What are the characteristics of capacitive sensors?

1. Good temperature stability

Capacitive sensorThe capacitance value is generally independent of the electrode material and depends only on the geometric dimensions of the electrode. In addition, the loss of dielectric materials such as air is very small. Therefore, as long as the mechanical properties such as strength and temperature coefficient are considered, the material and structural dimensions can be reasonably selected. Other factors (due to their minimal heat generation) have little impact.And resistive sensors have resistance, which generates heat after power supply;Inductive sensorThere are copper losses, magnetic losses, and eddy current losses, which cause zero drift due to self heating.

2. Simple structure and strong adaptability

Capacitive sensorSimple structure, easy to manufacture, easy to ensure high precision, capable of working in various harsh environmental conditions such as high temperature, low temperature, strong radiation, and strong magnetic field, with strong adaptability. Especially capable of withstanding large temperature changes, it can work normally under high pressure, high impact, and overload conditions, measure high and low pressure differentials, and also measure magnetic workpieces. In addition,sensorIt can be made very small in size to achieve measurements with special requirements.

3. Good dynamic response

Capacitive sensorIn addition to its high natural frequency and short dynamic response time, the system operates at a high frequency due to its low dielectric loss and ability to supply power at higher frequencies. Can be used to measure parameters of high-speed changes, such as measuring vibration, instantaneous pressure, etc.

4. Can achieve non-contact browsing volume with average effect

When the tested object cannot be measured by contact,Capacitive sensorCan complete the measurement task. When non-contact measurement is used, capacitive sensors have an averaging effect, which can reduce the influence of workpiece surface roughness and other factors on the measurement.

Capacitive sensorIn addition to the above advantages, due to the small electrostatic attraction between the charged plates, the required input force and energy are extremely low, so it can measure extremely low pressure, force, acceleration, displacement, etc. It can be made very sensitive, with high resolution, and can be sensitive to displacements of 0.01 um or even smaller; Due to its low loss of air and other media, the zero residue generated when using a differential structure and connecting it into a bridge is extremely small. Therefore, it allows the circuit to perform high magnification amplification, making the instrument highly sensitive.