Optics: measuring and testing – Material strain analysis
Patent
1975-06-09
1976-11-16
Corbin, John K.
Optics: measuring and testing
Material strain analysis
73152, 350 35, 350287, G01B 1116, E21B 4900, G03H 102
Patent
active
039920950
ABSTRACT:
An optics module for use in a holographic borehole instrument which is operable to determine 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, drilling a stress relief hole in the wall in stress relieving relation to the selected surface region to produce on the recording medium a double exposure hologram containing holographic information representing the stress. The optics module embodies a frame which adjustably mounts the optical elements of the holographic system of the instrument in a manner which facilitates initial alignment of the system and preserves the alignment during instrument operation.
REFERENCES:
patent: 565346 (1896-08-01), Goodyear, Jr.
patent: 3313205 (1967-04-01), Roberts et al.
patent: 3484715 (1969-12-01), Rempel
Kuske et al., "Photoelastic Stress Analysis," John Wiley & Sons, 1974, pp. 256-264.
Short; N. M., "Borehole TV Camera Gives Geologists Inside Story," UCRL-7133, Lawrence Radiation Lab., U. of Cal., Nov. 5, 1962, pp. 1-20.
Jacoby Jerold L.
Williamson Clyde E.
Anderson Daniel T.
Corbin John K.
Nyhagen Donald R.
Oser Edwin A.
Punter Wm. H.
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