156 results about "Absorption spectroscopy" patented technology

The methods described herein provide improvements in composite infrared absorption imaging. The scanning approach described herein reduces erroneous measurements caused by thermal drift and optical interference that occurs between light scattering from the top surface of the sample and light scattering from the underlying substrate. Embodiments described herein relate to imaging and spectroscopy, and more particularly, to improvements in photo-thermal imaging and spectroscopy systems, and techniques for obtaining spectral information characterizing optical properties and / or materials or chemical compositions of a sample, such as information related to infrared (IR) absorption spectroscopy.

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 discloses a natural gas calorific value test result correction method, system, equipment and medium, and relates to the technical field of natural gas analys.The method comprises the steps that according to the initial calorific value, the carbon dioxide content and the relative density obtained through testing and pressure data and temperature data of a test point, the first nitrogen content is obtained through calculation based on an S-GERG88 state equation; calculating a first calorific value by using the first nitrogen content and the initial calorific value, and performing iterative calculation according to the first calorific value to obtain a second nitrogen content until the absolute value of the difference between the second nitrogen content and the first nitrogen content is smaller than a preset value; determining the first calorific value corresponding to the obtained second nitrogen content as a target calorific value; through an iterative algorithm, the accuracy of a natural gas calorific value test result and a natural gas working condition compression factor calculation result through the laser absorption spectrometry can be greatly improved, and then the path reliability and applicability of natural gas energy metering through the laser absorption spectrometry are improved.

The present invention relates in one aspect to an absorption spectroscopy apparatus for measuring one or more gases in an atmosphere, wherein the apparatus comprises a wavelength-tunable laser source, a control circuit configured to provide an electrical drive current to the wavelength-tunable laser source; wherein the control circuit is configured to create the electrical drive current as a modulated drive current, wherein the modulated drive current alternates between at least a first and a second drive current, the first drive current configured to cause the wavelength-tunable laser source to emit laser radiation at a first wavelength and the second drive current configured to cause the wavelength-tunable laser source to emit laser radiation at a second wavelength, different from the first wavelength, and wherein the modulated drive current defines a sequence of pulses, each pulse having a non-rectangular pulse shape.

The embodiment of the invention provides a method for determining initial parameters of a transient absorption spectrum kinetics curve, and the method comprises the steps: obtaining an initial absorption point and an absorption attenuation termination point of the transient absorption spectrum kinetics curve, and determining a curve segment between the initial absorption point and the absorption attenuation termination point as a total absorption attenuation interval; carrying out weighting processing on a first-order derivative and a second-order derivative of the transient absorption spectrum dynamic curve to obtain a weighted curvature value sequence; the first N-1 weighted curvature values are selected from the weighted curvature value sequence from large to small, and the total absorption attenuation interval is divided into N absorption attenuation intervals corresponding to curve fitting orders according to sampling points corresponding to the first N-1 weighted curvature values; and determining an initial parameter based on a quantitative relationship of 1 / e of the absorption intensity attenuated to the corresponding interval starting point in each absorption attenuation interval in the exponential fitting model, wherein the quantitative relationship is that the absorption intensity at the interval starting point in each absorption attenuation interval is attenuated to the absorption intensity at the corresponding interval starting point. And the fitting efficiency and accuracy of the dynamic curve are improved.

The invention provides an X-ray absorption spectrum characterization system and an X-ray absorption spectrum characterization method for electrochemical reaction under a high-current working condition. A high-current electrochemical workstation provides current density not lower than that of a working condition electrolytic tank; the working condition electrolytic tank comprises a working electrode chamber and a counter electrode chamber which are oppositely arranged, and an ion exchange membrane arranged between the working electrode chamber and the counter electrode chamber; the working electrode chamber comprises a current-conducting plate made of a metal sheet, a working electrode loaded with a catalyst is arranged on one side, facing the ion exchange membrane, of the current-conducting plate, and a hollow flow channel is formed in the central area of the working electrode chamber; the working electrode chamber further comprises an X-ray window sheet for transmission of incident X-rays and fluorescent X-rays generated by the catalyst; the counter electrode chamber is provided with an electrolyte flow channel, and a counter electrode is arranged on one side, facing the ion exchange membrane, of the counter electrode chamber; and the electrolyte control system is used for realizing circulating flow of the electrolyte. Under the working conditions of high current density, strong bubble effect and high X-ray absorption, in-situ, real-time and high signal-to-noise ratio characterization of the microstructure of the catalyst can be realized.

