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Random vibration-driven continuous-wave CRDS system for calibration-free gas concentration measurement
- Source :
- Optics Letters; February 2020, Vol. 45 Issue: 3 p746-749, 4p
- Publication Year :
- 2020
-
Abstract
- Random vibrations were employed to pick up each monochromatic component in a continuous-wave cavity ringdown spectroscopy (CRDS) system using a bichromatic laser source. Light frequencies were selected within flat portions of an absorption profile to suppress the jitter in laser frequency during measurements. An interference effect caused by cavity length variations was suppressed by optimizing the initial fit point for each ringdown transient. The difference in exponential decay rates of two frequencies determined the gas mole fraction, and no calibration of empty cavity losses was necessary. Experiments on varying humidity were conducted, and the results agreed with the readings of a commercial hygrometer.
Details
- Language :
- English
- ISSN :
- 01469592 and 15394794
- Volume :
- 45
- Issue :
- 3
- Database :
- Supplemental Index
- Journal :
- Optics Letters
- Publication Type :
- Periodical
- Accession number :
- ejs52196351