60 results about "Spectroscopy methods" patented technology

Provided is a time-stretch spectroscopy device capable of restoring an original spectrum without using a high-speed modulation system or reception system even if temporally adjacent pulses overlap after stretching. This time-stretch spectroscopy device comprises: an optical modulator that performs intensity modulation in pulse units on a group of measurement light pulses, which are obtained by irradiating a measurement object having characteristics relating to light transmittance or reflectance with a group of light pulses; a pulse stretcher that performs time stretching on the group of measurement light pulses; and a signal processing device that, with the assumption that the measurement light pulses are sparse as data, performs a reconfiguration estimating pulse signal wavelength components corresponding to the stretched light pulses, which are obtained by individually time stretching the group of measurement light pulses, in light of a superimposition signal synthesized such that a temporal overlap occurs after the time stretching.

Method (100) of optical spectroscopy for analyzing a sample using an optical spectrometer (10), comprising: Obtaining a sample spectrum (101) of the sample using the optical spectrometer; Obtaining a blank spectrum (102) using the optical spectrometer, wherein the blank spectrum includes structured background radiation that correlates with the sample spectrum; Determining a cross-correlation (103) of the sample spectrum and the blank spectrum; Generating a mapped blind spectrum (105) by mapping the blind spectrum onto the sample spectrum based on cross-correlation; and Subtracting the imaged blank spectrum from the sample spectrum to produce a background-corrected sample spectrum (106).

A spectroscopic method of estimating the cadmium concentration in an aqueous sample including: preparing at least 5 aqueous calibration samples, each calibration sample including water, a pH regulator in an amount such that each calibration sample has a pH of from 8 to 10, an equal concentration of dimethylglyoxime and dissolved cadmium in an amount of from 0 to 12 μg / mL; and, measuring over optical path length (l) the absorbance for each calibration sample of radiation (R) having a wavelength of from 520 to 540 nm, thereby generating calibration data. The method further includes: forming a treated aqueous sample; measuring over the optical path length (l) the absorbance for the treated aqueous sample of radiation (R) having a wavelength of from 520 to 540 nm; generating test data; and, estimating the concentration of cadmium in the aqueous sample from the test data and the calibration data.

A Fourier transform spectrometer including an interferometer is provided. In one embodiment, an FT spectrometer includes an excitation light source, a beam splitter adapted to separate a metrology signal from the excitation light source and direct the metrology signal through an interferometer to a metrology detector. The FT spectrometer is additionally adapted to receive a spectral signal from the sample and pass the spectral signal through the interferometer to the spectrometer detector. The invention provides a method for correcting the movement of an interferometer reflector. In addition, a total spectroscopic method is provided that includes a spectral signal that includes Raman scattering, fluorescence, and near-infrared absorption components.

A method for determining a set of physical parameters of a sample, comprising the following steps: - A acquisition of a measured sample time trace Es(t), - B acquisition of a measured reference time trace Eref(t), - C determination of a broadened reference time trace, called Eref0(t), and determination of the discrete Fourier transform of the broadened reference time trace - D determination of a modeling of the impulse response of the sample in the frequency domain, called sample frequency model, from the Fourier transform of the broadened reference time trace and a physical behavior model of the sample, according to a set of physical parameters (pi), - E application of an optimization algorithm to the set of physical parameters (pi), comprising the following sub-steps: - El initialization of the physical parameters (pi), - iteratively implementing the following sub-steps: - E2 computation of the inverse discrete Fourier transform of the sample frequency model, called estimated sample time trace E est {p i}(t), - E3 computation of an error function (ε er {pi}) until obtaining a set of values of the physical parameters (pi opt ) that minimize the error function.

The present invention belongs to the technical field of lasers, and discloses a narrow linewidth frequency-stabilized laser device and its working method. The device includes a laser module, a frequency-stabilized optical path module, and a frequency-stabilized control module. The laser module is used to output a first continuous laser, a second continuous laser, and a third continuous laser based on fundamental frequency light. The first continuous laser, the second continuous laser, and the third continuous laser are homologous lasers with different wavelengths. The frequency-stabilized optical path module is used to perform modulation transfer frequency stabilization on the second continuous laser by using the modulation transfer spectroscopy method, and output a frequency-stabilized detection signal. The frequency-stabilized control module is used to extract an amplitude signal from the frequency-stabilized detection signal to obtain a frequency discrimination signal, and generate a feedback signal according to the frequency discrimination signal. Among them, the feedback signal is used to trigger the laser module to perform tuning control on the fundamental frequency light, so that the frequency discrimination signal is always controlled at zero. The present invention can simultaneously output three homologous continuous lasers with different wavelengths, and all three continuous lasers have the characteristics of narrow linewidth and frequency stability.

