title: Application of length vernier in phase coincidence detection and precision frequency measurement.
abstract: For comparison of arbitrary frequency signals, the paper proposed two levels of length vernier based on the time-space relationship are used in three levels of phase coincidence detecting circuits to extract the phase coincidence information by proper logic calculation. The length∕phase of each vernier is respectively corresponding to the accuracy and the resolution of detecting circuit. The time-space relationship is based on high-stability, high-accuracy, and high-speed of signal transmission. The method is effective to reduce the fuzzy region in the phase coincidence information and reach a higher measuring precision.
authors.affiliation: Department of Measurement and Instrument, Xidian University, Xi'an 710071, People's Republic of China. mmiao@mail.xidian.edu.cn
authors.forename: Miao
authors.initials: M
authors.lastname: Miao
authors.forename: Zhou
authors.initials: Z
authors.lastname: Wei
authors.forename: Wang
authors.initials: W
authors.lastname: Bin