Safety detection function of photoelectric sensors

The photoelectric sensor itself is a common sensing device. Depending on the operating principle, photoelectric sensors are broadly classified into 3 types. They are the counter-reflective photoelectric sensor, reflective photoelectric sensor and diffuse reflective photoelectric sensor. Passage gates because of its fast passage speed, high sensitivity requirements, usually installed with high precision induction photoelectric sensor. Semi-automatic three roller gates are installed with proximity sensors or diffuse reflection photoelectric sensors.

What is a pair of photoelectric sensors?
A photoelectric switch composed of an emitter and a receiver is called a pair of separate photoelectric switch, or a pair of photoelectric sensors. Its detection distance can reach several meters or even tens of meters. When using the emitter and receiver are installed on both sides of the detection path. Detection object through when blocking the optical path, the receiver action output a switch control signal. This is how the pair of photoelectric sensors work in the speed gate.

How to use photoelectric sensors for security detection?

A high quality gate will usually be sensing area will be divided into four parts: starting sensing detection area, safety anti-pinch detection area, channel tracking detection area and low safety detection area. The starting sensing detection area at each end is composed of 2 pairs of infrared sensors. From the pedestrian swipe card into the gate will enter the induction area. Once the starting induction detection area senses the follower, immediately feedback signal to the center to master the system to start the prevention function. Channel tracking detection area consists of a total of four pairs of infrared sensors at both ends of the channel. Sensing the location and movement of people in the process of passage, multi-point infrared sensors can effectively detect people tracking the movement and location of people passing and appropriate supply feedback to the mastering system. Safety anti-pinch detection area consists of 4 pairs of infrared sensors for detecting the state of people or objects in the active area of the door wing in the channel. Low-level security detection zone consists of 2 pairs of infrared pair sensors. It is used to detect whether there are luggage, trolleys and smaller children in the passage.

Safety prevention function of photoelectric sensor

1. Anti-ambush, anti-crossing, anti-forced entry
High-level sensors in addition to the normal passage detection function, but still effective in preventing overturning. Low infrared detection grating collaboration acrylic baffle use, can effectively prevent ambush. Minimum 120NM locking torque, effectively prevent people from forcible entry.
2. Anti-following
Equipped with infrared sensor system, after the person enters the channel, the whole process of the passage of the person can be precisely located, sensing the passage status. After the discovery of non-authorized personnel following ( distance ≥ 40cm), according to customer requirements, the door can quickly swing back the wings to block non-authorized personnel outside the channel to prevent their entry, and start the alarm system.

3. Anti-door wing pinching
The speed pass door is equipped with 6 pairs of red sensors, of which there are 5 pairs of infrared sensors for the anti-pinch sensing area, the photoelectric sensors sense the presence of objects in the sensing area, the door wings will stop moving. Prevent the occurrence of pinching events.

4. Door closing delay
When the pedestrian swipe card does not immediately pass, the door wing to maintain the open state may occur non-authorized personnel infiltration event, in order to prevent the occurrence of this event. By setting the door opening delay function for the speedy door, the default delay time is set to 8 seconds. And then with the photoelectric sensor induction function to detect whether there is a person within 8 seconds of the swipe card open door. If no one passes through it will automatically close, the delay time can be modified according to needs.

I hope the above information can help you understand the function of photoelectric sensor in the pedestrian access gate. If you want to know more about the application of infrared photoelectric sensors, you can also contact us by email. g-TEK has 20 years of experience in the infrared photoelectric sensor industry and insists on providing the most suitable and reliable photoelectric sensor solutions for our customers.