42 results about "Attenuated total reflection" patented technology

The invention discloses a disease risk assessment method and screening device based on a multi-group student physical collaborative digital network, and relates to the field of intelligent medical detection. In order to solve the defect that multi-omics-level system collaborative analysis and robust risk assessment are difficult to realize in the prior art, the technical scheme provided by the invention is as follows: acquiring a plasma sample, acquiring a spectral signal by adopting an attenuated total reflection Fourier transform infrared spectrum, and establishing a plasma spectrum digital information space; the method comprises the following steps: constructing a biological collaborative digital network containing four nodes of protein, lipid, saccharides and nucleic acid based on pathophysiology priori knowledge, and defining node strength, edge weight and network collaborative efficiency; a health baseline configuration file is established by using a health sample, a standardized deviation score of a to-be-tested sample is calculated, a comprehensive risk score is obtained, a disease screening result is output in combination with a machine learning model, and digital evaluation of multi-omics collaborative characteristics is realized. The method is suitable for non-invasive rapid screening and risk assessment work of neurodegenerative diseases and mental diseases.

The invention provides a stone analysis method based on attenuated total reflection Fourier transform infrared spectroscopy. The stone analysis method comprises the following steps: S1, placing and fixing a stone sample to be detected; s2, acquiring an infrared light signal and converting the infrared light signal into original spectral data; s3, processing the original spectrum data to obtain a corrected spectrum; s4, taking the correction spectrum as input, obtaining a preliminary prediction category by using a partial least square discriminant analysis algorithm, and calculating a feature importance index of each wavenumber at the same time; s5, according to the feature importance index, using a random forest algorithm to obtain a secondary prediction category; and combining the accuracy rate of the partial least square discriminant analysis model and the accuracy rate of the random forest model to obtain a final prediction category. According to the method, an attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) technology is taken as a core, and an innovative thought of'pretreatment-free sample treatment + multi-algorithm collaborative analysis' is combined, so that a complete stone analysis process from sample fixation to clinical report output is constructed.

The invention discloses a method for rapidly identifying the type of yellow spots on the surface of a cigarette by using an infrared spectrum, and relates to the field of tobacco and cigarette products, and the method comprises the following steps: cutting a cigarette paper sample with yellow spots from cigarette paper of a yellow spot cigarette as a yellow spot sample; a cigarette paper sample without yellow spots is cut from the blank cigarette paper outside the yellow spot area to serve as an out-spot cigarette paper sample; the method comprises the following steps: respectively placing a yellow spot sample and an out-spot cigarette paper sample in an ATR part of an attenuated total reflection infrared spectrometer, collecting ATR-FTIR spectral data of the samples, and calculating an A value; comparing the A value of the macular sample and the A value of the out-of-spot cigarette paper sample with a database, performing auxiliary judgment by combining with the characteristic peak form, and judging the type of the macular according to a comparison result.

The present invention provides a sample stage with a built-in pressure sensor for attenuated total reflectance (ATR) measurements, wherein a detachable plate can be smoothly attached and detached. The sample stage comprises: a stage surface member 4 having an opening 2; and a detachable plate 6 held by the stage surface member 4 so as to close the opening 2. Pressure sensors 8 are arranged on the stage surface member 4 at three locations along the edge of the opening 2, a sample is placed on the surface of the detachable plate 6, and three projections 18 are formed at positions corresponding to the pressure sensors 8 on the side surface of the plate or the rear surface of the plate. Each pressure sensor 8 is brought into a sensing state by placing the projections 18 of the detachable plate 6 on the pressure sensors 8 of the stage surface member 4, and each pressure sensor 8 is brought into a non-sensing state by placing the projections 18 on a portion 22A other than the pressure sensors among the edge of the opening 2, with the detachable plate 6 being rotated by a prescribed angle.