This invention provides a gas detection method based on absorption spectroscopy, comprising the following steps: (A1) introducing multiple concentration standard gases into a gas cell and adjusting the pressure within the gas cell to obtain the concentration values ​​C of the multiple concentration standard gases at different pressures. 仪 (A2) Fit the pressure P of the same standard gas to obtain the pressure fitting parameters P′ and C corresponding to the standard gas. 标 It is the nominal concentration of the standard gas; (A3) for the nominal concentration C of the standard gas 标 and its corresponding pressure fitting parameters P The pressure fitting parameters P′ and nominal concentration C are processed to obtain the pressure fitting parameters P′ and C′. 标 Establish and store the correspondence between them; (A4) Introduce the sample gas into the gas cell and obtain the sample gas pressure P in the gas cell. 测 The instrument concentration C of the sample gas was obtained using absorption spectroscopy. 测 The concentration P0 is obtained as atmospheric pressure; (A5) Substituting the concentration C into the corresponding relationship, we obtain the P corresponding to concentration C. 实 Thus, the concentration of the sample gas is obtained. This invention has the advantages of small detection error.

The invention relates to a laser methane detection module and a detector thereof, and belongs to the technical field of hazardous gas detection. The detection module comprises a detection module, an anti-attachment module and a processing module. The detection module monitors the methane concentration in the environment in real time through a laser and a first photoelectric detector; the anti-adhesion module monitors and reduces oil stain adhesion by using heating glass, LED lamp beads and a second photoelectric detector; and the processing module realizes signal processing, temperature control and alarm prompt through the photoelectric conversion unit, the processor unit and the temperature control unit. The detector is miniaturized in overall design, low in cost and suitable for being used in small spaces such as household kitchens. High-precision methane detection is realized through a laser absorption spectrum technology, the influence of oil stains on the performance of the detection device is effectively solved by combining with the anti-adhesion module, the service life of the device is prolonged, the maintenance cost is reduced, and the requirements of household users on safety, reliability and easy maintenance of the methane detection device are met.

The invention belongs to the field of soil dissolved organic matter analysis, and provides a multispectral-based DOM detection and reclamation influence evaluation method, which comprises the following steps: step 1, collecting dry farmland soil samples of different reclamation years, and obtaining soil column samples of a plough layer, a plow pan and subsoil; 2, extracting, centrifuging and filtering the soil sample to obtain a DOM solution; 3, detecting the DOM solution by adopting an ultraviolet-visible absorption spectrum; step 4, adopting a three-dimensional fluorescence spectrum and combining parallel factor analysis to obtain fluorescence components and source characteristics of the DOM solution; step 5, analyzing molecular composition and characteristic parameters of the DOM solution by adopting solid-phase extraction in combination with Fourier transform ion cyclotron resonance mass spectrometry; and step 6, based on the detection data in the steps 3-5, evaluating the influence of reclamation years on the composition, structure and degradation characteristics of the DOM. According to the method, multi-dimensional detection of soil DOM is realized through a multi-spectrum and mass spectrum combined technology, and DOM is comprehensively analyzed from a macrostructure to molecular composition.

The invention relates to the technical field of spectral measurement and analysis, and discloses an in-situ cell for rapid and continuous synchrotron radiation X-ray absorption spectrum measurement, the in-situ cell comprises a housing 1, one side of the housing 1 is provided with two through holes, and a counter electrode and a reference electrode are respectively fixed in the two through holes; the first shell and the second shell are correspondingly arranged, and square optical windows are arranged in the center of the second shell and the center of the first shell; the first shell and the second shell are each provided with a hole channel, the two hole channels are located on the two sides of the square optical window respectively, and a working electrode is fixedly arranged between the second shell and the first shell. The in-situ synchrotron radiation X-ray absorption spectrum measuring device is suitable for in-situ synchrotron radiation X-ray absorption spectrum measurement in a time-resolved energy dispersion / transmission mode, and through real-time supply and circular flow of the electrolyte on the surface of the working electrode, the uniformity of the X-ray penetrating through a solution layer is ensured, the elimination of product gas is accelerated, the influence of solution disturbance on a test signal is reduced, and the test stability is improved.

