Germany CAEM sensor CAEM model CAEM price

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

CAEM sensor detection principle

Magnetic losses caused by eddy currents generated on the surface of the conductor are detected through 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 produced in the metallic body of the target. In addition, 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 detection target side and the sensor side.

CAEM 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 the ground, which becomes part of the oscillation circuit. When the detected object approaches the detection electrode, the electrode, being voltage-biased, undergoes polarization due to electrostatic induction. 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 of the detection electrode increases as the charge increases. Because the oscillation frequency of the oscillation circuit is inversely proportional to the capacitance, when the capacitance C increases, the oscillation weakens or even stops. These two states, oscillation and cessation of oscillation, are converted by the detection circuit into switch signals 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 L. When AC 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 energy. This causes the inductance L of the detection coil to change, thereby reducing the oscillation frequency of the circuit until it stops oscillating. These two states, oscillation and cessation, are converted by the monitoring circuit into switch signal outputs. 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 depending on 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, 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 DC but an 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.

CAEM sensor applications

Proximity sensors 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 measurements; in control technology, they are extensively used for measuring and controlling displacement, speed, and acceleration.

Weidou Intelligent Technology specializes in selling German CAEM sensors, CAEM proximity sensors, CAEM distance sensors, CAEM vision sensors, CAEM displacement sensors, CAEM torque sensors, CAEM speed sensors, CAEM photoelectric sensors, CAEM position sensors, CAEM angle sensors, CAEM tactile sensors, CAEM temperature sensors, CAEM pressure sensors, CAEM flow sensors, CAEM level sensors, CAEM motion sensors, and CAEM process sensors. All products are original imports from Germany. Customers are welcome to inquire and place orders.