Apogee Instruments SQ-645 소유자 매뉴얼 - 페이지 12

{카테고리_이름} Apogee Instruments SQ-645에 대한 소유자 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Apogee Instruments SQ-645 16 페이지. Quantum light pollution sensor
Apogee Instruments SQ-645에 대해서도 마찬가지입니다: 소유자 매뉴얼 (16 페이지)

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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

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. 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

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The model SQ-620 Extended Range Quantum Sensor can measure a photon flux density range of 0-4000 mol m

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. 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

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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

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versus 0.05 mV per

mol m

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) to provide greater measurement resolution under low light conditions. For example, if the photon

flux density were 0.1 mol m

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, the SQ-640 would output 0.1 mV, whereas the SQ-620 would output 0.005 mV.