Optical Component Functional Tester.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes an optical testing apparatus for use in non-destructive testing of optical components to evaluate their operational requirements. The optical component to be tested is mounted on a fixture that allows its accurate alignment and rotation so the entire surface area of the optical component can be scanned in discrete areas. A laser light source is positioned to illuminate the optical component with coherent light beams or rays. Whenever an imperfection is present in the optical component a portion of the light rays illuminating the imperfection will be disarranged or scattered. Both the non-scattered and scattered light rays are gathered by means of pyroelectric detectors and their outputs are compared for obtaining an electrical signal that is proportional to the intensity of the scattered light caused by the imperfection. A visual chart is made of this signal by means of a recorder to indicate the magnitude of the scattered light which can be related to the materiality of the imperfection with respect to its intended utilization.
- Lasers and Masers