Thermal measuring and testing – Temperature measurement – Nonelectrical – nonmagnetic – or nonmechanical temperature...
Patent
1993-08-12
1995-05-30
Gutierrez, Diego F. F.
Thermal measuring and testing
Temperature measurement
Nonelectrical, nonmagnetic, or nonmechanical temperature...
385 12, 25022714, G01K 1100, G01K 562
Patent
active
054196361
ABSTRACT:
A temperature sensor is made of optical fiber into which quasi-sinusoidal microbends have been permanently introduced. In particular, the present invention includes a graded-index optical fiber directing steady light through a section of the optical fiber containing a plurality of permanent microbends. The microbend section of the optical fiber is contained in a thermally expansive sheath, attached to a thermally expansive structure, or attached to a bimetallic element undergoing temperature changes and being monitored. The microbend section is secured to the thermally expansive sheath which allows the amplitude of the microbends to decrease with temperature. The resultant increase in the optical fiber's transmission thus allows temperature to be measured. The plural microbend section of the optical fiber is secured to the thermally expansive structure only at its ends and the microbends themselves are completely unconstrained laterally by any bonding agent to obtain maximum longitudinal temperature sensitivity. Although the permanent microbends reduce the transmission capabilities of fiber optics, the present invention utilizes this phenomenon as a transduction mechanism which is optimized to measure temperature.
REFERENCES:
patent: 4039248 (1977-08-01), Franke et al.
patent: 4443700 (1984-04-01), Macedo et al.
patent: 4678903 (1987-07-01), Wlodarczyk et al.
patent: 4729627 (1988-03-01), Saito et al.
patent: 4812645 (1989-03-01), Griffiths
patent: 4846547 (1989-06-01), Falco et al.
patent: 5096277 (1992-03-01), Kleinerman
patent: 5132529 (1992-07-01), Weiss
patent: 5251274 (1993-10-01), Carlstrom et al.
patent: 5258614 (1993-11-01), Kidwell et al.
patent: 5272333 (1993-12-01), Fagan et al.
N. Lagakos et al., "Microbend Fiber-Optic Sensor," Applied Optics, vol. 26, No. 11 pp. 2179 (Jun. 1987).
J. N. Fields et al, "Fiber Optic Pressure Sensor" J. Acoust. Soc. Am. vol. 67, No. 3, pp. 816-818 (Mar. 1980).
J. N. Fields, "Attenuation of a Parabolic-Index Fiber with Periodic Bends," Applied Physics Letters, vol. 36, No. 10, pp. 799-801 (May 1980).
Cone Gregory A.
Gutierrez Diego F. F.
Sandia Corporation
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