FAQ No. FAQ01465
Question
What is resolution?
Answer
The resolution is the width of the linear output
variation when both the sensing object and Sensor are stationary. Even if
both the sensing object and Sensor are stationary, the linear output value
is not stable. It varies, and the width of this variation is the
resolution.
The resolution is the ability to distinguish differences. It is used as
the basis for judgments, but only a 10th of the required resolution is
normally used. For example, if a resolution of 20 μm is required for a
judgment, a Sensor with resolution capability of 2 μm should be used.
Caution:
The resolution does not represent the accuracy of the distance. It
indicates reproducibility when positioning a sensing object. The
resolution is defined for OMRON's standard sensing object (white ceramic),
and depends on the type of sensing object.
・The Smart Sensor has a resolution display function for easy confirmation
of the resolution of the sensing object.
・The resolution and response speed are mutually related. When the response
speed is decreased, the resolution improves. Generally, when the averaging
number is multiplied by a factor n, the resolution improves by the square
root of n.
The response speed of the Smart Sensor and the averaging number can be set
to any of 13 different levels, as shown below. The relationship between
the averaging number and the response time is shown in the following
table.
Relationship of Averaging Number and Response
Time (with a Fixed Gain)
|
Averaging number |
Response time (ms) |
|
1 |
0.3 |
|
2 |
0.5 |
|
4 |
0.8 |
|
8 |
1.5 |
|
16 |
2.5 |
|
32 |
5 |
|
64 |
10 |
|
128 |
20 |
|
256 |
40 |
|
512 |
75 |
|
1024 |
150 |
|
2048 |
300 |
|
4096 |
600 |
Other Displacement Sensor FAQs
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