Design and Implementation of an FFT Phase Difference Measuring Method

Abstract:

The conventional phase difference measuring methods in the phase shift laser range finder are usually implemented with complex hardware circuits and phase discrimination algorithm. In this paper an FFT phase difference measuring method is designed and implemented based on STM32F407VG microcontroller. This method takes the advantage of the pre-set and fixed frequency of the beat signal by setting the analog-to-digital conversion rate precisely and making the input data length of FFT integral multiples of the beat signal period. In this way spectrum correction is no need. The hardware circuits and phase discrimination algorithm is simplified. The test results show that the phase difference measuring accuracy of 1/12000 is achieved.

• Periodical: Applied Mechanics and Materials (Volumes 530-531)
• Pages: 105-108
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.530-531.105
• Online since: February 2014
• Authors: Xiong Wei Zhu*, Hui Min Chen
• Keywords: FFT Phase Difference Measurement, Phase Shift Laser Range Finder, STM32F407VG

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