Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1988-10-24
1991-05-14
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
With light attenuation
350 66, 356124, G01B 1130
Patent
active
050150960
ABSTRACT:
A method and apparatus for scanning and testing optical components is disclosed. An incident laser beam is directed at a trihedral retroreflector and is redirected by the trihedral retroreflector onto a test surface. The trihedral retroreflector is movable in X and Y directions over the test surface, in a plane perpendicular to the incident beam, scanning the incident beam over the test surface. The reflected beam from the test surface is redirected by the trihedral retroreflector to measurement instrumentation including a photodetector. If the test surface is planar, the reflected beam retraces the path of the incident beam independent of the translation of the trihedral retroreflector. Irregularities in the test surface cause deflections of the reflected beam. The linear scanning range, in both X and Y direction, of a single trihedral retroreflector of diameter "d" is the value (d times 2). The linear scanning range of a series of "n" trihedral retroreflectors of diameter "d" is the value (d times 2.sup.n).
REFERENCES:
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patent: 3885875 (1975-05-01), Rosenfeld et al.
patent: 3977789 (1976-08-01), Hunter et al.
patent: 4266847 (1981-05-01), Menke
patent: 4427295 (1984-01-01), Nishiyama
Kowalski Frank V.
Milner Thomas E.
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