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Remote sensing of methane gas by differential absorption measurement using a wavelength tunable DFB LD

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5 Author(s)
Y. Shimose ; Anritsu Corp., Kanagawa, Japan ; T. Okamoto ; A. Maruyama ; M. Aizawa
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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.<>

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IEEE Photonics Technology Letters  (Volume:3 ,  Issue: 1 )