This invention discloses a method for detecting polycyclic aromatic hydrocarbons (PAHs) based on ultraviolet fluorescence and absorption spectroscopy, comprising: Step 1, acquiring the ultraviolet absorption spectrum and the fluorescence emission spectrum of a water sample under ultraviolet light excitation; Step 2, analyzing the corresponding CDOM fluorescence spectrum using the ultraviolet absorption spectrum obtained in Step 1; Step 3, subtracting the CDOM fluorescence spectrum obtained in Step 2 from the fluorescence emission spectrum obtained in Step 1 to obtain a mixed fluorescence spectrum containing multiple PAHs; Step 4, performing multivariate fitting on the mixed fluorescence spectrum obtained in Step 3 to obtain the type and concentration of each PAH in the water sample. This invention also provides a PAH detection device. The method provided by this invention is simple to operate and can directly detect raw water samples, thereby obtaining more accurate PAH detection results.

The invention relates to a method for realizing transient absorption full polarization state measurement based on Stokes parameters. The method is suitable for accurately representing detection light absorption polarization state change caused by pump light excitation. According to the method, a femtosecond pulse generation module is used for generating a pump light and probe light pulse sequence, and the pump light and probe light pulse sequence is modulated by a femtosecond pulse modulation module and then used for exciting a sample and detecting signal changes. The polarization state of the detection light signal is changed through the Stokes parameter modulation module, and finally the detection light signal is collected by the time resolution signal acquisition module. Stokes parameters at different delay moments are calculated by recording the change of the light intensity of the probe light in the on / off state of the pump light, and polarization information such as the degree of polarization, the azimuth angle and the elliptic polarization is further obtained. The method combines a transient absorption spectrum technology and a polarization modulation technology, has time resolution and polarization resolution capabilities, is suitable for research on anisotropic and chiral polarization sensitive samples and the like, and can be widely applied to polarization related fields such as material research and molecular optical analysis.

A method suitable for controlling polymerization reactions in resin manufacturing is provided. A manufacturing method comprising a step of causing reactants to undergo a polymerization reaction, the manufacturing method including measuring at a frequency of 9400–4500 cm⁻¹ －1 The process includes a spectral determination step that uses near-infrared absorption spectroscopy of the polymerization reaction mixture within a certain range to determine the extent of the polymerization reaction, and a viscous behavior determination step that uses the viscous behavior of the polymerization reaction mixture to determine the extent of the polymerization reaction.

The utility model relates to gas detection technical field, the utility model provides a kind of LNG dual-fuel ship exhaust monitoring device, using ultraviolet differential absorption, non-dispersed infrared absorption and tunable semiconductor laser absorption spectroscopy etc. Optical detection principle realizes the synchronous detection of four kinds of gases SO2 (0~1500ppm), CO2 (0~30%), CH4 (0~1500ppm) and NO (0~1500ppm), error is controlled within ±2%FS, response time is not more than 30s. Realize LNG dual-fuel characteristic gas accurate detection simultaneously, with the advantages of high detection precision, fast response speed, simple operation, relatively low cost and strong gas cross-interference resistance ability under complex working conditions.

1. The name of the design product: high-precision transient absorption spectrum detection device. 2. The use of the design product: for ultrafast time-resolved spectral detection, analyzing the transient absorption characteristics of materials after light excitation, suitable for kinetic studies in the fields of chemistry, materials science, biomedicine, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The utility model provides a laser gas telemetering system based on remote calculation and control, which comprises a laser receiving and transmitting optical path passing through target gas, and a semiconductor laser and an aiming laser in the laser receiving and transmitting optical path are connected with a laser driving module. A detection laser beam emitted by the laser receiving and transmitting optical path penetrates through target gas and then is transmitted to the photoelectric conversion module, the laser driving module and the photoelectric conversion module are both connected with the data conversion and communication module, and the data conversion and communication module is connected with the remote calculation and control module and the display alarm module. According to the utility model, a wireless data communication technology, a remote calculation and control technology, a tunable laser absorption spectrum technology and a laser remote measurement technology are fused, the problems of high false alarm rate, slow data calculation and the like of the existing detection system are solved, and the monitoring and early warning requirements of high detection speed, high detection precision and few false alarms are met.

