Method and apparatus for detecting the position of a movable obj

Details Method and apparatus for detecting the position of a movable obj Method and apparatus for detecting the position of a movable obj

1984-10-05

1987-03-31

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

33125W, G01B 714, G01S 1500

Patent

active

046545905

ABSTRACT:
A plurality of permanent magnets are disposed on a movable object with predetermined spacings between them, and a fixed permanent magnet or magnets are disposed at positions spaced apart by a predetermined distance from the detection portion of a waveguide disposed along the movable object. Magnetostrictive ultrasonic waves generated on the waveguide are detected at the positions of these permanent magnets, and the position of the movable object is detected from the number of ultrasonic wave signals and the propagation time.

REFERENCES:
patent: 3898555 (1975-08-01), Tellerman
patent: 4144519 (1979-03-01), Chamuel
patent: 4238844 (1980-12-01), Ueda et al.
patent: 4404523 (1983-09-01), Hughes et al.

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