If capacitive sensors are used to measure the deformation and displacement of piezoelectric ceramics, the accuracy needs to reach 0.0 1um. Friends who have used capacitive sensors, do you have any recommendations? Because of the precision defined by the measurement module, displacement sensors are usually used to check the dimensional positioning of the center of complex measurement systems. In this respect, high requirements are put forward for the performance and reliability of displacement sensors. Important application fields include accuracy and temperature stability, resolution and cutoff frequency.

This name is especially related to micro and non-contact displacement sensors. They are usually used in applications where almost all displacement changes are obtained, and there is no force to measure objects, in which highly sensitive surfaces do not allow any contact or requirements imposed on long-life sensors (no wear). Compared with today's capacitive displacement sensor, the level of development and production has reached the highest measurement accuracy and reliability.

The measurement method of capacitance displacement is based on the principle of ideal plate capacitor. The change of total capacity caused by the change of plate spacing. Two flat electrodes with a sensor system are formed by a sensor and a target. If a current with alternating constant frequency flows through the sensor capacitor, the amplitude of the alternating voltage on the sensor is proportional to the distance to the target (ground electrode). Through the special calculation of reactance XC of plate capacitor, strict proportional relationship can be obtained without additional linearization. In practice, it is almost ideal that the linear copyright is designed by the sensor as the protective ring of the capacitor. This applies to all metals, regardless of the conductivity of the target.

Compared with the metal with relatively low conductivity of the semiconductor measurement object, it has an adverse effect on the measurement principle because of "insufficient charge transfer in the target". In this case, it can be found that the therapeutic agent is "artificial" in the conductivity of the target by adding appropriate illumination at the measurement point, for example. This effect, called "photoconductivity", can increase the conductivity of the target material, and many dimensions promote the application of capacitive sensors.

Protection ring capacitance principle, in order to realize its largest new product series capaNCDT 6 100, it takes advantage of the corresponding advantages. A wide range of sensors starts from the measuring range of 200 microns, and the displacement of larger models reaches10 mm. When used with compact controller, when the cutoff frequency is 2 kHz and the resolution is 0.0 1%, the value of 6 100 series linear power supply is 0.4%. A power supply voltage of 9-36 V A is necessary. Can output 0-10 v.

(Transferred from Iridium)