4
Terminology
Emitter
The emitter consists of emitter units; it can emit the modulated light signal.
Sensor
The sensor consists of emitter units and (or) receiver units. It can emit and (or) accept the modulated
light and form light curtain with a reflector (or through reflector/mirror). Output a light passing signal
or light intercepting signal to controller. In order to be advantageous for the description, sometimes
also refers to the emitter and (or) the receiver.
Reflector
The reflector used to reflect the modulated light from emitter units to receiver units.
Mirror
The mirror used to change the light direction of transmission from emitter units to receiver units, to
form multi-sides protection light curtain.
Signal cable
The signal cable used to connect the emitter, receiver and the controller, or connect the sensor and
controller.
Light curtain device
All the components that the sensor and the reflector of the reflection type, the emitter and the
receiver of the direct protection type and the reflector, the emitter and the receiver of the multi-sides
protection type, produce the light curtain.
Light beam
The emitter unit sends out the infrared light, forms a bunch of parallel light after passing optics part.
Beam center line
It is the middle line of the light beam.
Light axis pitch
The distance of optical axis between the neighboring two bunches of light, uses to express the light
beam density of light curtain, the optical axis spacing is smaller, and the light beam is more crowded.
Detection precision
The light curtains' ability to detect the size of test piece, it means when the light curtain is shaded
anywhere, active opto-electronic protective device can have induction function and when the device
keeps off state, it needs the diameter value of the smallest test piece.
Protective range
The protector can protect length scope.
Light beam number
It is quantity of the light beams that sending out from emitter, the same as the quantity of the emitter
units in the emitter.
Light passing
It is the output state of the protector when the light curtain is not intercepted.
Light intercepting
It is the output state of the protector when the light curtain is intercepted.
2 Basic Introduction
2.1
