Pressure sensors are widely used in various industrial automatic control environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military, petrochemical, oil wells, power, ships, machine tools, pipelines and many other industries.
Pressure sensor is a kind of sensor commonly used in industrial practice. It is widely used in various industrial automatic control environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, power, ships, machine tools , Pipeline and many other industries. And in different environments, you need to use different types of pressure sensors to avoid errors. Next, let's take a look at the working principle of different types of pressure sensors.
1. Piezoresistive force sensor: The resistance strain gauge is one of the main components of the piezoresistive strain sensor. The working principle of metal resistance strain gauge is the phenomenon that the resistance of the strain resistance adsorbed on the base material changes with the mechanical deformation, which is commonly known as the resistance strain effect.
2. Ceramic pressure sensor: The ceramic pressure sensor is based on the piezoresistive effect. The pressure directly acts on the front surface of the ceramic diaphragm, causing a slight deformation of the diaphragm. The thick film resistor is printed on the back of the ceramic diaphragm and connected into a Wheatstone The bridge, due to the piezoresistive effect of the varistor, causes the bridge to generate a highly linear voltage signal proportional to the pressure and proportional to the excitation voltage. The standard signal is calibrated to 2.0 / 3.0 / 3.3mV according to the different pressure ranges / V, etc., compatible with strain sensors.
3. Diffusion silicon pressure sensor: The working principle of the diffusion silicon pressure sensor is also based on the piezoresistive effect. Using the principle of piezoresistive effect, the pressure of the measured medium directly acts on the sensor's diaphragm (stainless steel or ceramic), so that the diaphragm is generated and the medium The micro-displacement proportional to the pressure changes the resistance value of the sensor, uses electronic circuits to detect this change, and converts and outputs a standard measurement signal corresponding to this pressure.
4. Sapphire pressure sensor: It uses strain-resistance working principle and adopts silicon-sapphire as the semiconductor sensitive element, which has the measurement characteristics. Therefore, semiconductor sensitive components made of silicon-sapphire are not sensitive to temperature changes, and they have very good operating characteristics even under high temperature conditions; sapphire has strong radiation resistance; in addition, silicon-sapphire semiconductor sensitive components have no pn drift.
5. Piezoelectric pressure sensor: The piezoelectric effect is the main working principle of the piezoelectric sensor. The piezoelectric sensor cannot be used for static measurement, because the charge after external force is only saved when the loop has an infinite input impedance . The actual situation is not the case, so this determines that the piezoelectric sensor can only measure dynamic stress.
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