Tunable-angle wedge transducer for improved acoustophoretic control in a microfluidic chip

I. Iranmanesh, Rune Barnkob, Henrik Bruus, M Wiklund

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


We present a tunable-angle wedge ultrasound transducer for improved control of microparticle acoustophoresis in a microfluidic chip. The transducer is investigated by analyzing the pattern of aligned particles and induced
acoustic energy density while varying the system geometry, transducer coupling angle, and transducer actuation method (single-frequency actuation or frequency-modulation actuation). The energy-density analysis is based on measuring the transmitted light intensity through a microfluidic channel filled with a suspension of 5-μm-diameter beads and the results with the tunable-angle transducer are compared with the results from actuation by a standard planar transducer in order to decouple the influence from change in coupling angle and change in system geometry. We find in this work that the transducer coupling angle is the more important parameter compared to the concomitant change in geometry and that the coupling angle may be used as an additional tuning parameter for improved acoustophoretic control with single-frequency actuation. Further, we find that frequency-modulation actuation is suitable for diminishing such tuning effects and that it is a robust method to produce uniform particle patterns with average acoustic energy densities comparable to those obtained using single-frequency actuation.
Original languageEnglish
Title of host publicationProceedings of the International Congress on Ultrasonics 2013
Number of pages22
Publication date2012
Publication statusPublished - 2012
EventInternational Congress on Ultrasonics (ICU 2013) - Singapore, Singapore
Duration: 2 May 20135 May 2013


ConferenceInternational Congress on Ultrasonics (ICU 2013)

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