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Your guide to Displacement Sensors
Guide Topics
Displacement Sensors
Displacement Sensors
Semiconductor laser displacement sensors and meters
Inductive (eddy current) displacement
CCD Laser Displacement Sensor (LK Series)
Measurement Principle of Double Scanning Method
Measurement Principle of Laser Confocal Microscope
Optical Micrometers
Hints on Correct Use
Glossary
KEYENCE General Catalog

Keyence Product Information Site
KEYENCE Displacement Sensor Product information

Technical Glossary

World Standards Information
Product Catalogs
Laser Displacement Sensor
LK-G High-speed, High-accuracy CCD Laser Displacement Sensor
LK Series Ultra-accuracy CCD Laser Sensor
LC3 Ultra-high Accuracy Laser Sensor
LT-9000 High-accuracy Confocal Laser Displacement Meter
RD Analog Sensor Controllers
LT Series Confocal Laser Meter
LK-3100 Ultra-Compact CCD Laser Sensor
LB-1000 High Accuracy Laser Sensor
Inductive Displacement Sensor
EX-V Digital, High Speed/Accuracy Sensor
EX-500 High Accuracy Sensor
EX-200 High-speed Response Sensor
Optical Micrometer
LS-7000 High Speed LED/CCD Optical Micrometer
LS-5000 Laser Scan Micrometer
LX2-V Laser Thrubeam Photoelectric Sensor
Information Downloads
Increasing Measurement Range
Electronics & Electronic Component Industry Guide
Semiconductor/FPD/Food/
Pharmaceutical Industry Guide
Ultra-Long Range Laser Displacement Sensor
Rubber/Plastic/Film/Metal Industry Guide
Displacement Sensors
  

Displacement Sensors

Overview
Displacement sensors measure the distance an object moves and they can also be used to measure object height and width. There are 2 types of displacement sensors: Contact types, utilizing a dial gage, differential transformer, etc., and non-contact types, utilizing a magnetic field, laser beam, ultra-sonic wave, etc. This section focuses on non-contact sensors capable of fast response measurement.
Comparison by detection method
Type Eddy current type Optical type Ultrasonic wave type Laser
focus type		 Contact type
Detectable object Metal Most objects Most objects

Most objects

Solids
Detecting distance
 Short Normal Long Short Short
Accuracy
 High High Low High High
Response speed
 Fast Fast Slow Normal Slow
Environmental
resistance
 Highly durable Normal Normal Normal Highly durable
Detecting
point
 Normal Small Large Small Small

Classification of Displacement Sensors
Detection method
 Eddy current type
 Optical type
(Triangulation)
Light source:
semiconductor laser		 Ultrasonic wave type Contact type
Features
High resolution, high accuracy.
The sensor head is small.
Excellent environmental resistance.
Measures all types of materials.
Small area can be
measured
from a distance.
Measures
transparent objects.
Change of color does not affect the measurement.
Measures transparent (solid) objects with high accuracy.
The measurement point
is small.
Multi-purpose,
long range.
Exterior Sensor head Eddy current sensor Optical triangulation sensor - -
Controller
(amplifier
unit)		 Controller Controller Controller - -
Model type
(Keyence)		 EX series AS series LK-G, LK, LC
LB series		 - -
Item
 Object Metal Metal Solids, liquids Solids, liquids Solids
Resolution 0.3μm 1μm 0.01μm 0.1mm 0.16μm
Measuring range Between 0 and
10mm		 Between 0 and
10mm		 Between 9 and 750mm Between 60mm and
10m		 Between 1 and
10mm
Response frequency Maximum 18kHz Maximum 3.3kHz Maximum 8.3kHz Maximum 20Hz Maximum 40Hz
Detection method Optical type
(two-dimensional scanning, triangulation)
 Optical type
(electro-optical distance measuring type)		 Optical type
(laser focus type)
Features
Instantaneously measures width and height.
Measures the shape of cross section.
Long distance/range.
Small spot.
Measures all types of materials.
Not affected by the surface conditions.
Measures film thickness of a transparent object.
Exterior Sensor head 2 dimensional scanning sensor Electro-optical sensor Laser focus sensor
Controller
(amplifier unit)		 Controller Controller Controller
Model type
(Keyence)		 LF series LF series LT series
Item

 Object Solids
(opaque)		 Solids, liquids
(opaque)		 Solids, liquids
(opaque/transparent)
Resolution Z direction （10μm）
X direction （30μm）		 0.5mm 0.01μm
Measuring range Z direction (80 + 15mm)
X direction (30/40mm) 		Displacement mode
(400mm) /
stoke mode
(15m)
Between 0.18 and 1.22in
Sampling cycle 30ms 40ms 640μs

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Laser measurement of any material or surface.
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