Campbell SkyVUE 8, Product Manual

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2.2 Optical measurement
FIGURE 2-1. Principle of operation
2.2.1 Optical arrangement
The SkyVUE 8 uses a single biaxial lens design that increases optical signal-to-noise ratio, while
maintaining Class 1M eye safety by integrating larger optics into a compact package (see
FIGURE
2-1 (p. 8)). Half of the lens is used by the transmitter, and the other half is used by the receiver.
This design provides an alternative to traditional two lens or common-optics designs. The optical
isolation of traditional biaxial systems is maintained to increase detector sensitivity, while the low
overlap onset height of common-optics systems is incorporated to allow measurements at close
ranges.
2.3 Internal monitoring
The SkyVUE 8 monitors window contamination, key voltages and currents, internal temperature
and relative humidity, and other parameters relevant to its performance. Data messages (see
Operation (p. 25)) include this information allowing remote diagnosis of the SkyVUE 8 condition.
In addition, a special status message can be polled.
SkyVUE™8 (CS136) LIDAR Ceilometer 8