43 results about "Molecular absorption" patented technology

The invention relates to the technical field of near-infrared light analysis materials, in particular to a near-infrared spectrum noninvasive blood glucose concentration dynamic detection method which comprises the steps that a plurality of training samples and blood near-infrared spectrum current data of the current blood glucose concentration to be detected are collected, and the training samples are blood near-infrared spectrum historical data of different blood glucose concentrations; determining a water molecule absorption peak value in the blood near infrared spectrum historical data and the blood near infrared spectrum current data, a corresponding wavelength thereof, and a difference between the water molecule absorption peak width, and obtaining the availability degree of each training sample; the mathematical regression model weight of each training sample is obtained based on the availability degree of each training sample and the collection time of each training sample, so that the mathematical regression model weight of each training sample is more reliable and accurate, the accuracy of the mathematical regression model is improved, and finally the accuracy of blood glucose concentration detection is improved.

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 invention discloses a calibration-free laser absorption spectrum signal processing method based on double spectral lines, which comprises the following steps of: utilizing a polynomial fitting algorithm and a multi-peak analysis algorithm and combining known wavelengths or wave number positions of two adjacent spectral lines of a molecular absorption spectral line; according to the invention, rapid pickup of original light intensity background signals of a laser light source and absolute calibration of emission wavelength of a laser in a tunable laser absorption spectrum system are realized respectively, and the defect that background signals are obtained by using high-purity nitrogen or zero air in a traditional method is overcome. The method has the advantages that the response time is short, the reliability is high, and the reliability problem of long-term measurement results of a tunable laser absorption spectrum technology or a gas sensor in an actual external field environment is effectively solved; the important defects in the prior art are overcome, and the practical value is wide.

The embodiment of the invention relates to a processing method and device for predicting the absorption spectrum of organic molecules. The method comprises the following steps: constructing an absorbance prediction model for predicting the absorbance of molecules according to the wavelength and molecular structure of light waves input by the model; carrying out data acquisition on molecular structures of organic molecules for the organic photovoltaic material and corresponding absorption spectrum curves to obtain a first data set, and training an absorbance prediction model according to the first data set; and after the training is finished, utilizing the absorbance prediction model to perform absorption spectrum curve prediction according to the first wavelength sequence and the first molecular structure input by the user to obtain a corresponding first absorption spectrum curve which is fed back to the current user. According to the method, the processing complexity can be reduced when the absorption spectrum curve prediction task of the organic molecules is processed, the prediction time is shortened, and the prediction efficiency is improved.

This invention provides a gas-phase molecular absorption spectrometry-naphthylethylenediamine hydrochloride spectrophotometric method for determining total nitrogen in waste gas from stationary pollution sources. The method comprises the following steps: S1. Reacting the waste gas with an oxidant; S2. Using an absorbent, further reacting the waste gas after S1; S3. Collecting the oxidant after S1, pretreating it to reduce nitrogen-containing compounds to nitric oxide, and detecting the total nitrogen content I; S4. Collecting the absorbent after S2 to obtain the total nitrogen content II; S5. Summing the total nitrogen content I and total nitrogen content II to obtain the total nitrogen content in the current waste gas. This method enables accurate determination of total nitrogen in waste gas from stationary pollution sources.

The present invention discloses a laser automatic frequency stabilization method, device and storage medium based on iodine molecular absorption lines. Based on the technical theory of iodine molecular absorption lines, a sweep point-transmittance map is established in the sweep frequency mode, and the frequency stabilization reference point corresponding to the frequency stabilization frequency in the iodine molecular absorption spectrum diagram is found. In the frequency stabilization mode, by comparing the current transmittance with the set target transmittance, the analog voltage of the seed source is automatically adjusted, so as to achieve the stability of the output frequency of the seed source and realize long-term automatic frequency stabilization at low cost.

