Galvanometer-based PIV for liquid flows

T. Schlicke, S.M. Cameron, S.E. Coleman

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A cost-effective Particle Image Velocimetry (PIV) system has been developed that is capable of resolving flow fields at frequencies of up to 200 Hz (covering the typical scales of interest for hydraulic researchers), with recording durations of over 8 min. The system uses a high-speed camera to image flow fields illuminated by a scanning-beam lightsheet, where the lightsheet is generated by a galvanometer-driven mirror (computer controlled) together with a parabolic mirror. The system has several advantages over rotating-polygon type scanning systems, including: that the mirror is always positioned at the focal point of the parabola, and that the lightsheet generation is extremely versatile, with the lightsheet width (for a single parabolic mirror) and beam scan velocities easily and independently adjustable. Additionally, the beam scan velocity, which is typically nonlinear in rotating-polygon systems due to inherent properties of parabolic reflectors, can be constant in a galvanometer-based system (giving a uniform intensity lightsheet) by driving the galvanometer at an unsteady angular velocity. Integrated synchronisation options for the system permit frame-straddling techniques to be used in order to reduce interframe times to below 1 /(camera frame rate). The system also offers additional benefits over equivalent double-pulsed or twin-laser setups that rely on beam expansion by lens systems, and that typically only allow measurement at frequencies up to 50 Hz. Manipulation of the beam diameter using lens systems is outlined. The system has been implemented and used to obtain PIV measurements in flows of water and oil.
Original languageEnglish
Pages (from-to)27-36
Number of pages10
JournalFlow Measurement and Instrumentation
Volume18
Issue number1
DOIs
Publication statusPublished - 1 Mar 2007

Fingerprint

Galvanometers
galvanometers
Liquid Flow
liquid flow
particle image velocimetry
Velocity measurement
Mirrors
mirrors
Liquids
polygons
Lenses
Flow fields
Scanning
flow distribution
Mirror
Flow of water
lenses
High speed cameras
Angular velocity
parabolas

Keywords

  • particle image velocimetry
  • scanning laser
  • flow visualization
  • liquid
  • galvanometer

Cite this

Galvanometer-based PIV for liquid flows. / Schlicke, T.; Cameron, S.M.; Coleman, S.E.

In: Flow Measurement and Instrumentation, Vol. 18, No. 1, 01.03.2007, p. 27-36.

Research output: Contribution to journalArticle

Schlicke, T. ; Cameron, S.M. ; Coleman, S.E. / Galvanometer-based PIV for liquid flows. In: Flow Measurement and Instrumentation. 2007 ; Vol. 18, No. 1. pp. 27-36.
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