology

The invention relates to a method for detecting a marine corrosion primary process, which comprises the following steps of: constructing three vacuum chambers and connecting the three vacuum chambers by using vacuum pipelines to form a detection system; ultrafast femtosecond laser with the repetition frequency being 1 kHz, the single pulse energy being 6 mJ, the pulse width being 35 fs and the central wavelength being 800 nm is generated through a pulse amplifier; one beam of 2mJ enters a vacuum chamber pipeline to be transmitted as a pulse light beam for detection in the original process of ocean corrosion, the other beam of 4mJ is transmitted outside the vacuum chamber to be used as a pump pulse light beam, and 400 nm pump pulse laser is generated through frequency doubling of a BBO crystal; the pump light beam and the detection light beam are incident on a sample of a sample mechanism in the third vacuum chamber, then the pump light beam is blocked, and only the detection light beam is incident on the sample; xUV light beams reflected from the sample are subjected to spectral dispersion and then enter a CCD detector, and the dynamic response of the sample after being excited by the pump light is monitored by measuring the transmissivity, reflectivity or absorption change of the surface of the sample.

The invention mainly relates to the technical field of spectral data processing, and provides a spectral processing method suitable for a convolutional neural network in order to solve the problem that the classification or objective prediction accuracy of the convolutional neural network is not high due to the fact that spectral dispersion characteristic wavelengths are difficult to capture when the convolutional neural network processes one-dimensional spectral data. The core idea of the method is as follows: setting a target sample variable, screening out a wavelength points with high correlation with the sample target variable from M wavelength points of an original spectrum through a competitive adaptive reweighting algorithm based on the target sample variable as characteristic wavelength points, and setting the characteristic wavelength points as a fixed wavelength point combination; pre-processing the original spectrum according to a plurality of pre-processing modes; sorting the pre-processed fixed wavelength point combination of each spectrum and the other M-a wavelength points according to the generated K random sequences to generate spectrum matrix data; and training the convolutional neural network based on the generated spectral matrix data.

A hyperspectral imaging device includes an optical channel arranged to focus light at a first image plane. A spectrometer includes a slit formed at the first image plane to allow a slit-shaped portion of the light pass through. A dispersive element receives light from the slit and spectrally disperses it along a direction perpendicular to a width of the slit. A focusing lens focuses the spectrally dispersed light at a second image plane such that the spectral dispersion is imaged along a first axis thereof, and a spatial image of the slit width is imaged along a second axis for detection by a sensor. A sliding lens group between the optical channel and the first image plane moves to direct the incident light, scanning the entire image over the slit such that multiple frames acquired by the sensor each correspond to a horizontal line of the image.

The present invention relates to an optical or Raman micro-spectrometry apparatus (100) comprising an optical microscope objective (10) and an optical spectrometer (20). According to the invention, the micro-spectrometry apparatus comprises an astigmatic optical system (30, 31, 32) arranged outside the optical spectrometer (20, 21), between the microscope objective (10) and the optical spectrometer, the astigmatic optical system (30, 31, 32) being arranged and configured to form an astigmatic image of a light beam transmitted through the microscope objective (10) on the input slit of the optical spectrometer (20, 21), the astigmatic image being elongated by astigmatism in the height direction of the input slit, the optical spectrometer being able to spectrally disperse the astigmatic image and form a spectrally dispersed image of the field of view on the detector, the astigmatic optical system being configured to reduce an optical aberration of astigmatism of the optical spectrometer in the spectrally dispersed image.

A spectrometer comprising an optical input for receiving spectral light, a single photon avalanche diode (133), an array (131) of multi-photon detector elements (134), and a spectral dispersive optic (143) arranged to disperse the spectral light into a spectrum. The spectrometer further comprises a device (145) arranged to: direct the spectrum to both the single photon detector avalanche diode (133) and the array (131) of multi-photon detector elements (134); and / or selectively direct the spectrum to either one of the single photon avalanche diode (133) and the array (131) of multi-photon detector elements (134).

A hyperspectral imaging device includes an optical channel arranged to focus light at a first image plane. A spectrometer includes a slit formed at the first image plane to allow a slit-shaped portion of the light pass through. A dispersive element receives light from the slit and spectrally disperses it along a direction perpendicular to a width of the slit. A focusing lens focuses the spectrally dispersed light at a second image plane such that the spectral dispersion is imaged along a first axis thereof, and a spatial image of the slit width is imaged along a second axis for detection by a sensor. A sliding lens group between the optical channel and the first image plane moves to direct the incident light, scanning the entire image over the slit such that multiple frames acquired by the sensor each correspond to a horizontal line of the image.

