43 results about "Spectral dispersion" patented technology

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.

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.

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.

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 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.

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.

The wide-spectrum multi-channel Thomson scattering diffraction grating spectrometer comprises an incidence and shaping unit, a light splitting unit, an imaging management unit and a detection unit which are sequentially arranged along a light path, the light splitting unit comprises a diffraction grating and an angle setting and repeated positioning mechanism; the detection unit comprises a multi-element detector array arranged along the spectral dispersion direction; an image surface of the multi-element detector array is provided with a non-detection area aiming at the intrinsic wavelength of the laser, and the angle setting and repeated positioning mechanism is used for adjusting the angle of the diffraction grating so as to position an image point of the intrinsic wavelength of the laser to the non-detection area. Through cooperation of the angle setting mechanism and the image plane non-detection area, image plane-level geometric isolation of the laser intrinsic wavelength is realized, strong intrinsic light interference is avoided fundamentally, and the signal-to-noise ratio is improved. And meanwhile, the detection channel can be reconstructed only by adjusting the grating angle, so that the adaptability and the operation and maintenance efficiency of the equipment to different diagnosis requirements are remarkably enhanced.

The invention relates to a large-numerical aperture wide-spectrum dispersion compensation objective lens for a spectrum interference device, which sequentially comprises a diaphragm, a first lens group and a second lens group from an image side to an object side, the diaphragm, the first lens group and the second lens group have the same optical axis, and the first lens group has positive focal power and is used for increasing the working distance of the objective lens and meeting the aperture requirement of a spectrum confocal interference system; the second lens group has positive focal power, bears most focal power and is used for flattening a field and correcting a secondary spectrum so as to eliminate dispersion of a reference arm of the spectrum confocal interference system. According to the invention, long working distance and flat field design are combined, full-pupil apochromatic in a wide spectrum band is achieved, processing and detection are easy, imaging quality is excellent, and the defect that a high-imaging-quality wide spectrum dispersion compensation objective lens combining large numerical aperture and long working distance cannot be realized in the prior art is overcome.

This invention discloses a mid-step grating spectrometer based on the principle of cross-dispersion and its fabrication method. The spectrometer includes a principal dispersive element, a transverse dispersive element, an area array detector, an optical fiber, and a slit. The principal dispersive element is a mid-step curved grating; the transverse dispersive element is a small-step curved grating. The mid-step curved grating and the small-step curved grating are used in combination to achieve spectral dispersion and point-to-point aberration elimination imaging. The area array detector is placed in the direction of the emitted light; the optical fiber is used to emit the light to be measured; the slit is located after the optical fiber and acts as an aperture stop. This invention uses a mid-step curved grating and a small-step curved grating to perform cross-dispersion, eliminating the need for collimating and focusing mirrors in traditional structures. The structure is compact, and high-resolution detection can be achieved, solving the problems of large number of components, high cost, and complex assembly in traditional cross-dispersion mid-step grating structures.

The invention relates to a method (500) of acquiring an interference signal, comprising: - splitting an incident light wave into a first light wave and a second light wave, the first and second light waves propagating in a first and second optical path of an interferometer, - adjusting an optical path difference between the first and second light waves, and - generating the interference signal by combining the first and second light waves on a detector, the method being characterized in that it further comprises: - measuring a spectral dispersion using the interference signal, and - compensating (505) the spectral dispersion by positioning a dispersion compensation plate made of a dispersive material at a compensation angular position with respect to an optical axis of the first or second light wave at an angle to satisfy a spectral dispersion criterion. The invention also relates to an interferometer device implementing such a method.

