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About Displacement Sensors |
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Overview
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| 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. |
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Comparison by detection method
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| 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
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Short |
Normal |
Long |
Short |
Short |
Accuracy
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High |
High |
Low |
High |
High |
Response speed
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Fast |
Fast |
Slow |
Normal |
Slow |
Environmental
resistance
|
Highly durable |
Normal |
Normal |
Normal |
Highly durable |
Detecting
point
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Normal |
Small |
Large |
Small |
Small |
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Classification of Displacement Sensors
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Detection method
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Eddy current type
|
Optical type
(Triangulation)
Light source:
semiconductor laser |
Ultrasonic wave type |
Contact type |
| Features |
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High resolution, high accuracy. |
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The sensor head is small. |
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Excellent environmental resistance. |
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Measures all types of materials. |
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Small area can be
measured
from a distance. |
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Measures
transparent objects. |
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Change of color does not affect the measurement. |
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Measures transparent (solid) objects with high accuracy. |
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The measurement point
is small. |
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Multi-purpose,
long range. |
| Exterior |
Sensor head
 |
 |
- |
- |
Controller
(amplifier
unit) |
 |
 |
 |
- |
- |
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 |
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| Detection method |
Optical type
(two-dimensional scanning, triangulation)
|
Optical type
(electro-optical distance measuring type) |
Optical type
(laser focus type) |
| Features |
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Instantaneously measures width and height. |
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Measures the shape of cross section. |
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Long distance/range. |
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Small spot. |
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Measures all types of materials. |
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Not affected by the surface conditions. |
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Measures film thickness of a transparent object. |
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| Exterior |
Sensor head |
 |
 |
 |
Controller
(amplifier unit) |
 |
 |
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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)
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Between 0.18 and 1.22in |
| Sampling cycle |
30ms |
40ms |
640μs |
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