| 摘要 |
Optoelectronic apparatus for inspecting the size of apertures in a shell casing includes a light source probe, having an output light diffusing element with a masked central area, for presenting a torroidal zone of constant light intensity about an aperture under test. A light receiving probe couples incident light passing through the aperture to a light detector. The electrical output of the light detector, providing a measure of aperture area, is then tested against upper and lower bounds to characterize the aperture as being of a proper or improper size.
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