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Your guide to Photoelectric Sensors
Laser Sensors
Features
Detection configuration
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Laser Sensors
  

Laser Sensors/Features/Detection configuration

Outline
A laser sensor emits a beam of light from its transmitter. A reflective type photoelectric sensor is used to detect the light beam reflected from the target and the thrubeam type is used to measure the change in light quantity caused by the target crossing the beam.
Photoelectric sensor types.

Features
Non-contact detection
Non-contact detection eliminates damage either to the target or sensor head, ensuring long service life and maintenance-free operation.
Detection of targets of virtually any material
Detection is based on the quantity of light received, or the change in the quantity of reflected light. This method allows detection of targets of diverse materials.
Long-detecting distance
Some laser sensors have a detecting distance of up to 1 m (3.3'), and some thrubeam types have a detecting distance up to 2 m (6.6').
High response speed
The laser sensor is capable of a response speed as high as 80 µs.
Highly accurate detection
A unique optical system and a precision electronic circuit allows highly accurate positioning and detection of minute objects.

Detection configuration and features
Type Detection configuration Features Model
(KEYENCE products)
Thrubeam Thrubeam sensor configuration Detection occurs when the target crosses the beam between transmitter and receiver.
Long-detecting distance
Stable detection
Opaque objects are detectable regardless of shape, color or material
Powerful beam
LV,LX2,PZ-M,PZ2,PS,PW,PJ,PQ and FS,FS2 units
Retro-reflective Retro-reflective sensor configuration Detection occurs when the target crosses the beam between sensor head and reflector.
Reflector allows for installation in a limited space
Simple wiring
Easily-adjustable optical axis
Opaque objects are detectable regardless of shape, color, or material
PZ-M,PZ2,PW and LV,FS units
Focused-beam reflective Focused-beam reflective sensor configuration Detection occurs when the beam spot is reflected by the target and received by the sensor.
Minute objects detectable
Target markings detectable
Detection throuth narrow slits
Visible beam spot
LV and FS,FS2 units
Small-spot definite reflective Small-spot definite reflective sensor configuration 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 minimal
Low hysteresis
Slight height differences detectable
PS, and FS,FS2,LV units
(Internal lens units)

More on this topic...
-> A Desktop Reference for Sensors, Vision Systems and Measuring Instruments. General Catalog
-> Digital Laser Sensor Application Guide Digital Laser Sensor Application Guide
Best Sensor Guide: Laser Edition Best Sensor Guide: Laser Edition
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