Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1992-04-27
1994-07-19
Housel, James C.
Optics: measuring and testing
By particle light scattering
With photocell detection
356345, 356356, 25023113, G01B 902
Patent
active
053313992
ABSTRACT:
A method for measuring and determining a rotation angle of a rotating object in which a clock track corresponding to a desired angular resolution is applied on a magnetic, optical or optomagnetic storage medium. The storage medium is then rotated synchronously with the rotating object, and during the operation a pulse sequence corresponding to the clock track is read from said storage medium. The read pulse sequence is then supplied for further processing to following electronics in which the actual rotation angle is firstly stored in a FIFO memory and secondly directly available for further uses. Furthermore, the invention provides an apparatus for measuring and determining a path difference in Michelson interferometers in which path difference are generated via a rotary movement, for example of a rotating retroreflector. A memory medium is rigidly connected to the rotation shaft of the rotating retroreflector generating a path difference and on said medium a clock track corresponding to the sampling theorem is applied and during the rotation movement is read by a read head fixedly associated with the storage medium. During operation said pulse sequence is read by the read head and supplied to following signal electronics in which from the pulse sequence the desired clock pulse and thus the path information is then obtained.
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Dietl Helmut
Haschberger Peter
Lindermeir Erwin
Mayer Oliver
Tank Volker
Deutsche Forschungsanstalt fur Luft- und Raumfahrt
Housel James C.
Pyon Harold Y.
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