1622 results about "Spectrometer" patented technology

The invention relates to the crossing field of precision agriculture and artificial intelligence technology, in particular to a soil component detection system based on machine learning and infrared spectroscopy, which is characterized in that a soil spectrum is acquired on site through a portable Fourier infrared spectrometer, and after pretreatment, feature vectors are constructed by fusing climate, soil and crop data; the deep learning decision-making module extracts spectral features by using one-dimensional convolution, fuses multi-dimensional information through an attention mechanism, synchronously outputs a fertilization scheme, crop suitability scores and soil improvement measures by a multi-task learning sub-network, and finally, verifies by combining an agronomic knowledge base so as to obtain a fertilization result. According to the method, a comprehensive decision report containing a quantitative fertilization formula, a crop suitability sequence and a soil improvement scheme is generated, precise agricultural guidance is realized, spectral features are automatically extracted by adopting a one-dimensional convolutional neural network, and a multi-modal data fusion and multi-task learning framework is combined, so that the system achieves relatively high precision in the aspect of soil nutrient prediction.

This invention relates to a laboratory spectrometer, comprising: a base; a motion assembly disposed on the base; a radiation source assembly including an X-ray source and a mounting frame, the mounting frame being fixed to the base and the X-ray source being fixed to the mounting frame; a curved crystal assembly including a spherical curved crystal and a positioning frame, the spherical curved crystal being fixed to the positioning frame and the positioning frame being fixed to the motion assembly; and a detection assembly including a detector and a support frame, the detector being fixed to the support frame and the support frame being fixed to the motion assembly, the support frame also being used to fix a sample; the motion assembly is configured to move the spherical curved crystal, the sample, and the detector so that the X-ray source, the spherical curved crystal, and the sample are always aligned on a Rowland circle. In this laboratory spectrometer, the X-ray source is fixed, and only the spherical curved crystal, the sample, and the detector need to be moved during energy scanning, resulting in a stable optical path.

The invention discloses a visibility inversion method based on millimeter wave cloud radar and laser radar data fusion, and relates to the technical field of meteorology, and the method comprises the steps: guiding a millimeter wave cloud radar and a laser radar to carry out data correction and equivalent relation construction through employing a fog drop particle size distribution function measured by a fog drop spectrometer in a sample scene in advance; and then applying the correction coefficient and the equivalent function relationship to a target scene to perform multi-source data correction and fusion on the millimeter wave cloud radar and the laser radar and invert visibility. The method can fuse complementary advantages of the laser radar and the millimeter wave cloud radar; the introduction of the fogdrop particle size distribution function effectively avoids the distribution hypothesis of fogdrop shapes in the traditional model, can weaken the seasonal drift of the traditional empirical coefficient, significantly improves the accuracy and reliability of visibility inversion, and achieves the high-precision visibility monitoring under various weather conditions from clear sky to dense fog.

The invention relates to the technical field of vacuum measurement, in particular to a device for expanding the linear range of mass spectrometry measurement, which comprises a gas transmission pipeline, an electromagnetic valve, a small hole and a mass spectrometer, and is characterized in that the front end of the gas transmission pipeline is used for allowing a sample to be measured to enter, and the rear end of the gas transmission pipeline is connected with the mass spectrometer; the middle part of the gas transmission pipeline is divided into three channels, namely a first gas transmission pipeline, a second gas transmission pipeline and a third gas transmission pipeline; the first electromagnetic valve and the first small hole are sequentially arranged on the first gas transmission pipeline, the second electromagnetic valve and the second small hole are sequentially arranged on the second gas transmission pipeline, and the third electromagnetic valve and the third small hole are sequentially arranged on the third gas transmission pipeline. According to the method, manual dilution or segmented sample injection is not needed, a wide concentration range can be covered by single analysis, more than 60% of time cost is saved, and measurement in a dynamic range of 106 is realized.

