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Influence of validation schemes in a laser Doppler anemometer period timing device for frequency measurement

Venkatesh, Prabha (1981) Influence of validation schemes in a laser Doppler anemometer period timing device for frequency measurement. In: Journal Of Physics E-Scientific Instruments, 14 (5). pp. 587-592.

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Official URL: http://www.iop.org/EJ/abstract/0022-3735/14/5/014

Abstract

The short duration of the Doppler signal and noise content in it necessitate a validation scheme to be incorporated in the electronic processor used for frequency measurement, There are several different validation schemes that can be employed in period timing devices. A detailed study of the influence of these validation schemes on the measured frequency has been reported here. These studies were carried out by using a combination of a fast A/D converter and computer. Doppler bursts obtained from an air flow were digitised and stored on magnetic discs. Suitable computer programs were then used to simulate the performance of period timing devices with different validation schemes and the frequency of the stored bursts were evaluated. It is found that best results are obtained when the validation scheme enables frequency measurement to be made over a large number of cycles within the burst.

Item Type: Journal Article
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Additional Information: Copyright of this article belongs to Institute of Physics.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 24 Aug 2009 03:47
Last Modified: 19 Sep 2010 05:37
URI: http://eprints.iisc.ernet.in/id/eprint/21513

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