Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1976-10-15
1977-12-06
Corbin, John K.
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
250571, 356160, 356199, G01B 1108
Patent
active
040614271
ABSTRACT:
A drift compensated and intensity averaged extensometer for measuring the diameter or other properties of a substantially cylindrical sample based upon the shadow of the sample. A beam of laser light is shaped to provide a beam with a uniform intensity along an axis normal to the sample. After passing the sample, the portion of the beam not striking said sample is divided by a beam splitter into a reference signal and a measurement signal. Both of these beams are then chopped by a light chopper to fall upon two photodiode detectors. The resulting AC currents are rectified and then divided into one another, with the final output being proportional to the size of the sample shadow.
REFERENCES:
patent: 2670651 (1954-03-01), Burns et al.
patent: 3905705 (1975-09-01), Petrohilos
patent: 3947129 (1976-03-01), Wiklund
patent: 4021119 (1977-05-01), Stauffer
Fletcher James C. Administrator of the National Aeronautics and Space
Marcus Harris L.
Stocker Phillip J.
Corbin John K.
Manning John R.
Porter George J.
Rosenberger R. A.
Wofford, Jr. L. D.
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