Apogee Instruments SQ-600 Series Manuel du propriétaire - Page 12

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Apogee Instruments SQ-600 Series Manuel du propriétaire
Low Light Measurements
Accurate low light measurements are required in flowering and light pollution studies. Research indicates
flowering can be triggered in some plants at photosynthetic and/or far-red photon flux densities less than 0.1 mol
-2
-1
m
s
. The threshold photon flux density at which flowering is triggered is variable among species. Two of the
most light-sensitive species are Poinsettias and Cannabis. For reference, photon flux density of moonlight when
the moon is full and near the minimum zenith angle is 0.005 mol m
-2
-1
s
.
The model SQ-620 Extended Range Quantum Sensor can measure a photon flux density range of 0-4000 mol m
-2
-1
s
. The model SQ-640 Quantum Light Pollution Sensor is designed for low light measurements and can only
measure a photon flux density range of 0-200 mol m
(the sensor will output values beyond, 200 mol m
-2
-1
-2
-1
s
s
,
but these are beyond the linear range of the sensor) and is referred to as the low light version. The sensitivity of
the SQ-640 is twenty times higher than the sensitivity of the SQ-620 (1 mV per mol m
-2
-1
s
versus 0.05 mV per
mol m
-2
-1
s
) to provide greater measurement resolution under low light conditions. For example, if the photon
flux density were 0.1 mol m
-2
-1
s
, the SQ-640 would output 0.1 mV, whereas the SQ-620 would output 0.005 mV.