Abstract:

According to timespace conversion relationship of signals and phase coincidence detection technology, a superhigh precision frequency measurement method is proposed based on length vernier in order to improve measurement resolution of signal. High accuracy and stability of the speed of light and electromagnetic signals during the transmission in space or specific medium enable the measurement of short time interval, which uses the coincidence detection of signal’s transmission delay in length. Based on this, measurement precision from ns to 10ps can be easily obtained. The method develops the length vernier utilizing the stability of signal’s transmission delay, minimizes the fuzzy region of phase coincidence between the standard frequency signal and the measured signal, approaches the best phase coincidences, and therefore improves the measurement precision that is higher than the precision provided by the traditional methods based on frequency processing. Besides, the method costs less than the traditional methods and can also solve the problem of the measurement of superhigh frequency.

Key words: timespace relationship, delaytime and phase shift, length vernier, phase coincidence detection