Abstract
A new high-speed optical chopping and demodulation system is described for use in flame photometry. Methods are described which allow integration of signal and noise over many optical pulses of flame energy. The method has been used to develop a direct-reading instrument for sodium, potassium and calcium. With this method, 4 signal channels are integrated simultaneously. With the integration technique, ordinary flame noise is significantly reduced. By using an internal standard, all signal channels are referenced to known energy levels regardless of flame variations.
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