An apparatus comprising a compact folded path cell for optical gas detection and / or measurement utilizing gas absorption spectroscopy. The apparatus includes an electromagnetic radiation source, a gas sample cell housing a reflector, and a detector for electromagnetic radiation. The source and detector are positioned between the reflector elements in a configuration that reflects the radiation away from the source and detector until the reflected radiation has a suitable optical path length, and then reflects the radiation towards the detector. Using spectroscopic analysis, the presence of at least one gas species in a gas sample can be determined and / or at least one parameter can be measured.

The invention relates to the technical field of sewage treatment, and discloses a system and a method for inhibiting nitrous oxide release in a sewage denitrification process, and the system comprises a water inlet unit, a denitrification reaction unit, a dissolved oxygen monitoring module, a central control unit, a gas collection unit and a performance evaluation module. The multi-point arrangement and encryption communication mode of the dissolved oxygen monitoring module improves the accuracy and safety of data acquisition, and the corrosion-resistant design of the gas collection unit and infrared absorption spectrometry detection ensure the reliability of gas analysis. The central control unit realizes the adaptive capability of the system through real-time monitoring and dynamic adjustment, and the performance evaluation module improves the long-term operation efficiency of the system through data analysis and optimization suggestion generation. According to the method, a dissolved oxygen dynamic balance regulation mechanism and a multi-parameter collaborative optimization strategy are introduced, and a real-time monitoring and feedback control technology is combined, so that the problem of generation of byproducts in the nitrification and denitrification process is solved, and the release amount of nitrous oxide is effectively reduced.

To provide a catalyst for an electrode, an electrode for an electrochemical device, and an electrochemical device that achieve higher activity per unit amount of the catalyst relative to activity per unit amount of the respective materials.SOLUTION: A catalyst for an electrode contains a first oxygen compound having a perovskite-type crystal structure including Mn and a second oxygen compound, wherein a change amount in valence of Mn atoms, determined by X-ray absorption spectroscopy before and after heat treatment in a reducing atmosphere, is greater than a change amount in valence of Mn atoms of the first oxygen compound, determined by X-ray absorption spectroscopy before and after heat treatment in the atmosphere.SELECTED DRAWING: Figure 1

This invention discloses a retrieval enhancement generation method for terahertz absorption spectroscopy diagnostics. The method includes: collecting terahertz absorption spectral data of biochemical substances; establishing a terahertz absorption spectral text structure database; establishing a terahertz absorption spectral image structure database; establishing a terahertz absorption spectral structure database; constructing a text vector library in the field of terahertz spectroscopy detection; determining the user question type and extracting structured information; if the user question is a terahertz absorption spectroscopy diagnostic question, then analyzing influencing factors and generating a query question, rewriting the user question into a query question; retrieving the text vector library in the field of terahertz spectroscopy detection based on the query question; generating an answer through a large language model and returning it. This method analyzes and calculates the influencing factors of terahertz absorption spectroscopy based on a structured database and rewrites the query question into a query question more suitable for RAG retrieval, improving the efficiency of researchers in diagnosing absorption spectra and retrieving knowledge in the field of terahertz spectroscopy detection.

The invention provides a wide-temperature-range electrochemical in-situ X-ray absorption spectrum testing device which comprises a heat conduction table, a plurality of temperature control surfaces are arranged on a main body of the heat conduction table, and the plurality of temperature control surfaces are adjacent to each other to form a polygonal enclosed structure; the heat conduction table main body is further provided with a temperature controlled surface, the temperature controlled surface is arranged on one side of the polygonal enclosure structure, and through the design that the plurality of temperature control surfaces of the heat conduction table are of the polygonal enclosure structure and refrigeration and heating are carried out through the temperature control assembly, rapid and accurate wide-temperature-range temperature control on the test groove of the temperature controlled surface is realized; and the test groove is used as a battery carrying platform and is matched with the battery clamp to realize quick replacement of the button battery, so that the test efficiency is greatly improved.

