Remote sensing of methane gas by differential absorption measurement using a wavelength tunable DFB LD
- 1 January 1991
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 3 (1) , 86-87
- https://doi.org/10.1109/68.68057
Abstract
In the method described a single wavelength tunable distributed-feedback laser diode (DFB LD) in the 1.65- mu m region is used to emit two different wavelengths of equal power which are modulated 180 degrees out of phase with each other at a frequency of 10 kHz. One of the two wavelengths is frequency stabilized via a methane gas cell and a feedback system equipped with a lock-in amplifier. A sensitivity of 4 p.p.m.-m methane in 1-atm nitrogen has been achieved. This light source has greatly simplified the setup for the measurements of this kind.Keywords
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