Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent
1992-03-25
1993-06-15
Hellner, Mark
Optics: measuring and testing
Angle measuring or angular axial alignment
Apex of angle at observing or detecting station
356152, G01B 1126
Patent
active
052203972
ABSTRACT:
A new method of angle measurement is based on the internal reflection effect at an air/glass boundary. The method uses a differential detection scheme to largely reduce the inherent non-linearity of the reflectance versus the angle of incidence in internal reflection. With non-linearity reduced, the displacement of the angle of incidence can be determined accurately by measuring the reflectance. The resolution and measurement range are determined by the initial angle of incidence, the polarization state of light, and the number of reflections. Compared with interferometers and autocollimators, this method has the advantage of a simple sensor design for applications ranging from very wide measurement range to extremely high resolution. Apparatus for accomplishing the method comprises a beamsplitter, a pair of critical angle prisms and a pair of photodiodes. Each photodiode measures change in reflectance and with the application of suitable computation means produces an angle measurement of the beam incident to the beamsplitter.
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Huang Peisen
Kiyono Satoshi
Deimen James M.
Hellner Mark
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