Title :
A High Resolution Displacement Measurement System Based on Time-to-Digital Converter
Author :
Cunlong Li ; Weimin Chen ; Peng Zhang ; Daqing Zheng ; Shiyong Chen ; Rong Yan
Author_Institution :
Key Lab. for Optoelectron. Technol. & Syst., Chongqing Univ., Chongqing, China
Abstract :
A microwave interferometry displacement measurement system based on time-to-digital converter (TDC) is proposed. As the TDC has advantages of high time resolution and linearity, it is introduced to replace common phase detector of microwave interferometer. The system is operating at 2.4 GHz in two-stage heterodyne, and its theoretically estimated displacement resolution is about 3 μm. Under the experimental condition of 50 μm moving step, measured maximum error is 30 μm with the standard deviation of 10.9 μm and the linearity is 0.9997.
Keywords :
UHF measurement; displacement measurement; interferometry; measurement systems; microwave measurement; time-digital conversion; TDC; common phase detector; frequency 2.4 GHz; high resolution displacement measurement system; microwave interferometer; microwave interferometry displacement measurement system; time-to-digital converter; two-stage heterodyne; Displacement measurement; Linearity; Microwave measurement; Phase detection; Displacement measurement; high resolution; linearity; phase detection; time-to-digital converter;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2014.2303168
