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This article introduce a kind of displacement sensor and the matching circuits with it. The sensor can be used to measure the displacement of cartridge insert valve in the medium of pressure with amplitude ranged from 0 Mpa to 32 Mpa.

Paper introduces a new type of small displacement sensor. It has the characteristics of high sensitivety, high pressure resistant, non-contact type etc. The sensor was used in measuring the displacement of the valve cone of a cartridge valve and the results were fairly satisfied.