The measuring light curtain is a kind of light curtain with high precision and higher technical requirements derived from the safety light curtain. A single set or multiple sets of sensors are used to measure and transmit signals.
The light curtain is divided into two uses, one is a safety light curtain, and the other is a measurement light curtain. Safety light curtains are mainly used for industrial safety protection, and measuring light curtains are suitable for testing whether products comply with regulations.
The photoelectric sensor is an electronic device that senses the change of the light intensity it receives, including an optical system, an amplifier and a switch output device. All photoelectric sensors use modulated light to eliminate the possible influence of the surrounding light source. When working, the photoelectric sensor emits light. When the detected object passes by, depending on the detection mode, the object either absorbs light or reflects the light to the photoelectric sensor. In this way, the intensity of the light received by the receiver changes, and the change value triggers the switch signal output to realize the detection function.
Light curtain measurement principle
The measuring light curtain is a special photoelectric sensor. Like the ordinary through-beam photoelectric sensor, it contains two parts: a transmitter and a receiver, which are separated and placed opposite each other, but with a large external size and a long tube. The detection light generated by the measuring light curtain transmitter is not only one beam like an ordinary sensor, but a light array is generated at a fixed interval along the length direction to form a "light curtain", which is scanned in a way with the controller and its software. Realize the function of monitoring and measuring the dimensions of objects.
The light curtain measurement system needs to be equipped with a controller to work normally. The controller uses software for programming settings. It can provide multiple scan modes and detection and analysis modes, and it can communicate with PLC or computer through a serial interface to transfer control or scan As a result, a trigger signal can also be connected to control the scanning process.
