Basic knowledge of various pressure sensors

The pressure sensor is small in size, relatively light in weight, and high in accuracy, which is conducive to integrated use. It has been widely used in medical fields such as pressure, height, liquid velocity and flow, water conservancy, geology, and chemical industry.Due to the principle of combining plane technology and three-dimensional processing, such as sphygmomanometer, water speed meter, and pressure gauge are the most used and cost-effective sensors.

So, which countries in the world have listed pressure sensor technology as a key development technology? What sensor technologies are currently the research hotspot?

1 Fiber Optic Pressure Sensor

Optical fiber pressure sensor is a sensing technology that uses light as the carrier and optical fiber as the medium to sense and transmit external signal information through the sensor.When the external signal is pressure, it is called a fiber optic pressure sensor. It can measure temperature, pressure, voltage, liquid level, liquid concentration, composition, etc. In addition, it can also constitute an optical fiber distributed pressure sensor.This kind of sensor has obvious advantages with high precision and wide frequency compared with mechanical and electrical types

2 Capacitive vacuum pressure sensor

Capacitive pressure sensor is a precision measuring instrument that converts the measured pressure into an electrical signal output by using capacitive sensitive components.It uses a metallized film or a circular metal film as one of the electrodes of the capacitor.When the film feels the external pressure, deformation is formed, and the capacitance generated between the film and the electrode will change. The measurement circuit can output an electrical signal that is related to the voltage. Divided into single capacitive pressure sensor and differential capacitive pressure sensor.

3 high temperature pressure sensor

When the pressure acts on the diaphragm of the sensor, the diaphragm will produce a micro-displacement proportional to the pressure of the medium, so the resistance of the sensor changes or the electronic circuit detects changes, and the conversion output forms signal information corresponding to this pressure.Device parameters such as the size, thickness and electrode spacing of the diaphragm can effectively improve the sensitivity and linear range of the sensor. Trial used in various industrial automatic control environments, water conservancy and hydropower, intelligent buildings, petrochemicals, oil wells, electric power, ships, furnaces and many other industries.

4 Silicon Micromachined Sensors

Silicon micromachining sensors are more commonly used in the automotive industry today. Micro Electro Mechanical System (MEMS) is a new technology widely used in the 21st century, and silicon micromachining technology is the mainstream technology developed in the field of MEMS.Micro-electromechanical systems are mass-produced, micro-devices or systems that integrate micro-mechanisms, micro-sensors, micro-actuators, signal processing and control circuits, interfaces, communications and power supplies on one or more chips.