A spectroscopy method comprising detecting spectral light arising from excitation of a sample (124) with excitation light with a single photon detector element (133), detecting spectral light arising from excitation of the sample (124) with the 5 excitation light with an array (131) of multi-photon detector elements (134) and correlating the output from the single photon detector element (124) with the output from the two-dimensional array (131) of multi-photon detector elements (134). 10 Fig. 2a

The application discloses a kind of mid-infrared discrete time stretching spectrum method, its characteristics are as follows:1) prepare the double-color pulse light source with slightly different repetition frequency;2) the pulse of pulse light source 1 is output wavelength broadening and time stretching for the signal light of nonlinear difference frequency, and the pulse of pulse light source 2 is output power amplification, for the pump light of nonlinear difference frequency;3) the time-domain broadening spectrum optical sampling of signal light by pump light pulse, obtain the pulse sequence of mid-infrared discrete time stretching;4) mid-infrared discrete chirp pulse is measured through low bandwidth mid-infrared detector after passing through the sample to be measured, and absorption spectrum information is obtained.The application has the advantages of wide band, high speed and high resolution compared with prior art, and the measurement of mid-infrared spectrum is completed by means of low bandwidth single-point detector, without dispersion spectrometer element and mechanical scanning device, which solves the problem of lack of time and high dispersion time-domain stretching medium in mid-infrared band, and expands the application of time stretching technology in mid-infrared band.

The present invention discloses a method for screening grafting affinity rootstocks using a spectral method and a fluorescent probe. The method comprises the following steps: first, the rootstock and the scion cut surface are tightly fitted together and then a grafting clamp is clamped thereon to perform graft healing period management. Before measurement, the bottom of a hole plate of a grafted seedling is immersed in a fluorescein disodium salt solution, the grafted seedlings are fluorescently stained after grafting, and then a 365nm ultraviolet lamp is used to obliquely illuminate the surface of the junction between the grafted seedling rootstock and the scion. A micro-fiber spectrometer is used to receive the fluorescence reflection spectrum at the junction between the grafted seedling rootstock and the scion, the spectral data is processed, and the relative fluorescence intensity of the scion healing part in the scion area at a wavelength of 525nm is calculated to determine whether the scion and the rootstock are effectively connected, thereby determining the grafting affinity of the melon rootstock.

The application provides a fast random addressing scanning fluorescence correlation spectroscopy method and device thereof, comprising the following steps: S1, using a surface array camera to collect a series of wide field images under light sheet illumination, and obtaining a global low time resolution image fluorescence correlation spectroscopy diffusion image by calculation; S2, selecting an interested region according to the wide field fluorescence correlation spectroscopy image and setting a scanning array generation condition; S3, automatically generating a scanning array according to the selected arbitrary interested region and the set condition.The fast random addressing scanning fluorescence correlation spectroscopy method and device thereof provided by the application can solve the problem that the traditional scanning FCS cannot detect fast kinetics due to slow scanning speed, and can also solve the problem that the traditional scanning FCS cannot simultaneously monitor multiple regions due to the mechanical scanning of the scanning galvanometer.

An ATR apparatus includes a prism having a reflection surface, a holding unit holding a sample including a suspension on the reflection surface, and an adjustment unit adjusting a fluidal state of the sample held on the reflection surface. The adjustment unit adjusts the fluidal state of the sample to a first fluidal state in order to acquire a first detection result relating to the sample in the first fluidal state and adjusts the fluidal state of the sample to a second fluidal state in order to acquire a second detection result relating to the sample in the second fluidal state.

The present disclosure provides an integrating-sphere-assisted resonance synchronous (ISARS) spectroscopy method performed with an ISARS spectrophotometer, for example, a spectrofluorometer equipped with an integrating-sphere accessory. The methods and systems of the present disclosure utilize the ISARS spectrophotometer equipped with an integrating sphere to determine the ISARS spectral intensity, quantify the ISARS-based absorbance, and subsequently evaluate the sample's double-beam UV-vis absorbance spectrum (also known as the absorption extinction spectrum). This ISARS method enables quantitative separation of light absorption and scattering contribution to the sample UV-vis extinction spectrum measured with double-beam UV-vis spectrophotometer.