The utility model relates to the technical field of tunable semiconductor laser absorption spectrums, in particular to a TDLAS (tunable diode laser absorption spectroscopy) hardware phase-locked circuit, which comprises a singlechip, a tunable semiconductor laser, a band-pass filter, a phase-locked amplification chip and a low-pass filter. A DAC of the single-chip microcomputer outputs a scanning signal modulated by superposing 40kHz sine waves to drive the tunable semiconductor laser, a light beam of the tunable semiconductor laser passes through the long-optical-path absorption cell and then is converted into an electric signal through the photodiode, and the electric signal output by the photodiode passes through the band-pass filter, the lock-in amplification chip and the low-pass filter and then is transmitted to the single-chip microcomputer. And a second harmonic signal is output to the ADC of the single-chip microcomputer. According to the utility model, a traditional DDS (signal generator) is omitted, so that the cost is effectively reduced; and when different modulation amplitude outputs are carried out, compared with a traditional DDS, the device is more sensitive, independent modulation of single gas in multi-component gas can be achieved, the sensitivity is higher, and production and application are more convenient.

This invention discloses a multidimensional transient absorption spectroscopy measurement device, comprising a pump-probe mechanism and a two-dimensional spectroscopy mechanism. The pump-probe mechanism includes a first pump optical path, a second pump optical path, a probe optical path, and a first delay module. The first pump optical path generates a first pump light to excite the sample, the second pump optical path generates a second pump light to excite the sample, and the probe optical path generates a probe light to monitor the excited-state particle number information of the sample. The first delay module is disposed in the first pump optical path and is used to control the first pump light to illuminate the sample after a first delay time relative to the second pump light. The two-dimensional spectroscopy mechanism includes a fourth focusing element, an optical path deflection component, a beam splitting component, and a two-dimensional surface array detector. This invention integrates a surface array detector and a specific optical path design, enabling simultaneous detection of the multidimensional transient absorption spectrum information of the sample. Combined with multiple independently controllable pump light sources and their delay mechanisms, it achieves rapid three-dimensional measurement.

The invention discloses a multi-dimensional transient absorption spectrum measuring device which comprises a pumping-detecting mechanism and a two-dimensional spectrum mechanism. The pumping-detection mechanism comprises a first pumping light path, a second pumping light path, a detection light path and a first delay module; the first pump light path is used for generating first pump light to excite a sample, the second pump light path is used for generating second pump light to excite the sample, the detection light path is used for generating detection light to monitor excited state particle number information of the sample, and the first time delay module is arranged in the first pump light path; the control module is used for controlling the first pump light to irradiate a sample after being delayed for a first delay time relative to the second pump light; the two-dimensional spectrum mechanism comprises a fourth light condensing element, a light path deflection assembly, a light splitting assembly and a two-dimensional area array detector; according to the invention, an area array detector and a specific light path design are integrated, multi-dimensional transient absorption spectrum information of a sample can be detected at the same time, and three-dimensional rapid measurement is realized in combination with a plurality of independent and controllable pump light sources and a delay mechanism thereof.

The invention discloses a methane telemetering imaging system and method based on an active infrared absorption spectrum and a fast reflector, and the system comprises a main control module, a laser driver, a laser, a detector, an off-axis parabolic reflector, a voice coil fast reflector, and a distance measurement module. The laser driver controls the laser device to emit modulated laser, the voice coil fast reflecting mirror controls the angle of emergent laser, the semiconductor photoelectric detector receives an echo optical signal, converts the echo optical signal into an electric signal and sends the electric signal to the main control module, and the main control module further completes signal analog-to-digital conversion through an analog-to-digital converter. And a digital lock-in amplifier is used to demodulate the signal to respectively obtain a first harmonic and a second harmonic. The method has the advantages of high imaging speed, high spatial resolution, high detection sensitivity and the like.

