Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1982-04-02
1983-11-08
Perkey, William B.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
354202, 354230, 354266, 324208, 73DIG2, G03B 1700, G01B 714
Patent
active
044138920
ABSTRACT:
Position sensing mechanism, particularly for photographic apparatus controlled by a digital computer, includes a magnetostrictive position sensing device for supplying information on the positions of movable parts of the apparatus to the computer. The magnetostrictive position sensing device comprises a magnetostrictive element, such as a wire, a first electromagnetic transducer disposed with respect to the magnetostrictive element for transducing an acoustic pulse therein, and a second electromagnetic transducer disposed with respect to the magnetostrictive element for transducing the acoustic pulse, the first and second transducers being constructed for relative movement and a timer for measuring the propagation time of the acoustic pulse between the transducers. The measured time represents the relative position of the transducers along the magnetostrictive element.
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Close Thomas H.
Eastman Kodak Company
Perkey William B.
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