Christos Papageorgiou | Aristotle University of Thessaloniki (original) (raw)
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Papers by Christos Papageorgiou
This paper introduces a different approach to the measurement of the time-of-flight of ultrasonic... more This paper introduces a different approach to the measurement of the time-of-flight of ultrasonic signals. Frequency variation monitoring and recording is used to determine accurately the arrival time of the ultrasonic signal. A high speed Digital Signal Processor (D.S.P.) is used for both: transmission and direct measurement of the frequency of the incoming signal in every single period and with an accuracy of about 0.1%. The proposed configuration offers small size and low cost solution to displacement measurements with a remarkable performance in terms of accuracy, range and measurement time.
A study of the resonance characteristics of low frequency ultrasonic transducers is presented in ... more A study of the resonance characteristics of low frequency ultrasonic transducers is presented in this work. The effect of the influence of the equivalent output resistance of the driving circuits on the shape of the frequency response and the sensitivity of the transducer is investigated. Theoretical presentation is accompanied by simulation analysis and verifying experimental measurements.
Quality Measurement: The Indispensable Bridge between Theory and Reality (No Measurements? No Science! Joint Conference - 1996: IEEE Instrumentation and Measurement Technology Conference and IMEKO Technical Committee 7. Conference Proceedings
A description of the current status and of the capabilities of digital techniques for the measure... more A description of the current status and of the capabilities of digital techniques for the measurement of the three quantities of rotating motion control systems is presented in this work. The analysis covers the requirements of a digital system for the measurement of velocity and acceleration. The use of a 24 bit single-chip digital signal processor in a system developed
ICECS'99. Proceedings of ICECS '99. 6th IEEE International Conference on Electronics, Circuits and Systems (Cat. No.99EX357)
ABSTRACT
Second IEEE International Workshop on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications, 2003. Proceedings
The rapid growth of powerful single-chip microcomputers for monitoring and data acquisition appli... more The rapid growth of powerful single-chip microcomputers for monitoring and data acquisition applications permits nowadays the design of advanced measuring systems. The work reported here is presenting an advanced online monitoring configuration in order to improve the performance and extend the lifetime of ultrasonic transducers by applying an automated testing and calibration technique. The operation of this instrumentation system is based on the fast measurement of frequency and amplitude, performed by the proposed configuration. The combination of this information with the time of flight of each pulse-train is then used to derive practically all characteristics of ultrasonic transducers. Due to its low cost and small size, the system can be used either for characterization and classification of transducers, or as a self-testing and automated calibration section within any high performance ultrasonic system.
IMTC/98 Conference Proceedings. IEEE Instrumentation and Measurement Technology Conference. Where Instrumentation is Going (Cat. No.98CH36222), 1998
ABSTRACT
MELECON '98. 9th Mediterranean Electrotechnical Conference. Proceedings (Cat. No.98CH36056), 1998
This paper introduces a different approach to the measurement of the time-of-flight of ultrasonic... more This paper introduces a different approach to the measurement of the time-of-flight of ultrasonic signals. Frequency variation monitoring and recording is used to determine accurately the arrival time of the ultrasonic signal. A high speed Digital Signal Processor (D.S.P.) is used for both: transmission and direct measurement of the frequency of the incoming signal in every single period and with an accuracy of about 0.1%. The proposed configuration offers small size and low cost solution to displacement measurements with a remarkable performance in terms of accuracy, range and measurement time.
A study of the resonance characteristics of low frequency ultrasonic transducers is presented in ... more A study of the resonance characteristics of low frequency ultrasonic transducers is presented in this work. The effect of the influence of the equivalent output resistance of the driving circuits on the shape of the frequency response and the sensitivity of the transducer is investigated. Theoretical presentation is accompanied by simulation analysis and verifying experimental measurements.
Quality Measurement: The Indispensable Bridge between Theory and Reality (No Measurements? No Science! Joint Conference - 1996: IEEE Instrumentation and Measurement Technology Conference and IMEKO Technical Committee 7. Conference Proceedings
A description of the current status and of the capabilities of digital techniques for the measure... more A description of the current status and of the capabilities of digital techniques for the measurement of the three quantities of rotating motion control systems is presented in this work. The analysis covers the requirements of a digital system for the measurement of velocity and acceleration. The use of a 24 bit single-chip digital signal processor in a system developed
ICECS'99. Proceedings of ICECS '99. 6th IEEE International Conference on Electronics, Circuits and Systems (Cat. No.99EX357)
ABSTRACT
Second IEEE International Workshop on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications, 2003. Proceedings
The rapid growth of powerful single-chip microcomputers for monitoring and data acquisition appli... more The rapid growth of powerful single-chip microcomputers for monitoring and data acquisition applications permits nowadays the design of advanced measuring systems. The work reported here is presenting an advanced online monitoring configuration in order to improve the performance and extend the lifetime of ultrasonic transducers by applying an automated testing and calibration technique. The operation of this instrumentation system is based on the fast measurement of frequency and amplitude, performed by the proposed configuration. The combination of this information with the time of flight of each pulse-train is then used to derive practically all characteristics of ultrasonic transducers. Due to its low cost and small size, the system can be used either for characterization and classification of transducers, or as a self-testing and automated calibration section within any high performance ultrasonic system.
IMTC/98 Conference Proceedings. IEEE Instrumentation and Measurement Technology Conference. Where Instrumentation is Going (Cat. No.98CH36222), 1998
ABSTRACT
MELECON '98. 9th Mediterranean Electrotechnical Conference. Proceedings (Cat. No.98CH36056), 1998