Piezoresistive Pressure Sensors

The piezoresistive pressure sensor is based on the piezoresistive effect, which refers to the phenomenon that the resistance of a semiconductor changes when it is subjected to an external force. A piezoresistive silicon pressure sensor is usually made of four equal-value resistor strain elements on a silicon chip, forming a Wheatstone bridge. The silicon chip is the "heart" of the piezo pressure sensor. When subjected to pressure, the resistance of the circuit on the chip changes accordingly. The resistance of one pair of arms becomes more significant, while the resistance of the other becomes smaller. When the bridge is out of balance, it will output a voltage proportional to the pressure. The pressure sensor converts pressure into an electrical signal output when working.

Simply put, the piezoresistive sensor working principle is based on the change in the resistance value of the sensing element caused by pressure. The measuring circuit converts the varying voltage signal into an output signal proportional to the pressure.

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Piezoresistive Pressure Sensors VS. Piezoelectric Pressure Sensors

Piezoresistive and piezoelectric pressure sensors are two commonly used types of sensors for measuring pressure. The differences are as follows:

The piezoresistive pressure transducers play a crucial role in the detection part of the industrial automation production process, and they are the core component of the smart industry. As a piezoresistive sensing instruments manufacturer, MicroSensor designs and develops types of industrial pressure sensors, differential pressure transmitters, and level sensors so far, and we will continue to provide more advanced pressure transmitters for the process industry to buy.