Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-03-31
1999-05-11
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023118, G01D5/34
Patent
active
059030003
ABSTRACT:
A method is provided for determining the position of a shaft along a longitudinal axis. The method is used with a device that includes first, second, and third light detecting devices arranged about the shaft in a specific geometric pattern, with the second energy detecting device mounted to the shaft. A light directing device is arranged to deliver light energy sequentially between the first, the second, and the third light detecting devices. The method for determining the position of the shaft comprises the steps of generating a first measured value by measuring the interval the light energy directing device travels between the first and the second light detecting devices. A second measured value is generated that measures the interval the energy directing device travels between the second and the third energy detecting devices. A percentage of shaft rotation is calculated using the first and second measured values. The resultant percentage of shaft rotation is adjusted to compensate for the specific geometric pattern of the light detecting devices.
REFERENCES:
patent: 5003171 (1991-03-01), Paley
patent: 5773820 (1998-06-01), Osajda et al.
Honeywell Inc.
Miologos Anthony
Pyo Kevin
Westin Edward P.
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