The proximity sensor is a general term for a sensor that is intended to be detected without a touch detection policy, such as a touch detection method such as an alternative limit switch. It can convert the movement information and presence information of the detection policy into electrical signals.
In the method of detecting an electrical signal, a method of using an eddy current generated in a metal body using a detection policy by electromagnetic induction, a method of changing a capacity of an electrical signal caused by a proximity of a measuring body, a method of guiding a rock, and a method of guiding a switch . It consists of an inductive type, an electrostatic capacity type, an ultrasonic type, a photoelectric type, and a magnetic type.
The proximity sensor is an alternating magnetic field that uses the vibrator to attack. When the metal policy approaches the magnetic field and reaches the sensing distance, the eddy current occurs in the metal policy, thereby causing the vibration to attenuate, so that the vibrator close to the sensor stops. The vibration of the vibrator of the proximity sensor and the change of the vibration stop are processed by the post-stage expansion circuit and converted into a switching signal, which triggers the intention of driving the control device and thus reaching the non-touch detection of the proximity sensor. This is how the proximity sensor works.
1 Since it can be detected in a non-touch method, it does not wear and damage the detection policy.
2 Because the contactless output method is selected, the life extension (except for the magnetic type) uses the semiconductor output, which has no effect on the life of the joint.
3 Unlike the light detection method, it is suitable for use in water and oil environments where it is not affected by stains, oil and water. In addition, it also contains Teflon shell type and excellent drug resistant products.
4 High-speed response is achieved compared to touch switches.
5 Can correspond to a wide range of temperatures.
6 Unaffected by the color of the detected object: The physical property change of the detection policy is detected, so it is not affected by the appearance color or the like.
7 Unlike the touch type, it is affected by ambient temperature, surrounding objects, and similar sensors. Including the inductive type and electrostatic capacity type, the sensors affect each other. Thus, with regard to the settings of the sensors, the requirements consider interference with each other. In addition, in the inductive type, the demand considers the influence of the surrounding metal, while in the electrostatic capacity type, the influence of the surrounding objects needs to be considered.
When the metal detector is close to the sensing area of ​​the sensor, the switch can be touchless, without pressure, without spark, agilely announcing electrical commands, accurately reflecting the orientation and stroke of the moving tissue, that is, applied to general stroke control, its positioning accuracy, operating frequency The use of the number of life, the convenience of device adjustment and the ability to adapt to harsh environments are all comparable to the general mechanical travel switch.
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