Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1985-03-08
1987-06-23
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
250201, 356 4, 356375, G01B 1114
Patent
active
046748822
ABSTRACT:
A displacement measuring instrument for measuring the displacement of a target including in combination a fiber optic lens assembly including means for maintaining said assembly in space relation with said target, dither means for vibrating said assembly toward and away from said target about the lens null along the axis of said assembly, first electronic means for providing a first output voltage proportional to displacement of said assembly from said target, second electronic means cancelling that portion of said first output voltage resulting from displacement due to said dither means and providing a second voltage resulting from displacement due to means other than said dither means, servo means receiving said second output voltage and moving said assembly with respect to said target to null said second output voltage and measurement means measuring the movement of said servo means.
REFERENCES:
patent: 3940608 (1976-02-01), Kissinger et al.
patent: 3952191 (1976-04-01), Tinet
Dorman Richard A.
Fallek Samuel
Hoogenboom Leo
Hull-Allen Gregory
Kissinger Curtis D.
Claeys Joseph V.
Evans F. L.
Mechanical Technology Incorporated
Sullivan Joseph C.
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