2. Measurement Principle

– Gas flow is rarely laminar. Turbulence in the flow produces a series of swirling eddies and vortices that are transported with the bulk flow. Infrared radiation, emitted by a hot gas system, is characterised by a flickering signal resulting from the swirling effect of these vortices. Two infrared detectors, placed a small distance apart, will produce very similar flickering signals, but with a displacement in time equivalent to the time taken for the bulk gas flow to carry the vortices from the first detector to the second.
– The V-CEM5100 uses a cross-correlation technique to measure this time displacement and hence the flow. The two signals from the infrared transducer units are defined as A(t) and B(t) as shown below […].


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