68 results about "Ftir spectra" patented technology

The present disclosure relates to reduced false positive identification for spectral classification. A device may receive information identifying a result of a set of spectral measurements of a training set of known samples and a validation set of known samples. The device may generate a classification model based on the information identifying the result of the set of spectral measurements, wherein the classification model includes at least one class associated with a material of interest for spectrometric determination, and wherein the classification model includes a mismatch class associated with at least one material of no interest or a baseline spectral measurement. The device may receive information identifying a particular result of a particular spectral measurement of an unknown sample. The device may determine whether the unknown sample is included in the mismatch class using the classification model. The device may provide an output indicating whether the unknown sample is included in the mismatch class.

The invention belongs to the field of chemometric model generation for spectrometers. The invention relates to a computer-implemented method for generating a chemometric model for a spectrometer, the method comprising: a) receiving spectra of objects and object data associated with physical or chemical properties of the objects, b) augmenting the provided spectra and associated object data, c) generating at least two different candidate chemometric models, comprising d) training the candidate chemometric models using the augmented spectra and object data, e) determining a prediction accuracy of the trained candidate chemometric models, f) using the prediction accuracy to select a chemometric model among the trained candidate chemometric models, and g) outputting the selected chemometric model.

A spectroscopy system including a base station having a reflecting telescope and a laser light source coupled to the telescope, the laser providing an outgoing light signal; at least one Unmanned Aerial Vehicle containing a mobile retroreflector configured to receive the light signal from the laser and return a light signal back to the telescope; a detector to record the intensity of the returning light signal; and optical components for spectroscopic measurements, the optical components utilizing the intensity of the returning light signal, revealing the presence of a chosen narrow band for the purpose of detecting a target.

The present invention relates to a device for spectroscopic measurements, in particular X-ray diffraction (XRD), tem- perature-resolved second harmonic generation (TR-SHG) or infrared (IR) measurements, which prevents the formation of condensation (dew) or ice (frost) when carrying out spectroscopic measurements in sub-ambient temperature conditions and to a method of spectro- scopic measurements with said device.

The present application discloses an adjustable slit device for a spectrometer, which belongs to the technical field of optical analysis instruments. The adjustable slit device for a spectrometer effectively reduces the number of driving components in the adjustable slit device for a spectrometer by setting two sets of synchronization components. While ensuring the installation accuracy of the two sets of synchronization components, the size adjustment accuracy of the pinhole slit formed by the two sets of blades is effectively improved through the synchronous movement of the two sets of synchronization components. In addition, a set of adjustment driving parts is used to provide driving force, which effectively avoids the errors and assembly errors caused by the asynchronous movement of multiple driving parts in the related art. The smaller number of driving parts ensures that the overall volume of the adjustable slit device for the spectrometer is small and can be adapted to a wider range of scenarios. At the same time, the processing of the adjustable slit device for the spectrometer is convenient, the cost is low, and the assembly quality is high.

Abstract Apparatus and methods are presented for spectral domain optical imaging, in particular for single shot 3-D spectral domain imaging of the retina of the human eye. In certain embodiments one or more 3-D images across elongated areas of an object are acquired, with scanning perpendicular to the long axis of the elongated areas for imaging extended volumes of 5 the object. In preferred embodiments the captured light is sampled in the Fourier plane, in a dimension substantially perpendicular to the long axis, with a cylindrical lenslet array, while in other embodiments the captured light is sampled in the image plane. Apparatus and methods are also presented for hyperspectral imaging of the retina, with the illuminating beams preferably angled to suppress interference from corneal reflections. Apparatus and methods are 10 also presented for multi-wavelength wavefront sensing, with simultaneous capture of light in two or more paths with different delays. 5 1020 26 20 47 51 19 J un 2 02 6 A b s t r a c t 1 9 J u n 2 0 2 6 5 2 0 2 6 2 0 4 7 5 1 1 0

A monolithic LED IC die can include multiple emission regions independently operable by applying independent electrical input signals, such as to independently control light output from different individual ones of the multiple emission regions. Optics can include different spectral filters applied to the different light outputs from the different individual ones of the multiple emission regions, such as to define different spectral bands output by the different spectral filters. These different spectral bands can be differently encoded, and the encoded light can be used for enhanced spectroscopy. Additionally or alternatively, the different individual ones of the multiple emission regions can be selectively energized, such as to provide a tunable light source via the different spectral bands output by the optics. The monolithic LED IC die with the multiple emission regions can make the optics more compact, such as for a wearable or other compact device for spectroscopic measurement or analysis.

