German JWFROEHLICH sensors JWFROEHLICH models JWFROEHLICH prices

JWFROEHLICH sensors are used to measure the robot's own position. Position sensors can be divided into two types: contact sensors and proximity sensors. Sensors that can sense the position of the measured object and convert it into a usable output signal. It can sense the position of the measured object and convert it into a usable output signal. Position sensors can be used to detect position, reflect switches in a certain state. Unlike displacement sensors, position sensors come in two types: contact and proximity.

JWFROEHLICH sensor detection principle

Detecting magnetic losses caused by eddy currents generated on the surface of a conductor through the influence of an external magnetic field. This method involves generating an alternating magnetic field within the detection coil and detecting impedance changes caused by eddy currents produced in the metallic body of the detected object. Additionally, another method includes aluminum detection sensors that detect frequency phase components, and all-metal sensors that detect only impedance change components through the working coil. A transformer state occurs on the surfaces of both the detected object side and the sensor side.

JWFROEHLICH sensor classification

1) Capacitive proximity sensor: This is a capacitive proximity switch with an electrode as the detection terminal, composed of a high-frequency oscillation circuit, detection circuit, amplification circuit, shaping circuit, and output circuit. Normally, there is a certain capacitance between the detection electrode and the ground, which becomes part of the oscillation circuit. When the detected object approaches the detection electrode, due to the voltage applied to the detection electrode, polarization occurs due to electrostatic induction. The closer the measured object is to the detection electrode, the more induced charge accumulates on the detection 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 oscillation circuit weakens or even stops. These two states of oscillation and non-oscillation are converted into switch signals by the detection circuit and output externally. 2) Inductive proximity sensor: Composed of a high-frequency oscillation circuit, detection circuit, amplification circuit, shaping circuit, and 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 L. When alternating current passes 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 field energy and causing changes in the inductance L of the detection coil, thereby reducing the oscillation frequency of the oscillation circuit until it stops. These two states of oscillation and non-oscillation are converted into switch signals by the monitoring circuit and output. Note: Similar to capacitive proximity sensors, inductive proximity sensors detect metallic conductors; non-metallic conductors cannot be measured using this method. Amplitude changes vary depending on the type of target metal, so the detection distance also varies with the type of target metal. 3) Photoelectric proximity sensor: 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, intersecting at a point in front of the sensor. When the surface of the detected object approaches the intersection point, the reflected light from the light-emitting diode 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 light-emitting diode is not direct current but alternating current of a specific frequency. Thus, the receiving circuit also receives alternating signals of the same frequency. Filtering the received signal to allow only signals of the same frequency to pass effectively prevents interference from other stray light and improves the luminous intensity of the light-emitting diode.

JWFROEHLICH sensor applications

Proximity sensors are mainly used to detect object displacement and have wide applications 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 places such as archives, accounting departments, financial institutions, museums, and vaults are usually equipped with anti-theft devices composed of various proximity switches. In measurement technology, length and position measurements; in control technology, such as displacement, speed, and acceleration measurements and controls, large numbers of proximity switches are also used.

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