An optical-fiber-based gas sensor for remote absorption measurement of low-level CH4gas in the near-infrared region
- 1 June 1984
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Journal of Lightwave Technology
- Vol. 2 (3), 234-237
- https://doi.org/10.1109/jlt.1984.1073609
Abstract
A long-distance low-loss silica optical-fiber link connected to a compact absorption cell was employed to realize a fully optical highly sensitive fiber gas sensor for low-level CH4gas in conjunction with a highly radiant InGaAsP light-emitting diode (LED) at 1.66 μm. By using a dielectric interference filter which replaces a monochromator to simplify the system configuration and operation, a 2-km-long silica fiber link was demonstrated to be capable of achieving reproducibly the detection sensitivity of nearly 700 ppm for CH4gas in air, i.e., 1.3 percent of the lower explosion limit of CH4density. This high sensitivity verifies a potential for major applications to strategic points within the environment, like industrial and mining complexes as well as urban and residential areas. This result also indicates that the purely optical gas-sensor system based on ultralow loss optical-fiber networks, incorporating LED's or laser diodes, can be extensively utilized for the real-time remote measurement and surveillance of a number of dangerous, explosive, and toxic gases in the near-infrared region.Keywords
This publication has 8 references indexed in Scilit:
- Absorption measurement of ν_2 + 2ν_3 band of CH_4 at 133 μm using an InGaAsP light emitting diodeApplied Optics, 1983
- Optical remote monitoring of CH4 gas using low-loss optical fiber link and InGaAsP light-emitting diode in 1.33-μm regionApplied Physics Letters, 1983
- Optical Remote Sensing of Environmental Pollution and Danger by Molecular Species Using Low-Loss Optical Fiber Network SystemPublished by Springer Nature ,1983
- Recent progress in fiber fabrication techniques by vapor-phase axial depositionIEEE Journal of Quantum Electronics, 1982
- Optical fiber sensor technologyIEEE Journal of Quantum Electronics, 1982
- Remote monitoring of NO_2 molecules by differential absorption using optical fiber linkApplied Optics, 1981
- Optical-fibre network system for air-pollution monitoring over a wide area by optical absorption methodElectronics Letters, 1979