Pressure sensor

Details Pressure sensor Pressure sensor

1980-08-29

1982-09-28

Gill, James J.

Measuring and testing

Fluid pressure gauge

Diaphragm

324208, G01L 914

Patent

active

043511910

ABSTRACT:
A pressure sensor comprising a pressure-displacement transducer mechanism including a movable body driven by a hydraulic pressure to be determined and spring means for urging the movable body in a direction opposite to the pressure, and a displacement-pulse phase conversion unit including a ferromagnetic member secured to the movable body, a magnetically soft member carrying an electrical coil thereon and disposed at a stationary point adjacent to the region of movement of the ferromagnetic member and a permanent magnet. A pulse voltage is applied to one end of the electrical coil, the other end of which is connected in series with a resistor. A voltage drop across the resistor is detected, and a time lag of the voltage drop with respect to the pulse voltage, representing a displacement of the ferromagnetic member in response to a change in the hydraulic pressure, is determined and provided in the form of an analog voltage or a digital code.

REFERENCES:
patent: 3168830 (1965-02-01), Chass
patent: 3807223 (1974-05-01), Juillerat et al.
patent: 3855528 (1974-12-01), Brown
patent: 3877314 (1975-04-01), Bernin
patent: 4006402 (1977-02-01), Mincuzzi
patent: 4042898 (1977-08-01), Tomczak et al.
patent: 4140971 (1979-02-01), Blincoe
patent: 4170498 (1979-10-01), Jost et al.
patent: 4226126 (1980-09-01), Herden
"Force and Displacement Transducers . . . " by Mohri et al. from Electrical Engineering in Japan vol. 99, No. 2, pp. 105-112 (2-79).

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