Method and apparatus for interferometric detection of surface di

Details Method and apparatus for interferometric detection of surface di Method and apparatus for interferometric detection of surface di

1990-05-17

1992-10-06

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

25022711, 73655, G01B 1102

Patent

active

051536773

ABSTRACT:
The invention relates to a process and a device for the interferometric detection of surface displacements of solids, particularly in test material which is excited with ultrasonic waves, in which an illumination laser 10 radiates the test material surface 2, and a portion of the reflected light, after passing through a differing optical path length, is brought into a state of interference, while the interference is identified by an installed detector 9. In arrangements of this type known to the prior art, a very expensive apparatus and control system is needed to assure that demodulation of the reflected laser light is performed with maximum sensitivity. This is improved by the invention in that a joint illumination laser 10 is employed to operate several interferometer equipped with waveguides 5, 7, which in bundled fashion terminate in a common transmitter and receiver lens 4 positioned at a distance from the test material, from which lens detector-waveguides also emerge; here allocations which are dependent on the phase relation arise and whose signals are at the least added quantitatively and are employed to identify the ultrasonic events.

REFERENCES:
patent: 4892406 (1990-01-01), Waters
Keck et al., "Wanddickenmessung an 1230.degree. C. heiben Rohrluppen mit em neuartigen Laser-Ultraschall-System" or "Wall Thickness Measurement on 1230.degree. C. Hot Tube Loops With a New Laser-Ultrasound System", Steel & Iron, 1987, pp. 1057-1060.

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