Higher-Order Tyndall Spectraによる球形微粒子の粒度測定について

抄録

The existing theory for measuring the radius of small spherical paticles based on higher-order Tyndall spectra is fundamentally defective in that the energy distribution of light scattered by particles is assumed to be too simple. In fact, the distribution becomes complicate, as χ(=2πR₀/λ⁽⁰⁾) or γ (the angle) increases.
By calculating the chromaticity coordinates of light scattered by particles of 0.40, 0.50, 0.55 and 0.65 μ in radius, and 1.33 in reflactive index, the following conclusions are obtained:
1. Although the theory is defective, the results have few errors; most angles for red given by the theory are in the region of yellowish orange to pink in the chromaticity diagram, and there are no ranges of angles in that region in the diagram which do not include the angles for red.
2. Scattered light is often reddish in the range of angles where J_{1 (628)}/J_{l (523)} is larger than 1.0.