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New type of digital phase linearizer for real-time interferometric measurement

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6 Author(s)
Tokuzawa, T. ; National Institute for Fusion Science, Toki 509-5292, Japan ; Kawahata, K. ; Tanaka, K. ; Ito, Y.
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A new type of digital phase linearizer has been developed for real-time electron density measurement using a multichannel far-infrared (FIR) interferometer. The phase linearizer can measure phase shifts up to 640 fringes. The size of internal memory is 16 bits-2 Mwords and the sampling frequency of the waveform data is up to 1 MHz. The internal clock for the counter is selectable to 100 or 200 MHz and the frequencies of the input signals, i.e., the reference signal and the probe one, are around 1 MHz. In the performance test the resolution of the phase components is achieved at 1/100 fringes, which corresponds to the line integrated density of 9.0×1016m-2. For real-time measurements the phase linearizer has digital-to-analog converter (DAC) output. The resolution of DAC output is 12 bits and the amplitude is ± 5 V. The density feedback system on the large helical device has been utilized. © 2001 American Institute of Physics.

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Review of Scientific Instruments  (Volume:72 ,  Issue: 1 )