Abstract
The temporal variations of electron density of shock-produced Ar plasma were measured by a CO_2 laser heterodyne interferometer. The 20MHz beat signal was produced with an acousto-optic modulator and the interference signal was detected by a HgCdTe detector. The extractions of the phase data were performed for a single shot by simultaneously applying two methods, i.e. the quadrature detection method and the Fourier analysis method. Simultaneous measurements of electron density of fast moving plasma have been achieved. The comparison of the results by both methods shows good agreement.
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