Method and apparatus for investigation of small displacements of

Details Method and apparatus for investigation of small displacements of Method and apparatus for investigation of small displacements of

1975-08-20

1977-03-22

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

73 675R, G01B 902

Patent

active

040133664

ABSTRACT:
Method and apparatus for monitoring the vibratory displacements of a diffusing or reflecting solid body which in a preferred application is a turbine blade. A laser source of rectilinearly polarized monochromatic light provides a laser beam which is directed at the solid body. The beam reflected off the body is directed toward a first photocell with a photomultiplier along with part of the incident laser beam. Part of the reflected beam is directed toward a second photocell with a photomultiplier. A Kerr or Pockels cell varies the intensity of the laser beam in response to the output current strength from the second photocell to maintain the lighting of the first photocell constant regardless of the presence of speckle phenomenon. Apertures are arranged in front of the photocells and sufficiently small, e.g. one tenth the diameter of the grains of materials of the solid body, so that the lighting of the first photocell may be considered constant at all points. A pulse counter is arranged after the first photomultiplier, and an inverter is disposed between the second photomultiplier and the Kerr or Pockels cell.

REFERENCES:
patent: 3632214 (1972-01-01), Chang et al.
Archbald et al., "A Laser Speckle Interterometer . . . Vibration" Optical struments and Techniques , ed. Dickson, Oriel Press Oct. 1970, pp. 265-275.

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