50 results about "Ftir spectra" patented technology

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.

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 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.

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 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).

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.

A diagnostic testing method for a detector in a spectrometer is provided. The spectrometer includes a line spectral source configured to emit at least one branched spectral line pair from an excited species. The diagnostic testing method includes performing multiple detector diagnostic measurements and diagnosing the operational status of the detectors. Each detector diagnostic measurement includes: measuring the intensity of a first spectral line emitted by the excited species from the line spectral source using a detector; and measuring the intensity of a second spectral line emitted by the excited species from the line spectral source using a detector. The first and second spectral lines emitted by the excited species from the line spectral source form a branched spectral line pair, and for the multiple detector diagnostic measurements, the spectrometer is controlled to vary the intensities of the first and second spectral lines incident on the detector. For each of the multiple detector diagnostic measurements, the operational status of the detector is diagnosed based on the ratio of the intensity of the first spectral line to the intensity of the second spectral line.

A multimodal device for performing an examination of the fundus of a patient's eye is provided. The multimodal device includes an imaging module that generates an image representing a first region of the fundus, a spectroscopy module that generates a spectral analysis of a second region of the fundus, and an optical coherence tomography (OCT) module that generates depth-resolved information for a third region of the fundus. The second region is located within the first region, and the third region is located at least partially within the first region. Electromagnetic radiation travels from the fundus to the imaging module, the spectral module, and the OCT module along an imaging path, a spectral path, and an OCT path, with a common optical path segment leading to the fundus of the patient's eye.

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

This invention proposes a method for constructing disease screening models, a method for predicting diseases, and a device based on multimodal spectral contrastive learning, solving the problems of poor generalization performance and imbalanced screening indicators in existing models based on small sample spectral data. The invention includes: acquiring and preprocessing blood ATR-FTIR spectra; performing physically consistent sample augmentation on the training set; converting one-dimensional spectra into multi-view two-dimensional images using Gram angle fields and Markov transition fields, and fusing them into single-channel feature maps using PCA; constructing a Siamese network based on Vision Transformer; extracting features based on a frozen pre-trained encoder, training an extreme gradient boosting classifier (XGBoost), and searching for thresholds for prediction. This invention can overcome the overfitting problem of small sample spectral data, improve the sensitivity and specificity of early neurodegenerative disease screening, and can be applied to the intelligent and rapid classification and detection of mental and neurodegenerative diseases such as adolescent depression and Alzheimer's disease.

Embodiments herein describe spectroscopy systems that provide frequency, amplitude, and power-stabilized light to a vapor cell. An optical signal can be split into two optical paths where a first optical path includes an AOM to perform frequency and amplitude modulation to generate a pump optical signal and a second optical path that includes a variable optical attenuator (VOA) for generating a probe optical signal. These optical signals can then be provided into a vapor cell (also referred to as a gas cell) to perform spectroscopy.

A system provides for an ability to automatically identify one or more chemical components of a sample, especially a biological fluid sample, based on analysis of spectral data by at least one artificial intelligence module. The artificial intelligence module is able to be trained on a plurality of spectral data samples having known concentrations of individual chemicals and elements. The system is preferably used for spectral techniques such as UV / vis and near-infrared (NIR) spectrophotometry, but is also able to be used for other forms of spectroscopic techniques, including mass spectrometry, infrared (IR) spectrometry, X-ray spectroscopy, Raman spectrometry, or nuclear magnetic resonance (NMR) spectrometry.

An apparatus (1) for IR spectroscopic analysis and for determining damage to a surface (13, 15) exposed to measurement radiation (9) during IR spectroscopic analysis is provided, wherein the apparatus comprises: a radiation source (7) for generating measurement radiation (9); a sample container (21) for receiving a sample (16), wherein the sample container is at least partially delimited by the surface (13, 15); a detector (19) for detecting measurement radiation (17) after interaction with the sample (16), wherein the apparatus is configured to: measure an IR reference spectrum (29, 31, I V ) of a reference sample received in the sample container; evaluate the reference spectrum (29, 31, I V ) to determine an indicator (S, S 0 , S1) of damage, wherein the evaluation comprises integrating an amount based on the reference spectrum (29, 31, I V ) within a predetermined integrated spectral range (33), wherein the indicator is determined from the integrated value (S).

The invention discloses a high-flux linear multi-focus on-line laser spectrum analysis system with real-time calibration, and the system comprises a linear multi-focus light path modulator which can carry out the beam splitting modulation of an incident laser beam into a plurality of sub-laser beams with different propagation directions; the modulator can be realized by adopting a polyhedral transmission prism or a polyhedral reflection prism; the sub-beams are focused on the surface of a conveyor belt sample to form a linear multi-focus laser array, so that full coverage of the cross section of the conveyor belt is realized; a calibration standard sample is placed at the focus position of the edge of one side in the array and used for real-time calibration of the spectrum peak position. Sub-spectral signals generated by the multi-focus array have different propagation directions, are collected by each independent fiber core of the multi-fiber-core optical fiber and are transmitted to the spectral imager or the multi-channel spectrograph so as to obtain spectral information of each independent focus. By adopting the technical scheme, the problem of small coverage range of a single laser focus spectrum technology is effectively solved, and the coverage range and the detection flux of conveyor belt detection are remarkably improved.