To provide an antiadhesive material having good handleability and improved long-term antiadhesive properties.SOLUTION: The present invention relates to an adhesion-preventing material comprising a fiber sheet and an oil agent attached to the fiber sheet, wherein the oil agent comprises liquid paraffin and a surfactant. In the present invention, the adhesion-preventing material preferably has a peak derived from an oil agent in the vicinity of a wave number of 2860cm-1 in analysis by Fourier-transform ultraviolet spectroscopy-total reflection measurement method. In the present invention, the surfactant preferably has intermediate water in which an exothermic peak based on low-temperature crystallization of water is observed at 0 °C or lower in a temperature rising process in differential scanning calorimetry (DSC) in a wet state.SELECTED DRAWING: None

The invention provides a dispersant, a dispersion liquid, and a preparation method and application thereof. The dispersant comprises a copolymer containing a nonionic hydrophilic group and a long-chain hydrophobic group or a derivative thereof, an infrared absorption spectrum of the dispersant obtained by an attenuated total reflection method through Fourier transform infrared spectroscopy has an absorption peak at 1725-1740 cm <-1 >, the absorption peak exists at 2840-2960 cm <-1 >, and the peak width of the absorption peak at 2840-2960 cm <-1 > is 90-500 cm <-1 >; the dispersing agent is prepared from the following raw materials: an acrylic monomer, a long-chain acrylate monomer, an acrylamide monomer and a nonionic hydrophilic monomer. Dispersion liquid containing the dispersing agent provided by the invention has a good dispersion effect on polymer microsphere powder, diaphragm coating slurry prepared from the dispersion liquid has excellent stability, and a battery diaphragm prepared from the diaphragm coating slurry is low in air permeability increment.

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 invention relates to a method for testing the shear modulus of a polymer packaging material in a curing process, which comprises the following steps of: 1, obtaining polymer conversion rate data at different moments and clear curing process temperature parameters through attenuated total reflection Fourier infrared spectrum in-situ monitoring based on setting of curing process temperature parameters; step 2, based on the curing process temperature parameters determined in the step 1, obtaining associated data of shear modulus and time through a synchronous mechanical property test; and step 3, based on the conversion rate data in the step 1, the curing process temperature parameters and the shear modulus and time associated data in the step 2, obtaining corresponding polymer shear moduli under different conversion rates through multi-scale data fusion. The method has the beneficial effects that high synchronism and accuracy are achieved, full-period mechanical characterization is achieved, and a scientific basis is provided for internal stress prediction and demolding time determination in the composite material forming process.

System for simultaneous measurement Raman and mid-infrared absorption signals from a sample, the system comprising an ATR crystal adapted for holding a sample thereon, at least one Raman excitation light source for Raman excitation, at least one FTIR excitation light source for FTIR excitation, at least one photodetector configured for collecting signals with a wavelength comprised at least in one of the IR spectrum or the Raman spectrum, a wavelength-dispersive device, such as a spectrometer, for collecting Raman signals, an excitation lens, and collection optics comprising a first collection lens.

The invention relates to the technical field of oil wastewater separation and trace testing, and discloses an infrared spectrum quantitative method for trace hexafluorophosphate in polylactic acid fiber, which comprises the following steps: firstly, pressing loose fiber into sheets, and carrying out infrared spectrum testing by adopting an attenuated total reflection mode to effectively enhance the acquisition intensity and stability of infrared signals; secondly, in a data processing stage, through accurately extracting a characteristic infrared signal of hexafluorophosphate and systematically determining an optimal baseline correction method of an internal standard peak and a characteristic peak and an integral range selection skill, on the basis of a relation between a characteristic peak area ratio and the concentration, the detection sensitivity of the method is improved; according to the method, a quantitative model conforming to the Lambert-Beer law is established, matrix interference can be eliminated to the maximum extent, the accuracy of a quantitative result is ensured, and the problem that trace hexafluorophosphate lower than 5% on the fiber surface is difficult to accurately and rapidly quantify by an existing infrared spectrum technology and the accuracy of a quantitative result is low is solved. And a standardized analysis process for effectively eliminating matrix interference is lacked.