This invention discloses a data processing method for carbon dioxide column concentration based on a spaceborne lidar, comprising: performing nonlinear correction on the spaceborne integral path differential absorption (IPDA) lidar detection signal; calculating the differential optical thickness based on the IPDA lidar signal; calculating the echo height above sea level and geographic coordinates based on the echo signal location; establishing an absorption cross-section lookup table using differential absorption cross-section data from the High Resolution Transmission Molecular Absorption (HITRAN) database; calculating the pressure at the echo location using the European Centre for Medium-Range Weather Forecasts Reanalysis Dataset (ERA5) and the echo signal height above sea level; calculating the Doppler frequency shift; calculating a weighting function based on pressure profiles, humidity profiles, temperature profiles, and Doppler frequency shift data; and calculating the carbon dioxide column concentration. The key features of this invention are the nonlinear correction of the spaceborne IPDA lidar echo signal, the establishment of a differential absorption cross-section lookup table for carbon dioxide molecules, and the accurate and efficient calculation of the carbon dioxide column concentration using spaceborne IPDA lidar detection data and ERA5 meteorological dataset data.

The invention relates to the technical field of wall sound insulation materials, in particular to a preparation method of a high-sound-absorption composite wall material which comprises the following raw materials in parts by weight: 50-60 parts of a base material, 20-30 parts of an additive, 10-15 parts of an adhesive, 8-10 parts of a flame retardant, 10-15 parts of deionized water, 10-12 parts of glass wool, 6-8 parts of rock wool and 6-8 parts of an additive solution. According to the invention, the calcined illite forms a porous structure, the interlayer spacing is enlarged, when sound waves enter tiny pores of the porous structure, air molecules vibrate at a high speed in a narrow channel, the speed of air molecules close to pore walls is reduced, friction between the molecules and friction between the molecules and the pore walls consume sound wave energy, and sound waves with different frequencies are matched; the carbon black particles fill gaps of rubber molecular chains, so that pore closing and molecular energy absorption caused by thermal expansion are avoided, sound wave transmission is blocked, the overall sound insulation index is improved, and the sound absorption performance of the material is remarkably improved.

The invention discloses a molecular spectrum scanning device and method based on cavity enhancement. The molecular spectrum scanning device comprises a stepping motor, a laser, a cavity enhancement spectrum system, a PDH locking system, an optical frequency comb, a wavelength meter, a spectrum data acquisition card, an industrial personal computer and a voltage amplifier. Through the PDH locking technology, the scanning laser frequency tracks the resonance mode of the optical resonant cavity in real time, the lock losing problem in the scanning process is solved, and high stability is ensured; meanwhile, an optical frequency comb is used as a frequency scale, and real-time and accurate absolute frequency measurement is carried out on the scanning laser through a wavemeter; active frequency locking and absolute frequency calibration technologies are organically combined, high-sensitivity, high-frequency-precision and high-stability cavity enhanced molecular absorption spectrum measurement is achieved, and the method is particularly suitable for the fields of trace gas detection, precision spectroscopy, atmospheric environment monitoring and the like.

The invention discloses a frequency discrimination curve calibration system, method and device, and relates to the technical field of laser remote sensing, the system locks the output laser frequency of a first laser on a low-concentration atom or molecule absorption peak to obtain an accurate frequency standard; the laser output by the second laser device and the laser output by the first laser device are subjected to beam combination beat frequency, a frequency difference is extracted from a beat frequency signal power spectrum to generate a tuning control signal of the second laser device, and the output laser frequency of the second laser device is locked at any preset frequency offset; the whole laser radar system utilizes an electric control optical switch to realize conversion between a calibration state and a detection state: in the calibration state, laser from the second laser is gated for frequency discrimination curve calibration; and in a detection state, gating the received atmospheric echo signal light for atmospheric remote sensing detection. Therefore, on the basis of ensuring the calibration precision and stability of the frequency discrimination curve, the calibration cost of the frequency discrimination curve is reduced, and the calibration efficiency of the frequency discrimination curve is improved.

The embodiment of the present application relates to a kind of processing method and device for predicting the absorption spectrum of organic molecule, the method comprises: constructing a molecular absorbance prediction model for carrying out molecular absorbance prediction processing according to model input wavelength and molecular structure of light wave;And the molecular structure of the organic molecule for organic photovoltaic material is carried out data acquisition to obtain first data set, and corresponding absorption spectrum curve, and the absorbance prediction model is trained according to first data set;And after training, the first wavelength sequence and the first molecular structure of user input are used to predict the absorption spectrum curve, and the corresponding first absorption spectrum curve is fed back to the current user by using absorbance prediction model. By the present application, the processing complexity can be reduced, the prediction time can be shortened, and the prediction efficiency can be improved when processing the absorption spectrum curve prediction task of organic molecule.