The invention provides a ventilation system optimization method and system based on the air quality of an industrial aquaculture workshop, and relates to the technical field of environment regulation and ventilation system.The method includes the steps that aquaculture workshop gas is analyzed through an infrared spectrometer, the spectral intensity of the characteristic absorption wavelength of a target pollutant is obtained, and then the accurate concentration of the pollutant is analyzed according to the spectral intensity; and calculating a ventilation parameter reference value and controlling a fan to adjust the air supply amount. An air treatment device in the ventilation system can determine the optimal working time according to the air supply amount so as to decompose pollutants and continuously monitor the concentration of the pollutants at the inlet and the outlet of the device. Subsequently, the air quality deterioration index is predicted by analyzing the concentration change trend, and the current overall purification efficiency is calculated. When the purification efficiency deviates from the range or the deterioration index exceeds the threshold value, the running state of the device is dynamically adjusted and fed back to the system, self-adaptive optimization of the ventilation system of the industrial aquaculture workshop can be achieved, and it is guaranteed that the workshop air quality is stable and the purification efficiency reaches the standard.

The invention provides a neutron dose evaluation method and system based on mobile phone neutron activation product analysis, and the method comprises the steps: constructing an equivalent medium model for replacing a real mobile phone, and carrying out the neutron energy spectrum solving through the mobile phone activation product. The neutron energy spectrum can be reconstructed on site in daily scenes without professional equipment, such as villages, streets and shopping malls, so that the uncertainty of individual dose is reduced to a level equivalent to that of a laboratory spectrometer, the dependence on a multi-ball spectrometer, a TOF spectrometer and professionals is thoroughly eliminated, rapid and accurate measurement of the neutron energy spectrum and large-scale population dose evaluation are realized, and the accuracy of the neutron energy spectrum is improved. And a basis is provided for delimiting the influence range of the nuclear event, judging the event level of the nuclear event and formulating a hierarchical medical rescue scheme.

The invention discloses a helium detection device and method for the airtightness of a bonding interface and a bonding microcavity, and belongs to the field of the airtightness of MEMS devices. The device comprises a sample holder, a mass spectrometer, a molecular pump, a mechanical pump and other components, helium is used as detection gas, and the helium is leaked only through a bonding interface through a customized and processed test sample and sample holder structure, so that the interference of other leaks in a non-bonding area on a test result is avoided. The testing method comprises the steps of sample introduction, vacuum pumping, helium filling, signal detection, dynamic and steady state testing and the like, the helium leak rate is monitored in real time by combining with a helium mass spectrometer, and the minimum leak detection rate is that high-sensitivity air tightness detection is ensured. According to the method, the airtightness of the bonding interface can be independently evaluated, and a reliable basis is provided for development of a novel bonding process. The method is suitable for air tightness detection and evaluation of the bonding process in MEMS device processing and manufacturing.

The invention discloses a distinguishing table type X-ray spectrometer and an X-ray absorption spectrum testing method, and relates to the technical field of spectral measurement. The high-resolution table type X-ray spectrometer comprises a sample signal source which is located in a Dowland circle and is used for generating X-rays; the exponential crystal is a bent crystal, the surface shape of the exponential crystal is defined by an exponential equation, so that different points on the curved surface of the crystal have different curvature radiuses and correspond to Rowland circles with different radiuses, each point on the exponential crystal is tangent to the corresponding Rowland circle, and the exponential crystal is used for performing monochromatization and focusing on the X-ray incident from the sample signal source; and the detector is positioned on a surface formed by the corresponding imaging points on each Rowland circle, and is used for receiving the X-rays which are monochromatized and focused by the index crystal and outputting corresponding light intensity signals. Therefore, through the cooperation of the index crystal and the multi-Rowland circle structure, the X-ray absorption spectrum test with high light receiving efficiency, high spectral resolution and wide energy spectrum range can be realized, and the comprehensive performance of the desk type spectrometer is improved.