This invention relates to a gas absorption cell for spectral parameter measurement, its installation method, and measurement method, belonging to the field of spectral parameter measurement technology. The gas absorption cell includes a gas absorption chamber and light transmission chambers symmetrically arranged on both sides of the absorption chamber. The light transmission chamber includes a containment chamber and a vacuum chamber, with the vacuum chamber located close to the gas absorption chamber. The gas absorption chamber and the vacuum chamber are separated by a third or fourth window, and the vacuum chamber and the containment chamber are separated by a spacer. The containment chamber houses the transmitting or receiving unit of the absorption spectrometer. The gas absorption chamber is filled with the target gas for spectral parameter measurement. The invention employs a five-segment structure consisting of the gas absorption chamber and the containment and vacuum chambers distributed on both sides of it, eliminating the need for a light guide device, resulting in a simple structure and convenient operation.

This application is applicable to the field of spectral detection technology, and provides a spectral line intensity correction method, system, device and storage medium, including: obtaining plasma information of a sample; the plasma information of the sample includes the full width at half maximum of the plasma radiation spectrum of the sample, plasma event stream data, and the number of events generated based on the plasma event stream data; reconstructing a plasma image according to the plasma event stream data; forming a plasma shape contour based on the plasma shape contour features extracted from the plasma image, and calculating the area of the region enclosed by the plasma shape contour; inputting the area of the region enclosed by the plasma shape contour, the number of events, and the full width at half maximum of the plasma radiation spectrum into a spectral line intensity correction model to generate a corrected spectral line intensity. This application improves the accuracy of quantitative analysis of spectral line intensity in related technologies.

This invention discloses a purification method for isopropanol, a reagent for spectroscopic analysis. The method includes: S1 mixing industrial-grade isopropanol with an alkali metal compound, adjusting the pH to 7.0–8.0, and obtaining a neutralized filtrate through solid-liquid separation; S2 continuously adsorbing and removing impurities from the neutralized filtrate by passing it sequentially through a molecular sieve adsorption unit, a modified activated carbon adsorption unit, and a γ-alumina adsorption unit; S3 subjecting the adsorbed liquid to staged total reflux distillation, controlling the reflux ratio at 5–15:1 and the total reflux time at 1–3 hours, and collecting the top product; S4 filling and sealing the top product under inert gas protection. This invention achieves closed-loop control of the entire process by setting online conductivity and moisture sensors, infrared detection devices, and online concentration sensors at key nodes. This method has the advantages of high purity, low energy consumption, high recovery rate, and process controllability, and is suitable for the industrial production of high-purity isopropanol for spectroscopic analysis.

Aspects of the present disclosure include methods for spectrally parsing light of fluorophores having overlapping fluorescence spectra in a sample using adaptive measurement variances. A method according to certain embodiments includes detecting light from a sample particle comprising a plurality of fluorophores having an overlapping fluorescence spectrum with a light detection system, determining a measurement variance of the detection light for each particle, and spectrally resolving the light of each fluorophore in the sample by a weighted least squares algorithm using the measured variance determined for each particle. In some embodiments, a spectral unmixing matrix is calculated through a weighted least square algorithm using an adaptive measurement variance model. Systems and integrated circuit devices (e.g., field programmable gate arrays) for practicing the subject methods are also described. A non-transitory computer-readable storage medium is also provided.

