Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-07-12
1994-09-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356354, 250237G, G01D 534
Patent
active
053491831
ABSTRACT:
Optical measuring devises for measuring the angular position and rotation rate of a shaft 14. The shaft 14 has a variable pitch diffraction grating 22 etched on one end 16. The pitch gradient of the diffraction grating 22 varies as a function of circumferential position on the shaft 14. A monochromatic light source such as laser source 50 provides incident beam 20 which strikes grating 22. A diffracted light beam 26 from a the grating 22 strikes a position detector 61 at varying positions depending on the angular position of the shaft 14. By employing a position detector 61 which is sensitive to the position of the diffracted beam 26, a continuous position indicator of the shaft angular rotation is possible. A microprocessor calculates shaft position and rotation rates from the data supplied from the beam position detectors.
REFERENCES:
patent: 4650995 (1987-03-01), Tokunaga et al.
patent: 4804266 (1989-02-01), Barshad
patent: 4868385 (1989-09-01), Nishimura
patent: 4874245 (1989-10-01), Spillman, Jr. et al.
patent: 4874941 (1989-10-01), Spillman, Jr.
patent: 5104225 (1992-04-01), Masreliez
Field Harry B.
Hamann H. Fredrick
Kahm Steven E.
Le Que T.
Nelms David C.
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