Optical speed sensing system
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United States of America Patent
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-
Sep 9, 2003
Grant Date -
Jul 24, 2003
app pub date -
Jan 23, 2002
filing date -
Jan 23, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus for determining the rotational speed of an object returning diffuse reflections where no reflective singularity exists on the object or no clearly distinct light pulse is produced. A light source illuminates a target area on the object. An optical system receives the reflected light, selectively filters by wavelength, and focuses the light on a detector for signal processing. The reflected light signals may be a series of complex patterns that repeat once per revolution. A Fourier Transform with additional processing enhancements is performed on the signals and used as a basis to calculate the speed of the object The signal processing may be automated, resulting in a speed (RPM) solution being displayed for the operator of the device.
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