Force measuring apparatus and method using stress-induced birefr

Details Force measuring apparatus and method using stress-induced birefr Force measuring apparatus and method using stress-induced birefr

1985-01-14

1988-04-26

Rosenberger, R. A.

Optics: measuring and testing

Material strain analysis

By light interference detector

356367, 250227, G01L 124

Patent

active

047400781

ABSTRACT:
The force measuring apparatus includes a single-mode optical fiber having a defined anisotropy, whereby coherent light suppled to one end of the optical fiber is guided as two waves having linear orthogonal polarizations, respectively. The optical fiber is arranged between a pair of parallel planar pressure plates, the orientation of the optical fiber being such that the aforementioned linear polarizations are parallel with and normal to the remote surfaces of the pressure plates, respectively. Upon the application of a force to be measured in the compressive direction normal to one remote surface of a plate, a phase shift is produced between the waves which is a function of the magnitude of the load to be measured, as determined by interferometer means arranged at the other end of the optical fiber. The optical fiber may be of a helical configuration having turns that are contained between successive pairs of pressure plates, respectively, arranged in a stack, thereby achieving a multiplication of the measuring effect with increased accuracy of the corresponding measurement.

REFERENCES:
patent: 3556662 (1968-05-01), Levenstein et al.
patent: 4442350 (1984-04-01), Rashleigh
"Change of the Refractive Index in an Optical Fiber Due to External Forces", Nasano et al., Applied Optics, vol. 17, #13, 7/1978.

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