Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1974-11-11
1976-03-30
Grimm, Siegfried H.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
250228, 250233, 356128, G01B 900, G01B 1130
Patent
active
039471276
ABSTRACT:
An optical testing apparatus for use in non-destructive testing of optical omponents 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. An aperture positioned in the light beam permits adjustment of the diameter of the light beam impinging on the optical component to be evaluated. 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.
REFERENCES:
patent: 3160752 (1964-12-01), Bennett
patent: 3436154 (1969-04-01), Baker et al.
patent: 3761179 (1973-09-01), Plummer et al.
Bennett Harold E.
Hutcheson Guilford J.
Soileau Marion J.
Grimm Siegfried H.
Miller Roy
Sciascia R. S.
The United States of America as represented by the Secretary of
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