The application discloses an aerosol correction method and system suitable for a hyperspectral resolution laser radar, and relates to the technical field of laser radar detection. Specifically, the method comprises the following steps: a first auxiliary detection channel and a second auxiliary detection channel specially added and containing iodine molecular absorption cells are used to filter out aerosol Mie scattering components in specific frequency laser echoes; pure first atmospheric temperature data is obtained based on data inversion of the auxiliary detection channels; atmospheric aerosol backscattering ratios are calculated in combination with reference channel data; the backscattering ratios are used to correct wind speed and temperature inversion models of the laser radar, and then corrected atmospheric wind speed and temperature data are obtained. The application aims to expand the minimum detection height of a hyperspectral resolution Rayleigh temperature and wind measurement laser radar by accurately quantifying and eliminating aerosol interference, and to realize high-precision synchronous measurement of wind speed and temperature in low-altitude and aerosol-rich areas.

The invention belongs to the field of green chemical industry, and discloses a preparation method of a J-type porphyrin supramolecule (TCPP-LSA-J) with ultra-long near-infrared absorption performance and application of the J-type porphyrin supramolecule in preparation of hydrogen peroxide through photo-thermal catalysis under the condition of no sacrificial agent. The method comprises the following steps: mixing the prepared TCPP-LSA-J with ultrapure water (50.0-100.0 mL), irradiating by a xenon lamp (lambda is greater than or equal to 420 nm) under the conditions of 20-100 DEG C, O2 flow of 25.0-50.0 mL / min and continuous stirring, reacting, filtering and concentrating to obtain a high-concentration hydrogen peroxide aqueous solution. Under the LDH confinement effect, the TCPP molecular layers are arranged in an inclined and staggered mode to form J-type supramolecules, the absorption wavelength is expanded to the second near-infrared region (1750 nm), and efficient utilization of solar energy is achieved. The system does not need an organic sacrificial agent, is green and environment-friendly, takes O2 as an oxygen source, and is safe, low in energy consumption, mild in reaction condition, simple and convenient to operate and high in yield.

A kind of lidar technology for atmospheric waveguide fast measurement, temperature and humidity profile, the key factor of atmospheric waveguide, can be measured simultaneously, the device includes laser emission module: 822nm online seed laser, 822nm offline seed laser, 1064nm pump laser, laser frequency locking module, optical parametric oscillator, acoustooptic modulator, frequency doubling module and emission optical assembly;Echo receiving module: optical receiving telescope and optical lens assembly, F-P filter, polarization light splitting prism, iodine molecular absorption cell, Fizeau interferometer and photodetector;Data acquisition and processing module.The present application fuses differential absorption lidar and two detection systems based on interferometer high spectral lidar, adopts seed injection optical parametric oscillator laser technology, obtains high frequency stability 822nm laser to realize atmospheric humidity profile fast measurement, remaining 532nm laser realizes atmospheric temperature profile fast measurement, finally inverts atmospheric waveguide parameter, realizes atmospheric waveguide efficient and accurate measurement.

Present invention relates to a needle-free glucose measurement system which enable measurement of blood glucose level using concentration value of N2O molecule available in breath air, which comprises an electronic assembly (1.1) which stabilizes the temperature and flow of wavelength-adjustable laser light source (1.2) and controls wavelength, a laser-based sensor (1) which determines concentration values of N2O molecule by measuring the adsorption amount of detector (1.5) wherein beams coming from laser light source (1.2) are adsorbed by N2O molecules in the breath air in the adsorption cell (1.4), and a processor (2) which determine glucose values in the blood using the concentration data coming from laser-based sensor (1).

This application discloses a system, method, and apparatus for frequency discrimination curve calibration. Frequency locking technology is employed to stably lock the output laser frequency of the seed laser onto the absorption peak of the atomic / molecular absorption cell, effectively solving the problem of seed laser frequency drift. Simultaneously, two acousto-optic modulators are used to perform precise extracavity passive frequency modulation of the seed laser, shifting the laser frequency from the atomic / molecular absorption peak position to the preset zero-velocity frequency point and the edge frequency point of the linear operating region of the optical frequency discriminator. During calibration, the telescope is vertically pointed towards the zenith, providing atmospheric echoes with zero Doppler shift as a reference. At this time, the optical frequency discriminator measures and records the transmittance at the preset zero-velocity frequency point at the center of the linear operating region and at the edge frequency point. Based on the linear assumption of the frequency discrimination curve, a new frequency discrimination curve can be derived.

