The inductive sensor consists of three major components: an oscillator, a switching circuit, and an amplifying output circuit. The oscillator produces an alternating magnetic field. When the metal target approaches this magnetic field and reaches the sensing distance, eddy currents are generated in the metal target, causing the oscillation to decay and even stop.
The oscillation and oscillation of the oscillator are processed by the post-amplifier circuit and converted into a switching signal to trigger the drive control device to achieve the non-contact detection purpose.
2, the working principle of capacitive proximity switch
The sensing surface of the capacitive proximity switch consists of two coaxial metal electrodes, much like an "open" capacitor electrode, which form a capacitor that is connected in series in the RC tank.
When the power is turned on, the RC oscillator does not oscillate. When a target approaches the capacitor, the capacity of the capacitor increases and the oscillator begins to oscillate. Through the processing of the latter circuit, the two signals of the vibration and the oscillation are converted into a switching signal, thereby detecting the presence or absence of an object. The sensor can detect metal objects and can detect non-metallic objects. The maximum working distance can be obtained for metal objects. The working distance of non-metallic objects is determined by the dielectric constant of the material. The larger the dielectric constant of the material, the available action. The greater the distance.
3, the working principle of the Hall switch
A magnetic switch is a proximity switch that responds to a permanent magnetic field (even through non-ferrous metals). The working distance is greater than the inductance proximity switch. The response curve is related to the direction of the permanent magnetic field.
When a target (permanent magnet or external magnetic field) approaches, the magnetic permeability of the coil core (the inductance L of the coil is determined by it) becomes smaller, the inductance of the coil also decreases, and the Q value increases. The excitation oscillator oscillates and the oscillating current is increased. When a magnetic target approaches, the current consumption of the magnetic sensor increases.
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