When pressed, the crystals deform elastically. Pressure measurement based on the piezoelectric method is the amount of such deformation. When a crystal deforms, an electric charge is generated for a very short time. The electrical signal is the result of a relative force applied. Because these sensors measure for a short time, they are not suitable for measuring static pressures, but they are suitable for measuring pressure changes due to factors such as shock, vibration, explosion, and hub shock generated in motors and compressors.
Since only dynamic pressure is measured in this method, they need equipment to detect the measured pressure. The measurement must also be made relative to the initial value before the pressure factor changes. In this case, the pressure can be expressed as a unit of relative pressures, such as relative pascals.
Quartz is commonly used as a sensor crystal because it is inexpensive, stable, and insensitive to temperature changes. Tourmaline is another option that has a faster response time of about microseconds.
* Accuracy of about 0.75%
* Measure very high pressures
* Fast response in less than one nanosecond
* Signal generation by the sensor itself.
* Only has dynamic pressure measurement
* Temperature sensitive
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