Photometer for measuring atomic fluorescence

摘要

In a photometer for measuring atomic fluorescence, a partial light beam is branched off the exciting light beam by means of a mirror having a hole. The partial light beam falls on a scattering disc, from which a reference light beam impinges upon the detector through opposite windows of the measuring cell. A chopper alternately transmits the exciting light beam and the partial light beam. The signal thus obtained at the detector permits compensation of the influence of variations of the light source brightness and of contamination of the windows.