1980-02-01

Low Cost Thick-Film Pressure Sensor 800023

Pressure sensors in automobiles are used in connexion with electronic systems intended to control carburation. The pressure range to be measured is around the atmospheric pressure, a tolerance in the order of ±2% is required in the temperature range from 0 to 80°C good reproducibility and reliability, especially as for low infant mortality, together with low prices are mandatory.A new type of pressure sensor aiming to fit the above mentioned characteristics has been developed taking advantage from the piezoresistive effect of thick-film resistors screened-and-fired on ceramic diaphragms.The device consists of a ceramic diagphram bound around the edge, where in proper positions four resistors electrically connected according to Weathstone bridge configuration are screened-and-fired. The deformation of the diaphragm because of an applied pressure causes bridge unbalancing and output signal proportional to the pressure itself.

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