One of the most important characteristics of a sinewave signal is its phase. The phase is the time (instant) for a given signal value on a waveform cycle. Usually, the phase is an expression of the relative time difference between two corresponding features (peaks or zero crossings) of two waveforms having the same frequency. The phase is used in several application fields for indirectly measuring displacement, strain, acceleration, power quality, and for characterizing circuits and components in the frequency domain.
The aim of the tutorial is to present a review of phase measurement systems for sinewave signals. At the beginning, the definition of the phase of a signal and the classification of the phase measurement systems available in the literature will be presented. Then, a short overview of the instrumentation based on event counting, modulation, and sampling based methods for measuring the phase of sinewaves will be carried out. At the end, an innovative method proposed by our laboratory at the University of Sannio (LESIM) in collaboration with NIST (USA) will be described.
Eulalia Balestrieri joined the Department of Engineering, University of Sannio, Benevento, Italy in 2018 as an Assistant Professor in electric and electronic measurement, where she has been involved in the research activities carried out at the Laboratory of Signal Processing and Measurement Information. She received the M.S. degree in software engineering and the Ph.D. degree in information engineering from the University of Sannio in 2003 and 2007, respectively. Her research interests include digital signal processing for measurement in telecommunications, data converter characterization, and medical measurements. She has authored and co-authored more than 50 scientific papers, published on international journals and conference proceedings and is a reviewer of international journals and conferences. Dr. Balestrieri is a member of IMS TC-25 Medical Measurement and IMS TC-10 Waveform Analysis, Generation and Measurement. She participated in the realization of three IEEE standards and is currently involved in the development of the new jitter standard.
Francesco Picariello (IEEE S'15, M'17) received the B.Sc. ('09) and M.Sc. ('12) (cum laude) degree in electronic engineering, from the University of Salerno, Faculty of Engineering. Then, he joined the research activities carried out at the Laboratory of Signal Processing and Measurement Information of the University of Sannio, Benevento, Italy. He received the IEEE Instrumentation and Measurement Society Graduate Fellowship Award in 2015 for the project titled “Assurance of traceability for smartphone-based kinetic measurements”. He received the Ph.D. degree in Information Engineering from the University of Sannio in 2016 and the National Academic Qualification as Associate Professor in June 2020. He is currently working toward the Department of Engineering of the University of Sannio as Assistant Professor. His research interests include electrical and electronic instrumentation, data acquisition systems (DAQ) based on compressive sampling (CS), biomedical instrumentation, embedded systems, distributed measurement systems including wireless sensor networks (WSNs), and Internet-of-Things (IoT) systems. He has authored and co-authored more than 50 scientific papers, published on international journals and conference proceedings. He is a reviewer of international journals and conferences.