Same as when we feed electrical charge to the sensor it gets stretch or compresses. Piezoelectric effect is reversible effect means when we applied mechanical stress to the piezoelectric material we get some electrical charge at output. The word Piezoelectric derived from the Greek word ‘piezein’ which means to push, press and squeeze. The ability of a piezoelectric material to convert a mechanical stress into electrical charge is called a Piezoelectric Effect. Piezoelectric sensor is used to convert the mechanical stress into electric charge, it gives AC at output. Take a look at our comprehensive range of pressure sensors, many brought to you from industry leading brands including our very own, RS Pro.Pierre Curie founded the piezoelectric effect in 1880, but it started to be used for industrial sensing application in 1950. These include medical, aviation, automotive and marine. They are often used to measure pressure drops, fluid levels and flow rates.Pressure Sensor ApplicationsPressure sensors are used in a wide variety of applications across many industries. They are not disturbed by EMI and can be used in noisy or medical environments.MEMS – Short for micro-electro-mechanical system and contains capacitive or piezo pressure sensing mechanisms on silicon at micron level resolution.Types of Pressure SensorsThere are various properties which can be used to classify the type of sensor it is and its appropriate application, including what pressure range they measure, their operating temperature range or the pressure type they measure.Absolute Pressure Sensor - This type of sensor measures pressure relative to the perfect vacuum (zero reference point).Gauge Pressure Sensors - These are often used to measure atmospheric pressure and are sometimes referred to as relative pressure sensors.Sealed Gauge Pressure Sensors - Similar to gauge pressure sensors except they measure pressure relative to a fixed pressure, not the current ambient atmospheric pressure which can vary.Differential Pressure Sensors - These can be used to measure the difference between two different pressures (differential pressure) which can be connected to either side of the sensor. Piezoelectric pressure sensors are ideal for measuring fast changing pressures.Optical Sensors - These use interferometry to measure pressure changes in optical fibre. The mechanical displacement within the sensor is turned into an electrical output signal which is achieved with 5 different methods.Resistive Sensors - These types of sensors use the change in electrical resistance of a strain gauge connected to the diaphragm.Capacitive Sensors - Are highly sensitive and are able to measure low pressure under 10 bar while still withstanding large overloads.Piezoelectric Sensors - These sensors use substances like Quartz to generate a charge on the surface when pressure is applied. Depending on the measurement requirements, this can influence their sensing accuracy and reliability. You can find out more on our useful pressure sensors guide.There are various sensor technologies used within pressure sensor devices. The output of the measurement is then converted into an electrical signal which reflects the amount of pressure applied. Pressure Sensors What are Pressure Sensors? Pressure sensors are devices that sense the applied pressure of gases or liquids.
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