Apogee SQ-202X Instrukcja obsługi - Strona 12
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Sensor Calibration
Amplified quantum sensor models have a standard PPFD calibration factor of exactly:
Multiply this calibration factor by the measured mV signal to convert sensor output to PPFD in units of µmol m
Calibration Factor (0.8 µmol m
0.8
Full Sunlight
-2
-1
(2000 µmol m
s
)
SQ-202X: 1.6 µmol m
SQ-205X: 0.8 µmol m
-2
-1
s
per mV) * Sensor Output Signal (mV) = PPFD (µmol m
*
Example of PPFD measurement with an Apogee quantum sensor. Full
sunlight yields a PPFD on a horizontal plane at the Earth's surface of
approximately 2000 µmol m
for the 0-5 V option or an output signal of 1250 mV for the 0-2.5 V
option. The signal is converted to PPFD by multiplying by the calibration
factor.
Sensor Output: 4 V
Sensor Output: 2.5 V
SQ-215/225
SQ-205X
Conversion Factor: 0.5 µmol m
Conversion Factor: 0.8 µmol m
Sensor Output: 2 V
Sensor Output: 1.25 V
SQ-212-222
SQ-202X
Conversion Factor: 1.0 µmol m
Conversion Factor: 1.6 µmol m
-2
-1
s
per mV
-2
-1
s
per mV
2500
=
-2
-1
s
. This yields an output signal of 2500 mV
-2
-2
-1
-1
s
per mV
s
per mV
-2
-1
-2
s
-1
per mV
s
per mV
-2
-1
s
:
-2
-1
s
)
2000