Working Principle of Baruff Displacement Sensor
The sensor slideway connects the steady-state DC voltage, permits a small current flowing through the micro ampere, and the voltage between the slider and the starting end is proportional to the length of the slider moving. Using sensor as divider can greatly reduce the requirement for accuracy of total resistance of slideway, because the change of resistance caused by temperature change will not affect the measurement results.
advantage
High resolution, high repeatability and high linearity
Anti-vibration and Anti-interference Field
application
Detection of piston position in hydraulic drive devices (e.g. wind power generation equipment)
Monitoring Linear Motion in Injection Molding Machine or Machining Center
Monitor material level in batching and mixing unit
Principle of Capacitance Displacement Sensor
CapaNCDT capacitive displacement sensor is based on the principle of plate capacitance. The two poles of the capacitor are the sensor and the object to be measured. If there is stable alternating current passing through the sensor, the voltage of output alternating current will be proportional to the distance between the sensor and the measured object, thus distance information can be obtained by measuring the change of voltage.
Capacitive displacement sensor is a precise measuring instrument based on non-contact capacitive principle. It has the characteristics of non-friction and non-wear common to non-contact instruments. Besides, it also has the advantages of high signal-to-noise ratio, high sensitivity, small zero drift, wide frequency response, small nonlinearity, good precision stability, strong anti-electromagnetic interference ability and easy operation.
In practical application, due to the unique design of magnetic shielding ring, the capacitive sensor of German miiridium can achieve nearly perfect linear measurement. However, capacitive sensors require that the dielectrics between the probe and the measured object must be uniform and constant. The measurement system is very sensitive to the dielectric change in the measurement range. German miiridium capacitive displacement sensors can also be used to measure insulators, because these insulators change the dielectric constant in the measurement gap. By adjusting the following circuit, the almost linear signal output can be obtained even if the insulator is measured. From the electromagnetic conversion process, capacitive sensors can measure all metals. The capacitance measurement system mainly measures the impedance value of the plate resistance, which is proportional to the distance between the probe and the measured object.
Traditional capacitive sensors emit magnetic lines from the side of the electrodes. This magnetic field can lead to erroneous measurements. German miiridium capacitive sensor with a grounding shielding ring can effectively reduce side magnetic field and boundary effect, so as to obtain more accurate measurement results. The magnetic lines emitted from the earth shielding ring will not affect the measurement results.
High Precision Measurement
Capacitance measurement principle is one of the most accurate measurement principles. But the problem is that such a small measurement distance can cause the same small change in the measurement signal. That is to say, only a small amount of electrons between the probe and the object under test can be used to show the change of distance. This means that if there is a small leakage current or parasitic current flowing through the probe to the controller circuit, it will also affect the accuracy of the measurement results. Therefore, the cable between probe and controller needs special double shielded cable. This special, fully enclosed RF cable ensures high signal quality. The use of double shielded cable and grounding magnetic shielding technology makes it possible to measure with high accuracy.
Because of the change of ambient temperature, the change of electrical conductivity of the measured object has no effect on the measurement results. The principle of capacitive measurement enables sensors to be used even in fluctuating temperature environments. German miiridium capacitive sensor probe has a very complex internal structure. As a flat capacitor, sensors can be installed on different mechanical structures according to different requirements of customers.
CapaNCDT capacitive sensor of Iridium in Germany is one of the most accurate displacement sensors in the world. The resolution can reach nanometer level.
The capacitive sensor of iridium can replace the probe without re-calibration. This undoubtedly greatly facilitates customers. This makes it easy to replace capacitive sensors and controllers with different ranges without re-calibration. Replacement of a sensor takes only a few seconds, which is a huge advantage over most sensors on the market. German company Miridium also allows non-contact grounding of the object under test. If two-channel measurements, such as thickness measurements, are used simultaneously, the measurements of the two channels must be synchronized. The object under test must be grounded. For capaNCDT series measurement system, the grounding work is completed by the controller. The process is automated.
Principle and characteristics of capacitive measurement:
The principle of capacitive measurement requires a clean and dry environment. Otherwise, the change of dielectric constant between the sensor probe and the measured object will affect the measurement results. We also recommend that the cable length between the probe and the controller be minimized at all times. For standard equipment, it is equipped with preamplifier and cable length is set to 1m (up to 3m according to different modules). If equipped with an external amplifier, the cable length between the probe and the controller can reach 20m.
Capacitive displacement sensors are generally used in applications requiring high accuracy. They are used to measure vibration, oscillation, expansion, displacement, deflection and deformation. Therefore, capacitive displacement sensors are often used as quality assurance.
New capacitive displacement, resolution can reach nanometer level. Because of the super temperature stability, capacitive sensor is the ideal choice in the case of severe temperature fluctuation.
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