Apparatus for measuring small displacements by using barberpole

Details Apparatus for measuring small displacements by using barberpole Apparatus for measuring small displacements by using barberpole

1990-10-29

1992-08-25

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

73517R, 73728, 32420712, 32420723, 32420724, 32420725, G01B 714, G01B 730, G01P 1508, G01L 914

Patent

active

051422255

ABSTRACT:
An apparatus for measuring small displacements, either linear or angular, employ a pair of spaced "barber pole" or other magnetic field sensitive elements and a movable magnet, in which the exact position of the movable magnet is determined from the voltages sensed at the two elements. The voltages are evaluated in a circuit which produces a rectangular voltage or equivalent, in which the mark/space ratio equates to the position of the magnet between the two sensors.

REFERENCES:
patent: 3474332 (1969-10-01), Brown
patent: 3973191 (1976-08-01), Zabler
patent: 4115923 (1978-09-01), Smith et al.
patent: 4140971 (1979-02-01), Blincoe
patent: 4408169 (1983-10-01), Fraser
patent: 4603295 (1986-07-01), Heemstra
patent: 4841245 (1989-06-01), Fiori, Jr.
patent: 4992733 (1991-02-01), Griebeler

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