-5-
A multi-channel
EXACTUS
®
system
:
Figure 2B: Multi-Channel
System provides Ethernet communication to a PC along
with up to eight analog outputs and two latching relays.
2.1 Collection Optics
There are two basic types of collection optics:
lightpipes and lenses
. The advantage of the
lightpipe is its small diameter, which only requires a small access hole into the process being
measured, and its ability to collect light from a wide range of angles, which can help decrease
emissivity or roughness errors. Lens systems allow the user to view a small collection spot
on a hot object from greater distances and they can be used to look through a window or view
port when direct access to the hot object is not available. Lightpipes are more efficient at
collecting light than lens systems, therefore they are better suited for low temperature
measurements. BASF manufactures custom collection optics for specific user needs and
measurement applications. Lightpipes and lenses can be coupled directly to the measurement
electronics or coupled via fiber optic transmission cables.
