JSM 2005 - Toronto

Abstract #303008

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Legend: = Applied Session, = Theme Session, = Presenter
Activity Number: 402
Type: Contributed
Date/Time: Wednesday, August 10, 2005 : 10:30 AM to 12:20 PM
Sponsor: Section on Physical and Engineering Sciences
Abstract - #303008
Title: Lab Evaluation of Fiber Optic EFPI Sensors for Extreme Environment Tests
Author(s): David Banaszak*+ and Larry O. Kretz
Companies: Air Force Research Laboratory and Air Force Research Laboratory
Address: 168 Stratmore, New Carlisle, OH, 45344, United States
Keywords: Fiber ; Sensor ; Strain ; Measurement ; Temperature ; Correlation
Abstract:

AFRL engineers are evaluating Extrinsic Fiber Fabry-Perot Interferometer (EFPI) sensors for measuring strain on structures at temperatures up to 2000 ºF (1093.3 ºC) under applied mechanical loads. Extreme thermal environments are encountered in reentry vehicles and hot jet engine exhaust of high performance aircraft. The EFPI sensors utilize gold-coated optical fibers to handmake sensors that measure gaps (L) of 30-80 µm (1.18-3.15 mil) between inline fibers in a quartz tube. Technicians attach the fibers to the structures at end points using a flame spray technique or high-temperature adhesive to provide a gage length (GL). Using the measured change in gap (?L), the strain is determined as strain (e) = ?L/GL. Many control variables affect the output and uncertainty of the sensors. AFRL is determining potential control variables by performing inhouse experiments using EFPI sensors mounted on several materials to evaluate the effectiveness of these sensors' use on future Air Force high-temperature tests where conventional strain gages fail. This paper presents plans, efforts, and results to investigate the impact of these variables on sensor performance.

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Revised March 2005