Process and device for measuring the rotation angle of a rotating object
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United States of America Patent
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Issued Date -
May 13, 2010
app pub date -
Nov 13, 2009
filing date -
Nov 13, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
To measure the rotation angle of two objects rotating in relation to each other, a transmitter (12) emits at least two linearly polarized light rays (a, b, d, c, d), whose polarization planes are rotated relative to one another. The light passes through a polarization filter (16), which revolves relative to the transmitter in dependence on the angle of rotation. The intensity of the light rays (a, b, d, c) is modulated in phase-shifted fashion. The intensity of the light that passes through the polarization filter (16) is measured by a receiver (18) and is evaluated as a signal that is dependent on the rotation angle.
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