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Isco TIENet 360 LaserFlow Velocity Sensor Field Test

LaserFlow tested by Environment Agency (UK) in open channel river systems

ISCO LaserFlow field test_from RS Hydro_ John Morris Scientific ISCO LaserFlow evakuation by Environment Agency U.K. and RS Hydro

Mounted above the water surface the Teledyne Isco LaserFlow™ measures point velocity at up to fifteen different points at three different depths below the water’s surface using a laser diode that transmits and receives a focused laser light beam. Velocity is calculated from the Doppler-shifted signal frequency that is returned. This evaluation test was conducted by Environment Agency (Sept. 2014).

Main objectives of the evaluation were to:

  • Evaluate performance of the LaserFlow™ meter against an existing flow gauge.
  • Assess the potential for non-contact LaserFlow™ technology to be used in the Environment Agency flow monitoring network.
  • Determine the installation requirements and operating range of the instrument.

A field test was undertaken to evaluate the performance of the Isco LaserFlow™ in open channel river systems. The accuracy of the flow data has been assessed to determine the potential of using a laser velocimeter in the Environment Agency’s hydrometric network. This report details some results of the evaluation process, testing the instrument under ideal flow measurement conditions. Results show the LaserFlow™ measures discharge to within the measurement uncertainty of the reference flows. Test results indicate the unit would be suitable at locations similar to bed and wall-mounted hydro-acoustics. Its ability to measure velocity in weedy channels also needs investigation. The Laser is a class 3R beam (same classification as a laser pointer in the USA), so installation at sites where the instrument can be accessed by the public should be avoided.

Field Tests:  This test report details the performance of the TIENet™ 360 LaserFlow™ compared against a Sarasota 2000 ultrasonic time-of-flight flow meter and lowTracker spot gaugings. The test site was at the Environment Agency’s stream flow gauging station on the River Leen in Nottingham. The measuring reach has a long straight approach with a symmetrical velocity profile, which limits other sources of error such as skew flow and eddying.

Read ISCO LaserFlow field test report

Many thanks to the Environment Agency and RS Hydro (www.rshydro.co.uk) a UK distributor for the Isco LaserFlow™ and who have kindly shared these field test findings with us.

Want to know more about Isco instrumentation?
Our Evironmental team would love to hear from you
Phone free call AUS 1800 251 799 and free call NZ 0800 651 700
Email:  environmental@johnmorris.com.au

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