Infrared absorption spectrum isotope abundance detection method based on temperature gradient field compensation

Abstract

An infrared absorption spectrum isotope abundance detection method based on temperature gradient field compensation belongs to the field of infrared laser absorption spectrums, and comprises the following steps: firstly, according to the distribution and optical path of a measurement light path, carrying out three-dimensional grid division on a measured gas, so that only one beam of measurement light source passes through each grid; establishing a measured gas temperature gradient field model, and obtaining a measured gas temperature gradient field theoretical database; measuring the temperature of the outer surface of the measured gas container by using a high-precision temperature sensor to obtain the characteristic temperature of the measured gas, and fitting a temperature gradient field by using a fitting algorithm according to the characteristic temperature of the measured gas to obtain the temperature gradient field of the measured gas; and finally, controlling the signal excitation device and the excitation laser through the microcomputer to emit light isotope detection light and heavy isotope detection light respectively, a detection result is obtained through the acquisition device, and the isotope abundance is obtained in combination with the temperature gradient field of the measured gas, so that the influence of the temperature gradient on measurement is overcome, and the measurement accuracy is improved.

Description

technical field [0001] The invention belongs to the field of infrared laser absorption spectroscopy, in particular to an infrared absorption spectroscopy isotope abundance detection method based on temperature gradient field compensation. Background technique [0002] With the development of science and technology, isotope analysis has been widely researched and applied in the fields of science and environmental protection, ecological environment, ecological agriculture, food, medical testing, mineral exploration, nuclear industry, geochemistry, etc., and has been increasingly valued. Especially in the field of geochemistry, as early as the 1980s, researchers noticed the use of environmental isotope technology to explore scientific issues related to earthquake prediction, and the accurate measurement of isotope abundance is the basis of these studies and applications. [0003] At present, the detection of isotopic abundance is mainly based on mass spectrometry and infrared a...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method based on temperature gradient field compensation to solve the problem that the influence of the temperature field of the measured gas on the measurement is not considered in the detection of isotope abundance in the prior art, resulting in the problem that the detection result still has errors compared with the real value. The infrared absorption spectrum isotope abundance detection method uses the temperature gradient field model to obtain the actual temperature of the measured gas, overcomes the error caused by the influence of the temperature gradient, and improves the detection accuracy

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