Wideband flat frequency response of thermo-acoustic emission
Wideband flat frequency response of thermo-acoustic emission
复制标题
热声发射的宽带平坦频率响应
DOI：
10.1088/0022-3727/45/34/345401
复制
发表时间：
2012-08-29
影响因子：
3.4
通讯作者：
Wang, Zedong
中科院分区：
文献类型：
--
作者：
Hu, Hanping;Wang, Yandong;Wang, Zedong
热声（TA）超声相对于传统电声超声的许多优势主要归因于其在较宽的频率范围内独特的自然常数（平坦）幅频响应。然而，由于缺乏理论研究，TA平坦频率响应本身的实现至今仍不清楚。本文通过对气体中TA发射的热力耦合和热波穿透深度的分析，阐明了平坦频率响应的机理和规律。揭示了TA超声平坦频率响应存在的频率和空间限制。此外，还介绍了TA材料及其背衬的性能评价和选择技术。因此，从技术角度来看，TA超声的最重要特征被更全面地研究。
Many advantages of thermo-acoustic (TA) ultrasound over the conventional electro-acoustic ultrasound are mainly attributed to its unique nature-constant (flat) amplitude-frequency response over a wide frequency range. However, realization of the TA flat frequency response itself has so far remained unclear due to the lack of theoretical investigation. In this work, using analysis of thermal-mechanical coupling and thermal wave penetration depth for TA emission in gas, the mechanism and regularities of flat frequency response are clarified. The limits of both frequency and space for the existence of flat frequency response of TA ultrasound are revealed. In addition, the performance evaluation and selection techniques for both TA material and its backing are presented. Therefore, the most important feature of TA ultrasound from a technical standpoint is studied more completely.