Abstract Based on laser holography, the near-field measurement method of low-frequency focusing transducer was researched, the basic principle of laser holography to measure near-field characteristics was analyzed, and a set of experimental measurement system was constructed. In order to verify the feasibility and accuracy of this method, the sound field of a focusing transducer composed of 25 piezoelectric columns arranged in 5*5 with a frequency of 80kHz and a self focusing acoustic lens on the surface was experimentally tested and calculated by using a laser vibrometer, and the sound pressure amplitude and phase distribution on the vibrating diaphragm 50mm away from the center of the radiation concave surface of the transducer were obtained.Using COMSOL model simulation and hydrophone test, the comparison verifies the high accuracy of the far-field extrapolation results after the laser holographic near-field measurement.
ZHU Shi-yu,WANG Yue-bing,ZHAO Peng, et al. Study on Near-field Sound Pressure of Frequency Focusing Transducer Based on Laser Holography[J]. Acta Metrologica Sinica, 2022, 43(11): 1480-1485.
［1］王月兵, 王世全. 激光反射全息技术在超声换能器近场测量中的应用 ［J］. 声学学报, 2012, 37(1):68-73.
Wang Y B, Wang S Q. The application of laser reflective tomography in near-field measurements of ultrasonic transducers ［J］. Acta Acoustica Sinica, 2012, 37(1):68-73.
［2］Pitts T A, Sagers A, Greenleaf J F. Optical phase contrast measurement of ultrasonic fields ［J］. IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 2001, 48(6):1686-1694.
［3］Remenieras J P, Matar O B, Calle S, et al. Acoustic pressure measurement by acousto-optic tomography［C］// IEEE. Ultrasonics Symposium. 2001.
［4］Bahr L, Lerch R. Beam profile measurements using light refractive tomography ［J］. IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control, 2008, 55(2):405-414.
［5］王世全, 王月兵. 激光干涉法在超声换能器近场全息测量中的应用 ［J］. 声学与电子工程, 2011 (1):32-35.
Wang S Q, Wang Y B. Application of laser interferometry in near field holographic measurement of ultrasonic transducer ［J］. Acoustic and Electronic Engineering, 2011 (1):32-35.
［6］刘海楠, 赵鹏, 叶晓同, 等. 基于近场声全息的聚焦换能器声场测量方法研究 ［J］. 计量学报, 2021, 42(6):780-784.
Liu H N, Zhao P, Ye X T, et al. Research on sound field measurement method of focusing transducer based on near-fieldcoustic holography ［J］. Acta Metrology Sinica, 2021, 42(6):780-784.
［7］熊久鹏, 王月兵, 赵鹏. 一种高频换能器的声场推算方法 ［J］. 计量学报, 2018, 39(6):884-887.
Xiong J P, Wang Y B, Zhao P. A method for estimating sound field of high frequency transducer ［J］. Acta Metrology Sinica, 2018, 39(6):884-887.
［8］郭世旭, 郝振宇, 郑慧峰, 等. 基于近场声全息的高频换能器阵列声场测量方法 ［J］. 计量学报, 2019, 40(3):477-480.
Guo S X, Hao Z Y, Zheng H F, et al. High-frequency Transducer Array Sound Field Measurement Method Based on Near-field Acoustic Holography ［J］. Acta Metrology Sinica, 2019, 40(3):477-480.
［9］何碧霞. 二维阵列高强度聚焦超声探头的研制［D］. 深圳:深圳大学, 2016.
［10］王鸿樟. 换能器与聚焦系统 ［M］. 上海:上海交通大学出版社, 1996.
［11］夏荣民, 寿文德, 孙俊霞, 等. 自聚焦换能器的声场研究 ［J］. 应用声学, 2001 (5):16-20.
Xia R M, Shou W D, Sun J X, et al. The ultrasound field of a self-focusing transducer ［J］. Applied Acoustics, 2001 (5):16-20.
［12］殷敬伟, 郭嘉浩, 刘冰, 等. 换能器近场校准机械扫描控制系统的设计［C］//中国声学学会. 中国声学会第十一届青年学术会议. 西安, 2015:507-510.
［13］李太宝. 计算声学:声场的计算和计算方法［M］. 北 京:科学出版社, 2005:105-111.
［14］陈璐, 郭世旭, 王月兵, 等. 基于近场声全息的重建算法分析与研究 ［J］. 计量学报, 2021, 42(10):1335-1342.
Chen L, Guo S X, Wang Y B, et al. Analysis and research of reconstruction algorithm based on near-field acoustic holography ［J］. Acta Metrology Sinica, 2021, 42(10):1335-1342.
［15］于飞, 陈剑, 李卫兵, 等. 近场声全息方法识别噪声源的实验研究［J］. 振动工程学报, 2004, 17(4):462-466.
Yu F, Chen J, Li W B, et al. Experimental study on the identification of noise sources by near-field acoustic holography［J］. Journal of Vibration Engineering, 2004, 17(4):462-466.
［16］徐亮, 毕传兴, 陈心昭. 加权范数外推方法在声压和质点振速场外推中的性能研究［C］//全国振动理论及应用学术会议. 南京, 2011.
2022, Vol. 43 
