Abstract
A permittivity measurement system operating in the terahertz waveband around 300 GHz achieves fast measurement by using a self-heterodyne technique to measure phase differences. Errors are reduced because a multitone technique with nonuniform frequency intervals enables us to apply a phase-unwrapping method to the self-heterodyne system. For multitone signal generation, just single-frequency oscillators and local oscillator leakage from a modulator are used. The system achieves a measurement time of 0.03 ms at one point, which is 1/200 compared to a conventional system using a vector network analyzer. With the same measurement time, the maximum measurement error can be reduced to less than half compared to the conventional two-tone self-heterodyne system.
Original language | English |
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Article number | 8400543 |
Pages (from-to) | 4649-4657 |
Number of pages | 9 |
Journal | IEEE Transactions on Microwave Theory and Techniques |
Volume | 66 |
Issue number | 10 |
DOIs | |
Publication status | Published - Oct 2018 |
Keywords
- High-speed measurement
- multitone unwrapping
- nondestructive inspection
- permittivity measurement
- phase slope
- self-heterodyne
- terahertz (THz)
- thickness measurement
ASJC Scopus subject areas
- Radiation
- Condensed Matter Physics
- Electrical and Electronic Engineering