A FOUR-CHANNEL PORTABLE SOLAR RADIOMETER FOR MEASURING PARTICULATE AND/OR AEROSOL OPACITY AND CONCENTRATION OF NO2 AND SO2 IN STACK PLUMES

摘要

Solar absorption radiometry has been investigated as a method of measuring stack-plume effluents. A simple and inexpensive instrument was constructed for observing the Sun at four wavelengths: 800, 600, 400, and 310 nm. Higher wavelength channels measured the effect of the particulates and NO2 and an ultraviolet channel measured the contribution of SO2 to the attenuation. Stack-plume measurements of opacity and concentration of NO2 and SO2 were in basic agreement with in-stack measurements. The major limitation on the use of the radiometer is the requirement for an accessible viewing position which allows the Sun-plume-observer relationship to be attained. It was concluded that the solar radi¬ometer offers an inexpensive method for monitoring plume effluents when the viewing posi¬tion is not restricted.