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Detection Method
Detection Method Features
The features of the different detection methods are shown below.
◎: Excellent ○: Normal △: Poor
Type General description
Features
Detection
stability
Long
range
detection
Installation
workload
Through-
beam
With this type, detection is performed by installing two fiber
units so that one emits and one receives light.
◎ Not affected by the color, tilt, or uneven surfaces of the
object
◎ Capable of long-distance detection
△ Necessary to install fiber units in two locations to emit and
receive light
◎ ◎ △
Diffuse
reflective
With this type, there is no need to install items such as a
fiber unit or a reflector behind the object.
◎ Only requires installation in one location, reducing the
workload
○ Small object detection possible with fiber unit types on
which optional lenses can be installed on the tips
△ Easily affected by the color, tilt, or uneven surfaces of the
object
△ △ ◎
Limited
diffuse
reflective
This type is the same as the diffuse reflective type, in that
there is no need to install items such as a fiber unit or a
reflector behind the object.
◎ Effect of the background is minimal because detection
can be performed with a limit on the distance
○ More resistant to the effects of object color and tilt than
the diffuse reflective type
△ Shortest sensing distance
○ △ ◎
Retro-
reflective
With this type, detection is performed by installing a fiber
unit and a reflector so that the light reflects off of the
reflector.
◎ Not affected by the color, tilt, or uneven surfaces of the
object
○ Suited to detection of transparent objects
△ Large installation space required for reflector
◎ ○ △
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