An integrating sphere leaf chamber

A combination of an optical integrating sphere and leaf chamber is described, and some principles of its design are given. It is shown that the number of quanta absorbed by the leaf inside the sphere can be found from measurements of the quantum flux density inside the sphere with and without the leaf present, when certain constant parameters of the sphere are known. Methods for finding these are given. It is not necessary to know leaf area or absorptivity for the quantum yield for photosynthesis to be derived from additional measurement of CO2, fixation.