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EMEINSA 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 to detect 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 transmissive gratings and reflective gratings.

EMEINSA sensor detection principle

Detection is performed by detecting magnetic losses caused by eddy currents generated on the surface of a conductor under the influence of an external magnetic field. This method involves generating an alternating magnetic field within a detection coil and detecting changes in impedance 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.

EMEINSA 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, 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 detected object approaches the detection electrode, the electrode, being 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. 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 non-oscillation, are converted by the detection circuit into a switch signal for output. 2) Inductive proximity sensor: 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 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 oscillation and non-oscillation states 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.

EMEINSA sensor applications

Proximity sensors are primarily 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 measuring length and position; in control technology, they are used for measuring and controlling displacement, speed, and acceleration, utilizing a large number of proximity switches.

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