The present invention relates to a device and method for monitoring the cerebral blood oxygen saturation. The device comprises a power supply and modulation module, a light source module, a light guide module, an optical detection module, and a data processing and analysis module; under the action of the power supply and modulation module, light emitted by the light source module is transmitted into an area to be monitored within the brain of a test subject by means of a transmission optical fiber of the light guide module; after the light optically interacts with the brain tissue in said area within the brain of the test subject, a portion of the light enters the transmission optical fiber; the transmitted light is received by the optical detection module and processed by the data processing and analysis module to calculate and obtain continuous blood oxygen saturation data. The device and method for monitoring the cerebral blood oxygen saturation of the present invention adopt a spectroscopy method with a relatively direct measurement principle, are designed and developed using an optical fiber recording technology with a deep measurement depth and a minor impact on the activities of the test subject, and thus can be used for real-time blood oxygen saturation monitoring in an animal brain including the deep brain structure.

To achieve Ramsey spectroscopy while effectively suppressing the Doppler effect.SOLUTION: A Ramsey spectroscopic device 1 includes: an optical path 10; an optical path length stabilizing circuit 30 that stabilizes the length of the optical path 10; a modulator 20 that is optically connected to the optical path 10, generates, in a pulse shape multiple times, a resonant laser beam at a first frequency f1 that causes resonance of atoms, molecules, or ions, which are a spectroscopic target, and generates a non-resonant laser beam at a second frequency f2 that does not cause resonance; and a spectroscopic unit 200 that spectroscopically disperses the spectroscopic target. The spectroscopic unit detects a state change of the spectroscopic target according to the frequency f1 by irradiating the spectroscopic target with the resonant laser beam.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of determination of Hg < 2 + >, and particularly discloses a resonance Rayleigh scattering spectrum method for determining Hg < 2 + >, which comprises the following steps: preparing an Hg < 2 + > standard solution reaction system and a blank control system; calculating an intensity difference value delta I; drawing a working curve according to the relationship between the intensity difference value delta I and the concentration of the corresponding Hg < 2 + > standard solution; preparing an actual sample solution; calculating an intensity difference value delta I sample; and calculating the working curve and the delta I sample to obtain the content of Hg < 2 + > in the actual sample solution. According to the resonance Rayleigh scattering spectrum method for determining the Hg < 2 + >, the resonance Rayleigh scattering method for detecting the Hg < 2 + > is constructed by taking the nano-silver generated by a light wave method as a resonance Rayleigh scattering indicating probe and by virtue of an unmarked aptamer reaction (AptHg-Hg < 2 + >) to regulate an aggregation phenomenon of nano-silver (AgNPs) sol in a salt solution; the method is high in sensitivity, good in stability, simple and fast.

Provided are methods, devices, and systems for identifying the concentration of delta-9-tetrahydrocannabinol (Δ-9 THC) in a given sample. The system allows for in situ formation of a chromophore eliminating the use of chloroform, wherein said chromophore absorbance spectra is measured using a spectroscopy method within a light wavelength range. The system allows for calculating the concentration of Δ-9 THC using the linear relationship between the Δ-9 THC level and the intensity of the color change in the present tester. Said linear relationship is obtained because the tester of the present disclosure allows the chromophore formation reaction go to completion.

A photoelectron spectroscopy method includes: performing photoelectron spectrum detection on a target sample to obtain an initial photoelectron spectrum; selecting spectrum data points according to the initial photoelectron spectrum to obtain a photoelectron spectrum data point sequence; performing a first model parameter update on a preset initial photoelectron spectrum fitting model according to a preset expectation-maximization algorithm and the photoelectron spectrum data point sequence to obtain a first photoelectron spectrum fitting model; acquiring a target quantum effect constraint for the target sample; performing a second model parameter update on the first photoelectron spectrum fitting model according to a preset central field approximation relation and the target quantum effect constraint to obtain a second photoelectron spectrum fitting model; and performing spectrum fitting on the photoelectron spectrum data point sequence according to the second photoelectron spectrum fitting model to obtain a target photoelectron spectrum.

The invention relates to the field of water quality online monitoring and spectral measurement. According to the excitation-fluorescence detection spectrum device and the online spectrum detection method, under the condition of monochromatic excitation, a fluorescence original spectrum, a transmission original spectrum and a reference light intensity spectrum are synchronously collected in a sampling window, and dark spectrum deduction and reference normalization are carried out in combination with a dark spectrum baseline library to obtain a normalized fluorescence spectrum and a normalized absorption spectrum; generating a correction parameter record based on the spectrum sampling configuration parameter set, and performing correction processing on the two types of spectrums; and calculating a consistency index according to the spectrum section interval set, comparing the consistency index with a threshold value to generate a reacquisition plan, executing compensation sampling and spectrum section replacement to form a correction spectrum record, generating a correction spectrum abstract value and a storage index record, and updating the configuration library based on the quality identifier. According to the technical scheme of the invention, the synchronism and the anti-drifting capability are improved, the scattering / light intensity fluctuation influence is reduced, and adaptive compensation and traceable evidence storage are realized.

