Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-06-19
1991-10-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356376, G01V 904
Patent
active
050618601
ABSTRACT:
A deformation measuring method and device in which an object is irradiated with a laser beam before and after deformation of the object to obtain speckle patterns, the speckle patterns thus obtained are photoelectrically converted into electrical signals, and the cross-correlation function between the speckle patterns is calculated using the electrical signals to obtain displacement of the speckle pattern on the basis of the shift of position of the extreme value of the cross-correlation function and to determine the amount of deformation of the object from the displacement of the speckle pattern. Each of photosensitive elements for converting the speckle patterns into the electrical signals has a rectangular form of a large ratio of a long side to a short side and a photosensitive element array comprising the photosensitive elements has a comb structure in which the photosensitive elements having the above structure are arranged in a strip form.
REFERENCES:
patent: 4678920 (1987-07-01), Iadipaolo et al.
patent: 4790660 (1988-12-01), Ito et al.
patent: 4794262 (1988-12-01), Sato et al.
Yamaguchi, "Advances in the Laser Speckle Strain Gauge", Optical Engineering, vol. 27, No. 3, pp. 214-218, Mar. 1988.
Ogita et al. "Optical Three-Dimensional Displacement Meter", SPIE International Conference on Speckle, vol. 556, pp. 139-145, 1985.
Yamaguchi, "Real-Time Measurement of In-Plane Translation and Tilt by Electronic Speckle Correlation", Japanese Journal of Applied Physics, vol. 19, No. 3, pp. L133-L136, Mar. 1980.
Hamamatsu Photonics Kabushiki Kaisha
Le Que T.
Nelms David C.
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