Inductive proximity sensor with force transferring support post

Details Inductive proximity sensor with force transferring support post Inductive proximity sensor with force transferring support post

1989-12-07

1992-12-22

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420716, 32420719, 324225, 336 92, 336221, G01B 730, H01F 1704, H01F 2724

Patent

active

051736586

ABSTRACT:
A high pressure proximity sensor for high pressure environments uses a balanced bridge variable inductance magnetic core structure to detect the presence of a external ferrous object by a change in inductance. The sensor magnetic flux path is defined by the sensor's specific geometry which includes core windings on the core and a sensor housing. The core includes a center post of a nonmagnetic material to transfer stress from a housing sensor face to the core's symmetric axis to cancel the effect of an external pressure induced stress on the sensor. The center post is encircled by an elastomer barrier between the housing sensor face and an adjacent end of the internal core to prevent migration of an internal potting compound between the core end and the sensor face. This structure provides satisfactory sensor operation in environments imposing shock and vibration on the sensor as well as high external pressures.

REFERENCES:
patent: 2478983 (1949-08-01), Runbaken et al.
patent: 2766427 (1956-10-01), Brownlow
patent: 3942045 (1976-03-01), Palazzetti
patent: 4612501 (1986-09-01), Costello et al.
patent: 4680543 (1987-07-01), Kohen
patent: 4804911 (1989-02-01), Saito et al.
patent: 4829245 (1989-05-01), Echasseriau et al.
patent: 4829834 (1989-05-01), Masom

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