I. Different Principles
1. Pressure sensor resistance strain gauge is one of the main components of piezoresistive strain sensors. The working principle of a metal resistance strain gauge is the phenomenon that the resistance of the strain gauge adsorbed on the substrate material changes with mechanical deformation, commonly known as the resistance strain effect.
2. The ceramic pressure sensor is based on the piezoresistive effect. The pressure acts directly on the front surface of the ceramic diaphragm, causing the diaphragm to undergo a slight deformation. A thick-film resistor is printed on the back of the ceramic diaphragm and connected to form a Wheatstone bridge. Due to the piezoresistive effect of the piezoresistive resistor, the bridge generates a highly linear voltage signal that is proportional to the pressure and also proportional to the excitation voltage.
3. The working principle of diffused silicon pressure sensors is also based on the piezoresistive effect. Utilizing the piezoresistive effect, the pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramic), causing the diaphragm to produce a micro-displacement proportional to the medium pressure. This causes a change in the resistance value of the sensor, which is detected by electronic circuitry and converted into a standard measurement signal corresponding to this pressure.
4. The electrical component in a pressure transmitter that senses pressure is generally a resistance strain gauge. A resistance strain gauge is a sensitive device that converts the pressure on the measured object into an electrical signal. The most commonly used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. Metal resistance strain gauges are further divided into wire strain gauges and metal foil strain gauges.
5. Typically, strain gauges are tightly bonded to the substrate that generates mechanical strain using a special adhesive. When the substrate is subjected to stress and the stress changes, the resistance strain gauge also deforms, causing the resistance of the strain gauge to change, which in turn changes the voltage applied across the resistor.
II. Different related applications
1. Pressure sensors are mainly used in: booster cylinders, boosters, gas-liquid booster cylinders, gas-liquid boosters, presses, compressors, air conditioning and refrigeration equipment and other fields.
2. Pressure transmitter:
(1) Intelligent: Due to the emergence of integration, some microprocessors can be added to the integrated circuit, so that the transmitter has functions such as automatic compensation, communication, self-diagnosis, and logic judgment.
(2) Integration: Pressure transmitters are increasingly being integrated with other measuring transmitters to form measurement and control systems. Integrated systems can improve operating speed and efficiency in process control and factory automation.
(3) Miniaturization: The market demand for small pressure transmitters is increasing. These small transmitters can work in extremely harsh environments and require very little maintenance. They have little impact on the surrounding environment and can be placed inside the human body to collect data without affecting people's normal life.
