Laser speckle strain and deformation sensor using linear array i

Details Laser speckle strain and deformation sensor using linear array i Laser speckle strain and deformation sensor using linear array i

1994-05-27

2000-08-01

Kim, Robert H.

Optics: measuring and testing

Material strain analysis

By light interference detector

356345, 356354, G01B 902

Patent

active

06097477&

ABSTRACT:
The invention provides a method of triple-beam and triple-sensor in a laser speckle strain/deformation measurement system. The triple-beam/triple-camera configuration combined with sequential timing of laser beam shutters is capable of providing indications of surface strain and structure deformations. The strain and deformation quantities, the four variables of surface strain, in-plane displacement, out-of-plane displacement and tilt, are determined in closed form solutions.

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Yamaguchi, Ichirou, "Automatic Measurement of In-Plane Translation by Speckle Correlation Using a Linear Image Sensor", 1986 The Institute of Physics, pp. 944-948.
Yamaguchi, Ichirou, "A Laser Speckle Strain Gauge", J. Phys. E. Sci.Instrum. vol. 14, No. 11, Nov. 1981, pp. 1270-1273.
Sarrafzadeh et al., "Cross-Correlation Optical Strain Sensor for Wind Tunnel Test Instrumentation", Final Report for NASA Langley Research Center by American Research Corporation of Virginia (Aug. 1990), pp. 7-50.

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