期刊
APPLIED PHYSICS LETTERS
卷 116, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5129014
关键词
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资金
- National Natural Science Foundation of China [61875047, 61505041]
- Natural Science Foundation of Heilongjiang Province of China [YQ2019F006]
- Fundamental Research Funds for the Central Universities
- Heilongjiang Province Postdoctoral Foundation [LBH-Q18052]
- THORLABS GmbH within the joint-research laboratory PolySense
- Robert Welch Foundation [C0586]
A highly sensitive trace gas sensor based on light-induced thermoelastic spectroscopy (LITES) and a custom quartz tuning fork (QTF) is reported. The QTF has a T-shaped prong geometry and grooves carved on the prongs' surface, allowing a reduction of both the resonance frequency and the electrical resistance but retaining a high resonance quality factor. The base of the QTF prongs is the area maximizing the light-induced thermoelastic effect. The front surface of this area was left uncoated to allow laser transmission through the quartz, while on the back side of the QTF, a gold film was coated to back-reflect the laser beam and further enhance the light absorption inside the crystal. Acetylene (C2H2) was chosen as the target gas to test and validate the LITES sensor. We demonstrated that the sensor response scales linearly with the laser power incident on the prong base, and the optimum signal to noise ratio was obtained at an optical power of 4 mW. A minimum detection limit of similar to 325 ppb was achieved at an integration time of 1s, corresponding to a normalized noise equivalent absorption coefficient of 9.16x10(-10)cm(-1)W/root Hz, nearly one order of magnitude better with respect to the value obtained with a standard 32.768kHz QTF-based LITES sensor under the same experimental conditions. Published under license by AIP Publishing.
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