Proximity sensor is a general term for sensors that replace touch detection systems such as limit switches and aim at detecting objects without touching them. It converts the moving and possessive messages of the detected target into electrical signals.
In the detection preparation of the conversion into electrical signals, it includes the preparation of the eddy current generated in the metal body of the detection target provoked by manipulation, the preparation of the capacity change of the electrical signal caused by the proximity of the capture body, and the preparation of the sharp stone and the guidance switch. It is composed of type, capacitance type, ultrasonic type, photoelectric type, magnetic type, etc.
The proximity sensor is an alternation generated by the manipulation of the oscillator, and when the metal policy approaches this and reaches the distance, eddy currents are generated within the metal policy, thus causing the oscillator of the proximity sensor to stop. The changes in the oscillator oscillation and stopping vibration of the proximity sensor are electronically disposed of by the amplifier and converted into a switching signal, which triggers the drive control device, so as to reach the target of the non-touch detection of the proximity sensor. That's how proximity sensors work.
Craftsmanship is inferior
(1) Since it can be detected with a non-touch weave, it will not wear and damage the test target.
(2) Due to the selection of contactless output preparation, the life delay (except for magnetic type) selects semiconductor output, and the life of the docking point has no effect.
(3) It is not compatible with the light detection preparation, and is suitable for use under water and oil, etc., and is not affected by the stains, oil and water of the detection target. In addition, it also contains Teflon shell type and products with excellent chemical resistance.
(4) Compared with touch switches, it can achieve high-speed response.
(5) It can cope with the general temperature range.
(6) Not affected by the color of the detected object: It detects the change in the quantity of the detected target, so it is not affected by the approximate color.
(7) It is not compatible with the touch type, and it will be affected by the surrounding temperature, surrounding objects, and similar sensors, including the type and capacitance type, and the sensors will affect each other. Therefore, it is necessary to consider mutual interference with the setting of sensors. In addition, in the capacitive type, the influence of the surrounding metals needs to be considered, while in the capacitance type, the influence of the surrounding objects is considered.
When the metal detector is close to the area of the sensor, the switch can be no touch, no pressure, no sparks, agile announcement of electrical commands, accurately reflect the activity organization and stroke, even if used for general travel control, its positioning accuracy, operation frequency, service life, convenience of installation and adjustment and the ability to use harsh can not be compared with the general mechanical travel switch.
Classification of proximity sensors
Proximity sensors are divided into the following according to the working principle:
High-frequency oscillation type, capacitive type, bridge type, eternal magnet type and Hall effect type, etc.
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