Dynavision B Series, Руководство пользователя, Страница: 17 / 29

17
5.2.2 Chain Spacing
Any chains that run between B800 sensors (2 foot centers) must have chain guides as
narrow as possible. This may be achieved by eliminating the side rails at the point that
the laser would strike it and let the chain only travel on the bottom center guide. It is
mandatory to keep each sensor’s field-of-view unobstructed and to prevent lasers from
hitting the chain.
The illustration below shows a B800 sensor mounted on the bottom of a frame with the
chain run through it’s field of view. This is an example of improper chain spacing. In this
case lasers 3 and 5 are not visible to Camera 1 and laser 4 is hitting the chain. No
range data will be reported for lasers 3 and 5 in this example because they are not seen
by both cameras.
Important! Both cameras must have a clear view of each laser in order to provide
range information.
The highly reflective surface and constant movement of the chain hit by laser 4 will
interfere with the sensor’s ability to give accurate range data at that point. It will also
cause the sensor to give range data while no board is present in the scanner.
Figure 5.4 - Improper Chain Spacing
One of the Camera’s Field
of View