Transmitted light flux

Spectrex ILI-1000 Particle Counter combines the Prototron with a Particle Profile Attachment (multichannel analyzer). The instrument has been used [118] for examining volcanic ash. AC Fine Dust was used for calibration in eight 5 pm steps, which indicated that accurate data was obtained for sizes above 2 pm. It has also been shown to correlate well with the more tedious filtration and counting method for large volume parenteral liquids [119]. Although semi-transparent containers or liquids reduce the amount of transmitted light flux, the instrument gives valid data for particulates in oil [120]. 

If a sample is illuminated by a parallel light flux with the intensity /g and there is no scattering in the sample (s = 0) and no fluorescence, the incoming light is reduced in intensity and leaves the sample as transmitted light Ij. The reduction over a distance d can be calculated from the two Schuster equations as ... 

Specular transmittance (regular transmittance) n. Of a transparent plastic, the ratio of the light flux transmitted without diffusion to the flux incident (ASTM D 883). 

Transmittance n (ca. 1855) (1) Of light, that fraction of the emitted light of a given wavelength which is not reflected or absorbed, but passes throi h a substance. See Light Transmittance. (2) The ratio of the transmitted radiant flux to the incident flux. 

Another method of expressing color is in terms of luminance, dominant wavelength, and excitation purity. These latter are roughly equivalent to the three recognizable attributes of color lightness, hue, and saturation. Lightness is associated with the relative luminous flux, reflected or transmitted. Hue is associated with the sense of redness, yellowness, blueness, and so forth. Saturation is associated with the strength of hue or the relative admixture with white. The combination of hue and saturation can be described as chromaticity. 

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