Temperature Measurements by Wavelength Modulation Diode Laser Absorption Spectroscopy with Logarithmic Conversion and 1f Signal Detection

被引：2

作者：

Liger, Vladimir ^{[1
]}

Mironenko, Vladimir ^{[1
]}

Kuritsyn, Yury ^{[1
]}

Bolshov, Mikhail ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Spect, 5 Fizicheskaya Str, Moscow 108840, Russia

来源：

SENSORS | 2023年 / 23卷 / 02期

关键词：

tunable diode laser absorption spectroscopy; TDLAS; temperature measurements; multiplicative noise; wavelength modulation; first harmonic; logarithmic processing; GAS TEMPERATURE; SPECTROMETRY; DIAGNOSTICS;

D O I：

10.3390/s23020622

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new version of a sensor for temperature measurements in the case of strong laser intensity fluctuation was developed. It was based on tunable diode laser absorption spectroscopy (TDLAS) with wavelength modulation, logarithmic conversion of the absorption signal, and detection of the first harmonic of the modulation frequency. The efficiency of the technique was demonstrated under experimental conditions with excess multiplicative noise. Temperature was evaluated from the ratio of integrated absorbance of two lines of the water molecule with different lower energy levels. Two algorithms of data processing were tested, simultaneous fitting of two spectral ranges with selected absorption lines and independent fitting of two absorption lines profiles. The correctness of the gas temperature evaluation was verified by simultaneous measurements with a commercial thermocouple. An error in temperature evaluation of less than 40 at 1000 K was achieved even when processing a single scan of the diode lasers.

引用

页数：17

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