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Miniature fiber optic temperature sensors

Patent image
NRL

An intensity-based fiber optic temperature sensor having a fiber probe with a multimode transmit/receive fiber, a reflector spaced apart from the end of the fiber, and a housing affixed at its ends to the fiber probe and reflector, the housing having a larger or smaller thermal expansion coefficient than those of the fiber probe and reflector. Temperature changes cause a change in the gap distance between the fiber end and the reflector, changing the amount of reflected light coupled into the optical fiber. Temperature sensors can also have a fiber probe with two or more multimode receiving fibers surrounding a transmitting fiber. Other temperature sensors include a fiber probe with a multimode transmitting fiber, a reference multimode receiving fiber and a sensing multimode receiving fiber for reducing noise effects.

Inventors: 
Lagakos, Nicholas; Bucaro, Joseph A.
Patent Number: 
Technical domain: 
Sensors and Measurement
FIle Date: 
2010-01-25
Grant Date: 
2012-06-05
Grant time: 
862 days
Grant time percentile rank: 
15
Claim count percentile rank: 
7
Citations percentile rank: 
4
'Cited by' percentile rank: 
1
Assignee: 
US NAVY