Apogee S2-131-SS Gebruikershandleiding - Pagina 11
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Sensor Calibration
The Apogee unamplified red - far-red sensor model S2-131 has approximate calibration factors of for the red and
far-red sensors:
Multiply the calibration factors by the measured voltages to convert sensor outputs to red and far-red photon flux
densities (PFD) in units of mol m
Calibration Factor (12 mol m
Calibration Factor (12 mol m
Full Sunlight
(150 mol m
-2
-1
s
12 mol m
-2
-1
s
:
-2
-1
s
per mV) * Sensor Output Signal (mV) = Red PFD (mol m
12
-2
-1
s
per mV) * Sensor Output Signal (mV) = Far-Red PFD (mol m
12
)
Sensor Output
12.5 mV
-2
-1
s
per mV
*
12.5
*
11.3
Example of red photon flux density (PFD)
measurement with an Apogee red - far-red
sensor. Full sunlight yields a red PFD on a
horizontal plane at the Earth's surface of
approximately 150 mol m
output signal of 12.5 mV. The signal is
converted to red PFD by multiplying by the
calibration factor of 12 mol m
-2
-1
s
)
=
150
-2
-1
s
)
=
136
-2
-1
s
. This yields an
-2
-1
s
per mV.