Paper Info
Title
Gas Temperature Measurement by Aligning Absorption Spectroscopy of Dual- Phase -Unlocked Optical Combs
Abstract
An accurate gas temperature measurement method with dual-phase-unlocked comb absorption spectroscopy was presented. First, the spectra of interferograms (IGMs) of the dual-optical combs were aligned by full-spectrum cross-correlation. The frequency jittering of the spectra relative to the reference spectra was determined by cross-correlation and corrected by spectral shift. Second, a modified multispectral fitting approach was proposed to eliminate the wavelength-dependent intensity difference between the reference and measurement arms. The difference was eliminated to obtain the modified spectra by the differential operation without scaling between the two arms. Then, the gas temperature was calculated from the modified spectra. In the experiment, acetylene in a heatable airtight cell was employed as the target gas, and spectra over 0.8 THz were obtained. In the range from room temperature to 180 degrees C, the measured temperature agreed linearly with the reference, and the standard deviation of the temperature obtained by averaging 800 spectra for 1 s was less than 1.2 degrees C. The deviation between the mean value of measured temperatures and reference temperature did not exceed 1.9 degrees C.
Year
DOI
Venue
2022
10.1109/TIM.2022.3193181
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Keywords
DocType
Volume
Temperature measurement, Absorption, Radio frequency, Gas lasers, Spectroscopy, Optical pulses, Optical distortion, Absorption spectroscopy, dual-optical combs, gas temperature measurement, multispectral fitting, spectral alignment
Journal
71
ISSN
Citations 
PageRank 
0018-9456
0
0.34
References 
Authors
0
4
Name
Order
Citations
PageRank
Hongyu Zhang100.34
Lijun Xu28544.81
Yingfei Pang300.34
Zhang Cao42213.81