Inductive displacement transducer having telescoping probe assem

Details Inductive displacement transducer having telescoping probe assem Inductive displacement transducer having telescoping probe assem

1991-10-23

1993-04-27

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420722, 336133, G01B 714, H01F 2106

Patent

active

052065871

ABSTRACT:
An inductive displacement transducer is provided having a two-piece probe assembly capable of being displaced within the hollow interior portion of a coil. The probe assembly comprises a cylindrical rod disposed within a tube. The rod and the tube are each movable with respect to each other and with respect to the coil. The coil is uniformly wound and is connected electrically in parallel with a stable-frequency current-based oscillator which transmits an AC voltage oscillating signal corresponding to the inductance of the coil. A demodulating circuit, which is capable of converting the AC voltage oscillating signal to a DC voltage level, is connected in parallel with the oscillator. In the preferred embodiment, the coil is covered with a shield which is slit along its length. In operation, the two-piece probe assembly is displaced within a hollow portion of the coil such that a change in inductance results when the rod is displaced relative to the tube. A corresponding change in the AC voltage amplitude of the oscillator output is communicated to the demodulating circuit which generates a change in DC voltage level corresponding to the change in the oscillating signal.

REFERENCES:
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patent: 3991393 (1976-11-01), Becker et al.
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patent: 4406999 (1983-09-01), Ward
patent: 4502006 (1985-02-01), Goodwin et al.
patent: 4627280 (1986-12-01), Hayashi et al.
patent: 4667158 (1987-05-01), Redlich
patent: 4950985 (1990-08-01), Voss et al.

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