Banner PresencePLUS Megapixel C-Mount Lenses - Manual (Page 5)

Lens Selection Guide
2
P/N 69950 rev. B
Banner Engineering Corp. • Minneapolis, MN • USA
www.bannerengineering.com • Tel: 763.544.3164
Determining Field of View
To determine FOV size: Measure the size of the inspection area (inches or millimeters), and
allow extra area to accommodate any anticipated movement of the target object.
To verify that the FOV is sufficient for the required resolution:
1. Estimate the required resolution or minimum detection size; for example, will the inspection
measure to a tolerance of 0.1 mm? 1 inch? 10 feet?
2. Use the FOV Formula below to determine the maximum horizontal and vertical FOV that will
maintain the required resolution.
3. Verify that the calculated FOV is larger than the inspection area.
FOV Formula
Required Resolution x 640 pixels = Maximum Horizontal FOV
Required Resolution x 480 pixels = Maximum Vertical FOV
Calculated FOV Example
Approximate area of inspection is 3.0" by 3.5". Required resolution is 0.01".
For the required resolution, is the area of inspection an acceptable FOV?
Required Resolution x 640 pixels = Maximum Horizontal FOV.
0.01" x 640 = 6.4" Maximum Horizontal FOV.
Required Resolution x 480 pixels = Maximum Vertical FOV.
0.01" x 480 = 4.8" Maximum Vertical FOV.
The Calculated FOV (6.4" x 4.8") is larger than the area of inspection;
therefore, a 3.0" x 3.5" FOV is acceptable.
If the calculated FOV is smaller than the desired area of inspection, options are as follows:
• Use multiple cameras.
• Inspect a smaller portion of the area.
• Reduce the resolution requirement.