National Instruments ISC-1772, User Manual

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Chapter 5 Image Sensor
NI 177x Smart Camera User Manual 5-2 ni.com
To calculate the horizontal and vertical field of view (FOV) of your imaging
system, use Equation 5-1 and the specifications for the image sensor of
your device, as listed in Appendix A,
Specifications .
(5-1)
where FOV is the field of view in either the horizontal or vertical
direction,
Pixel Pitch measures the distance between the centers of adjacent
pixels in either the horizontal or vertical direction
1
,
Active Pixels is the number of pixels in either the horizontal or
vertical direction,
Working Distance is the distance from the front element (external
glass) of the lens to the object under inspection, and
Focal Length measures how strongly a lens converges (focuses)
or diverges (diffuses) light.
Figure 5-1 illustrates horizontal field of view and working distance.
Figure 5-1. Parameters of an Imaging System
1
Because NI 177x Smart Camera sensors have square pixels, pixel pitch corresponds to the pixel size for the appropriate sensor.
1 Horizontal Imaging Width
2 Working Distance
3 Horizontal Field of View
FOV
Pixel Pitch Active Pixels × Working Distance ×
Focal Length
----------------------------------------------------------------------------------------------------------------- =
2
1
3