A Light Scattering Photometer Using Photographic Film

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Abstract
A light scattering photometer which uses a 5 mW helium‐neon laser as a light source and red‐sensitive film as the detection system is described. The film records the scattered intensity for scattering angles from 3° to 80° and from 100° to 177°. Corrections are made for refraction effects in the light scattering cell. Developed film is read with a densitometer, and film density is converted to relative scattering intensity. The quality of the light transmitted through the developed film in the densitometer is examined. This device has been tested using uniform 10.9 μ diam polystyrene spheres. The measured pattern agrees quite well with theoretical predictions.