Optical full height turngate is a kind of intelligent channel management equipment which uses infrared sensor to identify the information of passers-by and output it as switching signal. It has the characteristics of automatic identification, automatic control, safety and reliability. Due to the dense flow of people and frequent personnel flow in outdoor places, managers need to strengthen management and control when personnel enter and exit to prevent unauthorized personnel and illegal following personnel from entering. So the full height cross turnstile appears more and more frequently in our life. With the development of science and technology, the control system of full height turnstile is constantly updated. At present, the common motion control system of full height cross turngate is mainly composed of three parts, which are infrared sensor, MCU control and communication module.

How optical gates work
The cross optical gate consists of the main body of the gate, the driving device, the transmission device, the limiting device and the photoelectric sensor. The main body of the gate is composed of an upper grid plate, a middle grid plate and a lower grid plate. The driving device is composed of a motor and a reducer. The transmission device is composed of worm gear and sprocket. The limit device is composed of a limit switch and a limit motor. The photoelectric sensor is mainly used to detect the opening state of the gate.

The main body of the gate is a combination of an upper grid plate and a middle grid plate, and the middle grid plate is located between the upper and lower two upper grid plates, on which a plurality of photoelectric sensors are arranged. When the gate is opened, the gate body moves along the track of the upper and lower grid plates, and the photoelectric sensor is fixed on one of the upper grid plates, and the pulse signal sent by it is input into the single chip microcomputer through the control box. The single chip microcomputer processes, analyzes and judges the received pulse signal to determine whether the gate is opened.

Infrared sensor

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.

The infrared sensor is used to detect the working state of the external infrared transmitting tube and transmit the detected signal to the MCU. Through the communication with the control circuit, the MCU receives the signal from the infrared sensor, and controls the motor rotation according to the input signal, so as to realize the motion control of the full height cross turngate. The upper four groups and the lower two groups of infrared sensors are combined to effectively deal with anti-clip and anti-trailing functions. Through calculation, unauthorized personnel can be prevented from illegally following authorized personnel into, and alarm.

MCU control
A single chip computer is an integrated circuit chip. It is the use of very large scale integrated circuit technology to integrate the central processor CPU random access memory RAM, read-only memory ROM, A variety of I/O ports and interrupt systems, timers/timers and other functions (may also include display driver circuit, pulse width modulation circuit, analog multiplexer, A/D converter and other circuits) into a silicon chip A small and perfect microcomputer system, widely used in the field of industrial control.

Communication module
Industrial communication module refers to the connector designed to transmit different signals for the motor in the field of industrial automation control, including the conversion of RS-232, RS-422/485 signals and other communication networks to make the serial messages of the drive, control and actuating components in the system architecture compatible.

RS232 communication mode is adopted between the communication module and the MCU. When the microcontroller receives the pulse signal, it is converted into a digital signal, and then the digital signal is compared with the corresponding pulse frequency, and the motor rotation is controlled according to the comparison results. The single chip microcomputer realizes the control of the motor through programming, such as adjusting the pulse duty cycle. When the motor speed reaches a certain value, the MCU will stop the control of the motor. Because the MCU has rich hardware resources and powerful software functions, it can easily monitor and control the motor in real time.

I hope the above information can help you understand more about the composition and function of the motion control system of the full height cross turnstile. If you want to know more about the photoelectric sensor, safety light curtain, LiDAR product applications, you can also email us. With 20 years of experience in the safety photoelectric sensor industry, G-TEK insists on providing customers with the most suitable and reliable photoelectric sensor solutions.