Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1990-05-04
1991-10-22
Wieder, Kenneth A.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
356356, 356358, 356 285, 356 29, 25023113, 324166, G01P 336
Patent
active
050599011
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.
REFERENCES:
patent: 4181432 (1980-01-01), Flower
patent: 4204115 (1980-05-01), Boldridge, Jr.
patent: 4638155 (1987-01-01), Dorr
patent: 4712853 (1987-12-01), Howard
patent: 4880966 (1989-11-01), Goodrich et al.
Edmonds Warren S.
Technology for Energy Corporation
Wieder Kenneth A.
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