The word Piezo comes from the Greek word “piezein,” means squeeze or apply some pressure. The Piezo components in the form or a transducer or sensor operate when some degree of physical pressure is placed on them. There are two forms of Piezo components like piezoresistive pressure sensor and a piezoelectric sensor. In this post, we are going to discuss the difference between the piezoresistive pressure sensor and piezoelectric sensor! Please read on!
The piezoelectric effect is merely the result of stressing a piezo element, such as ceramic, crystal or biological matter. This helps in generating a charge or voltage. This type of effect is found in inexpensive consumer-audio speaker systems.
This type of effect involves stress or pressure. Here the changes in resistance across the piezo material are because of the product not for a charge or voltage. The piezoresistive effect experiences a change in electrical resistance of a semiconductor material, which is due to the mechanical stress.
The basic use of Piezoresistive devices is found in potentiometers, integrated resistor networks, and accelerometers. The piezoresistive devices made from semiconductor material are commonly used in pressure measurement.
Transducers or Sensors:
Piezoresistive transducers convert mechanical energy into the proportionate levels of resistance, whereas the piezoelectric transducers work both ways. The piezoelectric transducers can convert mechanical energy (such as pressure and vibration to electrical energy like voltage or current) and can also operate in reverse by converting electrical energy into mechanical energy (such as sound or vibration).
Both piezoelectric and piezoresistive transducers are available in a wide variety of shapes and packages. Due to their use of semiconductor materials, the piezoresistive transducers tend to be somewhat larger (with many housings, sizes, and shapes) to accommodate the compact and larger designs of the pressure-measurement applications.
Normally the sensors measure or detect the physical quantities like pressure, motion, distance, and temperature. The piezoelectric rely on piezoelectric effect to measure different types of parameters like strain, force or pressure. Whereas, the piezoresistive sensors are sophisticated in design (that includes single crystal silicon, metal-film resistors, and other variations) and used for pressure measurement applications.
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