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42
P/N 120413
01/05
Setup
PresencePLUS
®
P4 EDGE
Banner Engineering Corp.
• Minneapolis, MN USA
www.bannerengineering.com • Tel: 763.544.3164
Exposure Time Considerations
Consider the following when setting the exposure time:
•
Exposure time affects how much light is needed to illuminate the part.
•
Exposure time affects how fast a part can pass by the Sensor as its image is captured:
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Short exposure times require bright light sources.
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Bright light sources are less efficient and can have a shorter useful life.
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Long exposure times can blur the images of fast-moving objects. An image is blurred if the part moves a distance greater
than one picture element (pixel) of the image during the exposure time.
o
Use the following calculation to determine the maximum exposure time without blurring:
Horizontal Field of View (FOV) is the width of the image in inches.
Part speed is the speed of the production line in inches per second.
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To convert part speed in feet per minute to inches per second, multiply by 0.2.
Exposure Time Example:
A part is moving along the conveyor at 25 feet per minute. What is the maximum exposure time?
25 feet per minute x 0.2 = 5" per second.
Therefore:
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Place a ruler in the FOV at the working distance, and observe the measurement of the FOV
width in the Image window. Assume for this example that the FOV width is 5".
Horizontal FOV
x 1000
Max. Exposure Time (ms) =
Part Speed x 128
TIP
5"
5" per second x 128
x 1000 = 7.81 ms
Max. Exposure Time =
Содержание PresencePlus P4
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