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Proceedings Paper

Technical solutions and experience in laser anemometry for underground mining and other industrial and biomedical applications
Author(s): Henryk Passia; Adam Szade; Zbigniew Motyka; Wojciech Bochenek
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Paper Abstract

The structure is presented of a laser Doppler anemometer designed for use in the conditions of underground coal mines. The instrument meets the requirements of explosion proofness, which is one of the methods of fulfilment of requirements for instrumentation to be used in gassy mines. The measuring range is from ca. 1 mm/s to 15 mIs, and therefore covers the range of velocities that are met in the mine ventilation system. Two versions of frequency tracking systems are used in the instrument. The measuring signal can be automatically transmitted up to a distance of 2 km. Operational conditions of the instruments in mines are characterised giving the relationship between the parameters of Doppler signal and those existing in several types of mine workings. A fibre-optical anemometer without electrical elements in the measuring area is presented as a low-cost substitute of that characterised above. In this case, the Doppler anemometer serves to calibrate the latter. The idea and some details ofthe instruments are given in Figs.4, 5and6. An example is given of use of a similar version in measurements of displacements and vibration when pumping up a high-pressure vessel at chemical works. The modules of the above-mentioned Doppler anemometer have been used, with some rearrangement, to study flow characteristics behind the model of an artificial valve of the human heart. The results are given in Fig.3 as FFT transforms ofthe Doppler signal.

Paper Details

Date Published: 22 May 2002
PDF: 8 pages
Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); doi: 10.1117/12.468191
Show Author Affiliations
Henryk Passia, Central Mining Institute (Poland)
Adam Szade, Central Mining Institute (Poland)
Zbigniew Motyka, Central Mining Institute (Poland)
Wojciech Bochenek, Central Mining Institute (Poland)

Published in SPIE Proceedings Vol. 4827:
Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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