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Design of Phase Controlled Ultrasound Excitation System(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2016年04期
Page:
8-
Research Field:
电气与电子工程
Publishing date:

Info

Title:
Design of Phase Controlled Ultrasound Excitation System
Author(s):
Liu Shuyan; Wang Qingdong; Li Yuzhi; Guo Gepu; Ma Qingyu
School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China
Keywords:
phase controlled ultrasound; FPGA; MD2134; narrow-band resonant filter
PACS:
X87
DOI:
10.3969/j.issn.1672-1292.2016.04.002
Abstract:
In order to realize the excitation of phased array in acoustic vortex,a phased ultrasonic excitation system is designed in this paper. Controlled by a FPGA,the chip MD2134 is employed to generate phased signal by using the techniques of waveform storage and narrow-band resonant filter with high integration degree,flexible operation and controllable phase difference. The control codes of chip registers are written by Quartus Ⅱ to generate signals with the controllable phase difference. After D/A conversion and power amplification,the output signals are used to drive the transducer effectively,to generate electrical resonance to drive acoustic waveforms. 8-channel synchronous signals at the frequency of 500 kHz with the phase difference of π/4 are used to drive 8 transducers. The corresponding acoustic signals are detected by a needle hydrophone and collected by an oscilloscope to conduct waveform comparison. The consistent phase differences of the experimental results demonstrate that the designed system is highly integrated with stable amplitudes and phases of the generated acoustic signals,and that the system can be applied in phase controlled ultrasonic system.

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Last Update: 2016-12-31