107 results about "Ftir spectra" patented technology

A spectrum acquisition method and device belong to the technical field of optics. The spectrum acquisition device comprises a light splitting unit, a first spectrum calculation unit, a second spectrum calculation unit and a processing unit, the light splitting unit is used for receiving a light beam from the light source, splitting the light beam into a first polarization component and a second polarization component which are different in polarization direction, transmitting the first polarization component to the first spectrum calculation unit, and transmitting the second polarization component to the second spectrum calculation unit. The first spectrum calculation unit is used for calculating the spectrum of the first polarization component; the second spectrum calculation unit is used for calculating the spectrum of the second polarization component; the processing unit is used for obtaining the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component. According to the spectrum acquisition device, the problem that the computational spectrometer cannot determine the spectrum of the light beam when the light beam is the non-polarized light can be solved, and the spectrum acquisition device provided by the invention can acquire the spectrum of the light beam when the light beam is the non-polarized light. The method is used for acquiring the spectrum.

The invention discloses a sample quantitative analysis method based on spectral analysis and a related device, which can be used in the field of spectral analysis, and the method comprises the following steps: firstly, obtaining to-be-analyzed spectral data of a to-be-detected sample; then, based on the to-be-analyzed spectral data and a plurality of known spectral data, determining a target matrix category corresponding to the to-be-analyzed spectral data through a clustering analysis method; and finally, performing quantitative analysis on the to-be-detected sample through a target analysis model corresponding to the target matrix category. The target analysis model is obtained by training known spectral data belonging to the target matrix category. Therefore, unsupervised clustering analysis is carried out on a large amount of spectral data to divide the matrix category, the number of clusters does not need to be predefined, matrix category labeling does not need to be carried out on the large amount of spectral data in advance, the influence of manual labeling errors on the accuracy of a matrix classification result can be avoided, the matrix category division accuracy is improved, and the accuracy of matrix category division is improved. The accuracy of a quantitative analysis result can be improved.

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 is applicable to the field of spectrum detection and analysis, and particularly provides a rapid nondestructive detection system based on fusion of near infrared spectrum and Raman spectrum, which comprises a detection device and an intelligent terminal, the detection device comprises an upper-layer container, and a replaceable sample storage container is rotationally arranged in the upper-layer container; two openings are formed in the middle-layer container, and glass gates are arranged on the two openings; one opening corresponds to a data acquisition port of the near-infrared spectrometer, and the other opening corresponds to a data acquisition port of the Raman spectrometer; an edge end is arranged in the lower-layer container; a data processing unit is arranged in the edge end of the lower-layer container, and the data processing unit comprises a data acquisition control module, a data modeling module, a model self-adaption module, a reasoning prediction module and an upper-layer sample rotation control module. By combining the advantages of two spectrum technologies, the defects of a single technology in sample detection are overcome, and the detection accuracy and efficiency are improved.

A photoacoustic sensor for spectroscopic gas detection includes a chamber to contain the gas; an excitation laser source that emits a modulated laser beam; a transducer, having a reflective portion, located inside the chamber; an interferometer having first and second arms and an output, the first arm ending in the transducer, and the second arm including an optical path changer element and an actuator connected to the optical path changer element to change the optical path defined by the second arm of the interferometer; a first polarizing beam splitter; a second laser source; a second polarizing beam splitter; a first detector; a second detector; an electronic circuit; and a feedback loop adapted to command the movements of the actuator in order to change and stabilize the optical path of the second arm, so that the difference signal is kept equal to a desired constant value during the gas concentration measurements.

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 invention relates to a generator for spectrometry. An HF plasma generator for generating an inductively coupled plasma in spectrometry comprises: a voltage supply device having a DC voltage source; an oscillator circuit connected to the power supply device for generating HF power; and a load circuit coupled to the oscillator circuit for generating plasma, the load circuit having at least one induction coil and one capacitor connected in parallel to the induction coil. According to the invention, the HF plasma generator, in particular the voltage supply device, comprises at least one controllable voltage source arranged in a branch of the oscillator circuit, wherein the controllable voltage source is designed to set a voltage applied to the load circuit and / or at least one potential difference between the induction coil and a spectrometer, in particular a cone of the spectrometer. The invention also relates to a spectrometer having an HF plasma generator according to the invention.

Techniques for controlling heat transfer or emission using spectrally selective transmissive substrates are provided. Each spectrally selective transmissive substrate may include a plurality of alternating stacked layers, where the spectrally selective transmissive substrate is generally at least 50% transparent on average across a long wavelength infrared wavelength range (8 pm to 13 pm), and greater than 30% reflective on average across infrared wavelengths outside the long wavelength infrared (LWIR) wavelength range. Such substrates may include polymer such as a polyolefin, a nylon, or a polytetrafluoroethylene (PTFE), and may include air voids with a lower refractive index than polyethylene, and / or particles with a higher refractive index than polyethylene, such as ZnO. ZnS. ZnSe, CuO, FeO, Si, etc. Particles sizes are typically selected to behave as an effective medium in LWIR wavelengths, which are 5-20x larger than the particles, while still providing either solar scattering or solar transparency as desired.

