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Reduction of Acoustic Noise in ICP Emission by the Addition of a Chimney

Volume 45, Number 8 (Oct. 1991) Page 1368-1371

Easley, Stuart F.; Monnig, Curtis A.; Hieftje, Gary M.

Noise-amplitude spectra were measured for inductively coupled plasma (ICP) atomic emission spectrometry. These spectra indicate that a significant reduction of noise in the emission signal can be obtained by positioning a chimney over the ICP discharge. In this fashion, noise was reduced in the 200-500 Hz region of the frequency spectrum. The chimney had little effect on flicker (1/f) noise.