Transducer

Details Transducer Transducer

1975-08-15

1977-09-06

Albritton, C. L.

Electrical resistors

Strain gauge type

73 885SD, 338 6, 357 26, G01L 122

Patent

active

040471446

ABSTRACT:
An electromechanical transducer is provided which employs a piezoresistive substrate support body of semiconductive material of which a first type N or P and a lineal resistor composed of material of a second type (P or N) formed on one surface thereof. The support body has a reduced neck intermediate two pads. The lineal resistor extends between the pads and across the neck on one side of the support body. The lineal resistor is formed by diffusing semiconductive material of the second type of conductivity into the substrate material. Strain is detected by measuring the change in resistance of the lineal resistor. When the transducer is subjected to strain, the resistance changes by an amount depending on the strain. While the electrical current flows through the resistor, heat developed in the resistors flows into the neck and then is conducted through the flaring portions of the neck to the pads and then to an object under test.

REFERENCES:
patent: 3351880 (1967-11-01), Wilner
patent: 3392358 (1968-07-01), Collins
patent: 3492513 (1970-01-01), Hollander, Jr.

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