Holographic instrument for measuring stress in a borehole wall

Details Holographic instrument for measuring stress in a borehole wall Holographic instrument for measuring stress in a borehole wall

1975-06-09

1976-06-01

Corbin, John K.

Optics: measuring and testing

Material strain analysis

73152, 175 50, 350 35, G01B 1116, E21B 4900

Patent

active

039604489

ABSTRACT:
An instrument for determining the stress in the wall of a borehole by recording successively on the same holographic recording medium two holograms of a selected surface region of the wall, and, in the interval between the two recordings, forming a stress relief in the wall in stress relieving relation to the surface region to produce on the recording medium a double exposure hologram. This hologram contains holographic information which represents the stress in the wall in the vicinity of the surface region and may be converted to data defining the magnitude and direction of the stress.

REFERENCES:
patent: 2942462 (1960-06-01), Buck
patent: 3175392 (1965-03-01), Tharalson et al.
patent: 3330367 (1967-07-01), Redwine
patent: 3831443 (1974-08-01), Planche

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