This invention provides a foam elimination method and apparatus, relating to the field of defoaming technology in the filling process. It utilizes a laser generator to produce a laser beam, which is transmitted to a homogenizer. The homogenizer shapes the laser beam into a planar spot for output. The wavelength of the laser is located in the absorption peak band of liquid water. The energy of the laser is absorbed by water molecules in the foam liquid film and converted into heat energy, causing the liquid film to vaporize instantaneously and break up the foam. The advantages of this invention are that it uses laser light incident from the side of the container, directly utilizing the thermal effect to vaporize the foam liquid film, avoiding complex acoustic wave conversion and conduit structures; it is unaffected by liquid color and transparency; the laser spot can be pre-adjusted to cover the foam area, eliminating the need for dynamic focusing during filling; and it does not damage containers such as PET, PE, or glass, achieving a highly efficient and stable online defoaming function.

The invention relates to a distorted condensed ring blue vat dye with pyrazine and oxazine structures and a preparation method and application thereof, and discloses a preparation method and application of a blue vat dye with a certain distorted structure. According to the blue dye, different conjugated units are creatively connected in parallel through oxazine and pyrazine fused rings, the conjugated structure of molecules is expanded, the absorption wavelength of the molecules is subjected to red shift, and meanwhile, the fused rings provide high rigidity and stability for the molecules. In addition, the heterocyclic structure of oxazine and pyrazine also provides certain distortion for molecules, so that accumulation among molecules is improved, certain solubility of the molecules is ensured, and intramolecular charge transfer is enhanced. Through the design, the absorption spectrum, the light stability, the heat stability and the acid-base stability of the molecule are improved, and huge potential is provided for the molecule as a novel blue vat dye.

The application provides a TDLAS method and system for synchronously measuring temperature and speed, which comprises a laser, a laser temperature and current control module, a signal generator, a beam splitter, a collimating mirror, a photoelectric detector, a standard device and a data acquisition system. The wavelength output by the laser covers the water molecule absorption spectrum line through the control module, and the sawtooth wave modulation spectrum line is generated through the signal generator and is operated in a time division multiplexing mode. After the laser is emitted by the collimator, the collimating mirror and the photoelectric detector are arranged in a special manner, so that the temperature and speed can be synchronously measured. The laser passes through the measured area, the photoelectric detector receives the photoelectric information carried by the laser, converts the photoelectric information, acquires the data of the electric signal and transmits the data to a computer, and the temperature information and the speed information are synchronously measured by a processing module running in the computer. The installation module of the application is small and is suitable for harsh environments such as high temperature and high pressure. The application has the advantages of high precision, fast response speed, strong anti-noise capability and the capability of synchronously measuring the temperature and speed of the same flow field.

The present invention is directed to a sample holder for use in molecular absorption spectroscopy. The sample holder comprises a first surface having a first predetermined geometry, and a second surface having a second predetermined geometry. The first surface is opposite the second surface. The sample holder is configured to hold a measurement sample between the first surface and the second surface such that a distance between the first surface and the second surface defines an optical pathlength of the sample holder. The predetermined geometries of the first surface and the second surface provides a continuously variable cross-section across the sample holder so as to provide a continuous range of optical pathlengths.

The invention relates to a CUDA (Compute Unified Device Architecture)-based ultrafast reconstruction method for a gas molecular absorption spectrum, belongs to the technical field of gas molecular absorption spectrum calculation, and solves the technical problem of meeting the real-time requirement of wide-spectrum high-resolution scene and non-uniform path calculation. The method comprises the following steps: acquiring spectral line data, constructing a parallel line-by-line calculation program cuLBL, calculating an absorption coefficient spectrum database, constructing a spectrum absorption coefficient fitting parameter database, realizing an absorption coefficient spectrum ultrafast reconstruction program, and reconstructing a gas molecule absorption spectrum. The method is used for realizing rapid calculation of the gas molecule absorption spectrum.

