光学学报, 2012, 32 (9): 0908001, 网络出版: 2012-10-18   

基于声光折射的聚焦超声焦点声压检测

Measurement of Acoustic Pressure of the Focused Ultrasound at Focus Based on Acousto-Optic Refraction
周慧婷 1,2,*吕朋 1,2廖长义 1,2王华 1,2沈勇 1,2
作者单位
1 重庆医科大学生物医学工程学院,省部共建超声医学工程国家重点实验室,超声医学工程重庆市市级重点实验室, 重庆 400016
2 超声医疗国家工程研究中心, 重庆 401121
摘要
提出了一种基于声光折射对聚焦超声焦点声压进行非侵入式检测的方法。当一束直径小于声波长的平行光束入射穿过聚焦超声的焦点时,通过研究焦点声压与光线偏转的具体关系,建立了光线最大偏转距离与焦点声压变化的关系模型,从而计算出焦点峰值声压。为了对理论模型进行验证,采用凹球面型聚焦换能器进行实验研究。通过与采用光纤水听器测量的结果进行对比,证明理论模型的可行性。结果表明实验得到的光斑图像与理论分析的结果一致,且用该方法测得的焦点峰值声压与光纤水听器测量的结果相比,相对误差小于15%,证明该方法具有可行性,能够定量检测焦点峰值声压。模型的提出也为将声光折射效应用于整个聚焦声场的定量检测提供了实验依据和理论依据。
Abstract
Based on acousto-optic refraction, a non-invasive method used for detecting acoustic pressure of the focus of focused ultrasound is proposed. By studying the specific relationship between acoustic pressure of the focus and the ray deflection when a parallel beam whose diameter is less than the wavelength of the sound wave is crossing the focus of the focused ultrasound, a relational model between the maximum deflection distance of the ray and the change of the focus acoustic pressure is established, thus the peak acoustic pressure of the focus is calculated. In order to verify the theoretical model, the concave sphere type focused transducers are used for experiment research. By comparing with the result measured by optical fiber hydrophone, the feasibility of the theoretical model is proved. The results show that the facula images acquired in experiment are consistent with the results of theoretical analysis, and the relative error between the acoustic pressure of the focus measured by current method and that by using optical fiber hydrophone is less than 15%, which proves the feasibility of the method. And it can be used to detect the peak acoustic pressure of the focus quantificationally. The proposition of this model provides the experimental and theoretical evidence for that the acousto-optic refraction effect can be used to measure the whole focused ultrasound field quantificationally.

周慧婷, 吕朋, 廖长义, 王华, 沈勇. 基于声光折射的聚焦超声焦点声压检测[J]. 光学学报, 2012, 32(9): 0908001. Zhou Huiting, Lü Peng, Liao Changyi, Wang Hua, Shen Yong. Measurement of Acoustic Pressure of the Focused Ultrasound at Focus Based on Acousto-Optic Refraction[J]. Acta Optica Sinica, 2012, 32(9): 0908001.

本文已被 1 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!