High resolution position sensing apparatus with linear variable

Details High resolution position sensing apparatus with linear variable High resolution position sensing apparatus with linear variable

1982-12-27

1985-04-30

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

318657, 324233, 34087036, G01B 714, H01F 2106, G08C 1908, G01R 3300

Patent

active

045146896

ABSTRACT:
Apparatus for high resolution sensing of the position of a rapidly moving member. The apparatus includes at least two linear variable differential transformers (LVDT's) each having a magnetic core coupled to the movable member. A signal source and a phase shifter provide energizing signals to the primary coil of each LVDT. The energizing signals have the same frequency but are phase shifted relative to each other. The induced secondary voltages of the LVDT's are sampled by synchronous detectors, the outputs of which are combined by an adder into a high resolution output signal. When two LVDT's are utilized, the energizing signals have a relative phase shift of 90.degree. and the effective position sampling rate is doubled. The apparatus can be used to sense the operating frequency of a tunable magnetron.

REFERENCES:
patent: 2564221 (1951-08-01), Hornfeck
patent: 2769969 (1956-11-01), Comstock
patent: 2866153 (1958-12-01), Rhoades
patent: 3193784 (1965-07-01), Lautzenhiser
patent: 3488578 (1970-01-01), Stigmark
patent: 3573444 (1971-04-01), Kawabata et al.
patent: 4059789 (1977-11-01), Cocksedge
patent: 4083237 (1978-04-01), Levesque
patent: 4134065 (1979-01-01), Bauer et al.
patent: 4297698 (1981-10-01), Pauwels et al.
patent: 4311968 (1982-01-01), Pickering et al.

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