Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1981-08-10
1983-11-15
Groody, James J.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
34087017, 34087038, 34087042, 374143, 374173, G01B 718, G08C 1904, G08C 2502
Patent
active
044148534
ABSTRACT:
A pressure transmitter is provided for producing a voltage signal representative of the magnitude of pressure being applied to a diaphragm of the transmitter, wherein a network including strain-sensitive resistors that are formed in the diaphragm is coupled to the output of a constant-current power supply for producing the voltage signal in response to the strain generated by the applied pressure in the diaphragm and a feedback circuit operates in a non-linear manner for generating a control signal in response to a temperature signal produced by the network. The power supply coupled to receive the control signal is responsive thereto for changing the current supplied to the network so that compensation is thereby provided for errors in the pressure measurement caused by changes in the temperature of the network resistors.
REFERENCES:
patent: 3841150 (1974-10-01), Pearson
patent: 4000643 (1977-01-01), Pearson
patent: 4202218 (1980-05-01), Romo
patent: 4337665 (1982-07-01), Sato et al.
Groody James J.
Paglierani Ronald J.
The Foxboro Company
Wu Jack H.
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