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| The Phase Difference Evaluation Based on Total Least-square Method with Partial Period Sinusoidal Waveforms |
| LIANG Zhi-guo |
| National Key Laboratory of Science and Technology on Metrology & Calibration, Changcheng Institute of Metrology and Measurement, Beijing 100095, China |
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Abstract Aiming at the phase measurement problems of partial period sine wave, a novel phase difference measurement method is introduced. By using the sinusoidal curve-fit method with partial wave period, the phase difference can be attained. The courses and principles are presented in detail. Through local distortion and noise to signal ratio, and using the simulation in the condition of real measurement parameter, the measurement uncertainty of phase difference can be estimated. Finally, in the calibration of Laser Doppler Velocimeter, a comparative experiment is executed, the result shows that, in about 0.5 period sinusoidal waveform, one can get excellent phase difference in deed, the deviation between partial period and multi periods signals is only about 1°. The validity and feasibility are proved, and it must be a novel phase difference measurement method.
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Received: 02 April 2015
Published: 31 May 2016
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Corresponding Authors:
Zhi-Guo LIANG
E-mail: lzg304@sina.com
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2016, Vol. 37 
