Working Principle of a Measuring Light Curtain
A measuring light curtain operates based on an infrared or laser beam obstruction detection mechanism, enabling precise, non-contact measurement of object size and position. Its core components are a transmitter, a receiver, and a controller.
Key Operating Steps:
Beam Transmission: The transmitter generates a dense array of infrared or laser beams, forming a “light curtain” that covers the detection area. The smaller the beam spacing, the higher the measurement accuracy (up to 1mm).
Object Obstruction: When an object passes through the light curtain, part of the beam is obstructed, causing light interruption or attenuation. The receiver is precisely aligned with the transmitter to capture changes in the beam state in real time.
Signal Conversion: The receiver’s photoelectric sensor converts the optical signal into an electrical signal, identifying the number and location of obstructed beams. The controller processes these signals to calculate the object’s dimensions (e.g., length, width), shape, or volume.
Result Output: The system outputs measurement data via digital or analog signals (e.g., RS485), compatible with automated control systems.
This principle enables high-speed response (as low as 3ms), avoids physical contact and damage to objects, and is suitable for dynamic applications such as precision manufacturing and logistics sorting.
Note:
Transparent objects require special handling, as infrared light may not be effectively detected.
Beam modulation technology reduces ambient light interference, ensuring accurate detection.
