Piezoresistive pressure cell

Details Piezoresistive pressure cell Piezoresistive pressure cell

1981-01-30

1983-02-15

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

73727, 338 4, G01L 906

Patent

active

043733972

ABSTRACT:
The pressure cell has a front end cell wall embodied by a metering diaphragm which contains at least one resistor applied by coating and passes over at its backside into an annular cylinder barrel which is closed by a rear cell wall cemented to the same by plastic material adapted to be stressed under elastic elongation and shear. The rear cell wall consists of a material which differs from that of the metering diaphragm. Yet the pressure cell is practically free of any external stress under normal ambient conditions because of the elasticity of the plastic material used for cementing. The pressure cell may be used, for example, in electronic sphygmo-manometers, in carburetors of internal combustion engines for automatic adjustment of the same, and the like. Absolute pressure and reference pressure measurements may be taken. By virtue of the small hysteresis, pressure variations in rapid succession can be measured. The preferred pressure measuring range lies between 0.1 and 2 bar, with pressure ranges up to 1000 bar being permissible as well. Also lower pressure ranges can be achieved.

REFERENCES:
patent: 4173900 (1979-11-01), Tanabe et al.

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