Method and apparatus for measuring surface movement of an object

Details Method and apparatus for measuring surface movement of an object Method and apparatus for measuring surface movement of an object

1994-02-09

1995-05-09

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356351, 356432, 73655, G01B 902

Patent

active

054145104

ABSTRACT:
A system for non-destructively measuring an object and controlling industrial processes in response to the measurement is disclosed in which an impulse laser generates a plurality of sound waves over timed increments in an object. A polarizing interferometer is used to measure surface movement of the object caused by the sound waves and sensed by phase shifts in the signal beam. A photon multiplier senses the phase shift and develops an electrical signal. A signal conditioning arrangement modifies the electrical signals to generate an average signal correlated to the sound waves which in turn is correlated to a physical or metallurgical property of the object, such as temperature, which property may then be used to control the process. External, random vibrations of the workpiece are utilized to develop discernible signals which can be sensed in the interferometer by only one photon multiplier. In addition the interferometer includes an arrangement for optimizing its sensitivity so that movement attributed to various waves can be detected in opaque objects. The interferometer also includes a mechanism for sensing objects with rough surfaces which produce speckle light patterns. Finally the interferometer per se, with the addition of a second photon multiplier is capable of accurately recording beam length distance differences with only one reading.

REFERENCES:
patent: 3694088 (1927-09-01), Gallagher et al.
P. 61 of the Apr, 1991 issue of NASA Tech Briefs.

Affiliated with

Also associated with

Rating

Method and apparatus for measuring surface movement of an object does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for measuring surface movement of an object, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for measuring surface movement of an object will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1709909