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Automatic Test System for Electro-Acoustic Conversion Efficiency of Focused Ultrasonic Transducer Based on Virtual Instrumentation Technology |
Liu Yang1, Tan Jianwen1,2, Zeng Deping1,3*, Zhong Zhiming1, Chen Zhicong3 |
1 (Key Laboratory of Ultrasound Engineering in Medicine Co-Founded by Chongqing and the Ministry of Science and Technology, College of Biomedical Engineering, Chongqing Key Laboratory of Biomedical Engineering, Chongqing Medical University, Chongqing Collaborative Innovation Center for Minimally-invasive and Noninvasive Medicine, Chongqing 400016, China) 2(Chongqing Communication Institute, Chongqing 400035, China) 3(National Engineering Research Center of Ultrasound Medicine, Chongqing 401121, China) |
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Abstract Focused ultrasound transducer is the core of ultrasound therapy device, and the electro-acoustic conversion efficiency is one of the most important indexes to evaluate the performance of the transducer. In practical working conditions, the electro-acoustic conversion characteristic is often used to determine the operating frequency and driving parameters of therapy system. Therefore, the high accuracy, efficiency and convenience of the electro-acoustic conversion characteristics test system are needed. To solve this problem, an automatic test system was constructed in this work. The electrical power meter based on directional couplers was used to measure the input electrical power of the transducer. The acoustic output power of the transducer was measured by radiation force balance. The automatic test software on master computer was developed based on virtual instrumentation technology. It can collect and process the measured data in real time. Based on the developed automatic test system, the electro-acoustic conversion efficiency of a transducer was tested at different frequencies and driving power. The stability of the system was analyzed by the coefficient of variation and compared with the manual test. The results showed that the test system had good accuracy, the single test time was shortened more than 5 times. Under the driving power of 10 W, 20 W and 30 W, the automatic test system (the variable coefficient were 4.06%, 4.31%, 4.65%) was more stable than that manual test (the variable coefficient were 4.14%, 4.69%, 5.83%, respectively), which met the application requirements of the test system.
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Received: 26 July 2016
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