Thermoacoustic-reflected focusing lens based on acoustic Bessel-like beam with phase manipulation

• 来源期刊: 中国物理B（英文版）
• 关键词: acoustic focusing Bessel-like beam thermoacoustic phase manipulation
• 年，卷（期）: 2018,（12）
• 页码范围: 367-374
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/12/124301

摘要

We report the realization of broadband refl ected acoustic focusing lenses based on thermoacoustic phased arrays of Bessel-like beams, in which the units of phase manipulation are composed of three rigid insulated boundaries and a thermal insulation film in air with different temperatures. Based on these units, we realize a reflected focusing lens which can focus reflected acoustic energy on a line, and its fractional bandwidth can reach about 0.29. In addition, we discuss the influences of the base angle of Bessel-like beam, the number of basic unit, and the variation of unit temperature on focusing performances in details. Furthermore, the reflected focusing lens for the cylindrical acoustic wave based on the Bessel-like beam is also demonstrated. The proposed focusing lens has the advantages of a broad working bandwidth, large focus size, and high robustness, which may provide possibilities for the design and application of acoustic lenses.