Calibration-free measurement of absolute gas concentration and temperature via light-induced thermoelastic spectroscopy

The calibration process has always been an inevitable key step of light-induced thermoelastic spectroscopy (LITES) technology, which is also the current primary bottleneck hindering the widespread application. The complexity, high cost, and environmental sensitivity of such a process severely limit the sensing system’s ability to perform long-term, stable, and accurate measurements of the target. We propose a breakthrough calibration-free LITES sensing technique. The core innovation lies in the first-time utilization of quartz thermoelastic effect as the sensing mechanism, combined with full-range light intensity modulation to acquire the complete target gas absorption spectrum, from which absolute gas…

• NN
  National Natural Science Foundation of China

  Awards: 62405078, 62275065, 62335006, 62022032
• CP
  China Postdoctoral Science Foundation

  Award: 2024M764172
• NS
  Natural Science Foundation of Heilongjiang Province

  Awards: LBH-Z23144, LH2024F031, 62022032