Alignment of an acoustic manipulation device with cepstral analysis of electronic impedance data

Hughes, D.A., Qiu, Y. , Démoré, C., Weijer, C.J. and Cochran, S. (2015) Alignment of an acoustic manipulation device with cepstral analysis of electronic impedance data. Ultrasonics, 56, pp. 172-177. (doi: 10.1016/j.ultras.2014.09.017) (PMID:25448425)

Abstract

Acoustic particle manipulation is an emerging technology that uses ultrasonic standing waves to position objects with pressure gradients and acoustic radiation forces. To produce strong standing waves, the transducer and the reflector must be aligned properly such that they are parallel to each other. This can be a difficult process due to the need to visualise the ultrasound waves and as higher frequencies are introduced, this alignment requires higher accuracy. In this paper, we present a method for aligning acoustic resonators with cepstral analysis. This is a simple signal processing technique that requires only the electrical impedance measurement data of the resonator, which is usually recorded during the fabrication process of the device. We first introduce the mathematical basis of cepstral analysis and then demonstrate and validate it using a computer simulation of an acoustic resonator. Finally, the technique is demonstrated experimentally to create many parallel linear traps for 10 μm fluorescent beads inside an acoustic resonator.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Qiu, Dr Yongqiang and Cochran, Professor Sandy
• Authors: Hughes, D.A., Qiu, Y., Démoré, C., Weijer, C.J., and Cochran, S.
• College/School: College of Science and Engineering > School of Engineering; College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Ultrasonics
• Publisher: Elsevier B.V.
• ISSN: 0041-624X
• ISSN (Online): 1874-9968