An Instrument for Measuring the Direct Transmission Factor of Luminous Flux in Inhomogeneous Media

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Abstract
The paper presents an instrument for measuring the direct transmission factor of luminous flux in inhomogeneous media. In the first part the basic concepts are introduced and the problem of transmission measurements for the specific case of inhomogeneous solids is defined. The following part examines the typical situation of solid polymers and discusses the main requirements for transmission measurements. The criteria for choosing the apertures and the errors likely to occur are also studied in this section. The instrument is described in § 3. The following section presents the performance of the instrument working as a low-angle light-scattering photo-goniometer and indicates its resolution.

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