"A two-axis scanning goniophotometer has been designed and developed at LIFT . (Laboratorio Ingegneria Fisica Tecnica) at Engineering Department, University of Roma Tre (Rome) and the data compared with those obtained from the . video-projection goniophotometer at an important national Institute of Metrology. By this instrument a correlation between the reflectance and the angle of . incidence will be proposed. This function is useful for all the programs that simulates the dynamics of the energy systems in buildings where, typically, . the reflectance is approximated by a constant, overestimating the values of the solar gains. . "
DE LIETO VOLLARO, R., Demegni, G., Carnielo, E., Botta, F., DE LIETO VOLLARO, E. (2013). Determination of Photometric Properties of Materials for Energy Purposes Through the Experimental Study of a Two-Axis Goniophotometer. INTERNATIONAL JOURNAL OF ENGINEERING AND TECHNOLOGY, 5(5), 4465-4471.