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Sensor Calibration

Apogee SQ-644 Quantum Light Pollution Sensors have standard calibration factors of exactly:

Multiply the calibration factor by the measured mV signal to convert sensor output to photon flux density in units

of µmol m

-2

-1

Calibration Factor (12.5 µmol m

12.5

LED Output

(100 µmol m

12.5 µmol m

-2

-1

per mA) * Sensor Output Signal (mA) = Photon Flux Density (µmol m

-2

-1

)

Sensor Output

12 mA

-2

-1

per mA

(12 – 4)

Example of photon flux density measurement with an

Apogee model SQ-644 Quantum Light Pollution Sensor.

The LED in this example Full yields a photon flux density on

a horizontal plane of 100 µmol m

signal of 12 mA. This signal is converted to photon flux

density by subtracting the 4.0 mA offset and then

multiplying by the calibration factor of 12.5 mol m

mA.

100

-2

-1

. This yields an output

-2

-1

)

-2

-1