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LDA flow sensors

PTB-News 2.2015
Especially interesting for

manufacturers of laser Doppler anemometers

power plant operators

Laser Doppler Anemometry (LDA) mea-sures the velocity in liquids optically – i.e. contact-free. A procedure developed at PTB to determine the position of the measuring volume considerably reduces the uncertainty of volume flow determi-nation when calibrating flow sensors by means of LDA. From the power of the backscattered laser light, the path of the interfering beams is reconstructed and the interference fringe interval, the position and the size of the measuring volume are determined. LDA enables the calibration of flow sensors, for example in power plants, at temperatures up to 230 °C and at a pressure up to 40 bar. (Technology Offer #0375)

Flow velocity measurement in a pipe (left: LDA probe; right: optical access)


determining the position of the LDA measuring volume with high precision

reducing the measurement uncertainty

calibrating at high temperatures and high pressures

Contact person for questions about technology transfer

Andreas Barthel,
Phone: +49 (0)531 592-8307,
Opens window for sending emailandreas.barthel(at)ptb.de,
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