TT-type resonator-based differential photoacoustic spectroscopy for trace gas detection

A novel TT-type resonator was proposed for the first time, to our knowledge, to realize differential photoacoustic (PA) detection for trace gas measurement. The special design of the TT-type resonator allows us to install the microphone at the resonant center of the acoustic field to maximize the us...

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Bibliographic Details
Published in:Optics letters 2024-04, Vol.49 (8), p.2173-2176
Main Authors: Wang, Fupeng, Fu, Liyan, Zhang, Jianguo, Han, Ze, Pang, Shuo, Xue, Qingsheng, Cao, Diansheng, Li, Qian, Wang, Qiang
Format: Article
Language:English
Subjects:
Acetylene
Consumption
Noise sensitivity
Photoacoustic spectroscopy
Resonators
Sound fields
Spectrum analysis
Trace gases
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Summary:A novel TT-type resonator was proposed for the first time, to our knowledge, to realize differential photoacoustic (PA) detection for trace gas measurement. The special design of the TT-type resonator allows us to install the microphone at the resonant center of the acoustic field to maximize the use of the absorption-induced PA signal. To meet the requirement of low gas consumption and easy integration, the TT-type resonator-based PA cell was fabricated as a fiber-coupled module with an inner volume of only 1.1 ml. For validation, the TT-type PA cell was integrated to a photoacoustic spectroscopy (PAS) system for acetylene detection. As a result, a linearity of 0.99999 was achieved in a concentration range from 0 to 5000 ppm with a noise equivalent sensitivity of 101 ppb. The proposed TT-type resonator contributes a new style of PA cell structure to the field of PAS gas detection, combining the advantages of easy integration, low gas consumption, differential detection, and photoacoustic enhancement together.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.520154