Apogee Instruments SQ-100X Series Instrukcja obsługi - Strona 14
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Spectral Errors
Apogee SQ-100X series sensors can measure PPFD for sunlight and electric light with a single calibration factor.
However, errors occur in various light sources due to changes in spectral output. If the light source spectrum is
known, then errors can be estimated and used to adjust the measurements. The weighting function for PPFD is
shown in the graph below, along with the spectral response of Apogee SQ-100X series quantum sensors. The closer
the spectral response matches the defined PPFD spectral weighting functions, the smaller spectral errors will be.
The table below provides spectral error estimates for PPFD measurements from light sources different than the
calibration source. The method of Federer and Tanner (1966) was used to determine spectral errors based on the
PPFD spectral weighting functions, measured sensor spectral response, and radiation source spectral outputs
(measured with a spectroradiometer). This method calculates spectral error and does not consider calibration,
cosine, and temperature errors.
Federer, C. A., and C. B. Tanner, 1966. Sensors for measuring light available for photosynthesis. Ecology 47:654-
657.
McCree, K. J., 1972. The action spectrum, absorptance and quantum yield of photosynthesis in crop plants.
Agricultural Meteorology 9:191-216.