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Investigation of laser‐induced grating spectroscopy of O 2 for accurate temperature measurements towards applications in harsh environments
Author(s) -
Hot Dina,
Sahlberg AnnaLena,
Alden Marcus,
Li Zhongshan
Publication year - 2021
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.6099
Subject(s) - laser , grating , spectroscopy , raman spectroscopy , absorption (acoustics) , electrostriction , wavelength , thermal , temperature measurement , materials science , optoelectronics , optics , analytical chemistry (journal) , chemistry , physics , thermodynamics , chromatography , quantum mechanics , piezoelectricity , composite material
We present an in‐depth investigation of laser‐induced grating spectroscopy (LIGS) for temperature measurements in practical applications using a narrow‐band dye laser with 760 nm wavelength and a pulse duration of 8 ns as the source for the pump beams creating the laser‐induced grating. The pump laser wavelength was set to be either resonant with the Q R 5 transition from the b 1 Σ g +υ ′ = 0 ← X 3 Σ g −υ ′ ′ = 0band of O 2 for generation of thermal LIGS or nonresonant for generation of purely electrostrictive LIGS. Signals were generated in ambient air as well as in high‐pressure or high‐temperature dry air mixtures. Pump laser irradiances up to 11 GW/cm 2 were used, which resulted in strong electrostrictive contribution to the overall LIGS signals at atmospheric pressure, with a low thermal contribution due to the weak absorption by the singlet O 2b 1 Σ g +v ′ = 0 . The advantage and disadvantage of thermal or electrostrictive LIGS for temperature measurements are discussed, as well as potential applications in high‐pressure environments. Furthermore, the precision of the temperature measurement is discussed by comparing different analysis methods.