The present invention provides a near-infrared spectroscopy method, system, medium and device for qualitative discrimination of oil types. The method includes: obtaining the near-infrared spectra of a plurality of fuel samples to be tested, so as to obtain near-infrared spectral data; constructing a qualitative discrimination model through a neural network, the input of the qualitative discrimination model being the near-infrared spectral data, and the output of the qualitative discrimination model being the probability of belonging to each oil type and / or the probability of belonging to each brand; inputting the near-infrared spectral data of the plurality of fuel samples to be tested into the qualitative discrimination model to discriminate the probability of each fuel sample to be tested belonging to each oil type and / or the probability of belonging to each brand, and taking the highest probability of the fuel sample to be tested belonging to the oil type and / or belonging to each brand as the oil type of the fuel sample to be tested and / or belonging to the brand. The present invention is not interfered by the spectral information between different types of fuels, and improves the accuracy of oil type and / or brand identification.

The present invention provides a terahertz time-domain undersampling spectroscopy method and system for stress measurement. Undersampling is performed on a stressed specimen to obtain at least one set of terahertz time-domain undersampling spectral data. This data is then processed to obtain an error function describing the undersampling error caused by stress modulation. This error function is then processed to calculate the stress modulation coefficient and the change in the peak position of the terahertz signal. The specimen stress is then calculated based on the stress modulation coefficient and the change in the peak position of the terahertz time-domain spectrum. The present invention has the beneficial effects of effectively reducing the sampling window, minimizing delay line displacement, increasing measurement speed, and significantly shortening measurement time, while ensuring stress measurement accuracy.

The invention provides a laser-induced breakdown spectroscopy method and device for simultaneously detecting titanium / zinc content in sunscreen cream. The method comprises the following steps: step 1, preparing a sample tablet; 2, preparing a standard product tablet; 3, focusing a laser pulse to the surface of the sample tablet through an optical fiber laser, and collecting a plurality of spectral lines through a micro spectrometer; 4, analyzing the spectrum through a conventional calibration curve method LIBS and an improved single-point multi-line calibration method OP-MLC; according to the technical scheme, the method for detecting the titanium / zinc content in the sunscreen product through the LIBS technology is free of digestion, economical, simple and convenient.

The following description generally relates to techniques, devices, apparatuses, and methods used for screening and characterizing a plurality of samples within an experimental run by X-ray diffraction (XRD) experiments in which it may be useful to investigate a relatively large number of samples, several samples in situ, sequentially and / or simultaneously. The present disclosure concerns a multiwell device allowing, for example and without being limitative, high-throughput screening and in-situ characterization of materials which can be investigated using XRD-based techniques. The screening achievable using the technology that will be herein described does not require the time-consuming step of removing the material or the sample during an experiment, and is also compatible with various analytical techniques, which include but are not limited to the XRD-based techniques mentioned above. Another example of such analytical techniques includes spectroscopic methods (e.g., infrared spectroscopy or fluorescence- based screening techniques).

Methods and systems for predicting signal quality. An analytical instrument support system receives preliminary sample data collected from a short scan of a sample. The analytical instrument support system determines a maximum brightness intensity level from the preliminary sample data. The analytical instrument support system determines a performance level based at least on the maximum brightness intensity level. The analytical instrument support system determines an intensity-time model including a plurality of intensity levels and a plurality of exposure times, based at least on deviations of one or more intensity linear models, the one or more deviations associated with the determined performance level. The analytical instrument support device determines a first maximum intensity level based at least on a first corresponding exposure time and the intensity-time model, or determines a first parametric exposure time based at least on a first corresponding intensity level and the intensity-time model.

The invention discloses an exhaled air identification-oriented optical path infrared spectroscopy method and system, a hardware part comprises the steps of building a light source, emitting near-infrared light, colored light and ultraviolet light, realizing multi-light-source coupling enhancement in a form of forming a light source group, and transmitting light into a closed cavity. Gas in the closed chamber absorbs light intensity and generates an absorption spectrum, then the light is subjected to multi-element reinforcement of the double slits, comes to a grating sheet arranged on the receiver and is refracted to generate a dispersion phenomenon, the dispersed light enters the light intensity receiver and is finally transmitted into special spectrum detection software, and then data is cleaned and removed. Then, through PCA, K-means and other algorithms, features of different smells are obtained, and a high-identification clustering center and a database are formed for qualitative and quantitative analysis of other gases. The device has high precision and stability, can realize portable detection, and has wide application prospects in chemical plants, air pollution and other situations.

