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High-Temperature Optical SensorA high-temperature optical sensor (see Figure 1) has been developed that can operate at temperatures up to 1,000 C. The sensor development process consists of two parts: packaging of a fiber Bragg grating into a housing that allows a more sturdy thermally stable device, and a technological process to which the device is subjected to in order to meet environmental requirements of several hundred C. This technology uses a newly discovered phenomenon of the formation of thermally stable secondary Bragg gratings in communication-grade fibers at high temperatures to construct robust, optical, high-temperature sensors. Testing and performance evaluation (see Figure 2) of packaged sensors demonstrated operability of the devices at 1,000 C for several hundred hours, and during numerous thermal cycling from 400 to 800 C with different heating rates. The technology significantly extends applicability of optical sensors to high-temperature environments including ground testing of engines, flight propulsion control, thermal protection monitoring of launch vehicles, etc. It may also find applications in such non-aerospace arenas as monitoring of nuclear reactors, furnaces, chemical processes, and other hightemperature environments where other measurement techniques are either unreliable, dangerous, undesirable, or unavailable.
Document ID
20100024440
Acquisition Source
Glenn Research Center
Document Type
Other - NASA Tech Brief
Authors
Adamovsky, Grigory
(NASA Glenn Research Center Cleveland, OH, United States)
Juergens, Jeffrey R.
(NASA Glenn Research Center Cleveland, OH, United States)
Varga, Donald J.
(NASA Glenn Research Center Cleveland, OH, United States)
Floyd, Bertram M.
(Sierra Lobo, Inc. OH, United States)
Date Acquired
August 24, 2013
Publication Date
July 1, 2010
Publication Information
Publication: NASA Tech Briefs, July 2010
Subject Category
Man/System Technology And Life Support
Report/Patent Number
LEW-18381-1
Report Number: LEW-18381-1
Distribution Limits
Public
Copyright
Public Use Permitted.
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