The invention discloses a water body COD (Chemical Oxygen Demand) detection method based on a terahertz time-domain attenuated total reflection spectrum. The method comprises the steps of standard water sample preparation, standard spectrum acquisition, spectrum pretreatment and modeling, to-be-detected water sample detection and result calculation. A terahertz time-domain spectroscopy system collects a spectrum in an attenuated total reflection mode, and a COD quantitative analysis and prediction model is established. Full-process automatic detection is achieved, the detection repeatability error is smaller than 3%, the detection time of a single sample does not exceed 5 minutes, the problems of interference of chloride ions and suspended particles and loss of volatile organic compounds in a traditional method are effectively solved, and the method is suitable for various kinds of water with high salt, high turbidity and the like. Toxic chemical reagents are not needed in the whole process, waste liquid containing chromium and mercury is not generated, the method is green and environmentally friendly, the detection cost and waste liquid treatment cost are remarkably reduced, technical support is provided for real-time monitoring of the water environment and pollution traceability, and the method has high anti-interference capacity, high applicability and sustainable development benefits.

The invention provides a liquid polycarboxylate superplasticizer quality identification method based on an infrared spectrogram, equipment and a medium. The method comprises the following steps: carrying out Fourier transform infrared spectrum scanning test by adopting an attenuated total reflection method to obtain an infrared spectrogram of a reference water reducer; selecting characteristic peak areas of S1081 and S1638 from the infrared spectrogram, and defining a peak area ratio A = S1081 / (S1081 + S1638); respectively adding equal proportion of water into the reference water reducing agent, recording the water adding rate Wi, calculating the peak area Ai of the reference water reducing agent after the water is added, and establishing a water reducing rate working curve according to the Wi and the Ai; obtaining an infrared spectrogram of the to-be-detected water reducing agent, calculating a peak area ratio As of the to-be-detected water reducing agent, and obtaining a water adding rate Ws of the to-be-detected water reducing agent according to the water reducing rate working curve; if Ws is less than or equal to 10%, the quality of the to-be-detected water reducing agent is qualified; if Ws is greater than 10%, the quality of the to-be-detected water reducing agent is unqualified. Through the infrared spectrogram and the working curve, time and labor are saved, the testing frequency is high, and rapid judgment of the quality of the polycarboxylic acid liquid water reducer is achieved.

This invention discloses a quality testing method for refined PLAH composite plasticizers. By integrating Raman spectroscopy-attenuated total reflectance infrared dual-spectral fusion, simultaneous thermorheological characterization, accelerated migration micro-model testing, and a multi-dimensional index model, this method overcomes the shortcomings of existing technologies that only detect chemical content, cannot reflect functional performance, and lack rapid evaluation capabilities. This method achieves integrated and rapid detection of molecular structure matching, phase stability, migration risk, and long-term performance of refined PLAH composite plasticizers, with a total testing cycle of ≤8 hours and a correlation between the test results and actual application performance ≥0.92. This method requires no complex pretreatment and combines the advantages of both destructive and non-destructive testing, making it suitable for online quality control in industrial production, warehousing acceptance, and application performance prediction. It provides key technical support for the optimization of the refining process and quality control of composite plasticizers for bio-based polylactic acid (PLA) materials.

The application discloses a terahertz time-domain attenuated total reflection method solvent water content detection system and method, relates to the online detection field of solvent water content by means of terahertz time-domain spectroscopy technology, and comprises a terahertz time-domain detection device for emitting a terahertz signal to an ATR sensor module, receiving a terahertz total reflection signal emitted from the ATR sensor module, and transmitting the terahertz total reflection signal to a data processing terminal; a first ATR sensor module for receiving a sample solvent to be detected and performing total reflection on the terahertz signal by means of the sample solvent to be detected; a second ATR sensor module for performing total reflection on the terahertz signal by means of a standard sample solvent; a sample solvent online liquid taking device for controlling the sample solvent to be detected to flow through the first ATR sensor module; and a data processing terminal for calculating the water content of the sample solvent to be detected according to the terahertz total reflection signal. The application can perform online nondestructive detection on the water content of a solvent.

A cured product of a resin composition according to the present invention includes at least silsesquioxane. When the average thermal expansion coefficient of the cured product at 30 to 200° C. is expressed as α1 [K−1], at least one of requirements α1 / α2≥10 and (α1−α2)2×108≥0.4 is satisfied, where a reference value α2 is 350×10−6 [K−1] or less. In the cured product, an absorbance derived from a siloxane bond, an absorbance derived from a hydrocarbon group, and an absorbance derived from a hydroxy group are respectively expressed as Ia, Ib, and Ic, the absorbances being determined by attenuated total reflection using a Fourier transform infrared spectrophotometer. In this case, requirements 0.09≤Ia / Ib≤3.0 and 0.04≤Ic / Ib≤1.0 are satisfied.

