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Proceedings Paper

Fiber optic microsensor hydrogen leak detection system on Delta IV launch vehicle
Author(s): Alex A. Kazemi; John W. Goepp; David B. Larson; Mark E. Wuestling
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Paper Abstract

This paper describes the successful development and test of a multipoint fiber optic hydrogen microsensors system during the static firing of an Evolved Expandable Launch Vehicle (EELV)/Delta's common booster core (CBC) rocket engine at NASA's Stennis Space Center. The hydrogen sensitive chemistry is fully reversible and has 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/min. The system consisted of a reversible chemical interaction causing a change in reflective of a thin film of coated Palladium. The sensor using a passive element consisting of chemically reactive microcoatings deposited on the surface of a glass microlens, which is then bonded to an optical fiber. The system uses a multiplexing technique with a fiber optic driver-receiver consisting of a modulated LED source that is launched into the sensor, and photodiode detector that synchronously measures the reflected signal. The system incorporates a microprocessor to perform the data analysis and storage, as well as trending and set alarm function. The paper illustrates the sensor design and performance data under field deployment conditions.

Paper Details

Date Published: 15 April 2008
PDF: 11 pages
Proc. SPIE 6958, Sensors and Systems for Space Applications II, 69580M (15 April 2008); doi: 10.1117/12.783197
Show Author Affiliations
Alex A. Kazemi, The Boeing Co. (United States)
John W. Goepp, The Boeing Co. (United States)
David B. Larson, NextGen Research Corp. (United States)
Mark E. Wuestling, NextGen Research Corp. (United States)

Published in SPIE Proceedings Vol. 6958:
Sensors and Systems for Space Applications II
Richard T. Howard; Pejmun Motaghedi, Editor(s)

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