Campbell Scientific NR01 Net Radiometer - Manual (Page 5)

NR01 Four-Component Net Radiation
Sensor
The NR01 is a four-component net radiation sensor that is used for scientific-grade energy
balance studies.
1. Introduction
The NR01 has separate measurements of solar (Short Wave or SW) and Far
Infra-Red (Long Wave or LW) radiation. It offers a professional solution to
the measurement of net radiation and its four main components. The NR01 is
robust and requires only limited maintenance.
Measurement of the separate components of the net radiation is useful because
it:
• Enhances accuracy by having separately calibrated instruments (similar
accuracy cannot be attained with sensors with single outputs or dual
outputs). Single-output or dual-output instruments will always suffer from
instrument asymmetry or from errors due to sensitivity differences for LW
and SW radiation.
• Provides more detailed information than sensors with single or dual
outputs (e.g., albedo of the ground, cloud condition).
• Allows more thorough quality assurance of the instrument data (compared
to sensors with single or dual outputs). Quality assurance with four-
component radiometers is done by analyzing trends in SW
in
absolute
signal, SW albedo, correlation of SW
in
and LW
in
, SW night time signals,
and correlation LW
out
and surface temperature.
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