An optical discrimination apparatus adapted for use in PCR testing and the like. The apparatus includes a multi-color light emitter to emit excitation light, a sample holder configured to hold dye-marked nucleic acid fragments in a PCR solution at a position configured to receive the excitation light along a first direction, light emission collection optics configured to collect scattered excitation light and light emission (fluorescent emission) from the sample holder along a second direction that is approximately orthogonal to the first direction, a spectrally-dispersive element configured to spectrally disperse scattered light and emission light, and a spectral detector configured to receive the separated emission light and excitation light on different photosites of the spectral detector. Systems and methods are provided, as are other aspects.

This invention discloses a telecentric dispersive objective lens for spectral dispersive beam focusing. The lens employs a hybrid spherical and aspherical structure. From the incident light side, the lens consists of an aperture stop, a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, and a seventh lens with positive optical power. The second, fourth, fifth, and sixth lenses are spherical lenses; the first, third, and seventh lenses are aspherical lenses, and all three satisfy the aspherical equation. Due to its reasonable optical power distribution, this imaging lens can achieve spectral dispersive beam focusing, and all wavelengths exhibit diffraction-limited focusing levels.

A method of analysis uses an analysis apparatus equipped with a plurality of wavelength-dispersive X-ray spectroscopy (WDS) spectrometers. The method starts with producing an X-ray spectrum by spectrally dispersing X-rays by the first spectrometer. The X-rays are spectrally dispersed by the second spectrometer and X-rays from a corrective element are detected out of the dispersed X-rays to obtain information about timewise variations of the intensity of the X-rays from the corrective element. The intensity of X-rays from an element under analysis within the X-ray spectrum is corrected based on the information. In the step of correcting the intensity of the X-rays, information about the intensity of the X-rays from the corrective element detected at the same timing as the X-rays from the element under analysis is obtained and the intensity of the X-rays from the element under analysis is corrected based on this information.

The invention discloses a snapshot type light field spectral imaging method and system based on a micro refraction and diffraction lens array. And the front optical system, the micro-refraction and diffraction lens array and the area array detector are sequentially arranged along the light path direction. A measured target is subjected to primary imaging through the front optical system and then is subjected to secondary imaging through the micro-refraction and diffraction lens array to the area array detector. Each sub refractive and diffractive lens on the micro refractive and diffractive lens array has a spatial amplitude-spectral dispersion coded modulation function, spatial amplitude modulation is carried out on an incident light field, and then axial dispersion imaging is carried out on the incident light field to an area array detector of a rear focal plane, so that a two-dimensional fuzzy aliasing image is formed. And processing through a light field spectral imaging reconstruction algorithm to obtain a light field spectral data cube of the measured target. The imaging system provided by the invention is compact in structure, the light field spectral image of the target can be obtained only through one-time integral exposure and calculation reconstruction, the angle and depth of spectral imaging are calculated and adjusted within a certain range, and the imaging system is suitable for complex and dynamic target scene detection.

The invention relates to the technical field of optical light sources, and discloses a wavelength-adjustable optical light source device and a wavelength adjusting method thereof. The device comprises a multi-wavelength monochromatic source array, a grating assembly, a matched optical element and an exit slit or optical fiber coupling output, the device is divided into a reflection type structure and a transmission type structure, the light source array is arranged on a spectrum focal plane according to a spectrum dispersion sequence based on the reverse application logic of a dispersion spectrometer, and the light emitting position is matched with the wavelength distribution of a dispersion system. The monochromatic light sequence switching emission or multi-wavelength combined emission can be controlled through an instruction, and switching is realized only through an electric signal and grating angle adjustment without mechanical motion. The device is compatible with a reflection type grating and a transmission type grating, adapts to ultraviolet to infrared broadband, has the characteristics of simple light path, low energy loss and high stability, and is suitable for scenes such as spectral analysis, optical communication, bioluminescence imaging and the like.

