Apogee S2-442 Panduan Pemilik - Halaman 12
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Sensor Calibration
The Apogee unamplified PAR-FAR sensor model S2-141 has approximate calibration factors of:
Multiply the calibration factors by the measured voltages to convert sensor outputs to PPFD and far-red photon
flux density (PFD) in units of mol m
PAR Calibration Factor (100 mol m
100
Far-red Calibration Factor (50 mol m
50
Full Sunlight
(2000 mol m
-2
100 mol m
50 mol m
-2
-1
s
:
-2
s
*
-2
-1
s
per mV) * Sensor Output (mV) = Far-red PFD (mol m
*
s
-1
)
Sensor Output
20 mV
-2
-1
s
per mV for PAR
-2
-1
s
per mV for Far-red
-1
per mV) * Sensor Output (mV) = PPFD (mol m
20
8
Example of PPFD measurement with an Apogee
S2-141 PAR-FAR sensor. Full sunlight yields
PPFD on a horizontal plane at the Earth's
surface of approximately 2000 mol m
This yields an output signal of 20 mV from the
PAR sensor. The signal is converted to PPFD by
multiplying by the calibration factor of 100
mol m
-2
-1
s
per mV. Conversion of the signal
from the far-red detector is converted to far-
red photon flux density the same way, but
using the far-red sensor calibration factor.
-2
-1
s
)
=
2000
-2
=
400
-2
-1
s
.
-1
s
)