Absorbance spectroscopy methods and systems are disclosed including a spectroscopy analyzer, comprising: an optical element device positioned to receive an analysis light that passes through a sample of a fluid specimen from an illumination unit, the analysis light including first light in a first light range and second light in a second light range different than the first light range, the optical element device comprising: a housing assembly that defines an internal space; and a dichroic mirror-reflector within the internal space positioned to receive the analysis light, the dichroic mirror-reflector configured to filter the analysis light such that a first portion of the analysis light in the first light range is reflected off the dichroic mirror-reflector as a spectrometer light, and such that a second portion of the analysis light in the second light range passes through the dichroic mirror-reflector as a detector light.

In a method for the spectral analysis of a liquid mixture of substances consisting of known individual substances, a reference spectrum for the mixture is provided. This reference spectrum represents a target state of the mixture in which each individual substance is present at a target concentration. An actual spectrum of the liquid mixture to be analyzed is then generated. Finally, the concentrations of the individual substances in the mixture are determined based on an approximate spectral composition of the actual spectrum, derived from known pure spectra of the known individual substances and at least one compensation spectrum.

In a spectroscopy device (20) and a spectroscopy method, a coherent radiation source (21) is provided for illuminating a sample (11). A detection device (22) is configured to detect radiation (24) reflected from the sample (11) to the spectroscopy device (20) over a measurement interval. A verification device (30) is configured to check whether the relative movement between the spectroscopy device (20) and the sample (11) is sufficient to adequately average speckle patterns. The verification device (30) comprises at least one sensor (32) and a processing device (31).

A spectroscopic device 5 is for receiving light L1 that has undergone wavelength-decomposition in a predetermined direction by a spectroscopic optical system 4 including a spectroscopic element, and outputting spectroscopic spectral data of the light L1. The spectroscopic device 5 comprises: a CMOS image sensor that has a pixel unit 11 which has a plurality of pixels 21 for receiving the wavelength-decomposed light L1 and converting the same into an electrical signal, and in which the plurality of pixels 21 are arranged in a row direction along a wavelength decomposition direction and in a column direction perpendicular to the row direction; an identification unit 14 that identifies, as specific pixels 21K among the plurality of pixels 21, pixels 21 on which a spectroscopic spectral image 31 of the light L1 is formed; and a generation unit 15 that adds up the pixel values of the specific pixels 21K belonging to the same column, and that generates spectroscopic spectral data based on the result of the adding.

The invention discloses an electrochemical spectroscopy method for detecting different failure conditions of PEM water electrolysis. The detection method comprises the following steps: selecting a test amplitude; applying an excitation signal to the PEM water electrolysis hydrogen production system in a constant current mode through an electrochemical workstation capable of providing nonlinear spectroscopy analysis; carrying out steady state V-I test and electrochemical impedance and total harmonic distortion test on the PEM water electrolysis hydrogen production system; acquiring a response signal through a signal acquisition unit of the electrochemical workstation, analyzing the response signal, and converting the signal from a time domain to a frequency domain to obtain a corresponding detection spectrogram; and analyzing and comparing the fault spectrogram with a standard spectrogram, and determining a failure type according to different changes of total harmonic distortion in different frequency domain ranges corresponding to different PEM failure conditions. The PEM failure caused by hydrogen-oxygen blow-by, pressure change, temperature change and liquid inlet amount change of the PEM water electrolysis hydrogen production system can be effectively distinguished.

A spectroscopic method and system for simultaneously analyzing molecular structure and size, of a single compound or of a mixture (M) of different molecules (M1, M2). A liquid volume (V) is provided with the mixture (M) having an initial concentration difference (ΔM) between different sub-volumes (Vm,Vs) which are fluidly interconnected and arranged at different locations along a spatial coordinate (X). A time-dependent spectrum (α[t,vj) is measured of light (L) interacting with part of the liquid volume (V), while the concentration difference (ΔM) at least partially equilibrates by diffusion of the different molecules (M1, M2) between the different sub-volumes (Vm,Vs) along the spatial coordinate (X). The time-dependent spectrum (α[t,vj) comprises respective distinct spectral signatures (α1,α2) of the respective different molecules (M1, M2). Each spectral signature (α1,α2) can have a distinct time-dependent evolution (τ1,τ2) in the time-dependent spectrum (α[t,vj) resulting from respective distinct diffusion characteristics (D1,D2) of the different molecules (M1, M2).