The invention relates to the technical field of spliced telescopes, and particularly provides a spliced mirror surface seamless spectral measurement method, which comprises the following steps: irradiating a spliced mirror surface by using incident light, selecting two sub-mirrors by using an aperture masking method, opening aperture channels of the two selected sub-mirrors, closing aperture channels of other sub-mirrors, and carrying out spectral measurement on the spliced mirror surface. Performing dispersion on two beams of reflected light reflected by the two selected sub-mirrors to obtain two beams of spectral dispersion light, performing interference on the two beams of spectral dispersion light, expanding interference fringes with different wavelengths in a direction perpendicular to dispersion, performing detection to obtain a two-dimensional interference spectrum, performing pose adjustment on the two selected sub-mirrors to realize spectrum alignment, and performing spectrum alignment. The spectrums of all the sub-mirrors of the spliced mirror surface are aligned through iteration, aperture channels of all the sub-mirrors are opened, and the seamless spectrum of the spliced mirror surface can be measured. According to the invention, the seamless spectrum of the spliced mirror surface with high signal-to-noise ratio, good continuity and resolution close to diffraction limit can be obtained.

The invention discloses a grating-lens array spectral imaging method, and particularly relates to the technical field of spectral imaging, the grating-lens array spectral imaging method comprises a focusing lens group, a mask, a micro-lens array, a grating-lens array and an image plane which are sequentially arranged along the light propagation direction, scene information is collected by the focusing lens group, focused at the mask and collimated by the micro-lens array, and the image plane is obtained. And the light is diffracted and focused on an image plane by the grating-lens array. A grating-lens array element is designed, a transmission type plane grating and a single-face micro-lens array are glued, independent spectral dispersion and imaging are carried out on parallel incident light, a diffraction element and a focusing device are integrated, and two-dimensional space information and spectral information of multi-view-field light can be obtained at the same time; the size of a spectral imaging system is reduced to 173.62 mm, the number of optical devices of an imaging spectrometer at spectral dispersion and focusing parts is greatly reduced, and integration of the optical system is facilitated.

A radiation modulation device is disclosed that is operable to receive spectrally dispersed broadband input radiation and to selectively transmit, diffract, or reflect at least a portion of the spectrally dispersed broadband input radiation to obtain spectrally configured radiation wherein the radiation modulation device comprises a plurality of individually configurable elements, each of the plurality of individual configurable elements comprises at least one configurable grating structure; and wherein each of the individually configurable elements is operable to controllably modulate a respective portion of the spectrally dispersed broadband input radiation by actuating the at least one configurable grating structure in a direction to obtain spectrally configured radiation, the direction includes at least one directional component parallel to a periodic direction of the at least one configurable grating structure.

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 concentrating photovoltaic / thermal system integrating spectral splitting and heat absorption with multi-level synergistic output includes: a Fresnel lens, a multilayer spectral splitting and heat-absorbing film, an upper flow channel, a transparent heat insulation layer, a photovoltaic cell, and a lower flow channel arranged sequentially along the incident light direction, as well as a circulating working fluid located in the upper and lower flow channels. This invention enables the photovoltaic cell to preferentially receive radiation within its effective response wavelength range and convert it into electrical energy, and to preferentially absorb long-wavelength radiation that is difficult for the photovoltaic cell to convert into electrical energy in the multilayer spectral splitting and heat-absorbing film and convert it into heat, thereby achieving synergistic output of spectral distribution, photovoltaic cooling, and cascaded utilization of heat.

This application discloses a hyperspectral imaging device based on focal plane modulation, relating to the field of hyperspectral imaging. The target object is positioned on the side of the front imaging system away from the micromirror array. The target object is imaged onto the surface of the micromirror array by the front imaging system. The micromirror array is controlled by scanning to sequentially perform focal plane modulation on the target object, obtaining each row of reflected light, which is then irradiated by a relay imaging system. The relay imaging system includes a filter array, comprising filters arranged sequentially. The number of columns of the filters is the same as the number of columns of the micromirror units. Each row of reflected light undergoes spectral dispersion by the relay imaging system to obtain multiple frames of images. The controller is used to stitch together the multiple frames of spectral images to obtain hyperspectral data. This application does not rely on the fabrication precision of the micromirror array, while simultaneously improving both spatial and spectral resolution.

The invention relates to a system (5) for compressing light pulses emitted by a light source (2), comprising a dispersive optical system (10) configured to receive an incident light pulse (100) having a right incident wavefront of positive spectral dispersion, said dispersive optical system (10) being designed to deliver to an object point (A) a temporally compressed light pulse (110) having an inclined wavefront, said dispersive optical system (10) being designed to angularly disperse a propagation direction of the incident light pulse via at most four diffractions depending on the spectral dispersion of the incident light pulse (100), so as to form, at the object point (A), the angularly dispersed and temporally compressed light pulse (110) having an inclined wavefront.