To improve the measuring sensitivity of a component contained in a gas sample without increasing the cost required in the introduction of a gas absorption spectroscopic system.SOLUTION: The gas absorption spectroscopy system includes a resonator, a light source, a driving device, a control device, and a detector. The resonator includes a first mirror and a second mirror. The light source irradiates the resonator with laser light. The driving device changes a length between the first mirror and the second mirror. The control device controls the drive device. The detector outputs a detection signal corresponding to the detected light to the control device. The drive device sweeps at least one of the first mirror and the second mirror in a wave shape around a sweep center, and adjusts a length between the sweep center and the second mirror to a length between the first mirror and the second mirror when the detection signal is acquired in response to the acquisition of the detection signal by the control device.SELECTED DRAWING: Figure 8

The application provides a full fluorescence yield detector for in-situ soft X-ray absorption spectroscopy, which is based on a photomultiplier and can collect weak fluorescence signals excited by soft X-rays under in-situ conditions (reactions under simulated complex environment conditions). A large-diameter photomultiplier is used and the top angle of the detector is improved to increase the fluorescence collection angle as much as possible to improve the signal strength; double gold meshes are used and different voltages are added to shield interference signals such as photoelectrons and positive ions of non-fluorescence yield at the same time; a spliced half-cylinder barrel design is used to realize shielding and facilitate maintenance and replacement of the photomultiplier; a spring and rubber pad are used in cooperation with a screw to fasten the mode, which can maintain good electrode contact while avoiding overpressure damage to the photomultiplier and can work stably in a vibrating environment. The application optimizes the detector from the aspects of the structure of the detector, detection efficiency, signal interference shielding, maintenance convenience and the like.

The quantum optical system changes a phase of quantum interference occurring between a plurality of physical processes, in each of which a quantum entangled photon pair of a signal photon and an idler photon is generated. Each of a plurality of pixels outputs a detection signal of the signal photon in a state where a sample is arranged in an optical path of the idler photon. A processor calculates an absorption spectroscopy characteristic based on an interferogram indicating a variation in a signal intensity acquired from each of the plurality of pixels in accordance with the change in the phase of the quantum interference. The processor: applies a processing to reduce phase difference of the interferogram among the plurality of pixels; spatially integrates, over the plurality of pixels, the interferogram having gone through the processing to reduce phase differences; and calculates the absorption spectroscopy characteristic based on the integrated interferogram.

The invention relates to a system for determining cellular respiration and nutrient metabolism of living cells or tissues, the system comprising: a cell container configured to receive and maintain a biological sample; a gas volume in fluid communication with the cell container, the gas volume containing gaseous components produced by metabolic activity of the biological sample; an optical detection unit configured to detect a target gas species in the gas volume by wavelength-selective absorption spectroscopy, the optical detection unit being further configured to distinguish between different isotopic species of the target gas species, the optical detection unit comprising an illumination source and detector arrangement optically coupled to the optical detection unit and configured for measurement of absorption signals corresponding to different isotopes of the target gas species; and an electronic control and evaluation unit operatively connected to the optical detection unit, the electronic control and evaluation unit being configured to acquire and process absorption data, determine absolute values and / or temporal variations of the target gas species concentration and isotopic composition, and output respiration-related parameters of the biological sample. In this way, a system is provided that enables precise and efficient determination of carbon dioxide produced by living cells or tissues under physiological conditions.

The invention belongs to the technical field of environmental salt mist concentration measurement, and particularly relates to a salt mist concentration measurement system and method based on laser scattering and absorption spectrum, which can obtain the mass concentration of salt mist liquid drops and the concentration of chloride ions in the liquid drops, further obtain the quantitative result of the salt mist concentration and realize the rapid and accurate measurement of the salt mist concentration. Aiming at the problem of inaccurate online measurement of the salt mist concentration, the invention innovatively proposes simultaneous measurement of a laser scattering signal and a laser absorption spectrum, measurement of the mass density of salt mist liquid drops through the scattering signal and correction of a laser absorption signal. The concentration of chloride ions is obtained through the laser absorption spectrum, and then the salt mist concentration is calculated. According to the invention, on-line and accurate measurement of the environmental salt mist concentration can be realized.