Germany TELCO sensor TELCO model TELCO price

TELCO sensors are measurement feedback devices that operate based on the optical principle of gratings. Grating scales are frequently used in the closed-loop servo systems of CNC machine tools and can be used for detecting linear or angular displacement. The measurement output signal is a digital pulse, characterized by a large detection range, high detection accuracy, and fast response speed. For example, in CNC machine tools, they are often used to detect the coordinates of tools and workpieces to observe and track tool path errors, thereby compensating for tool motion errors. Depending on the manufacturing method and optical principle, grating scales are divided into transmission gratings and reflection gratings.

TELCO sensor detection principle

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

TELCO sensor classification

1) Capacitive proximity sensor: This is a capacitive proximity switch with an electrode as the detection terminal. It consists 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 ground, which becomes part of the oscillation circuit. When the detected object approaches the detection electrode, the voltage applied to the electrode causes electrostatic induction and polarization. The closer the object gets 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 increases as the charge increases. Because the oscillation frequency of the oscillation circuit is inversely proportional to the capacitance, an increase in capacitance C weakens the oscillation, potentially stopping it entirely. The two states of oscillation and non-oscillation are converted by the detection circuit into a switch signal for output. 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 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 and causing the inductance L of the detection coil to change. This reduces the oscillation frequency of the circuit, potentially stopping oscillation. The states of oscillation and non-oscillation are converted by the monitoring circuit into a switch signal 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 with the type of metal in the target object, so the detection distance also varies with the metal type. 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 specific angle, with the two axes 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 LED is received by the phototransistor, generating an electrical signal. When the object moves away from the intersection point, the reflection area falls outside the phototransistor's field of view, 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 receiving circuit also receives an alternating signal of the same frequency. Filtering the received signal to allow only signals of the same frequency to pass effectively prevents interference from other ambient light and can increase the luminous intensity of the LED.

TELCO sensor applications

Proximity sensors are primarily 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 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 measuring length and position; in control technology, they are widely used for measuring and controlling displacement, speed, and acceleration.

Weidou Intelligent Technology specializes in selling German TELCO sensors, TELCO proximity sensors, TELCO distance sensors, TELCO vision sensors, TELCO displacement sensors, TELCO torque sensors, TELCO speed sensors, TELCO photoelectric sensors, TELCO position sensors, TELCO angle sensors, TELCO tactile sensors, TELCO temperature sensors, TELCO pressure sensors, TELCO flow sensors, TELCO level sensors, TELCO motion sensors, TELCO process sensors. Original German imports. Welcome inquiries and orders from customers.