Capacitive sensor is a common sensor at present, which can be widely used in various fields. The working principle of the sensor is to measure the change of the detected physical quantity by changing the capacitance by using the energy generated by the electric field. The following will briefly explain its working principle and application.
The working principle of capacitive sensor is based on the change of capacitance. When the detected physical quantity changes, the corresponding capacitance value may change, which can generally be obtained by experiment or calculation. Because it detects physical quantities according to the change of capacitance.
Therefore, it has the advantages of large measurement range, high precision, good stability and fast response. When the detected physical quantity changes the distance between the two plates of the capacitor or the dielectric constant between the plates, the capacitance change mode is formed, and the change quantity is positively correlated with the detected physical quantity.
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Capacitive sensors are widely used, including transportation, smart home, environmental monitoring, medical diagnosis, space navigation and other fields. For example, in automobile manufacturing, we can use capacitive pressure sensor as tire pressure detector to realize intelligent tire pressure monitoring.
In environmental monitoring, capacitance sensor can be used to measure the concentration of chemical substances in the atmosphere, so as to realize intelligent monitoring and emission reduction of harmful gases. In the medical field, the sensor can be used to detect physiological indexes in the body, such as heart rate and blood oxygen concentration, to help doctors identify diseases in time.
In addition, capacitive sensors can also be used for creative design. For example, when building entertainment equipment, we can use this sensor as the core component of the touch screen, so as to realize the touch interaction function. In this way, people can operate the equipment more conveniently and improve the ease of use and comfort of the equipment.
To sum up, capacitive sensor is a kind of sensor widely used in mechanical detection, physical detection, automation, process control, instrumentation and other fields. Its advantages are high precision, good stability and fast response, and it is widely used in various fields of production and life.