The present invention discloses a MHz frame rate high-speed spectral measurement system and method, which mainly solves technical problems such as the low frame rate of traditional spectrometers, the inability to capture spectral changes in high-speed dynamic processes in real time, and limited application scenarios. The spectral measurement system includes a slit, a first collimating reflector, a spectral dispersion element, a spectral signal amplification module, a spectral coupling module, a spectral acquisition module, and a data processing module; the slit is used to limit the incident space of the light beam and change its divergence angle; the first collimating reflector is located on the side of the slit away from the object to be measured; the spectral dispersion element is located in the reflected light path of the first collimating reflector; the spectral signal amplification module is located in the diffraction light path of the spectral dispersion element; the spectral coupling module, the spectral acquisition module, and the data processing module are arranged in sequence, and the spectral coupling module is used to focus the spectral band captured by the spectral signal amplification module to form a spectral image, which is collected by the spectral acquisition module and transmitted to the data processing module.

An optical scanner can include a sampler to receive a light beam and provide a sampled light beam including a portion of the light beam, a dispersive element to spectrally disperse the sampled light beam along a dispersion direction, one or more detectors to receive at least a portion of the sampled light beam dispersed along the dispersion direction, one or more acousto-optic deflectors (AODs) configured to deflect the light beam from the sampler, and a controller. The controller can determine a centroid of the sampled light beam dispersed along the dispersion direction based on a signal from at least one of the one or more detectors and generate a drive signal for at least one of the one or more AODs to deflect the light beam from the sampler along a selected deflection angle based on the centroid.

A spectroscopic ellipsometer includes a light source configured to emit light, a polarizer configured to polarize the light emitted from the light source, a substrate support supporting a substrate, a polarization analysis assembly that is rotatable and optically connected to the substrate support, and a spectroscope configured to disperse the light from the polarization analysis assembly, where the spectroscope includes a lens configured to change a propagation path of the light from the polarization analysis assembly, a line slit assembly including a slit extending linearly and configured to extract a portion of the light from the lens, a spectral dispersion device configured to disperse the light from the line slit assembly, and a plane detector optically connected to the spectral dispersion device and configured to continuously detect the dispersed light that is dispersed by the spectral dispersion device.

A hyperspectral imaging device includes an optical channel arranged to focus light at a first image plane. A spectrometer includes a slit formed at the first image plane to allow a slit-shaped portion of the light pass through. A dispersive element receives light from the slit and spectrally disperses it along a direction perpendicular to a width of the slit. A focusing lens focuses the spectrally dispersed light at a second image plane such that the spectral dispersion is imaged along a first axis thereof, and a spatial image of the slit width is imaged along a second axis for detection by a sensor. A sliding lens group between the optical channel and the first image plane moves to direct the incident light, scanning the entire image over the slit such that multiple frames acquired by the sensor each correspond to a horizontal line of the image.

An overlay metrology system may include a collection sub-system with an objective lens and detector located at a pupil plane. The system may include an illumination sub-system with illumination optics to direct one or more broadband illumination beams to an overlay target on a sample at incidence angles outside a numerical aperture of the objective lens, where the overlay target includes one or more cells having periodic features formed grating-over-grating structures. The system may further include a controller to receive pupil images of the cells from the detector, where a respective one of the one or more pupil images include first-order diffraction from at least one of the one or more broadband illumination beams, wherein spectra of the first-order diffraction is spectrally dispersed in the pupil plane. The controller may further generate an overlay measurement of the sample based on selected portions of the one or more pupil images.

Systems and methods are disclosed for topping detection. The system comprises: (i) a spectral dispersion element for: receiving and dispersing an optical channel signal superimposed with a topping (PT) signal; (ii) at least one photodetector array comprising a first plurality of photodetectors for receiving respective portions of the dispersed optical channel signal and converting the respective portions into a first plurality of respective electrical signals; (iii) at least one analog-to-digital converter (ADC) for converting the first plurality of respective electrical signals into a first plurality of respective digital signals; (iv) a digital signal processor for processing the first plurality of respective digital signals and extracting channel specific information included in the PT signal, and calculating a channel power based on the channel specific information included in the PT signal.

