聚焦超声换能器参数测量技术研究

发布时间：2018-12-11 12:03

【摘要】：聚焦超声换能器声场参数的测量与研究能够为超声换能器在诊断超声和治疗超声等工业或医学领域应用提供有效的依据。然而,针对聚焦超声换能器发射的大功率,高强度,高温度等特点,其测量研究会受到测量方法和测量仪器的限制,造成实际测量结果的不稳定或不准确。因此,对于聚焦超声换能器声场参数的测量就提出了更高的要求和任务。本文中针对工业无损检测换能器和医用超声换能器,开展多个参数测量研究工作,主要内容有： (1)超声换能器的频谱特性是反映超声换能器自身特性的重要参数,主要包括中心频率、峰值频率和带宽。本文在脉冲回波法的基础上,采用水听器法进行超声换能器频谱特性分析。 (2)对于平面和聚焦超声换能器超声功率采用浮力变化的量热法测量。根据测量原理搭建了超声功率的实验测量系统,并根据不同的超声换能器和不同的测量方法验证测量系统的稳定性和方法的可行性。本文针对高强度聚焦超声换能器的功率进行了测量,并对测量结果进行了不确定度分析。 (3)采用针状和光纤水听器对聚焦超声换能器进行声场扫查,利用水听器接收的声场数据进行二维成像和对该聚焦声场参数进行计算。不仅如此,根据测量的多个平面的声场数据,本文给出了一种声场三维成像的方法,并且成像结果效果良好。
[Abstract]:The measurement and study of ultrasonic field parameters of focused ultrasound transducer can provide an effective basis for the application of ultrasonic transducer in the industrial or medical fields such as diagnosis and treatment of ultrasound. However, in view of the characteristics of high power, high intensity and high temperature of focused ultrasonic transducer, its measurement research will be limited by the measuring methods and instruments, resulting in the instability or inaccuracy of the actual measurement results. Therefore, the measurement of the acoustic field parameters of the focused ultrasonic transducer puts forward higher requirements and tasks. In this paper, a number of parameter measurements are carried out for industrial nondestructive testing transducers and medical ultrasonic transducers. The main contents are as follows: (1) the spectrum characteristics of ultrasonic transducers are important parameters reflecting the characteristics of ultrasonic transducers. It mainly includes center frequency, peak frequency and bandwidth. Based on the pulse echo method, the hydrophone method is used to analyze the spectrum characteristics of ultrasonic transducer. (2) the ultrasonic power of planar and focused ultrasonic transducers is measured by calorimetric method with buoyancy variation. According to the principle of measurement, the experimental measurement system of ultrasonic power is built, and the stability and feasibility of the measurement system are verified according to different ultrasonic transducer and different measuring methods. In this paper, the power of high intensity focused ultrasonic transducer is measured, and the uncertainty of the measurement result is analyzed. (3) Acoustic field scanning of focused ultrasonic transducer is carried out by using needle and fiber optic hydrophone, and two-dimensional imaging and calculation of the focused sound field parameters are carried out by using the acoustic field data received by the hydrophone. Moreover, according to the measured acoustic field data of multiple planes, this paper presents a sound field 3D imaging method, and the imaging results are good.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB552

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