Vahle switch Germany Vahle model Vahle price

Vahle switch is a switch that uses laser technology for measurement. It consists of a laser, a laser detector, and a measurement circuit. The laser switch is a new type of measuring instrument. Its advantages include the ability to perform non-contact long-distance measurement, high speed, high precision, large measuring range, and strong resistance to optical and electrical interference.

Vahle switch detection principle

Detects magnetic losses caused by eddy currents generated on the surface of a conductor under the influence of an external magnetic field. The method involves generating an alternating magnetic field within the detection coil and detecting the impedance changes caused by eddy currents in the metallic object being detected. In addition, as another method, it includes aluminum detection switches that detect frequency phase components, and all-metal switches that detect only impedance change components through the working coil. A transformer state occurs on the surfaces of the detected object side and the switch side.

Vahle switch classification

1) Capacitive proximity switch: This is a capacitive proximity switch with an electrode as the detection terminal. It consists of a high-frequency oscillation circuit, a detection circuit, an amplification circuit, a shaping circuit, and an output circuit. Normally, there is a certain capacitance between the detection electrode and the ground, which becomes part of the oscillation circuit. When the object being detected approaches the detection electrode, the detection electrode, which is voltage-biased, undergoes polarization due to electrostatic induction. The closer the object is to the detection electrode, the more induced charge accumulates on the electrode. Since the electrostatic capacitance of the detection electrode is C, the capacitance C of the detection electrode increases as the charge increases. Since the oscillation frequency of the oscillation circuit is inversely proportional to the capacitance, when the capacitance C increases, the oscillation of the circuit weakens or even stops. These two states, oscillation and cessation of oscillation, are converted into switch signals by the detection circuit and output externally. 2) Inductive proximity switch: Consists of a high-frequency oscillation circuit, a detection circuit, an amplification circuit, a shaping circuit, and an output circuit. The sensitive element for detection is the detection coil, which is part of the oscillation circuit. The oscillation frequency of the oscillation circuit is . When alternating current flows through the detection coil, an alternating magnetic field is generated around it. When a metal object approaches the detection coil, eddy currents are generated in the metal object, absorbing magnetic energy. This causes the inductance L of the detection coil to change, thereby reducing the oscillation frequency of the circuit until oscillation stops. These two states, oscillation and cessation of oscillation, are converted into switch signals by the monitoring circuit and output. Note: Similar to capacitive proximity switches, inductive proximity switches detect metallic conductors; non-metallic conductors cannot be measured using this method. Amplitude changes vary with the type of metal in the target object, so the detection distance also varies with the type of metal in the target object. 3) Photoelectric proximity switch: The beam axis of the light-emitting diode (or semiconductor laser tube) and the axis of the phototransistor lie in the same plane and form a certain angle, with the two axes intersecting at a point in front of the switch. When the surface of the object being detected approaches the intersection point, the reflected light from the LED is received by the phototransistor, generating an electrical signal. When the object moves away from the intersection point, the reflection area is no longer within the viewing angle of the phototransistor, and the detection circuit produces no output. Generally, the drive current supplied to the LED is not direct current but alternating current of a specific frequency. Thus, the signal received by the receiving circuit is also an alternating signal of the same frequency. Filtering the received signal to allow only signals of the same frequency to pass can effectively prevent interference from other stray light and improve the luminous intensity of the LED.

Vahle switch applications

Proximity switches are mainly used to detect object displacement and are widely applied in aviation, aerospace technology, and industrial production. In daily life, they are used in automatic doors and automatic heaters in hotels, restaurants, and garages. For security and anti-theft purposes, important locations such as archives, accounting departments, financial institutions, museums, and vaults are typically equipped with anti-theft devices composed of various proximity switches. In measurement technology, they are used for length and position measurement; in control technology, they are extensively used for the measurement and control of displacement, speed, and acceleration.

Weidou Intelligent Technology specializes in selling German Vahle switches, Vahle proximity switches, Vahle distance switches, Vahle vision switches, Vahle displacement switches, Vahle weighing switches, Vahle speed switches, Vahle photoelectric switches, Vahle position switches, Vahle angle switches, Vahle tactile switches, Vahle temperature switches, Vahle pressure switches, Vahle flow switches, Vahle level switches, Vahle motion switches, Vahle process switches. Original imports from Germany. Welcome customers to inquire and order.