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Title: New On-Site Calibration Technique For Large Flow Meters Using Laser Doppler Velocimetry
Author: Andy Drysdale, John Frederiksen, Matthew Rasmussen
Source: Flomeko 2005
Year Published: 2005
Abstract: This paper presents a new method of calibrating flow meters of 100 to 1000 mm diameter whilst on-site and in operation using Laser Doppler Velocimetry (LDV). The technique has been tested and demonstrated in the laboratory and in the field. Primarily developed for calibrating district heating meters, the technique is also suitable for measuring flow in other clear fluids. Calibration of installed large district heating meters using traditional methods is difficult, if not impossible. It is often a labour demanding, time consuming and costly task to remove and send a meter for off-site calibration. Using LDV for on-site calibration is an attractive alternative. LDV is an established optical technique for measuring point velocity in clear gasses and fluids and is used in a wide range of R&D applications. Using LDV it is now possible to carry out accredited on-site calibration of large flow meters up to 1000 mm in diameter with water flow velocities from 0.01 to 6.0 m/s.

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