Photometric studies of diffusely reflecting surfaces with applications to the brightness of the Moon

摘要: A series of light reflectivity measurements has been made on a variety samples in search for materials or surface textures which might reproduce the photometric properties lunar surface, particularly pronounced rise at small phase angles. It found that most terrestrial substances, including standard diffusing surfaces, when observed with an instrument aperture, show prominent if direction observation is within ±5° incident light. Experiments height intensity peak entails complex interrelations particle size, shape, and optical reflector. The abrupt increase brightness zero may not be unusual property moon but one common to substances. An airplane passenger can easily verify this phenomenon by noting bright zone ground around shadow airplane.