The capaNCDT capacitive displacement sensor is based on the principle of a plate capacitor. The two poles of the capacitor are the sensor and the object to be measured opposite to it. If there is a stable alternating current through the sensor, the voltage of the output alternating current will be proportional to the distance between the sensor and the measured object, so that the distance information can be obtained by measuring the change of the voltage.
Capacitive displacement sensor is a non-contact capacitive principle precision measuring instrument. It has the characteristics of non-friction and non-destructive grinding common to non-contact instruments. It also has large signal-to-noise ratio, high sensitivity, small zero drift and wide frequency response. The utility model has the advantages of small nonlinearity, good precision stability, strong anti-electromagnetic interference capability and convenient operation and the like.
In practical applications, due to the unique magnetic shielding ring design, German Mi Fu's capacitive sensor can achieve near-perfect linear measurement. However, capacitive sensors require that the dielectric between the probe and the object being measured must be uniform and constant. The measurement system is very sensitive to dielectric changes in the measurement range. Capacitive displacement sensors from Germany's rice bran can also be used for the measurement of insulators, which are derived from changes in the dielectric constant in the measurement gap. Through the adjustment of the subsequent circuit, even if the insulator is measured, an almost linear signal output can be obtained. From the electromagnetic conversion process, the capacitive sensor measures all metals. The capacitance measurement system mainly measures the impedance value of the plate resistance, and the impedance value is proportional to the distance between the probe and the object to be measured.
Conventional capacitive sensors emit magnetic lines of force from the sides of the electrodes. This magnetic field can lead to erroneous measurements. German rice bran's capacitive sensor with a grounded shielding ring can effectively reduce the side magnetic field and boundary effects, resulting in more accurate measurement results. Magnetic lines from the grounded shield ring do not affect the measurement results.
High precision measurementThe capacitive measurement principle is one of the most accurate measurement principles. But the problem is that such a small measurement distance can cause the measurement signal to change equally small. That is, there is only a small amount of electrons between the probe and the object being measured that can be used to show the change in distance. This means that if there is little leakage current or parasitic current flowing through the probe to the controller's circuit, it will also affect the accuracy of the measurement results. Therefore, the cable between the probe and the controller requires a special double shielded cable. This special, fully enclosed RF cable guarantees high signal quality. The use of double shielded cables and grounded magnetic shielding technology makes high precision measurements possible.
The conductivity of the measured object changes due to changes in the ambient temperature, and has no effect on the measurement results. The capacitive measurement principle allows the sensor to be used even in fluctuating temperature environments. German rice bran's capacitive sensor probes have a very complex internal structure. As a flat-panel capacitor, the sensor can be mounted on different mechanical structures according to different requirements of customers.
Germany's rice bran capaNCDT capacitive sensor is one of the most accurate displacement sensors in the world. The resolution can reach the nanometer level.
German rice bran's capacitive sensors eliminate the need for recalibration when changing probes. This is undoubtedly greatly convenient for customers. This allows for easy replacement of capacitive sensors and controllers of different ranges without recalibration. It takes only a few seconds to replace a sensor, which is a huge advantage over most sensors on the market. German rice bran also allows non-contact grounding of the object being measured. If two-channel measurements, such as thickness measurements, are used at the same time, the measurements of the two channels must be synchronized. The object to be measured must be grounded. For the capaNCDT series of measurement systems, grounding is done by the controller. And the process is done automatically.
Capacitive measurement principle characteristics:The capacitive measurement principle requires a clean and dry environment, otherwise the change in the dielectric constant between the sensor probe and the measured object will affect the measurement results. We also recommend minimizing the cable length from probe to controller at all times. For standard equipment, equipped with a preamplifier, the cable length is set to 1m, (up to 3m depending on the module selection). If equipped with an external amplifier, the cable length between the probe and the controller can reach 20m.
Capacitive displacement sensors are typically used in applications where high precision is required. They are used to measure vibration, oscillation, expansion, displacement, deflection and deformation and other measurement tasks. Therefore, capacitive displacement sensors are often used as quality assurance.
The latest type of capacitive displacement, the resolution can reach the nanometer level. Due to its superior temperature stability, capacitive sensors are ideal for extreme temperature fluctuations.
Application case: brake disc detectionA typical case of a capacitive displacement sensor is to measure the deformation of the brake disc under stress. In order to get a measurement that is closer to the actual braking situation, the brake disc must be tested under extreme conditions.
The brake disc rotates at 2,000 rpm and the temperature is as high as 600 °C. Only measuring means with high measuring speed or cut-off frequency can not be affected by changes in magnetic and electrical properties of the measured object due to high temperature. The sensor probe also provides a particularly high resolution because the deformation of the brake disc is less than 100 μm. The capacitive displacement sensor from Germany's rice bran is ideal for almost all applications.
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