Temperature compensation for magnetostrictive position detector

Details Temperature compensation for magnetostrictive position detector Temperature compensation for magnetostrictive position detector

1992-07-20

1993-12-28

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420713, 32420724, 324202, 36457107, 367902, G01B 714, G01R 3500, G01S 1508

Patent

active

052743284

ABSTRACT:
In a position detection probe having a magnetostrictive wire stretched between a head and a reflective foot end termination, and a magnet displaceable along the probe and using the sonic pulse propagation time from the magnet to the foot as a position detection parameter, compensation for thermal expansion and thermal change of propagation velocity is made based on the property of the total propagation time along the wire length being a unique function of temperature and calibrating the probe at different temperatures to yield either equations or look up tables of true positions as functions of the total propagation time and the position detection parameter. By mapping wire characteristics at a plurality of magnet positions and temperatures to construct look up tables, wire nonlinearities as well as thermal effects can be compensated for.

REFERENCES:
patent: 4028619 (1977-06-01), Edwards
patent: 4071818 (1978-01-01), Krisst
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patent: 4305283 (1981-12-01), Redding
patent: 4943773 (1990-07-01), Koski et al.
patent: 5017867 (1991-05-01), Dumais et al.
patent: 5076100 (1991-12-01), Hunter et al.

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