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)
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.
刘 阳, 谭坚文, 曾德平, 钟志明, 陈志聪. 基于虚拟仪器技术的聚焦超声换能器电声转换效率自动测试系统[J]. 中国生物医学工程学报, 2017, 36(3): 322-328.
Liu Yang, Tan Jianwen, Zeng Deping, Zhong Zhiming, Chen Zhicong. Automatic Test System for Electro-Acoustic Conversion Efficiency of Focused Ultrasonic Transducer Based on Virtual Instrumentation Technology. Chinese Journal of Biomedical Engineering, 2017, 36(3): 322-328.
[1] 冯若.我国聚焦超声治疗技术的迅速崛起与展望[J].声学技术, 2011, 30(1):17-20. [2] Kennedy JE.High-intensity focused ultrasound in the treatment of solid tumours[J].Nature Reviews Cancer, 2005, 5(4):321-327. [3] Illing RO, Kennedy JE, Wu Feng,et al.The safety and feasibility of extracorporeal high-intensity focused ultrasound (HIFU) for the treatment of liver and kidney tumours in a western population[J].British Journal of Cancer, 2005, 93(8):890-895. [4] Mustafa ZM, Mohammed A, Khalid SA,et al.High-intensity focused ultrasound (HIFU) in uterine fibroid treatment: review study[J].Polish Journal of Radiology, 2014, 79(1):384-390. [5] 林珍云, 徐键, 王惠云,等.聚焦超声治疗对伴有慢性宫颈炎的不孕患者宫颈局部微环境的影响[J].浙江大学学报(医学版), 2007, 36(5):454-457. [6] 王涛, 陈文直, 李东,等.聚焦超声治疗慢性软组织损伤的临床研究[J].中国超声医学杂志, 2009, 25(1):88-90. [7] Cheng Liangjun, Liu Bing, Ning Bo,et al.High-intensity focused ultrasound for the treatment of allergic rhinitis using nasal endoscopy[J].Experimental & Therapeutic Medicine, 2013, 5(1):320-322. [8] 王智彪,李发琪,冯若.治疗超声原理与应用[M].南京:南京大学出版社, 2008. [9] 郭万学.超声医学[M].北京:人民军医出版社, 2012. [10] IEC 1088-2001.Ultrasonics-piezoceramic transducers-characteristics and measurement methods[S]. [11] IEC 62555-2013.Ultrasonics-power measurement-high intensity therapeutic ultrasound (HITU)transducers and systems[S]. [12] Chen Ying, Xie Limei, Kang Rui.Performance measurement of ultrasonic transducer for surgery application[C]//He Tiemin,eds.Proceedings of International Conference on Computer Science and Electronics Engineering.Hangzhou:IEEE, 2012:506-509. [13] Lee JH, Zhang Shujun, Geng Xuecang,et al.Electroacoustic response of 1-3 piezocomposite transducers for high power applications[J].Applied Physics Letters, 2012, 101(25):253504-253504. [14] 寿文德, 余立立, 段世梅,等.球面聚焦超声换能器的电声特性和测量方法的研究[J].声学技术, 2013, 5(5):379-389. [15] Chen Ginshin, Pan Chiaching, Lin Yuli,et al.Assessing the relationship between the inter-rod coupling and the efficiency of piezocomposite high-intensity focused ultrasound transducers[J].Ultrasonics, 2014, 54(3):789-794. [16] Pichardo S, Silva RR, Rubel O,et al.Efficient driving of piezoelectric transducers using a biaxial driving technique[J].Plos One, 2015, 10(9):1-12. [17] Bouchoux G, Lafon C, Berriet R,et al.Dual-mode ultrasound transducer for image-guided interstitial thermal therapy[J].Ultrasound in Medicine & Biology, 2008, 34(4):607-616. [18] 冯若.超声手册[M].南京:南京大学出版社, 1999. [19] 林书玉.超声换能器的原理及设计[M].北京:科学出版社, 2004. [20] Lafon C, Aptel F, Charrel T,et al.Development of a miniature ultrasonic device for conformal cyclocoagulation : from transducer design to early clinical trials[J].Medical Physics, 2011, 38(6):3812-3812. [21] 寿文德, 余立立, 胡济民,等.使用辐射力天平的超声治疗换能器的电声特性测量方法研究[J].声学技术, 2012, 2(2):107-116. [22] Dupuis A, Allard JF, Morris D,et al.Fabrication and thz loss measurements of porous subwavelength fibers using a directional coupler method[J].Optics Express, 2009, 17(10):8012-8028. [23] 郭北涛, 柳洪义, 曹阳,等.基于虚拟仪器技术的电磁阀综合特性测控系统[J].仪器仪表学报, 2010, 31(2):293-298. [24] 陶蒙, 李文康, 李刚,等.组织工程角膜透明度检测方法研究与评价[J].中国生物医学工程学报, 2014, 33(6):764-768.
