Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Eddy current rotor
Patent
1993-06-01
1995-08-15
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Eddy current rotor
25023113, 324 96, 324142, 324157, 324165, 324175, 364483, G01R 1102, G01R 2200, G01D 534, G01P 1304
Patent
active
054422817
ABSTRACT:
An apparatus for recording information about the angular motion of a rotatable disk disposed in a first structure is provided. The disk has regions with differing properties with respect to electromagnetic energy. The apparatus includes first means for emitting a first sequence of electromagnetic energy pulses in a first direction toward the disk. The first emitting means are mounted on the first structure adjacent a first side of the disk. The apparatus also includes second means for emitting a second sequence of electromagnetic energy pulses in a second direction toward the disk, the second emitting means also being mounted on the first structure adjacent the first side of the disk. The first and second directions are such that the first and second sequences of electromagnetic energy pulses reflect from the first side of the disk in different areas, the areas being separated in the direction of rotation of the disk. Photosensitive means are mounted on the first structure so that they can receive the electromagnetic energy pulses from both the first and second emitting means at a single point. The photosensitive means generate a signal in response to the received electromagnetic energy pulses. A controller coupled to the photosensitive means then processes the signal to determine the number of rotations of the disk, and the direction of rotation of the disk.
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Frisch Myron I.
Naumaan Ahmed
EnScan, Inc.
Strecker Gerard R.
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