The application belongs to the technical field of optical sensing, and particularly relates to a high-resolution wavelength demodulation device based on laser beat frequency technology, the main structure of which comprises a reference light path and a sensing light path connected with a measuring light path respectively; the measuring light path, the reference light path and the sensing light path are connected with the measuring light path respectively, a gas molecule absorption line is introduced as a reference frequency, laser frequency measurement is reduced from a terahertz wave band to a low-frequency wave band which is easy to measure through an optical heterodyne detection scheme, high-resolution measurement is carried out through an oscilloscope and a frequency meter, and the device has extremely high resolution and long-term stability; the device has the advantages of simple structure, high resolution, good stability, fast response speed, high signal-to-noise ratio and the like, and is suitable for demodulating high-precision optical resonant cavity sensors.

The invention discloses an S-shaped platform peak area measurement method for gas phase molecular absorption spectrum analysis, and relates to the technical field of spectral analysis, the stability and accuracy of measurement are ensured through the steps of preheating an instrument, preparing a carrier liquid, accurately controlling the flow velocity and pump velocity of a carrier and the like; a standard curve is used for calibration, so that the measurement precision is further improved; the whole process is controlled by operation software of the full-automatic gas-phase molecular absorption spectrometer, so that human intervention is reduced, and the measurement efficiency and consistency are improved; automatic sampling, cleaning, air blowing and other steps are adopted, so that the operation process is simplified, and the operation difficulty is reduced; by means of the gas-liquid separation reaction coil pipe and the gas-liquid separation bottle, effective separation of gas and liquid is achieved, and interference of the liquid on gas measurement is avoided.

This invention discloses a high-precision gas parameter measurement system and method based on the harmonic reconstruction principle, belonging to the field of data processing technology. The method includes the following steps: S1, processing the modulated transmittance signal to obtain harmonic curves from order 0 to k0; S2, obtaining the variation curves of each order harmonic with respect to the laser frequency based on the laser frequency variation signal and the harmonic curves from order 0 to k0; S3, determining the molecular absorption spectrum based on the variation curves of each order harmonic with respect to the laser frequency; S4, analyzing the molecular absorption spectrum to determine the physical parameters of the gas being measured. This invention retains the core advantages of wavelength modulation spectroscopy, such as high signal-to-noise ratio, strong anti-interference capability, and high measurement accuracy, while providing a new measurement method for high-precision calibration of spectral physical parameters, high-precision measurement of gas parameters under weak absorption conditions, and gas monitoring in complex industrial environments, effectively expanding the measurement efficiency and application scope of this technology.

This invention discloses a gas detection method and system based on photoacoustic cell acoustic pulse excitation, relating to the field of transformer oil gas detection technology. The method includes the following steps: constructing a gas detection system and a data acquisition system; initializing the photoacoustic cell, light source, and acoustic sensor; performing preliminary calibration of the gas detection system and recording the initial calibration parameters; and using a temperature sensor and a gas analysis sensor to detect changes in the temperature and composition of gases in the transformer oil. This invention utilizes the photoacoustic effect to convert the light energy absorbed by gas molecules into a detectable acoustic signal. Combined with signal preprocessing and feature extraction techniques, it extracts the intensity, frequency, and phase characteristics of the photoacoustic signal, significantly improving the sensitivity of gas detection. Simultaneously, by dynamically adjusting the resonant frequency and modulation frequency of the photoacoustic cell, the signal-to-noise ratio of the photoacoustic signal is optimized, further ensuring the accuracy of gas detection.

The application discloses an amyloid configuration optical detection method based on infrared waveband multi-frequency resonance, which comprises the following steps: obtaining an optical super-structure surface unit; adding an amyloid solution to be detected; irradiating incident light to realize electromagnetic field excitation; detecting the refractive index and layer thickness of a protein formation layer in a groove of a coupling complementary opening resonance ring working in a near-infrared waveband to obtain one-dimensional structure information of the amyloid formation layer to be detected; detecting the component molecule configuration in the groove of the coupling complementary opening resonance ring working in a mid-infrared waveband by using a characteristic absorption peak of a molecule to obtain structure information of the amyloid molecule to be detected; and determining the configuration analysis result of the amyloid to be detected and the relationship between the protein formation layer and the protein component molecule configuration by using the two aspects of information. The application realizes the measurement based on the medium refractive index and the measurement based on the molecular absorption spectrum on the same sensing surface, can realize the protein configuration analysis and organically connects the layer structure and the molecule configuration.

