Optics: measuring and testing – Material strain analysis – By light interference detector
Patent
1995-08-10
1997-05-13
Gonzalez, Frank
Optics: measuring and testing
Material strain analysis
By light interference detector
356345, 356352, G01B 902
Patent
active
056297572
ABSTRACT:
A laser strainmeter has a plurality of sensor resonators, each comprising a multiple reflection interferometer having a pair of concave mirrors (8) which are secured to the inner wall of a container (1) to face each other in the diametrical direction of the container so that the optical axes of the sensor resonators extend in different directions. The laser strainmeter further has a reference resonator comprising a multiple reflection interferometer having a pair of concave mirrors (12) which are disposed in the vicinity of the sensor resonators, and which are held at a fixed distance. Laser light having the same resonance frequencies as those of the associated resonators are transmitted from laser oscillators to the resonators through optical fibers (3). A change in distance between the pair of concave mirrors of each of the sensor resonators is obtained from a difference in resonance frequency between each sensor resonator and the reference resonator, thereby obtaining a strain change of a medium in which the container is buried.
REFERENCES:
patent: 4627728 (1986-12-01), Willson
patent: 5353115 (1994-10-01), McIntyre
Shoji Sakata et al., Borehole-type Tiltmeter and Three-Component Stranmeter For Earthquake Prediction, J. Phys. Earth, 34, Suppl., S129-S140, 1986.
Gonzalez Frank
Kim Robert
Science and Technology Agency National Research Institute for Ea
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