New remote gas infrared optical fiber sensor

Yasser Alayli; Sofiane Bendamardji; Serge J. Huard

doi:10.1117/12.251242

23 September 1996 New remote gas infrared optical fiber sensor

Yasser Alayli, Sofiane Bendamardji, Serge J. Huard

Proceedings Volume 2881, Microelectronic Structures and MEMS for Optical Processing II; (1996) https://doi.org/10.1117/12.251242
Event: Micromachining and Microfabrication '96, 1996, Austin, TX, United States

Abstract

A new remote optical fiber sensor is presented for the detection of carbon dioxide by molecular absorption in the near infrared corresponding to fundamental mode v₃ equals 2349 cm^-1 (4.257 micrometers ). To overcome this problem of the strong attenuation signal of optical fibers in the infrared, the opto power supply, technique is used which changes the working wavelength from 4.3 micrometers to 860 nm and permits the use of standard 50/125 multimode optical fibers. The simulation of absorption has been obtained by modeling the carbon dioxide absorption spectrum. The relative absorption versus the partial pressure of carbon dioxide have been compared to different theoretical models. The establishment of the calibration curves indicate that the sensor detects partial pressures greater than 100 (mu) bar with a minimal error margin of 100 (mu) bar, which is acceptable considering the future use of the device. The sensor was designed to monitor carbon dioxide concentrations in enriched greenhouses.

Citation Download Citation

Yasser Alayli, Sofiane Bendamardji, and Serge J. Huard "New remote gas infrared optical fiber sensor", Proc. SPIE 2881, Microelectronic Structures and MEMS for Optical Processing II, (23 September 1996); https://doi.org/10.1117/12.251242

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