The estimation of caloric content of vegetation is relevant in areas such as biofuels and forest fire prevention. In this work we explore the transmission mechanism of infrared radiation through a leaf by finite element analysis to determine the energy transmission and reflection. We quantify the absorption inside the leaf using a wavelength at 1064 nm. The results obtained are determined experimentally at incidence normal to the leaf surface. We use an infrared laser source, controlling its power settings and a neutral density filter for step-wise power increments. We assumed a non-porous, uniform material, a constant refractive index. We select a specific absorption coefficient according to the senescent state of the leaf. The results describe the relationship between the absorption measured experimentally and computed by finite element analysis (FEA).
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