(1) Solutions:
The proximity sensors in the tripod turnstile gates is a highly sensitive sensor that is mainly used to detect metallic substances and give an output signal. The proximity sensor mainly plays a limiting role in the tripod turnstile gate. The movement of the three-roller gate is a metal disk with three recessed parts, and the proximity sensor is installed on one side of the movement.

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(2) Solutions:
The principle of infrared sensor is to use infrared light-emitting diodes to receive and convert the infrared light emitted by the object into an electrical signal, because the wavelength of the infrared light emitted by the object is generally between 10 and 100 microns, which makes these light can not be directly received. However, when the object passes through the infrared sensor at a certain speed, because the surface of the object will emit a certain wavelength of infrared light, and the infrared wavelength is much longer than the visible wave length, when the infrared emitted by the surface of the object will be received by the photoelectric device when the detector is converted into an electrical signal. Photoelectric devices are used to receive this signal and convert it into an electrical signal to control the opening and closing of the gate.
Because this sensor can effectively overcome the harm caused by other factors to the human body, it is widely used in many fields.

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