Operating principle of pressure sensor

Post Date January, 28 2023

Ceramic pressure sensor: ceramic pressure sensor is based on the piezoresistive effect. The pressure directly acts on the front surface of the ceramic diaphragm, causing slight deformation of the diaphragm. The thick film resistance is printed on the back of the ceramic diaphragm and connected to a Wheatstone bridge. Due to the piezoresistive effect of the piezoresistor, the bridge generates a highly linear voltage signal proportional to the pressure and the excitation voltage, The standard signal is calibrated as 2.0/3.0/3.3 mV/V according to the different pressure ranges, which can be compatible with strain sensor.

Diffused silicon pressure sensor: The working principle of the diffused silicon pressure sensor is also based on the piezoresistive effect. Using the piezoresistive effect principle, the pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic), making the diaphragm produce a micro-displacement proportional to the medium pressure, making the resistance value of the sensor change. The electronic circuit is used to detect this change and convert and output a standard measurement signal corresponding to this pressure.

Sapphire pressure sensor: based on the working principle of strain resistance type, using silicon-sapphire as semiconductor sensing element, it has unparalleled metrological characteristics. Therefore, semiconductor sensitive elements made of silicon-sapphire are insensitive to temperature changes, and have good working characteristics even under high temperature conditions; Sapphire has strong radiation resistance; In addition, the silicon-sapphire semiconductor sensor has no p-n drift.
Piezoelectric pressure sensor: Piezoelectric effect is the main working principle of piezoelectric sensor. Piezoelectric sensor cannot be used for static measurement, because the charge after external force is saved only when the circuit has infinite input impedance. This is not the case in practice, so this determines that piezoelectric sensors can only measure dynamic stress.Pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial automation environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, electric power, ships, machine tools, pipelines and many other industries. And in different environments, different types of pressure sensors need to be used to avoid errors.

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