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What does QTW stand for?

QTW stands for Quarter-Wave (Bragg reflection waveguide)

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We have 3 other meanings of QTW in our Acronym Attic

Samples in periodicals archive:

Based on the distribution of the modal amplitudes, the modes can be classified into: 1) the fundamental Helmholtz response; 2) bottle length responses; 3) choke tube length responses; 4) nozzle quarter-wave type response; and 5) other 3D cross modes, which primarily affected the first silencer chamber.
A quarter-wave criterion is applied to show how such errors can be avoided by placing the source at a large distance from the aperture plane, and it is found that in many cases it may be necessary to use collimated light as on the source side of a Fraunhofer experiment.