title: Imaging local acoustic pressure in microchannels.
abstract: A method for determining the spatially resolved acoustic field inside a water-filled microchannel is presented. The acoustic field, both amplitude and phase, is determined by measuring the change of the index of refraction of the water due to local pressure using stroboscopic illumination. Pressure distributions are measured for the fundamental pressure resonance in the water and two higher harmonic modes. By combining measurement at a range of excitation frequencies, a frequency map of modes is made, from which the spectral line width and Q-factor of individual resonances can be obtained.
authors.forename: Jorick Van't
authors.initials: JV
authors.lastname: Oever
authors.forename: Raimond
authors.initials: R
authors.lastname: Frentrop
authors.forename: Daniel
authors.initials: D
authors.lastname: Wijnperlé
authors.forename: Herman
authors.initials: H
authors.lastname: Offerhaus
authors.forename: Dirk
authors.initials: D
authors.lastname: van den Ende
authors.forename: Jennifer
authors.initials: J
authors.lastname: Herek
authors.forename: Frieder
authors.initials: F
authors.lastname: Mugele