Views: 2 Author: Site Editor Publish Time: 2022-03-18 Origin: Site
1. Introduction of Diffusion Silicon Pressure Sensor Working Principle The pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramics), causing the diaphragm to produce a micro-displacement proportional to the pressure of the medium, so that the resistance value of the sensor changes, and This change is detected electronically and converted to output a standard measurement signal corresponding to this pressure.
2. Introduction of strain gauge pressure sensors There are many types of mechanical sensors, such as resistance strain gauge pressure sensors, semiconductor strain gauge pressure sensors, piezoresistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, resonant pressure sensors and capacitive acceleration sensors sensors, etc. But the most widely used is the piezoresistive pressure sensor, which has extremely low price, high precision and good linearity.
The piezoelectric materials mainly used in pressure sensors include quartz, potassium sodium tartrate and dicyandiamide phosphate. Among them, quartz is a kind of celestial crystal, and the piezoelectric effect is found in this crystal. Within a certain temperature range, the piezoelectric properties always exist, but after the temperature exceeds this range, the piezoelectric properties are completely disappear (this high temperature is also called the Curie point). Since the power plant changes slightly with pressure (that is, the piezoelectric coefficient is relatively low), quartz is gradually replaced by other piezoelectric crystals. And potassium sodium tartrate has great piezoelectric sensitivity and piezoelectric coefficient, but it can only be used in greenhouses and environments with relatively low humidity. Dicyandiamide phosphate is an artificial crystal that can withstand high temperature and relatively high humidity, so it has been widely used.
Pressure sensor technology has a wide range of applications, and many industries are using sensor technology to improve their production efficiency and quality. For example, in machining, robot manufacturing, etc., these fields all involve sensor technology. Sensor technology is a complex high-tech technology, and its application has an important impact on electromechanical automation control. And with the development of the Internet of Things, the market demand for sensors is also rising.
Pressure sensors can sense the pressure of liquids and gases, which are then converted into electrical signals. It can be used to measure fluid gas flow, velocity, water level and altitude. For example, in the automotive industry, pressure sensors are used in engines to monitor oil and coolant pressure, and pressure sensors are used in vehicle anti-lock braking systems (ABS). In addition, pressure sensors are used in aerospace, shipbuilding, industrial and biomedical instrumentation industries.
Temperature sensors are used to measure the temperature or thermal energy of a given source through an electrical signal. Can be used in manufacturing, agriculture and health industries, etc. In agricultural planting, the growth of crops requires a constant temperature and humidity. The temperature and humidity sensor can monitor the temperature and humidity of the air and soil in the shed at all times to ensure that the system always maintains a constant temperature and provides a good environment for crop growth.
Chemical sensors are used in industrial environmental monitoring and process control to detect harmful, explosive, radioactive and other chemicals, and also in recycling processes in laboratories and the pharmaceutical industry. Various types of chemical sensors include electrochemical gas sensors, chemical field effect transistors, pH glass electrodes, zinc oxide nanorod sensors, and chemical resistors.
Infrared sensors can measure heat and detect the motion of objects, and can be used in fields such as healthcare, electrical appliances, wearable electronic devices, and non-contact-based temperature measurement. Infrared sensors can also be used in environmental inspections as it can detect various types of chemical and thermal leaks.
Sensors increase industrial efficiency and productivity, and the sensor market is expected to grow substantially in the near future. We need to combine the development of smart sensors with AI to further enhance the experience of people, places and things in life.