Temperature compensated strain sensor for composite structures

Details Temperature compensated strain sensor for composite structures Temperature compensated strain sensor for composite structures

1990-05-14

1992-03-10

Raevis, Robert

Optics: measuring and testing

Material strain analysis

G01B 1116

Patent

active

050945270

ABSTRACT:
A temperature compensated strain sensor for measuring the strain at specific locations within a molded composite structure and the like, is disclosed. In detail, the invention comprises a hollow tubular member mounted within the structure which has first and second ends extending out thereof and passing in proximity to each specific location at with strain is to be measured. A first optical fiber is mounted within the hollow tubular member and has first and second ends exiting the first and second ends, respectively, of the hollow tubular member. A plurality of second optical fibers, equal to the number of specific locations at which strain is to be measured, are mounted within the hollow tubular member and have first and second ends exiting the first and second ends, respectively, thereof. One each of the second optical fibers exits the hollow tubular member and extends across and is bonded to the resin of the structure at the specific location and thereafter re-enters the hollow tubular member.

REFERENCES:
patent: 3910105 (1975-10-01), Hoffstedt
patent: 4163397 (1979-08-01), Harmer
patent: 4697876 (1987-10-01), Dyott
patent: 4836030 (1989-06-01), Martin
patent: 4932262 (1990-06-01), Wlodarczyk
Journal of Composites Technology & Research, vol. 10, Nov. 88, "A Rugged Optical Fiber Interferometer for Strain Measurements Inside a Composite Material Laminate" by Murpay et al.
OFC Conference (San Francisco), Jan. 90, "Fiber Optic Sensors Using High Resolution Optical Time Domain Instrumentation Systems" by B. Zimmermann.
Laser Sensors IV, SPIE 718, 1987, "Embedded Optical Fiber Strain Sensor for Composite Structure Applications" by W. J. Rowe et al.

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