Devices and associated methods and apparatus for measuring sample material (e.g., tissue samples) use involve a spectroscopic system or device configured with a sample measurement device (e.g., an attenuated total reflectance infrared (ATR-IR) sample measurement device) that includes a crystal defining a sample receiving surface / interface that is operatively connected to an IR source and an IR detector. The sample receiving surface / interface facilitates the assessment of whether a fixative (e.g., formaldehyde) (and optionally, the amount thereof) is present in a sample material, such as a tissue sample. Measurements are taken at one or more locations within a sample placement structure / region, which can be provided in the form of a probe or raised piercing structure containing one or more ATR-IR (or other) sample measurement devices. The probe can include a piercing structure or mechanism at a distal (open) end of the probe that is configured to form a channel into a selected location (depth) within the sample material in a minimally invasive manner so that the sample is not severely damaged during testing.

The utility model relates to the field of infrared detection, in particular to a liquid pool for an attenuated total reflection accessory of an infrared spectrometer, which comprises a liquid bin, a liquid inlet joint, a liquid outlet joint, a first liquid inlet pipe and a first liquid outlet pipe, a first internal thread groove and a second internal thread groove are formed in the outer side wall of the liquid bin and communicated with an inner cavity of the liquid bin, a first through hole is formed in the liquid inlet connector, a second through hole is formed in the liquid drainage connector, external threads are arranged on the outer walls of the liquid inlet connector and the liquid drainage connector around the through holes, and the first liquid inlet pipe is installed in the first through hole. The first liquid discharge pipe is mounted in the second through hole; the liquid inlet connector is in threaded connection with the first inner threaded groove, the first liquid inlet pipe is communicated with an inner cavity of the liquid bin, the liquid drainage connector is in threaded connection with the second inner threaded groove, and the first liquid drainage pipe is communicated with the inner cavity of the liquid bin. The liquid inlet connector and the liquid outlet connector are in threaded connection with the two internal thread grooves respectively, so that the liquid inlet pipe and the liquid outlet pipe can be easily detached, and maintenance and replacement are facilitated.

This invention provides a pentaazole lead complex, its preparation method, and its application, relating to the field of laser-initiated ignition technology. The molecular formula of the pentaazole lead complex is Pb(N5)(N3), and its characterization is as follows: decomposition peak temperature: 120℃; characteristic wavenumbers detected by attenuated total reflectance infrared spectroscopy are: 3369.11, 3330.71, 3258.58, 3170.41, 1986.73, 1601.30, 1214.97 cm⁻¹. ‑1 The characteristic wavenumbers detected by Raman spectroscopy excited by 785 nm near-infrared laser are: 226.17, 573.48, 1184.74, 1342.18, and 1481.11 cm⁻¹. ‑1 Elemental analysis: PbN8: calcd N 35.10%, Found: N 35.15%. This invention discloses a novel pentazolium lead complex Pb(N5)(N3) and its preparation method. It has a low laser initiation threshold, is environmentally friendly, and experimentally determined to be successfully initiated at excitation energies of 3–100 mJ. The pentazolium lead complex described in this application does not contain ClO4. ‑ The pentazolium lead complex described in this application has higher energy than the conventional initiating explosive lead azide (Pb(N3)2), and can use a smaller amount of explosive under the same conditions.

The present application relates to the technical field of solution physicochemical test, and discloses a method for rapidly detecting nutrient content of synergistic high-nitrogen fertilizer, comprising the following steps: collecting undiluted original solution to construct an absorbance curve by attenuated total reflectance infrared spectroscopy, reading an initial transmittance voltage value, calculating a first-order time differential to extract a change rate parameter and adjusting a time window span in combination with a voltage value drift, calculating a second-order time differential and triggering filtering according to zero-crossing to correct the parameter and determine a slope mutation point value, and inputting the corrected parameter and the voltage value into an inversion relationship to calculate and output total nitrogen nutrient content, wherein the present application separates overlapping spectra by non-equilibrium dipole polarization time sequence difference, eliminates non-linear saturation, suppresses scattering interference of incompletely dissolved particles, and improves detection accuracy.

