Apogee Instruments SE-202 Manual del usuario - Página 13
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Imprimir páginaSensor Calibration
The Apogee unamplified photometric sensor model SE-100 has a standard illuminance (lux) calibration factor of
exactly:
Multiply this calibration factor by the measured mV signal to convert sensor output to illuminance in units of lux:
Calibration Factor (1000 lux per mV) * Sensor Output Signal (mV) = lux (lm m
1000
Full Sunlight
(120000 lux)
Spectral Errors
The combination of the filter and photodiode in Apogee photometric radiometers is designed to provide a spectral
response that matches the CIE 1931 photopic luminosity function. Mismatch between radiometer spectral
response and the photopic luminosity function results in spectral errors for light sources that differ from the
source used to calibrate the radiometer. The table below provides spectral error estimates for illuminance
measurements with Apogee photometric radiometers under various light sources.
1000 lux per mV
*
Sensor Output
120 mV
120
=
Example of illuminance measurement with an
Apogee photometric sensor. Full sunlight yields
an illuminance on a horizontal plane at the
Earth's surface of approximately 120000 lux.
This yields an output signal of 120 mV. The
signal is converted to illuminance by
multiplying by the calibration factor of 1000 lux
per mV.
-2
)
120000