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IQ Detector Phase Measurement Algorithm Based on Center Aligned Fourier Transform

Seong-Heon Seo

Fusion Science and Technology / Volume 55 / Number 2T / February 2009 / Pages 176-179

Technical Paper / Seventh International Conference on Open Magnetic Systems for Plasma Confinement /

An FM reflectometer is developed to measure the density profile of the MP2 device. It operates in the frequency range of 7.78-12.38 GHz. Phase information is obtained by digitizing the IQ detector outputs. However, the measured signal is significantly contaminated by noise due to microwave reflection at various points because the emitting and receiving antennas are installed outside of the vacuum window. A center aligned Fourier transform is used to remove the noise and extract the correct phase information from the measurement. In this paper, data analysis techniques are introducedplasma density profile is shown.

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