ADNS-2610 View Datasheet(PDF) - Agilent Technologies, Inc
Part Name
Description
MFG CO.
'ADNS-2610' PDF : 27 Pages View PDF
SQUAL
Access: Read
Address: 0x04
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
SQ7
SQ6
SQ5
SQ4
SQ3
SQ2
SQ1
SQ0
Data Type: Upper 8 bits of a 9-bit integer.
USAGE: SQUAL (Surface QUALity) is a measure of the number of features visible by the sensor in the current frame.
Number of Features = SQUAL Register Value x 2.
The maximum value is 255. Since small changes in the current frame can result in changes in SQUAL, variations in SQUAL when looking at a
surface are expected. The graph below shows 250 sequentially acquired SQUAL values, while a sensor was moved slowly over white paper.
SQUAL is nearly equal to zero when there is no surface below the sensor.
SQUAL Values (White Paper)
256
192
128
64
0
1
26
51
76
101
126
151
176
201
226
251
1.50
X + 3σ
1.25
X
X – 3σ
1.00
0.75
0.50
0.25
0
-1.0 -0.6 -0.2 0.2 0.6 1.0
DELTA FROM NOMINAL FOCUS (mm)
Figure 32. Typical Mean SQUAL vs. z
(white paper).
The focus point is important and
could affect the SQUAL value.
Figure 32 shows another setup
with various z-heights. This
graph clearly shows that the
SQUAL value is dependent on
focus distance.
Note: The data is obtained by
getting multiple readings over
different heights.
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