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Acousto-Optic Signal Modulation for Atomic Emission Spectrometry Background Correction

Volume 51, Number 6 (June 1997) Page 765-769

Spudich, Thomas M.; Pelz, Brian A.; Carnahan, Jon W.


An acousto-optic diffraction device is mounted within a polychromator to perform spectral shifting for the purpose of background correction for atomic spectrometry. Controlling the applied frequency to the acousto-optic allows ''on-line'' and ''off-line'' spectral observations. Preliminary investigations included characterization of the behavior of the photomultiplier tube (PMT) signal output at various acoustic frequencies and applied powers to verify the applicability of the system. Low-rate (0.1 Hz) frequency modulation was performed to successfully test the applicability of the background-correction system.