Wheatstone Bridge-type High Sensitivity and Flexible Implementation of Pressure Sensors and Evaluation of Sensor Performance
Vol. 59, No. 4, pp. 203-208,
Aug. 2022
10.12772/TSE.2022.59.203
PDF
Abstract
The purpose of this study is to implement a high-sensitivity pressure sensor,
which is different from the SWCNT dip-coated pressure sensor that was fabricated using a
conventional pressure sensor manufacturing method, by implementing a Wheatstone
bridge-type pressure sensor. To fabricate a Wheatstone bridge-type pressure sensor, a circuit
was fabricated with conductive thread, and silver paste was printed with a strain
gauge. The analysis was performed according to the number of strain gauges, and the
gauge factor (GF), which is a measure of sensitivity, and the coefficient of determination
were analyzed to evaluate the linearity of the pressure sensor. In terms of linearity, four
strain gauges showed 55 times higher value than that of the SWCNT dip-coated pressure
sensor, but the value was slightly lower than that of the SWCNT-impregnated pressure sensor.
The Wheatstone bridge follows the equation R1×R3=R2×R4 in the equilibrium state, but
when four strain gauges are used, the initial voltage is low and the GF value is high. However,
the linearity was analyzed to be insufficient because the strain gauge was not linearly
stretched by pressure. This is expected to be used in fields requiring high sensitivity, such
as pulse measurement, heart rate measurement, and precision scale.
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