發(fā)布時間：2018-12-11 12:03

【摘要】：聚焦超聲換能器聲場參數(shù)的測量與研究能夠為超聲換能器在診斷超聲和治療超聲等工業(yè)或醫(yī)學(xué)領(lǐng)域應(yīng)用提供有效的依據(jù)。然而,針對聚焦超聲換能器發(fā)射的大功率,高強(qiáng)度,高溫度等特點,其測量研究會受到測量方法和測量儀器的限制,造成實際測量結(jié)果的不穩(wěn)定或不準(zhǔn)確。因此,對于聚焦超聲換能器聲場參數(shù)的測量就提出了更高的要求和任務(wù)。本文中針對工業(yè)無損檢測換能器和醫(yī)用超聲換能器,開展多個參數(shù)測量研究工作,主要內(nèi)容有： (1)超聲換能器的頻譜特性是反映超聲換能器自身特性的重要參數(shù),主要包括中心頻率、峰值頻率和帶寬。本文在脈沖回波法的基礎(chǔ)上,采用水聽器法進(jìn)行超聲換能器頻譜特性分析。 (2)對于平面和聚焦超聲換能器超聲功率采用浮力變化的量熱法測量。根據(jù)測量原理搭建了超聲功率的實驗測量系統(tǒng),并根據(jù)不同的超聲換能器和不同的測量方法驗證測量系統(tǒng)的穩(wěn)定性和方法的可行性。本文針對高強(qiáng)度聚焦超聲換能器的功率進(jìn)行了測量,并對測量結(jié)果進(jìn)行了不確定度分析。 (3)采用針狀和光纖水聽器對聚焦超聲換能器進(jìn)行聲場掃查,利用水聽器接收的聲場數(shù)據(jù)進(jìn)行二維成像和對該聚焦聲場參數(shù)進(jìn)行計算。不僅如此,根據(jù)測量的多個平面的聲場數(shù)據(jù),本文給出了一種聲場三維成像的方法,并且成像結(jié)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.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TB552

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本文編號：2372518