Journal
APPLIED ACOUSTICS
Volume 175, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2020.107787
Keywords
Liquid Lens; Adjustable focus; Ultrasound imaging; Ultrasound transducers
Categories
Funding
- National Natural Science Foundations of China [61974110]
- Shenzhen Science technology and fundamental research and discipline layout project [JCYJ20170818153048647]
- Young Talent fund of University Association for Science and Technology in Shaanxi, China [20190105]
- National Key Research and Development Program of China [2017YFC0109703]
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The liquid acoustic lens offers flexibility in adjusting the focus position and selecting the refractive index of the liquid, allowing for modification of the lens focal length. By studying the interface curvature and the infused liquid volume, the lens' dependent focus can be accurately controlled. Additionally, the combination of the acoustic lens with a transducer enables magnification imaging without mechanical scanning.
An acoustic lens is an attractive device due to its superior ability to image and focus acoustic beams. Nevertheless, the limitation of such a solid-phase device is apparent in that once an acoustic lens is made, its focal length remains fixed. On the contrary, the liquid acoustic lens can not only flexibly tune the position of focus, but also avoid greater acoustic impedance. This paper presented a liquid acoustic convex lens with a tunable focus. The focal distance of the liquid acoustic lens is derived from the focal length formula of the optical lens group. The interface curvature of the lens and the dependent focus as a function of the infused liquid volume in the lens were studied theoretically and experimentally. Furthermore, the refraction index of the liquid can be accurately selected as needed by adjusting the concentrations of liquid. This also results in a modification of the lens focal length. The magnification ability of this acoustic lens in combination with a single element 6.8 MHz transducer was evaluated by imaging steel probes which were embedded at different position without performing mechanical axial scanning. The error caused by the difference of sound speed between the liquid in the lens and the host medium is corrected. (C) 2020 Elsevier Ltd. All rights reserved.
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