Optical fiber strain sensor with improved linearity range

Details Optical fiber strain sensor with improved linearity range Optical fiber strain sensor with improved linearity range

1992-12-21

1995-01-10

Gonzalez, Frank

Optical waveguides

Optical waveguide sensor

Including physical deformation or movement of waveguide

385 28, 385123, 25022716, G02B 616

Patent

active

053814932

ABSTRACT:
A strain sensor is constructed from a two mode optical fiber. When the optical fiber is surface mounted in a straight line and the object to which the optical fiber is mounted is subjected to strain within a predetermined range, the light intensity of any point at the output of the optical fiber will have a linear relationship to strain, provided the following equation is less than 0.17 radians ##EQU1## where n.sub.co represents the refractive index of the core, k represents the wavenumber of the light, L represents the length of the optical fiber, S.sub.1 represents axial strain, V is ##EQU2## U is a solution to the eigenvalue equation of the optical fiber, v.sub.f represents the Poisson ratio, P.sub.ef represents the effective strain-optic coefficient of the optical fiber and n.sub.ln represents ##EQU3## where K.sub.1 is the modified Bessel function of second kind of order/with argument given by

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C. D. Butter et al., Applied Optics, "Fiber Optics Strain Gauge," vol. 17, No. 18, 15 Sep. 1978, pp. 2867-2869.
G. B. Hocker, Applied Optics, "Fiber Optic Acoustic Sensors with Composite Structure: An Anaylsis," vol. 18, No. 21, 1 Nov. 1979, pp. 3679-3683.
C. K. Asawa et al., Electronic Letters, "High-Sensitivity Fibre-Optic Sensors for Measuring Structural Distortion," vol. 18, No. 9, 29 Apr. 1982, pp. 362-364.

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