A narrow-band correlator based on heterodyne filters

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Abstract
The authors describe a correlator designed for measurements in a steady state plasma device, including the features of heterodyne filtering to obtain extremely narrow bandwidths and signal normalisation by automatic gain control to give an output proportional to the true correlation coefficient. The possible extension of the device to measure triple correlations is discussed. Typical results are presented to show that with a sufficiently narrow bandwidth the device can be used to determine the intrinsic spread in wave number of modes of oscillation of the plasma.

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