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Proceedings Paper

Plastic optical fiber hydrogen detection sensor systems for harsh environment in aerospace application
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Paper Abstract

This paper describes the 1st successful Plastic Optical Fiber (POF) cable and Glass Optical Fiber (GOF) hydrogen detection sensor systems developed for the Boeing Evolved Expandable Lunch Vehicle (EELV) Delta IV Launch Vehicle harsh environment of engine section. H2 sensors are necessary to monitor the possible leak of rocket prior launch to avoid explosion, which can be highly dangerous. Due to harsh environment of launch vehicle, we developed the first combination of 100 m POF and glass fiber H2 sensors. The hydrogen sensor consisted of optrodes distributed at multiple locations along a fiber optic cable-based network. These hydrogen sensors were used on the Common Booster Core (CBC) of Delta IV had to perform in temperatures between -18° C and +60° C. The hydrogen sensor sensitive chemistry was fully reversible and had demonstrated a response to hydrogen gas in the range of 0% to 10% with a resolution of 0.1 % and a response time of 5 seconds measured at a gas flow rate of 1 cc/mm. The optical signature of the optrode in the visible spectrum varied proportionally to the local hydrogen gas concentration. To qualify the POF and fiber optic cables, performed detail investigation for attenuation loss, thermal, humidity, temperature, vibration and accelerate testing for life expectancy. Extensive networking using LabView were carried out for lab and actual field demonstrations.

Paper Details

Date Published: 10 May 2012
PDF: 15 pages
Proc. SPIE 8368, Photonic Applications for Aerospace, Transportation, and Harsh Environment III, 836807 (10 May 2012); doi: 10.1117/12.918897
Show Author Affiliations
Alex A. Kazemi, ARK International (United States)
The Boeing Co. (United States)
Kish Goswami, InnoSense LLC (United States)
Intelligent Optical Systems (United States)
Edward Mendoza, Intelligent Optical Systems (United States)
Redondo Optics, Inc. (United States)
Lothar Kempen, Intelligent Optical Systems (United States)
Univ. of Applied Science (Germany)

Published in SPIE Proceedings Vol. 8368:
Photonic Applications for Aerospace, Transportation, and Harsh Environment III
Alex A. Kazemi; Nicolas Javahiraly; Allen S. Panahi; Simon Thibault, Editor(s)

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