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.

The present invention relates to a Bloch surface wave exciter based on nanoparticles, which is used in a spectrometer, comprising a glass substrate and a Bragg reflection unit arranged on the glass substrate, wherein the Bragg reflection unit is formed by alternating stacking of high-refractive index medium layers and low-refractive index medium layers, wherein the top layer is a defect layer, and the surface of the top layer is provided with nanoparticles. The present invention also provides a corresponding spectrometer and a measurement method thereof. The Bloch surface wave exciter of the present invention enables the in-plane size of the spectrometer to reach the nanometer level, and can measure smaller light source signals. Moreover, the preparation method of the present invention is simple and low in cost. In addition, when the spectrometer of the present invention is used, the requirements for the incident spectrum are simple, and there is no requirement for the polarization of the incident spectrum. At the same time, the present invention only needs to take a back focal plane image once, which is not only simple to operate, but also saves time.

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.

A first luminescent material having a peak emission wavelength in the range of 1600-1900 nm includes a garnet phosphor co-doped with Cr < 3 + > and Tm < 3 + > having the general formula: (Gd < 3-u-y > TmyREu) [Ga2-a-b-d-eLuaCrbScdAle] {Ga3-cAlc} O12, where RE = La, Y, Yb, Nd, Ho, Er, Ce, Lu, Sc and 0 < = u < = 2, 0lt; y < = 1.5, 0 < = a < = 1, 0lt; b < = 0.3, 0 < = c < = 3, 0 < = d < = 0.5, and 0 < = e < = 1.8. A second luminescent material having a peak emission wavelength in the range of 1400-1600 nm includes a garnet phosphor co-doped with Cr < 3 + > and Ni < 2 + > having the general formula: (Gd < 3-u > REu) [Ga2-a-b-d-eNiaCrbLdAle] {Ga3-cAlc} O12, where RE = La, Y, Yb, Nd, Ho, Er, Ce, Lu, Tm, Sc and L = Ti, Zr, Hf, Sn, Ge, Si and 0 < = u < = 2, 0lt; a is less than or equal to 0.1, 0lt; b < = 0.3, 0 < = c < = 3, 0lt; d < = 0.15, 0 < = e < = 2. A light source comprises first and second luminescent materials and one or more semiconductor light emitting diodes arranged to excite light emission from the luminescent materials to provide short wavelength infrared emission in the range of 1300-2000 nm.

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 present disclosure is directed to an improved process that measures IFT of petroleum reservoir fluids (i.e., crude oil) using Fourier-Transform Infrared Spectroscopy (FTIR) measurements. FTIR spectra of a petroleum reservoir fluid sample are measured and processed to generate FTIR data that characterizes or accounts for the surface-active species of the petroleum reservoir fluid sample. The resulting FTIR data is input to a predefined correlation function that calculates IFT of the petroleum reservoir fluid sample given the FTIR data. This new technique helps minimize the time for experiment preparation and stabilization.

Systems and methods for spectrometry are disclosed. In some embodiments, the system comprises a Fourier Transform Spectrometer (FTS) comprising a waveguide and a delay element. In some embodiments, the method comprises determining a power spectral density of an input optical signal via the FTS.

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.

The present invention discloses a tunable and traceable spectral calibration device, which includes a tunable laser, an optical frequency comb frequency stabilization module, a power monitoring module, an integrating sphere, a DC motor, a computer, and a spectrometer to be calibrated. The tunable laser provides a continuous light source for spectral calibration; the optical frequency comb frequency stabilization module locks the output optical frequency of the tunable laser to the optical frequency comb frequency; the power monitoring module is used to monitor the output optical power of the tunable laser in real time; the integrating sphere and the DC motor are used to eliminate the speckle effect of the laser during spectral calibration; the computer is used to record spectral calibration data and algorithm processing; the spectrometer to be calibrated is used to provide a measured object. The spectral calibration device is suitable for high-precision, high-spectral resolution, and traceable fine spectral calibration measurement applications. The advantage is that the optical frequency comb frequency locking module is used to trace the light source frequency of the spectral calibration to the atomic time scale reference, thereby ensuring the high precision and traceability of spectral calibration from the source.

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%.

Automated Docking Station for Spectrometer and Associated Measurement Method. The invention relates to a measurement system (1) and the associated measurement method, the system comprising an FTIR spectrometer (2) including a tracker module (20), a protection device (3) comprising a housing (30) and a movable protection module (31) between a closed position (P0) and at least one open position (P1). For this purpose, the protection module (31) comprises a movable cover (310) rotating about an axis (A1) parallel to the main extension plane of an upper surface (30a) of the housing (30), so as to pass between the closed position (P0) and at least one open position (P1), and an actuator (311) configured to drive the passage between the closed position (P0) and at least one open position (P1). Figure for the abstract: Fig. 1A