Use of spectral integrating nephelometer for investigations of the scattering coefficient

摘要

The results of measurements with an automatic integrating nephelometer intended for recording of molecular and aerosol scattering coefficients are discussed. The diffraction grid was used as a dispersive element. The frequency range of recording of molecular and aerosol scattering coefficients was from 300 to 820 nm. The spectral calibration of the device with the help of gases with known scattering coefficients is discussed, the evaluation of sensitivity of the nephelometer with use of the calibrated source of photons is considered. The measurements of dynamic range of the nephelometer are presented. It is shown that the device has dynamic range about 5 orders. The measurements Of scattering coefficient in room conditions and outdoors are considered. The use of the nephelometer for continuous extended in situ observations of the scattering coefficient is discussed. High frequency of data recording permits us to use the nephelometer for estimation of turbulent aerosol flows, if the measurements of components of a wind velocity will be carried out synchronously with use of the nephelometer.