The invention relates to the technical field of mass spectrometers, and discloses a mass spectrometer tuning method and device, electronic equipment, a storage medium and a program product, and the method comprises the steps: obtaining a tuning parameter data set of a target mass spectrometer, the tuning parameter data set comprising a plurality of tuning parameters and a parameter range corresponding to each tuning parameter; obtaining an optimization target of the target mass spectrometer; based on the tuning parameter data set, the optimization target and a pre-constructed constrained multi-target Bayesian optimization framework, predicting an optimal tuning parameter combination of the optimization target, the optimal tuning parameter combination being used for tuning the target mass spectrometer; the constrained multi-objective Bayesian optimization framework combines Bayesian optimization and multi-objective optimization. According to the invention, multi-objective optimization is carried out based on the constrained multi-objective Bayesian optimization framework, the optimal tuning parameter combination can be automatically generated, simultaneous tuning of multiple parameters of the mass spectrometer is realized, and the tuning performance and precision of the mass spectrometer are improved.

The invention relates to the technical field of molecular simulation, and provides a method for constructing a heavy component average molecular structure of thickened oil, which comprises the following steps: inputting parameters, generating a core aromatic ring unit, constructing an inner-layer aliphatic ring unit, constructing an outer-layer aliphatic ring unit, generating a side chain unit, and storing and outputting structural information. A plurality of molecular structures meeting experimental data are generated at a time through a traversal algorithm thought, composition characteristics of a heavy oil complex mixture are met, more available molecular structures are provided for molecular simulation, the accuracy and efficiency of molecular modeling are improved, the molecular structures completely meeting the experimental data can be rapidly generated, and the method is suitable for large-scale popularization and application. And only the mass spectrometer, the elemental analyzer, the nuclear magnetic resonance hydrogen spectrum and the infrared spectrum data need to be input, so that the experiment cost is reduced.

The invention discloses an ultratrace mercury isotope analysis method, and relates to the technical field of environmental analysis. The method comprises the following steps: purging a liquid sample to be detected by nitrogen in a stannous chloride atmosphere, and trapping and concentrating mercury into a gold trapping tube; pyrolyzing the pyrolytic gold trapping tube to release mercury vapor; pyrolytic mercury vapor and thallium isotope internal standard aerosol are mixed to serve as a sample injection sample, and the sample injection sample is introduced into a multi-receiver inductively coupled plasma mass spectrometry; acquiring a mercury instantaneous signal and a thallium isotope signal; and calculating the mercury isotope ratio by adopting least square linear regression fitting in combination with a thallium internal standard ratio correction algorithm. According to the method, the instantaneous mercury isotope signal is generated by online combination of gold trapping and multi-receiver inductively coupled plasma mass spectrometry, the instantaneous signal is strategically collected and processed, the determination concentration of isotope analysis can be greatly reduced, the sensitivity of the method is remarkably improved, and direct determination of mercury isotope composition in a water sample with the concentration of 10 ng L <-1 > is met.

The application discloses a testing device and testing method for hydrogen isotope permeation parameters of fusion reactor application materials, relates to material testing technology in the hydrogen field, and belongs to the field of material testing technology in the hydrogen field. The testing device for hydrogen isotope permeation parameters of fusion reactor application materials comprises the following: a membrane sample is installed in a membrane testing cavity to divide the membrane testing cavity into a gas inlet sub-cavity and a permeation sub-cavity; a gas inlet tank is selectively communicated with the gas inlet sub-cavity to supply testing gas; a collecting tank is selectively communicated with the permeation sub-cavity to collect outflowing gas; a vacuum pumping structure is used for pumping the gas inlet sub-cavity and the permeation sub-cavity; a heating structure is used for heating the gas inlet sub-cavity and the permeation sub-cavity; a high-resolution mass spectrometer is selectively communicated with the permeation sub-cavity, and gas selectively flows into the high-resolution mass spectrometer. The testing device for hydrogen isotope permeation parameters of fusion reactor application materials can control the gas pressure and temperature in the two sub-cavities respectively, thereby accurately determining the hydrogen isotope permeation parameters of the materials, and the precision is high, and the data resolution is excellent.

