Home | Research | Some laboratory facilities | Laser Doppler Anemometer - LDA

Research

Some laboratory facilities


Laser Doppler Anemometer - LDA


173


  • Dantec LDA transmitter
  • Sketch of the LDA system...
  • Laser Coherent Innova and...
  • Process computer with an...
  • LDA probe
  • LDA probe, Dantec FVA signal...


Backscatter, two-component four-beam fibre-optic LDA system (by Dantec Dynamics A/S, Skovlunde, Denmark ). Particularly, the LDA system consists of a 5 W water-cooled argon-ion laser (version Innova 70, by Coherent Inc., Santa Clara, CA, USA ), a 2D fibre flow transmitter (by Dantec Dynamics A/S, Skovlunde, Denmark , which comprises a transmitter providing colour separation and frequency shifting of the laser beam; fibre manipulators for optimum coupling of the laser light into optical fibres; a probe head with a fibre-optical connection to the transmitter; and back-scatter receiving optics including colour filters, colour separation, and photodetectors), a probe with a diameter of 85 mm (by Dantec Dynamics A/S, Skovlunde, Denmark, with a focal length of 310 mm and a beam spacing of 60 mm), and a signal processor (version 58N40 FVA - Flow Velocity Analyzer enhanced, by Dantec Dynamics A/S, Skovlunde, Denmark). The accuracy of velocity measurements is ±2%. Through an AD/DA-Analog to Digital/Digital to Analog board (Keithley Metrabyte model DAS 50/4), the laser Doppler data can be correlated with up to four 12 bit channels of auxiliary inputs coming from four transducers. The entire system is assisted by a process computer.

Stampa Stampa




Prof.
Michele Mossa
PhD
Professor of Hydraulics at the
Polytechnic University of Bari
TECHNICAL UNIVERSITY OF BARI
DICATECh
Department of Civil, Environmental, Land, Building Engineering and Chemistry
Via E. Orabona, 4 - 70125 Bari - ITALY

www.dicatech.poliba.it

LIC
Coastal Engineering Laboratory
Area Universitaria di Valenzano
Strada Provinciale
Valenzano - Casamassima, Km 3, 70010 Valenzano, BARI- ITALY
www.poliba.it/lic