A line-scan Brillouin microscopy apparatus is configured to operate in a coaxial configuration. The line-scan Brillouin microscopy apparatus includes an illumination source that provides a P polarized illumination light beam for illuminating a sample. A first optical assembly provides the P polarized illumination light beam to the sample and collects initial Brillouin scattered light from the sample. The first optical assembly includes an optical component that converts the initial Brillouin scattered light to S polarized Brillouin scattered light. A second optical assembly is configured to receive the S polarized Brillouin scattered light from the first optical assembly. Characteristically, the second optical assembly is configured to induce a spectral dispersion. A detection unit is configured to detect a spatio-spectral pattern of the initial Brillouin scattered light. Advantageously, multiple points of the sample along P polarized illumination light beam are measured simultaneously.

The invention belongs to the technical field of imaging, and discloses a monochromatization method applied to wide-spectrum coherent diffraction imaging, which aims at a wide-spectrum coherent diffraction imaging experiment and reconstructs an obtained multi-wavelength diffraction pattern into a diffraction pattern under a single wavelength through spectral characteristic analysis. According to the method, based on a theoretical model in which a wide-spectrum diffraction pattern is a non-coherently superposed single-color wavelength diffraction pattern, the single-color wavelength diffraction pattern is accurately extracted in combination with a gradient descent optimization algorithm. According to the method, the dependence of traditional coherent diffraction imaging on a monochromatic source is broken through, and the calculation efficiency of monochromatization reconstruction is remarkably improved. The method is suitable for a coherent diffraction imaging scene of a wide-spectrum weak coherent light source, the problem of light intensity attenuation caused by a traditional light splitting scheme is effectively avoided, and a new solution is provided for high-resolution imaging under the weak light source. Meanwhile, the method is expected to be expanded to a desktop attosecond light source and other novel light source systems, and key technical support is provided for ultrafast process imaging under the attosecond scale.

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

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

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.

The present application relates to a kind of optical non-contact high steep profile measurement device, belong to the field of precision measurement.The device is mainly by precision motion execution module, profile surface detection module, precision displacement measurement module is constituted.The present application uses the spectral dispersion confocal displacement measuring head with certain installation inclination to realize the detection of high steep profile, utilizes two-dimensional orthogonal linear motion platform to carry the head and moves according to specified trajectory, is combined with the rotation of the measured part on precision rotary shaft to realize three-dimensional profile scanning.The device uses the displacement of the head by multi-axis double-frequency laser interferometric distance measurement of optical fiber light guide and reference datum frame technology to carry out high-precision measurement and realize Abbe error compensation.The present application measurement device structure simplifies, and can realize the ultra-precision measurement of high steep precision parts.

This invention discloses a system and method for flyby detection of asteroid hyperspectral polarization characteristics, belonging to the field of optical detection technology. The system comprises an orthogonal mirror module, a polarization spectral modulation module, a front imaging lens, a microlens array, a collimating lens, a spectral dispersive element, a focusing lens, an image detector, and a data processing unit. The detection system uses the orthogonal mirror module to enable a satellite platform to track and stare at the asteroid during high-speed flyby. It also introduces a microlens array to replace the slit in a traditional imaging spectrometer, and, combined with the polarization spectral modulation module, simultaneously acquires a two-dimensional image, hyperspectral, and polarization information of the target asteroid in a single measurement. This invention achieves multi-angle hyperspectral polarization snapshot imaging detection of asteroids during high-speed flyby.

The invention relates to the technical field of optical metrology and imaging, in particular to a color speckle measuring method in a laser display system and a measuring device applying the method. The measuring method comprises the following steps of: a) imaging a target surface presenting a color speckle pattern on a modulation plane of a spatial light modulator through an imaging module; b) dividing the modulation plane into a plurality of space regions, sequentially selecting the space regions, introducing optical signals of the selected space regions into a dispersion element for spectral dispersion, and acquiring spectral data after dispersion by a first image sensor until the spectral data of all the space regions on the modulation plane are acquired; the method comprises the following steps of (1) collecting spectral data, (2) collecting the spectral data, (3) reconstructing the collected spectral data into a three-dimensional hyperspectral data cube containing spatial dimensions and spectral dimensions according to corresponding spatial position information, and (4) calculating and outputting speckle measurement indexes according to the three-dimensional hyperspectral data cube.