Abstract
Analog interpolation is the key technology of high-resolution short time-interval measurement. This study proposes a double interpolation method in time-interval measurement. The technique greatly improves the resolution of the analog time expander, which is based on the principle of charging and discharging of the capacitor. This method can significantly reduce the interpolation time, effectively solve the conflict between high measurement resolution and fast measurement rate. The principle of the time measurement expander based on double interpolation method is described in this paper and compared with the expander based on single interpolation method. Its measurement error is also analyzed in this study.
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