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Method for realization of online calibration of photoacoustic spectroscopy system pool constants by use of oxygen in atmosphere

A technology of photoacoustic spectroscopy and calibration method, applied in the measurement of color/spectral characteristics, etc., can solve the problems of inconvenient storage and carrying of standard gas, uncertainty, etc., and achieve broad practical value, accurate calibration, and avoidance of uncertainty. Effect

Inactive Publication Date: 2014-12-31
ZHEJIANG MEASUREMENT SCI RES INST
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Problems solved by technology

[0004] In order to solve the technical problems of uncertainty caused by the calibration of standard gas in gas detection instruments in the prior art, and inconvenient storage and carrying of standard gas, the present invention provides a simple photoacoustic instrument that can eliminate standard gas On-line Calibration Method of Spectrum

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  • Method for realization of online calibration of photoacoustic spectroscopy system pool constants by use of oxygen in atmosphere
  • Method for realization of online calibration of photoacoustic spectroscopy system pool constants by use of oxygen in atmosphere

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Embodiment 1

[0015] Such as figure 1 As shown, the online calibration system of the cell constant of the photoacoustic spectroscopy system is realized by using oxygen in the atmosphere, which includes a tunable laser 1, a beam splitting prism 2, an electro-optic intensity modulator 3, a photoacoustic cell 4, an air pump 5, and a flow controller 6 , photodetector 7, microphone 8, preamplifier 9, lock-in amplifier 10, computer 11, atmospheric temperature humidity-air pressure detector 12, signal generator 13 and wavelength meter 14. The photoacoustic cell 4 is a cylinder. The photoacoustic cell 4 is provided with a cylindrical resonant cavity, and two ends of the resonant cavity are respectively connected with a buffer chamber I and a buffer chamber II. The centerlines of the buffer chamber I, the resonance cavity and the buffer chamber II are on the same axis. The left end of the resonance cavity communicates with the buffer chamber I, and the buffer chamber I is provided with an air inle...

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Abstract

The invention provides a method for realization of online calibration of photoacoustic spectroscopy system pool constants by use of oxygen in atmosphere, and relates to the method for realization of online calibration of the photoacoustic spectroscopy system pool constants. Part of light emitted by a laser emits into a wavemeter by a beam splitter prism, and another part of the light emitted by the laser emits into a photoelectric detector by an electro-optic intensity modulator and a photoacoustic cell, the photoelectric detector inputs into a computer; an atmosphere flow enters into the photoacoustic cell, a microphone picks up photoacoustic signals to input into the computer; the computer calculates to obtain system constants by combination of collected data and atmospheric oxygen concentration and absorption coefficients, and the like. The method solves the technical problems of uncertainty and inconvenient use brought by the fact that a gas detection instrument in the prior art needs calibration by use of a standard gas. The beneficial effects of the method are that: by use of the known and relatively stable characteristics of the atmospheric oxygen concentration for calibration, uncertainty brought by the standard gas can be avoided, and the on-line calibration function can be realized. The operation is convenient, the calibration is accurate, and the method provides the reliable theoretical basis for online calibration of a photoacoustic spectroscopy system.

Description

technical field [0001] The invention relates to an online calibration method of the pool constant of a photoacoustic spectroscopy system, in particular, an online calibration method for realizing the pool constant of the photoacoustic spectroscopy system by utilizing oxygen in the atmosphere is designed. Background technique [0002] There are already many applications of photoacoustic spectroscopy for detecting trace gases at home and abroad, and the detection limit can reach ppb or even ppt levels. Photoacoustic spectroscopy is based on the photoacoustic effect. After the gas absorbs light energy, a non-radiative transition occurs, which generates heat energy and causes the temperature of the absorbing medium to rise. The intensity or wavelength of the incident light is modulated in the range of sound frequency, so that the temperature of the medium changes periodically at the same frequency, thereby generating sound waves. The concentration and absorption coefficient of...

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Application Information

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IPC IPC(8): G01N21/39
Inventor 张建锋陈哲敏潘孙强林晓露裘越
Owner ZHEJIANG MEASUREMENT SCI RES INST
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