Light curtain manufacturers, one side of the light curtain is installed with multiple infrared emission tubes at equal intervals, and the other side has the same number of infrared receiving tubes in the same arrangement. Each infrared emission tube corresponds to a corresponding infrared receiving tube, and the installation on the same straight line. For light curtain manufacturers, when there is no obstacle between the infrared transmitting tube and the infrared receiving tube on the same line, the modulation signal (optical signal) sent by the infrared transmitting tube can reach the infrared receiving tube smoothly. After the infrared receiving tube receives the modulation signal, the corresponding internal circuit outputs a low level, and in the case of obstacles, the modulation signal (optical signal) sent by the infrared transmitting tube cannot reach the infrared receiving tube smoothly. At this time, the infrared receiving tube The tube can not receive the modulation signal, and the corresponding internal circuit output is high level. For light curtain manufacturers, when there is no object passing through the light curtain, the modulation signals (light signals) sent by all infrared emission tubes can smoothly reach the corresponding infrared receiving tubes on the other side, so that all internal circuits output low level. In this way, information on the presence or absence of an object can be detected by analyzing the state of the internal circuit.

According to light curtain manufacturers, the number of infrared emission and reception channels of safety light curtains can theoretically be infinite.

The safety light curtain is divided into linear scanning mode and cross-scanning mode. In the linear scanning mode, the single-chip microcomputer sends the same channel selection signal to the sending end and the receiving end each time, that is, the first channel sends the first channel to receive, and the second channel sends the second channel. The road is received, the fifteenth road is sent to the fifteenth road, and the sixteenth road is sent to the sixteenth road. In the cross-scan mode, the single-chip microcomputer sends a different channel selection signal to the transmitter and receiver each time. That is, the first route is sent to the second route, the second route is routed to the first route, the fifteenth route is routed to the sixteenth route, and the sixteenth route is routed to the fifteenth route. For light curtain manufacturers, in contrast, the cross-scanning mode measures the height of the object more accurately, and the detection accuracy is the highest at the center 1/3 of the detection area. The minimum detection height can be reduced to 2/3 of the linear scanning mode. However, considering the actual needs, safety light curtains with linear scanning methods are now commonly used. Light curtain manufacturer.