The invention relates to the technical field of electron energy measurement, and discloses an electron spectrometer and an electron energy spectrum measurement method and system.The electron spectrometer comprises a magnetic deflection unit used for receiving an incident to-be-measured electron beam, generating a magnetic field and applying the magnetic field to all to-be-measured electrons in the to-be-measured electron beam; the scintillator fluorescent screen is arranged at the downstream of the magnetic deflection unit and used for receiving the deflected electrons to be detected, and the electrons bombard the scintillator fluorescent screen and generate light spots; the optical acquisition unit is used for acquiring a light spot image on the scintillator fluorescent screen; and the signal processing unit is used for processing the light spot image so as to identify the spatial position information of the light spot in the light spot image and convert the spatial position information into electronic energy data. The method has the beneficial effects that the unification of high resolution and high measurement efficiency is realized, and the problem of signal accumulation under a high counting rate of a traditional direct measurement method and the inherent defect of low efficiency of a scanning type magnetic spectrometer are overcome.

The invention provides an anomaly diagnosis method for a nuclear power plant gamma energy spectrum continuous monitoring process, and the method comprises the following steps: S1, determining at least one target gamma characteristic peak which needs to be monitored under the current monitoring condition of a nuclear power plant, and calculating the anomaly of the target gamma characteristic peak based on the performance index of a gamma spectrometer and the expected energy of the target gamma characteristic peak; setting a parameter allowable range of each target gamma characteristic peak; the parameter permissible range at least comprises a peak center energy permissible range and a resolution permissible range; s2, acquiring a gamma energy spectrum output by the gamma spectrometer, and processing the energy spectrum to obtain actual measurement parameters of a target gamma characteristic peak; the measured parameters at least comprise a peak center energy measured value and a resolution measured value; s3, the actually measured parameters are compared with the corresponding parameter allowable ranges; and S4, if the actually measured parameter of any target gamma characteristic peak exceeds the corresponding parameter allowable range, determining that the state of the gamma spectrometer is abnormal. Automatic and real-time abnormity diagnosis of the monitoring state of the gamma spectrometer is realized.

A power supply device applies a voltage to a quadrupole mass filter. The power supply device has a main substrate and a wave-detection substrate. The main substrate includes a detector. The wave-detection substrate includes a wave detector and an identifier. The wave detector detects an AC component of a voltage to be applied to the quadrupole mass filter as a wave-detection voltage. The identifier outputs identification information of the wave detector defined in correspondence with the configuration of a rectifying device of the wave detector. The detector detects identification information output by the identifier, and supplies the detected identification information to a corrector that corrects a deviation of voltage caused by a leakage current of the rectifying device.

Systems and methods described herein provide for charge state control of multiply-charged anions in a front end, high pressure ion guide. In some example aspects, a mass spectrometer system is provided comprising a first vacuum chamber (121) maintained at a pressure above about 500 mTorr. At least one ion guide (106) is disposed within the first vacuum chamber, the at least one ion guide comprising a plurality of rods extending along a central longitudinal axis. A controller (193) is configured to adjust an amplitude of an RF voltage signal provided to the plurality of rods so as to alternatively operate the ion guide in a first mode of operation with a lower amplitude of the RF voltage signal so as to reduce the likelihood of charge reduction by electron detachment so as to substantially maintain the isotopic distribution of the ions during transmission of ions through the ion guide, and a second mode of operation with a higher amplitude of the RF voltage signal so as to increase the likelihood of electron detachment from ions being transmitted therethrough.

The invention discloses a printing color closed-loop control system based on spectral analysis, and relates to the technical field of computer processing, and the system comprises the following steps: S01, collecting the spectral reflectivity data of a plurality of key color blocks on a printed matter measurement and control strip in real time through an online high-speed spectrometer at the frequency of not less than 100 color blocks per second; s02, constructing a color prediction model, wherein the model receives the spectral reflectivity data and outputs absorption scattering characteristics, the spectral transmittance of ink and dot expansion, trapping and overprinting effects in the printing process; s03, setting a dynamic tolerance threshold value delta Et based on a chromatic aberration formula according to the color precision requirement of the printed matter, and judging the absorption and scattering characteristics, the spectral transmittance of the ink and a grading tolerance interval in which the dot expansion, trapping and overprinting effects in the printing process are consistent with visual perception; and S04, converting the spectral reflectivity data acquired in real time into a CIELAB color space irrelevant to equipment, and comparing the spectral reflectivity data with a preset standard color target value. According to the method, the problems of different standards and color drift caused by artificial experience difference and visual fatigue are solved.

