Introduction To Pressure Sensors

Pressure sensor is a device or device that can sense the pressure signal and convert the pressure signal into an available output electrical signal according to a certain law.

The pressure sensor usually consists of a pressure sensing element and a signal processing unit. Pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors.

Pressure sensor is the most commonly used sensor in industrial practice, widely used in a variety of industrial automatic control environment, involving water conservancy, hydropower, railway traffic, intelligent buildings, production automatic control, aerospace, military, petrochemical, oil Wells, electric power, ships, machine tools, pipelines and other industries. Here are some common sensor principles and their applications. There's also a medical pressure sensor.

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Pressure sensor is one of the most widely used sensors. The traditional pressure sensor is mainly a mechanical structure device, the deformation of the elastic element indicates the pressure, but the structural size is large, the mass is heavy, and the electrical output cannot be provided. With the development of semiconductor technology, semiconductor pressure sensors have also emerged. It is characterized by small size, light weight, high accuracy and good temperature characteristics. Especially with the development of MEMS technology, semiconductor sensors have developed to miniaturization, low power consumption and high reliability.

1. Diffusion silicon pressure transmitter.

Diffused silicon pressure transmitters are made by packaging isolated silicon piezoresistive pressure sensitive elements in a stainless steel housing. It can convert the perceived liquid or gas pressure into a standard electrical output.

2. Semiconductor piezoresistive type.

The semiconductor piezoelectric impedance diffusion pressure sensor forms a semiconductor deformation pressure on the surface of the wafer, and deforms the wafer by external force (pressure), resulting in a piezoelectric impedance effect, and converts the impedance change into an electrical signal.

3. Electrostatic capacity type.

The electrostatic capacity pressure sensor is to form a capacitance between the fixed pole of glass and the movable pole of silicon, and convert the electrostatic capacity change caused by the deformation of the movable pole into an electrical signal.