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A high-resolution digital time-interval measurement instrument |
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| Authors: | Domenico Mirri Gaetano Pasini Gaetano Iuculano Fabio Filicori Gabriella Pellegrini and Andrea Gabrielli |
| Affiliation: | a Department of Electrical Engineering, Engineering Faculty, Viale Risorgimento 2, 40136, Bologna, Italy b Department of Electronics, Engineering Faculty, Via S. Marta 5, 50129, Florence, Italy c Department of Electronics, Engineering Faculty, Viale Risorgimento 2, 40136, Bologna, Italy d Department of Applied Mathematics, Engineering Faculty, Via S. Marta 5, 50129, Florence, Italy |
| Abstract: | A new method for time-interval measurements is described and the results of measurements on a prototype are given. This method uses a virtually periodic exponential signal as the reference clock and consists of measuring both the phase deviation and the number of cycles of this clock signal between the beginning and the end of the unknown time-interval. The use of two auxiliary sinusoidal signals in order to measure the phase of the corresponding periodic exponential signal is discussed, also considering the main causes of error. The functional block diagram of the prototype is described in detail and the measurement results show that a resolution improvement of two orders of magnitude with respect to the period of the clock signal can easily be obtained. |
| Keywords: | Analogue technique Resolution enhancement Time-interval measurement |
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