The invention discloses a honey adulteration detection method, which belongs to the technical field of food detection, and comprises the following steps: collecting an absorbance spectrum of a honey sample by using a near infrared spectrometer; extracting characteristic absorbance values A < lambda > 1 and A < lambda > 2 at a 1450 nm water molecule absorption peak and a 1490 nm saccharide molecule absorption peak; the ratio R is equal to A lambda 1 / A lambda 2; and comparing the R with a threshold range of 0.85-1.15 of pure honey so as to judge whether the honey is true or false. The portable device comprises a sample bin, a near infrared spectrum module, a control unit and a human-computer interaction interface, wherein a rotatable sample table is arranged in the sample bin to accommodate a plurality of disposable sample cups. The method abandons a complex black box model, adopts a characteristic wavelength ratio method with clear physical significance, has the outstanding advantages of simple principle, rapid detection (less than 30 seconds), high accuracy, low cost, simplicity and convenience in operation and the like, perfectly solves the problems of expensive equipment, long time consumption, limited identification capability and dependence on professionals in the prior art, and has a wide application prospect. The method is especially suitable for market on-site rapid screening.

The utility model discloses a high-efficiency sampling device of an ultra-high performance liquid chromatography tandem mass spectrometer, which comprises a support, and a linkage adjusting mechanism is mounted in the middle of the top end of the support. The device has the beneficial effects that the linkage adjusting mechanism consisting of the racks, the sliding strips, the test tube placing seats, the clamping holes, the motor and the gear is mounted on the support, so that after a sample test tube on one test tube placing seat is used, the gear rotates under the action of the motor, and the gear can be matched with the corresponding rack after rotating; therefore, the used test tube placing seat slides out of the support, and the other test tube placing seat on which the sample test tube is placed is moved into the support, so that the sample test tube on the other test tube placing seat can be continuously fed when the sample test tube on one test tube placing seat is replaced, and the sample test tube on the other test tube placing seat can be conveniently replaced. The interruption of the sample introduction process of the ultra-high performance liquid chromatography tandem mass spectrometer is avoided, and the sample introduction efficiency of the ultra-high performance liquid chromatography tandem mass spectrometer is higher.

The invention discloses a device and a detection method for online oxidation-enrichment-reduction determination of nanogram-level nitrogen isotopes in a solid, and belongs to the technical field of nitrogen isotope analysis. The device comprises an oxidation system, a nitrogen oxide enrichment system, a nitrogen reduction system, a mass spectrum interface system, a stable isotope ratio mass spectrometer and pipelines for connecting all parts of the device. The device provided by the invention greatly reduces the quantitation limit of the nitrogen isotope in the solid sample, can realize high-precision determination of the nanogram-level nitrogen isotope in the solid sample, and has the advantages of simplicity and convenience in operation, high accuracy and the like.

One mode of a chromatograph mass spectrometer according to the present invention includes: a measurement unit (1) that includes a chromatograph unit (1A) and a mass spectrometry unit (1B) capable of performing MS / MS analysis, and collects chromatograph mass spectrometry data having three dimensions of time, m / z, and a signal intensity by repeatedly performing the MS / MS analysis by data independent analysis in the mass spectrometry unit on a sample containing a compound separated by the chromatograph unit; a component detection unit (42) that detects a compound and a component corresponding to a partial structure of the compound by obtaining MS / MS spectra of a bar graph presentation based on chromatograph mass spectrometry data over a predetermined m / z range for a target sample, estimating precursor ion peaks in each of the MS / MS spectra, and selecting peaks based on a predetermined standard regarding an m / z direction in each of the MS / MS spectra and a predetermined standard regarding a time direction for peaks that can be considered to be identical or an identical group on the MS / MS spectra; a narrowing unit (43, 44) that narrows down components to be analyzed by performing screening using prior information on the detected component; and a composition estimation unit (45) that, by using m / z information corresponding to a narrowed down component, estimate a composition or a chemical formula of the component.

