Abstract

An experiment was conducted to measure the transmittance of a flowing stream of nitrogen gas that has been seeded with nominal 0.009-μ carbon particles. All measurements were made at 1-atm pressure and room temperature. The measurements were made by passing a beam of light from an external source through the seeded gas stream, and then determining the transmittance with a spectrophotometer. The experimental results show that the absorption cross section decreases as the seed density increases. This is attributed to particle agglomeration. The measurements also show that the transmittance is almost independent of wavelength for wavelengths from 200 to 3500 nm. At a seed density of 10−5 g/cm3, the absorption cross section is between 17 000 and 19 600 cm2/g. At a seed density of 10−4 g/cm3, the absorption cross section is between 10 800 and 13 000 cm2/g.

© 1968 Optical Society of America

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