Investigation of interferometric noise in fiber-optic gas sensors with use of wavelength modulation spectroscopy
- 1 October 1997
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 36 (28) , 7239-7246
- https://doi.org/10.1364/ao.36.007239
Abstract
We report on interferometric noise limitation of fiber-optic gas sensors with highly coherent lasers and wavelength modulation spectroscopy. Interference between signal wave and reflected waves causes signal fluctuation in the output, which limits the performance of the sensing system. Sensor resolution limited by interferometric noise is calculated for a fiber-optic gas sensor with the Q(6) absorption line of methane gas at approximately 1650 nm. The results are useful for system designers of this particular type of gas sensor.Keywords
This publication has 5 references indexed in Scilit:
- Limitation of absorption-based fiber optic gas sensors by coherent reflectionsApplied Optics, 1997
- Source-noise limitation of fiber-optic methane sensorsApplied Optics, 1995
- Methane and carbon dioxide sensing using a DFB laser diode operating at 1.64 μmElectronics Letters, 1993
- Remote detection of methane with a 166-μm diode laserApplied Optics, 1992
- Remote sensing of methane gas by differential absorption measurement using a wavelength tunable DFB LDIEEE Photonics Technology Letters, 1991