This ATR device is equipped with: a prism having a reflecting surface; a holding part that holds a sample containing a suspension on the reflecting surface; and an adjusting part that adjusts the flow state of the sample held on the reflecting surface. The adjusting part adjusts the flow state of the sample to a first flow state in order to acquire a first detection result relating to the sample in the first flow state, and adjusts the flow state of the sample to a second flow state in order to acquire a second detection result relating to the sample in the second flow state.

The present application relates to the technical field of road engineering, in particular to a desulfurization degree evaluation method of bio-desulfurized rubber powder for modified asphalt, which comprises Fourier infrared spectrum attenuated total reflection testing and EA element analysis testing on waste tire rubber powder and bio-desulfurized rubber powder, baseline calibration and smoothing processing on the transmittance spectrum, calculation of S-S bond and C-S bond correction peak area reduction rate, and calculation of S element content reduction rate, so as to calculate the desulfurization degree index DI value, which can quickly evaluate the desulfurization degree of bio-desulfurized rubber powder. The evaluation method and evaluation index proposed by the present application have the characteristics of short time consumption, convenient operation and high precision, can realize quick and accurate evaluation of the desulfurization degree of bio-desulfurized rubber powder in the screening stage of preparing desulfurized rubber powder modified asphalt materials, and can appropriately predict the physical properties of modified asphalt prepared by desulfurized rubber powder.

The invention relates to the technical field of test sample preparation, in particular to a method for extracting, preparing and detecting an organic clay complex in shale, which comprises the following steps: after more accurate organic clay complex particle extraction is carried out through three-level control, respectively collecting X-ray diffraction spectrum and attenuated total reflection infrared spectrum data of the organic clay complex; performing wavelet denoising process correction on attenuated total reflection infrared spectrum data of the organic clay complex, specifically, performing self-adaptive correction on a wavelet threshold value of each layer through baseline offset response represented by interlayer information change difference; therefore, the noise processing process has better adaptivity and robustness when reconstruction is carried out based on the corrected wavelet threshold, so that the finally obtained corrected infrared spectrum data is more accurate, and more accurate organic clay complex detection is carried out in combination with an X-ray diffraction spectrum.

A terahertz wave attenuated total reflection spectroscopic method, includes: disposing a measurement target S of which a volume is changed during a measurement period on a reflection surface 30C of a

To provide a laminated polyester film which has high recyclability and excellent quality stability.SOLUTION: A laminated polyester film has a water-soluble resin layer X containing acryl having a repeating unit represented by chemical formula (1) or chemical formula (2) as a main skeleton, on at least one surface of the polyester film, and satisfies the following (1) and (2). (1) An orientation parameter Rxy of a layer X represented by Expression Rxy=(Ax-Ay) / (Ax+Ay), which is measured by total reflection measurement Fourier transform infrared spectroscopy (FT-IR-ATR), is 0.02 or more and less than 1.00. Ax: absorption intensity in a direction with maximum CH deformation vibration. Ay: absorption intensity in a direction +90° from the maximum direction. (2) A hydrophilicity parameter Wx of a layer X represented by Expression Wx=Aph / Apb, which is measured by total reflection measurement Fourier transform infrared spectroscopy (FT-IR-ATR), is 2 or more and 10 or less. Aph: area of a peak derived from a hydrophilic group at 3,000 cm-1 to 3,600 cm-1. Apb: area of a peak of CH deformation vibration of a CH2 group at 1,446 cm-1.SELECTED DRAWING: None