The invention discloses a spectrograph light intensity correlation Mueller matrix four-element spectrum measurement method. According to the method, the relative intensity data [Iti, theta i] of light received by the ith pixel unit of the spectrometer CCD, which is obtained by a measuring device for the light intensity related Mueller matrix four-element spectrum of the spectrometer based on an angle scanning method, is substituted into a principle formula of the relative intensity of light received by the ith pixel unit of the spectrometer CCD. And traversing the range of [0, 2pi] where theta i is located, selecting four theta i values according to a certain rule, establishing an equation set with four Iti measured values corresponding to the four theta i values, solving and normalizing to obtain a Mueller matrix element related to the light intensity of the spectrograph corresponding to the wavelength lambda i. The measurement method is an external measurement method, and the spectrograph is not disassembled; all light intensity related Mueller matrix element spectrums are measured by adding a retardation curve of a 1 / 4 wave plate, and the method is not only suitable for a single spectrograph, but also suitable for a spectrograph system; the core optical device only uses the polarizer and the rotary 1 / 4 wave plate, the related hardware cost is low, and the method is simple and rapid; the environment adaptability is good.

The invention discloses an automatic spectrum calibration device and method for a grating type spectrometer, and relates to the technical field of spectrum calibration, and the device comprises a tunable laser, a wavelength meter, a power meter, a beam splitter, a rotary integrating sphere, and a computer measurement and control system. Software connection of the tunable laser, the wavelength meter and the power meter is realized through the computer measurement and control system, and an automatic calibration function is set. The tunable laser performs light splitting through the two beam splitters, one path of laser enters the rotary integrating sphere for spectrum calibration, the other path of laser enters the wavelength meter for measuring and controlling the wavelength of the laser and performing frequency stabilization on the laser, and the other path of laser enters the power meter for monitoring the output power of the power meter. A computer measurement and control system is used, and parameters such as an initial wavelength, a sampling interval and a termination wavelength are set to realize automatic spectrum calibration of the grating type spectrometer. According to the invention, spectrum calibration can be provided for various grating type spectrometers.

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 reduced misinformation identification for spectral classification. A device may receive information identifying results of a set of spectral measurements of a training set of known samples and a validation set of known samples. The device may generate a classification model based on information identifying results of the set of spectral measurements, where the classification model includes at least one category associated with the material of interest for the spectrometric determination, and where the classification model includes at least one classification associated with the material of interest for the spectrometric determination. The classification model includes a mismatch category associated with at least one of at least one material of uninterest or a baseline spectral measurement. A device may receive information identifying a particular outcome of a particular spectral measurement of an unknown sample. The device may determine, using the classification model, whether an unknown sample is included in a mismatch category. The device may provide an output indicating whether the unknown sample is included in the mismatch category.

The present application relates to a kind of spectral imaging systems based on annular gradient filter, including zoom modulation module, light splitting module, collection imaging module and image processing module.The system uses annular gradient filter as light splitting element, combines drive control module as the light splitting module for spectral imaging, while, annular gradient filter is arranged at the focal plane of zoom modulation module, avoid the size of imaging module to the size of annular gradient filter Limit, improve the light splitting precision.The system completes the wavelength matching reconstruction of image by area matching and edge interpolation, and generates three-dimensional spectral image quickly.The present application can be applicable to visible light, infrared band under the spectral gaze imaging based on annular gradient filter, with compact, stable, high precision, low cost and other advantages.

The present application is applicable to the field of spectral detection technology and provides a model training method, a material detection method, a system, and an apparatus, comprising: obtaining a sample training set; wherein each sample data in the sample training set includes plasma radiation spectrum data, plasma characteristic data, and sample label information corresponding to each sample; using the plasma radiation spectrum data and the plasma characteristic data of each sample as input and the sample label information corresponding to each sample as output, to train a neural network model; the plasma radiation spectrum data includes first plasma radiation spectrum data of each sample and / or plasma radiation spectrum data obtained after preprocessing the first plasma radiation spectrum data. The present application improves the accuracy of material classification.

