Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-06-08
1997-07-22
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250214PR, G01D 534
Patent
active
056506139
ABSTRACT:
An apparatus is disclosed for measuring rotation of a shaft with extreme precision. The apparatus includes a housing enclosing a slotted disk wherein the slot is continuously varying about the circumference of the disk. The housing is cylindrical and includes a tubular side portion intermediate a first and second circular face. The two circular faces and the slotted disk have a center. The shaft passes through the center of the two circular faces of the housing and the slotted disk. The slotted disk is fixed to rotate with the shaft. The housing includes a rotation means which permits the shaft to freely rotate in the housing. A first aperture is located outside the housing on the first circular face and a second aperture is located outside the housing on the second circular face, both first and second apertures being co-linear with the slot of the slotted disk and defining a channel. An emission source is located over the first aperture and an emission detector is located over the second aperture. As the shaft rotates, the slot attenuates the emission generated by the emission source. The emission detector detects this attenuated emission and generates a signal which may be processed to determine the rotational position, alignment, velocity and acceleration of the shaft in real time. Applications include industrial, navigation, aerospace, robotics and defense.
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patent: 4902885 (1990-02-01), Kojima et al.
patent: 5030825 (1991-07-01), Ikeuchi
Sensors, Principles & Applications, Peter Hauptman Jan. 1991 pp. 34-48.
A. Dictionary of Symbols, Cirlot, Jan. 1971 pp. 48, 98, 246 & 247.
The Book of the Dragon, Allen et al., Jan. 1979 p. 10.
Hamill, Jr. Tom
Le Que
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