作者：戴敏达1, 邢广振2, 杨平2, 王月兵1
作者单位：1. 中国计量大学计量测试工程学院，浙江 杭州 310018;
2. 中国计量科学研究院，北京 100029
关键词：超声功率;高强度聚焦超声;近场互谱;量热法;非线性
摘要：
针对辐射力天平法与量热法只能获得单一声功率量值，而高强度聚焦声场中焦平面扫描易损坏水听器的问题，开展基于近场互谱的声功率测量研究。搭建单水听器近场互谱测量系统，对声场预聚焦区域两平行平面进行声场扫描；基于互谱声强原理计算电声强频谱，进而通过水听器声压灵敏度幅频响应计算声强与声功率。通过单边互功率谱极坐标变换水听器幅频响应修正的方法，解决非线性声场中水听器幅频响应不平坦带来测量误差的问题。与基于浮力变化原理的量热法对比，超声功率测量偏差小于10%，验证近场互谱法测量高强度聚焦超声功率的有效性。
Study on the measurement method of near-field cross-spectrum for acoustic power of focused transducer
DAI Minda1, XING Guangzhen2, YANG Ping2, WANG Yuebing1
1. College of Metrological Technology and Engineering, China Jiliang University, Hangzhou 310018, China;
2. National Institute of Metrology, Beijing 100029, China
Abstract: Aiming at the problem that radiation force balance method and calorimetry can only obtain a single sound power value, but the focal plane scanning of high intensity focused ultrasound field is vulnerable to damage the hydrophone, the ultrasonic power measurement based on near-field cross-spectrum is carried out.A single hydrophone near-field cross-spectrum measurement system was built to scan the two parallel planes in the pre-focusing region of the sound field.The electroacoustic intensity spectrum is calculated based on the principle of mutual spectral intensity, and then the acoustic intensity and acoustic power are calculated by the amplitude frequency response of the acoustic pressure sensitivity of the hydrophone.The measurement error caused by uneven amplitude and frequency response of hydrophone in nonlinear sound field is solved by correction method of amplitude and frequency response of hydrophone through unilateral cross-power spectrum polar coordinate transformation.Compared with calorimetry based on buoyancy variation principle, the deviation of ultrasonic power measurement is less than 10%, which verifies the effectiveness of near-field cross-spectrum method in measuring high intensity focused ultrasonic power.
Keywords: ultrasonic power;high intensity focused ultrasound;near field cross spectrum;calorimetry;nonlinear
2020, 46(3):39-43 收稿日期: 2018-11-05;收到修改稿日期: 2019-01-03
基金项目: 国家重点研发计划资助（2017YFF0205004）；国家自然科学基金（11474259）
作者简介: 戴敏达(1993-),男,浙江嘉兴市人,硕士研究生,专业方向为水声声功率计量测试研究
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