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The front-end high-frequency oscillating current flows into the probe coil through the extension cable, and generates an alternating magnetic field in the coil of the probe head. When the measured metal body is close to this magnetic field, an induced current is generated on the metal surface. At the same time, the eddy current field also generates an alternating magnetic field in a direction opposite to the direction of the head coil. Due to its reaction, the head coil is high. The amplitude and phase of the frequency current are changed (effective impedance of the coil). This variation is related to parameters such as permeability of the metal body, conductivity, geometry of the coil, geometry, current frequency, and distance from the head coil to the surface of the metal conductor. related. The displacement sensor can accurately measure the static and dynamic relative displacement changes between the measured body (must be a metal conductor) and the end face of the probe. In the state analysis, vibration research, and analysis of high-speed rotating machinery and reciprocating motion machinery, various parameters of rotor vibration state can be continuously and accurately acquired for non-contact high-precision vibration and displacement signals. Such as shaft radial vibration, amplitude and axial position.
From the theoretical analysis of rotor dynamics and bearing science, the state of motion of a large-scale rotating machine mainly depends on its core-axis, while the electric displacement sensor can directly measure the state of the shaft without contact, such as imbalance and misalignment of the rotor. Early identification of mechanical problems such as bearing wear, shaft cracks, and friction can provide critical information. The eddy current sensor has the advantages of long-term operation reliability, wide measurement range, high sensitivity, high resolution, fast response, strong anti-interference force, free from the influence of oil and other media, simple structure, etc., in the state of large rotating machinery. Online monitoring and fault diagnosis are widely used.
The function of the FESTO displacement sensor is to convert the linear mechanical displacement into electrical signals. In order to achieve this effect, the variable resistance slide rail is usually set at a fixed position of the sensor, and different resistance values ​​are measured by the displacement of the slide plate on the slide rail. The sensor rail is connected to a steady-state DC voltage, allowing a small current to flow through microamperes, and the voltage between the wiper and the start is proportional to the length of the slider movement. The use of a sensor as a voltage divider minimizes the need for precision in the total resistance of the slide rail, because changes in the resistance caused by temperature changes do not affect the measurement results.
Displacement sensors, also known as linear sensors, are divided into inductive displacement sensors, capacitive displacement sensors, photoelectric displacement sensors, ultrasonic displacement sensors, Hall-type displacement sensors. The displacement sensor has no sliding contact, is not affected by dust and other non-metallic factors during operation, and has low power consumption, long life, and can be used in various harsh conditions. Displacement sensor is mainly used in intelligent control of analog quantity in automation equipment production line
The basic principle of FESTO displacement sensor
Basic principle of FESTO displacement sensor According to Faraday's principle of electromagnetic induction, when a massive metal conductor is placed in a changing magnetic field or when a magnetic field is moved in a magnetic field, a vortex-like induced current will be generated in the conductor. This current is called eddy current. The above phenomena are called eddy current effects. The sensor made by the eddy current effect is called an eddy current sensor.