The invention relates to the technical field of vacuum equipment, and discloses an ion lens assembly, an ion source, a mass spectrometer and a mass spectrometry system. The ion lens assembly includes a deflection lens assembly and a return lens assembly. The deflection lens assembly is used for focusing an ion beam in the incident particle beam and enabling the ion beam to deflect towards a first direction. And the axis-returning lens assembly is used for receiving the ion beam from the deflection lens assembly, and the axis-returning lens assembly is used for focusing the received ion beam and enabling the ion beam to deflect towards a second direction.

The invention relates to the technical field of metal spectrum analysis, in particular to a method for determining the element content of a metal sample by using a direct-reading spectrometer. The method comprises the following steps: acquiring a spectrogram of a to-be-analyzed metal sample; further carrying out iterative decomposition on each spectrum peak to obtain a decomposition peak; further inputting the spectrogram and all decomposition peaks of the spectrogram into a spectrum recognition model obtained through self-organizing mapping network training, and recognizing corresponding element categories; and finally, substituting the spectral intensity of each decomposition peak into a pre-established quantitative correction curve of the corresponding element, and calculating to obtain the content of each element in the metal sample without depending on a priori standard spectrogram or a preset overlapping peak number, so that accurate element quantitative determination under a complex overlapping spectrum peak is realized, and the determination precision and adaptability are improved.

The utility model discloses a liquid chromatograph-mass spectrometer waste liquid recovery device which comprises a base, a liquid chromatograph-mass spectrometer main body is arranged at the top of the base, a first conveying assembly is arranged on the left side of the liquid chromatograph-mass spectrometer main body, and a stirring barrel is arranged on the left side of the liquid chromatograph-mass spectrometer main body through the first conveying assembly; a driving assembly is arranged at the top of the stirring barrel, a rotating rod is arranged in the stirring barrel through the driving assembly, a stirring rod is fixedly installed on the surface of the rotating rod, a supporting plate is fixedly installed on the left side of the stirring barrel, a storage box is fixedly installed at the top of the supporting plate, and a second conveying assembly is arranged in the stirring barrel. A shunting pipe is arranged on the right side of the stirring barrel through a second conveying assembly, and a spray head is fixedly mounted at the bottom of the shunting pipe. The cleaning agent can enter the waste liquid dispersedly, and the waste liquid and the cleaning agent are stirred in multiple directions, so that the cleaning agent can be mixed with the waste liquid more quickly, and the waste liquid can be treated more quickly.

The application provides a kind of semiconductor crystal bar's roll grinding machine equipment, it is related to the processing equipment field of semiconductor crystal bar, it includes clamping device, mobile platform, FT-IR infrared spectrometer, roll grinding machine, water spraying device, drying device and X-ray crystal direction detection device;Clamping device includes first clamping part, second clamping part, first drive assembly and first rotating assembly;Roll grinding machine is used to roll grinding workpiece;Water spraying device is used for workpiece water spraying;Drying device is used for workpiece drying;X-ray crystal direction detection device is used for workpiece crystal direction search;FT-IR infrared spectrometer is used for workpiece gap oxygen content measurement.By FT-IR infrared spectrometer, roll grinding machine, water spraying device, drying device and X-ray crystal direction detection device together are set on mobile platform, can be after roll grinding, automatically measure the gap oxygen content of crystal bar, to reduce the handling of crystal bar after roll grinding, reduce handling risk, simplify work flow, improve production efficiency.

