Apogee Instruments SQ-100X Series Manuale d'uso - Pagina 13

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Sensor Calibration

All Apogee unamplified quantum sensor model (SQ-100X) 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 (10.0 µmol m

10.0

Full Sunlight

(2000 µmol m

-2

10.0 µmol m

-2

-1

per mV) * Sensor Output Signal (mV) = PPFD (µmol m

-1

)

Sensor Output

200 mV

-2

-1

per mV

200

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

output signal of 200 mV. The signal is

converted to PPFD by multiplying by the

calibration factor of 10.00 µmol m

-2

-1

-2

-1

)

2000

-2

-1

. This yields an

-2

-1

per mV.