Deformograph

Details Deformograph Deformograph

1981-09-22

1983-09-20

Punter, William H.

Optics: measuring and testing

Material strain analysis

With polarized light

73768, 73784, 73800, G01B 1118, G01L 124, G01L 3324

Patent

active

044052316

ABSTRACT:
A deformograph comprises a sensitive element shaped as a tube of an optically sensitive material and fixed in a borehole by cementing the gap between said tube and walls of the borehole. One end of the tube is tapered off and provided with a specular coating, while the other end thereof has a specular coating with transparent sections. There are also provided a polarized light source furnishing a light signal transmitted through the material of the tube, and a sensing unit designed to pick off from the sensitive element a useful light signal indicative of the changing condition of the earth's crust in a given area.

REFERENCES:
patent: 3256768 (1966-06-01), Nisida
patent: 3313205 (1967-04-01), Roberts et al.
patent: 4123158 (1978-10-01), Reytblatt

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