A hyperspectral imaging system includes an optical channel arranged to focus light at a first image plane. A spectrometer includes a slit formed at the first image plane to allow a portion of the light to pass. A dispersive element receives light from the slit and spectrally disperses it along a direction perpendicular to a width of the slit. A focusing lens focuses the spectrally dispersed light at a second image plane such that the spectral dispersion is imaged along a first axis of the second image plane, and a spatial image of the slit width is imaged along a second axis. A sensor at the second image plane detects the spectrally dispersed light. A rotating prism is located distally to the slit and rotates, thereby rotating the image at the first imaging plane so that the portion of the image transmitted into the spectrometer varies.

A spectrometer system is described. The system comprises a signal input port and a pump input port, respective signal and pump dispersion fibers, a nonlinear optical fiber section, and an output dispersion fiber. The dispersion fibers are configured to apply predetermined spectral dispersion on light input associated with signal and pump inputs. The nonlinear optical fiber section is configured to receive dispersed signal and pump waves and enable nonlinear interaction between the signal and pump waves. The output dispersion fiber is configured to receive light resulting from said nonlinear interaction and apply predetermined dispersion to the received light, thereby providing output light having mapping between time and spectral components of the input signal. Wherein at least one of the signal input port and pump input port comprises temporal speckle generating unit configured to affect optical pulses passing through to induce temporal speckles within said optical pulses.

This invention discloses a method and system for optimizing the spectral dispersion coefficient of a greenhouse gas spectrometer before launch. The method includes: acquiring the instrument's linear function, initial dispersion coefficient, and laboratory direct solar observation spectrum; simulating the atmospheric absorption spectrum based on a radiative transfer model and performing convolution processing using the instrument's linear function; screening for positionally robust reference absorption lines through environmental parameter sensitivity analysis; fitting the observed spectrum and simulated spectrum to find peaks, extracting the center wavelength, and calculating the wavelength shift; establishing a polynomial fitting relationship for the wavelength shift to obtain the wavelength shift fitting coefficient; performing a difference calculation between the initial dispersion coefficient and the wavelength shift fitting coefficient, keeping higher-order terms unchanged, and outputting the optimized dispersion coefficient. This invention can effectively improve the wavelength calibration accuracy of the spectrometer before launch.

The present application relates to the field of optical metrology and imaging technology, and particularly to a color speckle measurement method in a laser display system and a measurement device using the method. The measurement method comprises: step a) imaging a target surface showing a color speckle pattern on a modulation plane of a spatial light modulator through an imaging module; step b) dividing the modulation plane into multiple spatial regions, sequentially selecting the spatial regions, guiding the light signals of the selected spatial regions into a dispersion element for spectral dispersion, and then collecting the dispersed spectral data by a first image sensor until the spectral data of all spatial regions on the modulation plane are collected; step c) reconstructing the collected spectral data into a three-dimensional hyperspectral data cube containing spatial and spectral dimensions according to the spatial position information corresponding to the spectral data; and step d) calculating and outputting speckle measurement indexes according to the three-dimensional hyperspectral data cube.

A hyperspectral imaging device includes an optical channel arranged to focus light at a first image plane. A spectrometer includes a slit formed at the first image plane to allow a slit-shaped portion of the light pass through. A dispersive element receives light from the slit and spectrally disperses it along a direction perpendicular to a width of the slit. A focusing lens focuses the spectrally dispersed light at a second image plane such that the spectral dispersion is imaged along a first axis thereof, and a spatial image of the slit width is imaged along a second axis for detection by a sensor. A sliding lens group between the optical channel and the first image plane moves to direct the incident light, scanning the entire image over the slit such that multiple frames acquired by the sensor each correspond to a horizontal line of the image.

A hyperspectral imaging system includes an optical channel arranged to focus light at a first image plane. A spectrometer includes a slit formed at the first image plane to allow a portion of the light to pass. A dispersive element receives light from the slit and spectrally disperses it along a direction perpendicular to a width of the slit. A focusing lens focuses the spectrally dispersed light at a second image plane such that the spectral dispersion is imaged along a first axis of the second image plane, and a spatial image of the slit width is imaged along a second axis. A sensor at the second image plane detects the spectrally dispersed light. A rotating prism is located distally to the slit and rotates, thereby rotating the image at the first imaging plane so that the portion of the image transmitted into the spectrometer varies.