A value document with a carrier element and a foil element arranged in a partial region of the carrier element. The carrier element has, at least in the partial region, a luminescence marker which is adapted to give off luminescence radiation which has at least a first wavelength and a second wavelength in each case in the infrared spectral region. The foil element has a reflection layer and a spectral selection layer. The selection layer is arranged between the carrier element and the reflection layer. The reflection layer is configured to reflect infrared radiation and the selection layer is configured to spectrally selectively inhibit transmission of infrared radiation. The inhibition of the transmission of the first wavelength and the inhibition of the transmission of the second wavelength differ by at least 10%.

The invention provides a cell for spectroscopic analysis, a spectroscopic analysis device, and a spectroscopic analysis method. In order to achieve high-speed measurement in a non-exposed environment by pressing a sample by a light-transmitting plate such as a glass plate to be flat, and to prevent the light-transmitting plate from cracking even when measuring a wide range of the sample and even when the light-transmitting plate is thin, a cell for spectral analysis is a cell (100) for holding a sample (S) for spectral analysis, comprises: a base (10) for supporting a sample (S); a sealing member (20) that surrounds the sample (S) on the susceptor (10); a light-transmitting plate (30) for sandwiching the sample (S) between the substrate (10) and the light-transmitting plate (30); and a decompression flow path (L) communicating with a sample space surrounded by the base (10), the sealing member (20), and the light-transmitting plate (30).

1. Name of the product in this design: Spectrometer. 2. Purpose of this design: For spectral detection. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The present application relates to a kind of light beam pointing stability large rotation angle tuning short wave infrared coherent light source, and the present coherent light source includes: pump laser, magneto-optical isolator, condensing lens group, two 45 ° reflector, optical parametric oscillator (OPO), optical filter, fixed right-angle prism and mobile right-angle prism.The pump laser is used to generate pump light;The magneto-optical isolator is used to ensure one-way transmission of laser;The condensing lens group is used to improve beam energy density;Two 45 ° reflector is used to fold pump light path;The optical parametric oscillator is used to generate coherent short wave infrared light;The nonlinear crystal is used to adjust the output wavelength of short wave infrared light source;The optical filter is used to block remaining pump light;Fixed right-angle prism and displacement right-angle prism are used to compensate the lateral displacement of output beam caused in the process of crystal rotation.The present application compensates the lateral displacement of light beam by moving prism, realizes the position of output beam unchanged in the process of large rotation angle tuning, ensures its directionality stability, and is suitable for spectral analysis, remote sensing and imaging and other needs.

The invention discloses a spectrum polarization coding metasurface device and a reverse design optimization method thereof, relates to the field of spectrum polarization imaging, and solves the problems of high calculation cost and low design efficiency of the existing spectrum polarization coding metasurface design technology. A spectral polarization coding metasurface device adopts a structural unit A and a structural unit B, and the two structures respectively adopt a double split ring structure and an L-shaped and split ring structure. A reverse design optimization method for a spectral polarization coding metasurface device is characterized in that a forward network and a reverse network are combined, the reverse network is used for carrying out collaborative optimization on initial structure parameters and correlation coefficients, and four groups of obtained optimized structure parameters are sent to a forward network module; and the forward network is used for predicting the structure parameters to obtain correlation coefficients of the initial structure parameters and the four optimized output structure parameters and spectral response results as reverse design optimization results. The method is suitable for the field of the spectral polarization coding metasurface and the design method thereof.

This invention relates to the field of detector operating temperature determination technology, and more particularly to a method for determining the optimal operating temperature of a spectrometer detector. The method includes the following steps: performing theoretical analysis to determine the signal-to-noise ratio (SNR) formula, analyzing the relationship between detector signal and temperature, and the relationship between detector noise and temperature, and theoretically calculating the SNR-temperature relationship; simultaneously performing laboratory measurements, including experimental setup and data acquisition and calculation; and finally, combining the theoretical calculations and the actual measured SNR results to determine the optimal operating temperature of the InGaAs detector. This invention can obtain the operating temperature at which the InGaAs detector achieves the highest SNR. When using the InGaAs detector for measurements, a temperature control module is used to stabilize the InGaAs detector at this temperature, resulting in better performance of the short-wave infrared spectrometer based on the InGaAs detector and improved instrument measurement accuracy.

