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What is the working principle of the pressure sensor?
Publish Time：
2025-08-14
The pressure sensor is an important electronic device. Its main function is to convert the pressure signal into a processable electrical signal, such as voltage or current signal.
The pressure sensor is an important electronic device. Its main function is to convert the pressure signal into a processable electrical signal, such as voltage or current signal.
The pressure sensor is an important electronic device. Its main function is to convert the pressure signal into a processable electrical signal, such as voltage or current signal. Its working principle is based on some physical effects, including piezoresistance effect, piezoelectric effect, etc. The following is a detailed introduction to the working principle of the pressure sensor.
The working principle of the pressure sensor mainly depends on its internal sensitive elements. These sensitive elements are usually made of some special materials, such as metal resistor, piezoelectric crystal, etc. They deform when external pressure is applied to these elements. This deformation can further affect the value of its internal resistance or produce a voltage that changes the output electrical signal.
In particular, piezoresistance is a common pressure sensing principle. In this effect, the metal resistance varies with the external pressure and its resistance value also changes. When the metal resistance inside the pressure sensor is stressed, it will be slightly deformed, resulting in the change of the resistance value. This change in the resistance value is converted into a voltage or current signal, which converts the pressure into an electrical signal.
In addition, piezoelectric effect is also a common working principle of pressure sensor. When a piezoelectric crystal is under pressure, it generates charges inside the crystal, thus forming a voltage signal. This effect enables the pressure sensor to convert the pressure signal into a measurable voltage signal.
In addition to the above two principles, there are other pressure sensing principles, such as capacitive pressure sensing, strain gage technology, etc. Capacitive pressure sensor mainly changes capacitance value of capacitor through external pressure, and then generates electrical signal. The strain gauge technique obtains the pressure value by measuring the strain generated by the pressure.
In general, the working principle of a pressure sensor mainly depends on its internal sensitive components, which will deform or undergo other physical changes when exposed to external pressure, thus generating electrical signals. These electrical signals can be measured and recorded to measure and monitor the pressure. Due to its high accuracy, fast response and good stability, the pressure sensor is widely used in various fields, such as automobile, industry, aerospace, etc.
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Nanjing Wotian Technology Co., Ltd. was established in 2005. It is a national high-tech enterprise, a private technology enterprise in Jiangsu Province, a national level specialized and innovative "little giant" enterprise, and an excellent private enterprise in Jiangning District; The company has been rated as Jiangsu Engineering Technology Research Center, Nanjing Engineering Research Center, Nanjing Enterprise Technology Center, and Nanjing Postdoctoral Innovation Demonstration Base; It is the unit responsible for formulating three national standards.
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