Quantum Meters measure instantaneous Photosynthetic Photon Flux (PPF) in
µmol m-2 s-1.
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COSINE RESPONSE
A “cosine corrected” sensor is designed to
maintain its accuracy when radiation comes from different
angles. For quantum sensors this is important for measuring
scattered light, typical in under-canopy measurements.
Apogee sensors achieve this through the curvature and
optical qualities of the convex lens.
Our long term tests indicate that the cosine errors between
completely sunny and heavily overcast days are less than 0.5
%. Cosine errors between the summer and the winter solstice
are also less than 0.5%. |
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