Detection based on “light”
Detection method and feature of photoelectric sensors

Classification

Thrubeam

Thrubeam

Detection occurs when the target crosses the optical axis between transmitter and receiver.

  • ・Long-detecting distance
  • ・Stable detecting position
  • ・Opaque objects detectable regardless of shape, colour or material
  • ・Powerful beam

Retroreflective

Retroreflective

Detection occurs when the target crosses the optical axis between sensor head and reflector.

  • ・Reflector allows installation in a limited space
  • ・Simple wiring
  • ・Longer detecting distance than the diffuse-reflective sensor type
  • ・Easily-adjustable optical axis
  • ・Opaque objects detectable regardless of shape, colour, or material

Diffusereflective

Diffusereflective

Detection occurs when the light beam, emitted to the target, is reflected by the target and received.

  • ・Space-saving (requires installation of sensor unit only)
  • ・Adjustment of optical axis not required
  • ・Reflective transparent objects detectable
  • ・Colour differentiation possible

Focusedbeam reflective

Focusedbeam reflective

Detection occurs when the beam spot, emitted to the target, is reflected by the target and received.

  • ・Minute objects detectable
  • ・Target markings detectable
  • ・Detection possible through narrow openings between machines
  • ・Visible beam spot

Small-spot definite reflective

Small-spot definite reflective

The transmitting and receiving portions are constructed at an angle, allowing detection within the limited area where the optical axes intersect.

  • ・Effect of target background is minimal
  • ・Low hysteresis
  • ・Slight height differences are detectable
  • ・Visible beam spot

Fixeddistance

Fixeddistance

Detects the target at a specific distance according to the angle of the reflected light beam.

  • ・Unaffected by highly reflective targets or backgrounds
  • ・Stable detection of materials with varying reflectance and colour
  • ・Highly accurate detection of minute objects
  • ・Visible beam spot

Lustre recognition

Lustre recognition

When the light beam hits a target, the beam reflects differently according to the Lustre of the target. The sensor detects the difference in Lustre based on how the beam reflects (specular or diffusive).

  • ・On-line detection is possible.
  • ・Detection is not affected by target colour.
  • ・Transparent targets can be detected.

INDEX

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