Dark field viewing apparatus

Details Dark field viewing apparatus Dark field viewing apparatus

1981-03-19

1983-01-11

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73629, G01N 2900

Patent

active

043676480

ABSTRACT:
Dark field viewing apparatus comprises either (a) a source of coherent plane wave radiation and focused coherent receiving means, or (b) a source of focused coherent radiation and a coherent receiver of plane wave radiation, the source and receiver being axially aligned in both cases; and elimination means to eliminate any radiation which in the region of the focus would travel substantially parallel to the axis of the apparatus. The apparatus may be a transmission or a reflection scanning acoustic microscope or a holographic recording system, and the elimination means may be a small acoustically-absorbent stop.

REFERENCES:
patent: 4030342 (1977-06-01), Bond et al.
patent: 4198571 (1980-04-01), Sheppard

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