Visible light laser tachometer for sensing rotational speed of an object
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United States of America Patent
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Oct 22, 1991
Grant Date -
N/A
app pub date -
May 4, 1990
filing date -
May 4, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A laser light tachometer for measuring the rotational speed of a selected rotating body without making physical contact with that body. The laser technology art is used to provide a beam of light, visible even under extremely bright ambient light conditions, to be used to measure the rotational speed of a rotating device from greater distances than previously possible. A diverging beam of laser light is collimated and transmitted to a rotating body the RPM of which is to be measured. The rotating body modulates the beam and reflects it back to the tachometer where it is focused onto a photodetector, which converts it into an electrical signal representative of the speed of the rotating body. Provisions are made for direct digital readout and for supplying the signal to other devices.
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