Dual-channel multiplex system for precise measurement of displacement and shape of spectral lines.
The comparison of two spectral lines of almost identical wavelength can be made by recording simultaneously the output of a single spectrometer fed by two sources. The two channels are separated either through time-sharing or through modulation at two different frequencies and synchronous detection. Wavelength shifts as small as 1 mA have been determined for a measured shift/width ratio less than 0.05 on cesium absorption lines broadened by rare gases.
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