A system includes a first pre-separation device configured to perform a first pre-separation of precursor ions according to mobilities of the precursor ions and a second pre-separation device positioned downstream of the first pre-separation device configured to perform a second pre-separation of precursor ions based on a mass-to-charge ratio (m / z) of the precursor ions. The system further includes a mass spectrometer positioned downstream of the second pre-separation device configured to acquire mass spectra for precursor ions emitted from the second pre-separation device. The second pre-separation device is synchronized with the mass spectrometer such that an m / z range of precursor ions emitted from the second pre-separation device corresponds to a precursor m / z isolation window of the mass spectrometer.

The invention discloses a method for detecting the content of trace metal ions in a diazo naphthoquinone photosensitizer. The method comprises the following steps: sample pretreatment: weighing diazonaphthoquinone photosensitizer powder in a clean room, putting the diazonaphthoquinone photosensitizer powder into a cleaned and dried wide-mouth PFA bottle, adding an organic reagent, and carrying out ultrasonic treatment until a solid is completely dissolved; the method comprises the following steps: testing: adding a metal standard substance into an organic solvent to prepare three standard solutions with different concentrations; debugging an instrument, determining target metal in the standard solution in a Cool mode, a No Gas mode and a He mode by using an inductively coupled plasma mass spectrometer to obtain a signal intensity value (CPS value) corresponding to each metal ion concentration in the standard solution, and establishing a standard curve; and measuring the sample in which the photosensitizer is dissolved by using the same steps to obtain the content of metal ions in the sample. According to the method, appropriate detection conditions are optimized for different elements to be detected in the diazo naphthoquinone photosensitizer, polyatomic ion interference and matrix effect in a sample are mainly reduced, the content of 16 metal ions can be accurately detected at the same time, and the test efficiency is high.

A trace of intensity versus time values is received for a series of samples produced by a mass spectrometer. Also, a series of ejections times corresponding to the series of samples produced by a sample introduction system is received. A series of expected peak times corresponding to the series of ejection times are calculated using a known delay time from ejection to mass analysis. At least one isolated peak of the trace is identified using the series of expected peak times. A peak profile is calculated by fitting a mixture of at least two different distribution functions to the at least one isolated peak. For at least one time of the series of expected peak times, an area of a peak at the one time is calculated by fitting the peak profile to the trace at the one time and calculating an area of the fitted peak profile.

An exemplary breath analysis system may include a sampling chamber having a molecule collector disposed therein. The molecule detector may be configured such that volatile organic compounds (VOCs) present in a breath sample introduced to the sampling chamber adhere to the molecule collector. A heating element may introduce heat within the sampling chamber, causing release of at least a portion of the VOCs adhered to the molecule collector. An analysis device (e.g., a mass spectrometer or terahertz (THz) spectrometer) may identify one or more target VOCs from among at least the portion of the VOCs released from the molecule collector and generate an output representative of the identified one or more target VOCs. The output may include information that quantitates a concentration of the one or more target VOCs with respect to a source of the breath sample.

The invention relates to the technical field of intelligent detection, and discloses a T-SVAE feature extraction strategy and a method for improving near infrared spectrum soil rapidly available potassium measurement precision by using the T-SVAE feature extraction strategy, and the method comprises the following steps: step 1, collecting soil surface samples of different plots, obtaining near infrared spectrum data of the soil samples by using a Fourier transform near infrared spectrometer, and calculating the near infrared spectrum data of the soil samples; determining the actual content of quick-acting potassium in the soil sample by adopting a national standard method; the method comprises the following steps: 1, acquiring near infrared spectrum data, 2, preprocessing the acquired near infrared spectrum data, and removing impurity signals caused by instrument fluctuation, environmental interference and sample physical form difference, and 3, constructing a Transform and supervision constraint fused variational self-encoding model (T-SVAE). By constructing a variational self-encoding model fusing Transform and supervision constraint, the problem of feature blindness caused by high-dimensional data difficulty, nonlinear modeling limitation and unsupervised learning in near infrared spectrum data processing of a traditional feature extraction method is effectively solved.