A413654 Sensor is a very special industry, its output value is not high, in 2019, China’s market size of about 220 billion yuan, but there are tens of thousands of categories, almost all industries and every corner of the national economy. It integrates mechanical, optical and electrical, and can accurately measure pressure, temperature, concentration, speed, etc., but it is subject to the development bottleneck of chips, materials, and circuits. Its principle is transparent, but the process is very complex, is rare in the manufacturing industry with a “craft” atmosphere of industrial products, technical know-how hidden in the process.

China’s sensor industry started late, the lack of core technology, so mainly low-end manufacturing, with the development of intelligent manufacturing, industrial Internet of things, artificial intelligence and other hot in recent years, especially the development of MEMS technology, semiconductor sensors towards micro, low power consumption, high precision direction, sensor industry ushered in the second spring.

Pressure refers to the force that occurs on the contact surface of two objects, and includes the force in different forms, which can be generally divided into three cases: air pressure, hydraulic pressure, and solid pressure. By feeling the pressure signal, the pressure sensor converts the pressure signal into a usable output electrical signal device or device to assist the machine to complete the judgment, thus becoming the cornerstone of the IOT sensing layer technology.

In the past few decades, the automotive A413654 industry has been the main industry driving the demand for pressure sensors, and so far, pressure sensors have been widely used in many fields such as pipeline hydraulics, fire fighting, smart cars, smart medical, aerospace and so on. In 2020, the global pressure sensor market size has reached 1.65 billion US dollars, a total of 10.4 billion yuan, according to the report of Xinsi Industry Research Center, the share of pressure sensors is about 20%, second only to flow sensors.

Pressure sensors can be classified in a variety of ways. According to the working principle, pressure sensing can be divided into piezoelectric type, piezoresistive type, strain type, capacitance type and so on. From the use of materials and sensing principle, there are mainly strain pressure sensor, ceramic pressure sensor, diffused silicon pressure sensor, sapphire pressure sensor, piezoelectric pressure sensor 5 kinds.

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1, strain gauge pressure sensor – the most extensive high precision

A413654 At the heart of a pressure sensor is a resistance strain gauge, a sheet of metal that deforms under stress. When the strain gauge is affected by external force, its length and cross-sectional area will change, and then change the resistance value. For example, when the wire is stretched by external force, its length increases, and the cross-sectional area decreases, and the resistance value will increase.

Strain gauge sensor can measure strain stress, bending moment, torque, acceleration, displacement and other physical quantities, and is also the most widely used in different fields. Especially used in high-precision industrial weighing system products, such as platform scales and hopper weighing systems.

2, ceramic pressure sensor – wear resistance is stable enough

Good elasticity, impact resistance, wear resistance, stable performance… A413654 Ceramic is the rational material of pressure sensor. The ceramic pressure sensor has no liquid transmission, but uses the ceramic directly as the induction diaphragm, so that the pressure indirectly acts on the thick film resistance on the back of the ceramic diaphragm, connected to a Wheatstone bridge, and generates a voltage signal proportional to the pressure and excitation voltage through the bridge after the resistance value changes.

Compared with metal strain gauges, ceramic pressure sensors are the biggest feature of corrosion resistance, in the measurement of corrosive media pressure, such as in the chemical industry, refrigeration and other fields often show their skills. Secondly, ceramic pressure sensors are often composed of layered structures, so they have a better resistance to pressure peaks, but the corresponding sensitivity may not be as good as the former.