title: Spiral phase mask shadow-imaging for 3D-measurement of flow fields.
abstract: Particle tracking velocimetry (PTV) is a valuable tool for microfluidic analysis. Especially mixing processes and the environmental interaction of fluids on a microscopic scale are of particular importance for pharmaceutical and biomedical applications. However, currently applied techniques suffer from the lag of instantaneous depth information. Here we present a scan-free, shadow-imaging PTV-technique for 3D trajectory and velocity measurement of flow fields in micro-channels with 2 µm spatial resolution. By using an incoherent light source, one camera and a spatial light modulator (LCoS-SLM) that generates double-images of the seeding particle shadows, it is a simply applicable and highly scalable technique.
authors.forename: Martin
authors.initials: M
authors.lastname: Teich
authors.forename: Michael
authors.initials: M
authors.lastname: Mattern
authors.forename: Jeremy
authors.initials: J
authors.lastname: Sturm
authors.forename: Lars
authors.initials: L
authors.lastname: Büttner
authors.forename: Jürgen W
authors.initials: JW
authors.lastname: Czarske