The invention relates to a method for measuring the molecular content of H2O, HDO and D2O in heavy water by using an attenuated total reflection infrared absorption spectrum, which comprises the following steps: assembling a device comprising a Fourier transform infrared spectrometer and an ATR (Attenuated Transform Resonance) component, enabling interference light to pass through a reflecting lens to a crystal, and reflecting to a detector after total reflection; preparing a series of initial concentration heavy water solution standard samples; standing or heating the standard sample to isotope exchange equilibrium, and calculating theoretical concentration; testing the standard sample to obtain the characteristic peak areas of 1640 cm <-1 > (H2O), 1200 cm <-1 > (D2O) and 2500 cm <-1 > (O-D), and making a standard curve; and testing a blind sample and substituting into the curve to obtain the content. According to the method, the problems that the O-H peak of the high-concentration water sample is saturated and the molecular morphology of HDO and D2O cannot be distinguished in the traditional infrared spectroscopy are solved, accurate quantification is realized, and a reliable molecular level detection means is provided for the fields of nuclear industry and the like.

The invention relates to the technical field of electrochemistry, and provides a reaction tank and system for a magnetic field electrochemical in-situ infrared spectrum test. The reaction tank for the magnetic field electrochemical in-situ infrared spectrum test comprises a reaction tank module, an attenuated total reflection crystal module, an electrode and gas-liquid circulation module and a magnet module, and the magnet module is configured to adjust the magnetic field intensity of a working electrode; the reaction tank main body is communicated with the opposite tank main body through an ion exchange membrane, and the main direction of ion migration on the ion exchange membrane is set to be parallel to the direction of a magnetic field applied by the magnet module. Through the magnetic field intensity adjustable magnet module, accurate and controllable application of a magnetic field on the surface of a catalyst is realized, the influence of magnetic field Lorentz force on a key ion transmission process can be eliminated under a double-cell structure, and optical path stability and magnetic field uniformity are optimized for in-situ infrared spectrum testing. Therefore, the research difficulty of electrocatalytic reaction in-situ infrared characterization in a magnetic field environment is reduced.

Systems and methods presented herein generally relate to a tool for determining a refractive index of a formation fluid using attenuated total reflection. The tool includes a body having a fluid admitting assembly and a flow line that receives the formation fluid. The tool also includes two different crystals having faces in contact with fluid in the flow line. The tool further includes at least one light source coupled to the crystals and configured to direct light into the crystals. In addition, the wavelength, the refractive indices, and the angles of incidence are configured such that the light undergoes total internal reflection at interfaces between the crystals and the formation fluid. The tool also includes at least one light detector coupled to the crystals and configured to measure reflected light exiting the crystals. The tool further includes at least one processor coupled to the at least one light detector.

A non-specific reaction inhibitor, which is a copolymer comprising a constitutional unit A derived from 2-methacryloyloxyethyl phosphorylcholine and exhibiting a specific physical property X measured by Fourier transform infrared spectroscopy according to an attenuated total reflection method (ATR method), the non-specific reaction inhibitor being used in a use application of inhibiting a non-specific reaction when measuring an antibody or an antigen contained in a biological sample by mixing the copolymer with the biological sample.

The invention relates to a simple attenuated total reflection accessory suitable for in-situ infrared spectrum characterization, which comprises a shell, a detachable light path top plate, a silicon crystal assembly and a reflector assembly, and is characterized in that the detachable light path top plate covers the shell, a closed space is formed by the detachable light path top plate and the shell, and the detachable light path top plate comprises a fixed plate; the silicon crystal assembly is arranged on the lower surface of the fixing plate, and a sample cavity for containing a catalyst sample is formed in the silicon crystal assembly; the reflector assembly comprises four reflectors which are arranged in sequence, infrared light introduced from the infrared light inlet is incident upwards to the surface of the silicon crystal assembly through the two reflectors, and the infrared light reflected by the surface of the silicon crystal forms a total reflection path through the two reflectors and is finally emitted out from the infrared light outlet. Compared with the prior art, the invention provides a novel attenuated total reflection accessory with high sensitivity, quick response capability and cross-domain compatibility.

The disclosure relates to optical modules for spectroscopy. In one arrangement, a transmission body (4) is provided that defines a sensing surface (10) configured to contact a sample (8) during a spectroscopic measurement of the sample (8) by attenuated total reflection using optical radiation (13). The sensing surface (10) comprises a meta-surface structure (16) configured to apply a wavelength-selective enhancement of absorption of the radiation (13) by the sample (8) during the measurement.