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Miniature fiber optic temperature sensor with edge reflector

Patent image
NRL

A fiber-optic temperature sensor with a cantilever beam including two different material strips with different thermal expansion coefficients, the cantilever beam having a reflective surface on an end of the cantilever beam, an optical fiber probe including a transmitting multimode optical fiber and at least one receiving multimode optical fiber for receiving reflected light from the reflective surface. Temperature changes at the sensor are indicated by a change in reflected light coupled into the receiving multimode optical fiber due to lateral displacement of the edge of the reflective surface caused by bending of the cantilever beam. Some embodiments have additional reference receiving fibers for compensation for noise, changes in gap length, and other factors.

Inventors: 
Lagakos, Nicholas; Bucaro, Joseph A.
Patent Number: 
Technical domain: 
Sensors and Measurement
FIle Date: 
2010-02-02
Grant Date: 
2012-12-04
Grant time: 
1,036 days
Grant time percentile rank: 
19
Claim count percentile rank: 
5
Citations percentile rank: 
4
'Cited by' percentile rank: 
1
Assignee: 
US NAVY