The invention is suitable for the technical field of laser measurement, and provides a compact laser frequency automatic long-term locking system and method, which can obtain an absorption spectrum through triangular wave scanning by adjusting the laser wavelength to be close to a target spectral line. Parameters such as spectral line number, amplitude and distance threshold are set, a target spectral line is automatically identified, and a corresponding voltage value is recorded. And then, through fast and slow PID control, the frequency is locked at a spectral line zero crossing point through PZT and temperature adjustment. And the system monitors the frequency discrimination signal in real time, the PID is closed if the lock is lost, the output value is kept to avoid frequency hopping, then the target spectral line is re-identified through small-range oblique wave scanning and locking is recovered, and long-term stable automatic frequency locking is realized. Therefore, the device can realize many application scenes of laser frequency locking based on the atom / molecule absorption cell, is very suitable for research of high-precision and advanced physical experiments and interference measurement technologies in which a frequency-stabilized light source participates, can fully ensure high accuracy of the laser light source, and can simplify an experiment or measurement device.

The invention relates to the technical field of automatic detection, and discloses a multi-mode needle cylinder liquid intelligent detection method, device and system, and the system comprises a multi-mode imaging module, a dynamic calibration module, a volume calculation module and a man-machine interaction module. The multi-modal imaging module, the dynamic calibration module, the volume calculation module and the man-machine interaction module are jointly configured with a voice alarm module; by arranging a multi-mode imaging end, when the existence of liquid in a needle cylinder is detected, dual-mode data of visible light transmission light intensity distribution and near-infrared absorption spectrum are synchronously acquired, and dual criteria of the existence of the liquid are constructed, so that the liquid level refraction characteristic and the molecular absorption characteristic can be subjected to real-time cross validation; the method guarantees the discrimination of transparent liquid, a low-contrast medium and a bubble-containing medicament, eliminates the misjudgment risk of traditional single spectral imaging, and improves the reliability of liquid existence detection.

The invention discloses a wavelength optimization selection method for a three-wavelength differential absorption laser radar, and the method comprises the steps: introducing an intermediate wavelength between an online wavelength and an offline wavelength, and deducing a three-wavelength differential absorption laser radar inversion equation set; then, a gas absorption model is constructed based on a Voigt linear function, the relation between the absorption cross section of molecules and the temperature and the pressure intensity is established, and an equation set is established according to the temperature, the pressure intensity, the concentration, the laser wavelength and the radar signal power; and finally, discretizing the candidate wavelength interval, analyzing candidate wavelengths one by one by adopting a numerical iteration method, determining an optimal third wavelength by taking the minimum temperature inversion deviation as a criterion, and considering error influences such as molecular extinction and wavelength drift, so that high-precision atmospheric temperature and concentration multi-parameter inversion can be realized in a complex atmospheric environment. The system has good monitoring accuracy, high efficiency and practicability, and has important application value and wide market prospect.

This invention belongs to the field of optical sensing technology and relates to an in-situ calibration device for a temperature sensor based on laser frequency sweeping technology. The main structure includes a laser, an optical attenuator, an optical beam splitter, a first circulator, a second circulator, a gas molecule absorption cell, a sensing probe, a calibration probe, a photodetector, a data acquisition box, an industrial computer, a voltage output module, an analog-to-digital converter, a current controller, and a temperature controller. It uses a laser frequency sweeping system as the sensor demodulation system and a π-PSFBG as the temperature sensing probe. A gas molecule line, unaffected by ambient temperature, is introduced as a frequency standard to compensate for frequency drift caused by environmental noise in real time. A gallium dot bottle is introduced as an absolute temperature reference to provide an absolutely stable temperature environment for the calibration probe, thus calibrating the system frequency drift caused by the π-PSFBG. In-situ calibration technology achieves long-term stability of the temperature sensor. Its structure is simple and can achieve high-resolution and long-term stable measurement.