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Multi-absorption-line gas temperature measurement method

A technology of absorption spectrum line and gas temperature, applied in the field of gas temperature measurement, can solve the problems of large error fluctuation of gas temperature measurement results, and achieve the effect of high accuracy and small fluctuation error

Inactive Publication Date: 2018-06-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there is an error in the measurement value of a certain absorption line, it will be completely transferred to the final gas temperature measurement result, which will cause the error fluctuation of the gas temperature measurement result to be relatively large

Method used

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  • Multi-absorption-line gas temperature measurement method

Examples

Experimental program
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Embodiment 1

[0023] Embodiment 1: Utilize tunable diode absorption spectrum technology (TDLAS) to measure the absorption spectrum of ammonia gas under the condition of low pressure, comprise seven absorption lines altogether, after these seven absorption lines are processed, the temperature of ammonia gas to be measured can be obtained .

[0024] The specific operation steps are as follows:

[0025] 1. Using Tunable Diode Absorption Spectroscopy (TDLAS) to measure the absorption spectrum of ammonia under low pressure conditions. First turn on the power of the tunable diode laser, arbitrary waveform generator, digital oscilloscope, and photodetector, and follow the figure 1 Connect the signal lines as shown. Then set the sawtooth wave for the arbitrary waveform generator, so as to linearly adjust the working current of the tunable diode laser, and input the synchronous signal of the sawtooth wave to the digital oscilloscope. Finally, the voltage signal of the photodetector is input to th...

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Abstract

The invention relates to a multi-absorption-line gas temperature measurement method. According to a characteristic that particle number distribution of ground state gas molecules on different energy levels accords with a Boltzmann distribution rule, a high resolution absorption spectrometer is used to measure a fine absorption spectrum of a gas, a series of processing is performed on absorption intensity distribution of each absorption line in the absorption spectrum, and then a gas temperature can be acquired. In a traditional absorption spectrum gas temperature measurement method, one or twoabsorption lines are adopted and absorption information which can be used is less so that the accuracy of a temperature measurement result is poor. In the invention, more absorption lines are adoptedto absorb intensity information so that the accuracy of the temperature measurement result is good. Through the method, an accurate non-Intrusive optical diagnosis method is provided for the temperature measurement work of the ground state gas molecules.

Description

technical field [0001] The invention belongs to the field of gas temperature measurement, and in particular relates to a method for measuring gas temperature by using the relative intensity distribution of a plurality of absorption lines in an absorption spectrum. Background technique [0002] Gas temperature measurement techniques can be simply dichotomized into two categories: contact and non-contact. Contact temperature measurement technologies mainly include thermocouples, thermal resistance, etc. This method of temperature measurement will inevitably disturb the temperature field to be measured. In the case of high temperature to be measured or corrosive gas to be measured, this This contact measurement technique will significantly reduce the life of temperature measurement equipment. Non-contact temperature measurement technology mainly includes emerging optical radiation temperature measurement technology, acoustic temperature measurement technology, CCD imaging temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/00
CPCG01K11/003
Inventor 李留成多丽萍金玉奇于海军王元虎王增强唐书凯李国富汪健曹靖康元福
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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