Systems or techniques are provided for spectral analysis. In various embodiments, a system can comprise a memory that stores computer executable instructions and a processor that executes the computer executable instructions. The computer executable instructions can comprise a compression component that compresses the one or more unknown spectra, using an encoder, into one or more compressed unknown spectra in a latent space; and a search component that matches the one or more compressed unknown spectra with one or more compressed known spectra to obtain one or more candidate matches of the sample.

A method for obtaining a model for a spectrometer or spectroscope, wherein a model comprises a relationship between a spectrum of a gas mixture or gas and parameters of the gas mixture or gas includes acquiring a reference spectrum of a predetermined gas or gas mixture using the spectrometer or spectroscope and parameters of the predetermined gas or gas mixture, encrypting the spectrum and / or the parameters using a homomorphic encryption method, and analyzing the spectrum and parameters without decoding the spectrum, or parameters. The method also includes performing one or more of the following steps with respect to a model based on the analysis, wherein a model contains a relationship between the spectrum and the parameters of the gas mixture: selection of a model from a large number of models created in advance, adjusting a previously created model, and recreating a model.

The present invention relates to a measuring device (110) for a spectrometer apparatus (112), wherein the measuring device (110) comprises: (1) at least one object holder (114); wherein the object holder (114) is configured to receive an object (118); (2) at least one mounting unit (116); wherein the mounting unit (116) is configured to accommodate the spectrometer apparatus (112); wherein the measuring device (110) is configured to align at least one measurement position (120, 121) on the object (118) with respect to a measurement spot (124) of the spectrometer apparatus (112) to obtain at least one spectral information item at the measurement position (120, 121).

An optical filter (1), in particular a Mach-Zehnder interferometer, for suppressing or attenuating a Rayleigh elastic component in scattered light or reflected light, which filter (1) can be integrated in an active and / or passive photonic circuit and can be placed between a scattered light source (2) and a spectrum analyzer (3). The filter (1) comprises: at least one input (4; 52); at least one light splitting element (5) for splitting the scattered light into a first light beam (6) traveling along a first path (7) and a second light beam (8), separate from the first light beam (6), traveling along a second path (9), wherein the difference between the first path (7) and the second path (9), defined as a path difference ([Delta] L), is non-zero; at least one phase modulator (13) located at the first path (7) and / or the second path (9); a closed loop control system (14) coupled to the phase modulator (13); a light combining element (10) for combining the first light beam (6) output from the first path (7) with the second light beam (8) output from the second path (9), and a first output (11) and a second output (12) coupled to the light combining element (10) wherein the first output (11) is configured to propagate a first output signal (15), wherein the Rayleigh elastic component of the scattered light is attenuated or suppressed as a result of destructive interference of the Rayleigh elastic component between the first light beam (6) and the second light beam (8).

Tunable or swept cat's-eye lasers for spectroscopy that is adapted for direct mounting to a flow cell and / or includes an internal gas cell and is appropriate for installation in adverse environments and capable of automated alignment and installation in explosion proof enclosures.

The present disclosure comprises a method for obtaining a model for a spectrometer or a spectroscope, wherein a model comprises a relationship between a spectrum of a gas mixture or gas and parameters of the gas mixture or gas, in particular the composition and / or concentrations of individual components of the gas mixture, comprising: acquiring a reference spectrum of a predetermined gas or gas mixture by means of the spectrometer or spectroscope and parameters of the predetermined gas or gas mixture, in particular the composition and / or concentrations of concentrations of the individual components of the predetermined gas mixture; encrypting the spectrum and / or the parameters by means of a homomorphic encryption method; analyzing the spectrum and parameters without decoding the spectrum, or parameters; performing one or more of the following steps with respect to a model based on the analysis, wherein a model contains a relationship between the spectrum and the parameters of the gas mixture: i. selection of a model from a large number of models created in advance, ii. adjusting a previously created model, and iii. recreating a model. and a method for evaluating a spectrum of a gas or gas mixture detected by a spectrometer or spectroscope by means of the model obtained by the aforementioned method.