Cognex DS900 Series, Reference Information

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Maximum Scan Rates for Measuring Fields
Maximum Acquiring Rate Depending on the Measuring Field Number
+0 +1 +2 +3 +4 +5 +6 +7
0 144Hz 192Hz 192Hz 192Hz 284Hz 284Hz 284Hz 552Hz
8 181Hz 239Hz 239Hz 239Hz 354Hz 354Hz 354Hz 680Hz
16 181Hz 239Hz 239Hz 239Hz 354Hz 354Hz 354Hz 680Hz
24 181Hz 239Hz 239Hz 239Hz 354Hz 354Hz 354Hz 680Hz
32 241Hz 318Hz 318Hz 318Hz 469Hz 469Hz 469Hz 892Hz
40 241Hz 318Hz 318Hz 318Hz 469Hz 469Hz 469Hz 892Hz
48 241Hz 318Hz 318Hz 318Hz 469Hz 469Hz 469Hz 892Hz
56 241Hz 318Hz 318Hz 318Hz 469Hz 469Hz 469Hz 892Hz
64 362Hz 476Hz 476Hz 476Hz 694Hz 694Hz 694Hz 1200Hz
72 362Hz 476Hz 476Hz 476Hz 694Hz 694Hz 694Hz 1200Hz
80 362Hz 476Hz 476Hz 476Hz 694Hz 694Hz 694Hz 1200Hz
88 362Hz 476Hz 476Hz 476Hz 694Hz 694Hz 694Hz 1200Hz
96 552Hz 552Hz 1030Hz 1030Hz 1030Hz 1030Hz 1030Hz 1030Hz
104 680Hz 680Hz 1200Hz 1200Hz 1200Hz 1200Hz 1200Hz 1200Hz
112 892Hz 892Hz 1200Hz 1200Hz 1200Hz 1200Hz 1200Hz 1200Hz
120 1200Hz 1200Hz 1200Hz 1200Hz 1200Hz 1200Hz 1200Hz 1200Hz
Recommended Shutter Times
The value of exposure (in milliseconds) should be set depending on the material that is being scanned. The
recommendations are as follows:
Recommended shutter times (approximate values)
Target material Shutter Time
White paper/plastic 10 - 50μs
Colored plastic 50 - 100μs
Metallic surfaces 0.1 - 1ms
Black plastic/rubber 0.5 - 1ms
The measuring field can be restricted by omitting complete matrix areas in order to suppress interfering image ranges.
Measuring field and measuring range must be clearly differentiated in practical use. The measuring field is related to
the matrix and the measuring range is related to the measuring object (the object space). Both do not have to match on
account of the optical mapping and the definitions. The measuring field “standard” is larger than the measuring range
“standard”.
The DS900 Series Sensors are distinguished by:
l
A laser line with 20° opening angle (measuring range 25 mm) respectively 25° opening angle (measuring ranges
50 mm and 100 mm).
l
The receiver has a smaller opening angle (view angle) than the laser line.
l
Centered measuring field (symmetrical to the center axis).
l
The high resolution sensor image matrix has 1280 x 1024 pixels. The measuring field geometry is fixed.
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Measuring Field Selection