School of Engineering, Physics and Mathematics, University of Dundee, Dundee DD1 4HN, UK.
Ultrasonics. 2014 Jan;54(1):187-94. doi: 10.1016/j.ultras.2013.07.001. Epub 2013 Jul 11.
Resonant frequency shift and electrical impedance variation are common phenomena in the application of high power ultrasonic transducers, e.g. in focused ultrasound surgery and in cutting. They result in low power efficiency and unstable vibration amplitude. To solve this problem, a driving and measurement system has been developed to track the resonance of high power transducers and to stabilise their vibration velocity. This has the ability to monitor the operating and performance parameters of the ultrasonic transducers in real time. The configuration of the system, with its control algorithm implemented in LabVIEW (National Instruments, Newbury, UK), ensures flexibility to suit different transducers and load conditions. In addition, with different programs, it can be utilised as a high power impedance analyser or an instantaneous electrical power measurement system for frequencies in the MHz range. The effectiveness of this system has been demonstrated in detailed studies. With it, high transducer performance at high power can be achieved and monitored in real time.
在大功率超声换能器的应用中，如聚焦超声手术和切割中，共振频率偏移和电阻抗变化是常见现象。它们导致低功率效率和不稳定的振动幅度。为了解决这个问题，开发了一种驱动和测量系统来跟踪大功率换能器的共振并稳定其振动速度。它具有实时监测超声换能器工作和性能参数的能力。该系统的配置及其在 LabVIEW（美国国家仪器公司，英国纽伯里）中实现的控制算法确保了其灵活性，以适应不同的换能器和负载条件。此外，通过不同的程序，它可以用作高功率阻抗分析仪或用于 MHz 范围内频率的瞬时电功率测量系统。该系统的有效性已在详细研究中得到证明。有了它，可以实现高功率下的高换能器性能，并实时进行监测。
