Basic Knowledge of Displacement Sensors

Types of Laser Displacement Sensors

Optical Systems of Displacement Sensors

Diffuse Reflective

The laser beam is emitted to a target object at right angle.
The receiver element detects reflected light from the object.
Measurement in a longer distance range can be made with this system.
This is not suitable for measurement against a transparent or specular object that rarely produces diffuse reflection.

Specular Reflective

The optical system is installed at the same light axis angle of emittance and receipt, and mainly used for measurement of transparent and specular objects.
The measurement distance becomes shorter, however, higher measurement accuracy can be obtained.

  • Diffuse Reflective Diagram
  • Specular Reflective Diagram

Through-beam

This sensor emits light of screen beam to measure blocked light width by an object.
The through-beam system avoids influence from color and surface conditions of an object and is suitable to measure a width, diameter and gap.

  • Through-beam Diagram
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