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A cross-correlation optical velocimeter
Smrekar, Jure (Author), Oman, Janez (Author), Širok, Brane (Author), Mori, Mitja (Author), Hočevar, Marko (Author)

URLURL - Presentation file, Visit http://dx.doi.org/10.1088/0957-0233/18/3/003 New window

Abstract
This study presents a newly developed approach to velocity measurements of moist air in a natural-draught cooling tower (CT). It is based on the cross-correlation of two signals acquired from infrared (IR) light-to-voltage optical sensors. The air flowing through the CT becomes supersaturated in CT packings and thus consists of small water droplets of size 4-12 m. The same air usually contains droplets resulting from drift, which drags along too small droplets in the spray zone. When the moist-air droplet pattern crosses the beam emitted by IR light-emitting diodes (LEDs), the optical sensors detect a certain signal. The cross-correlation technique gives the time delay of the measured signals. Therefore, by knowing the distance between the sensors, it is possible to calculate the velocity of the moist air. The methodhas been developed for dynamic velocity measurements of moist air and has achieved a satisfactory precision. The optical velocimeter is a very practical device that makes it possible to carry out measurements on a local basis across the entire plane area of the CT. With the use of simultaneous measurements of velocities and temperatures, the exact location of problems with the packings, nozzles and water distribution system can be thus determined.

Language:English
Keywords:meritve hitrosti, optični senzorji, hladilni stolpi, vlažnost zraka, dignostične metode, termodinamika, velocity measurement, optical sensors, cross-correlation, cooling tower, moist air
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2007
Number of pages:str. 555-560
Numbering:Letn. 18, št. 3
UDC:535:536.7
ISSN on article:0957-0233
COBISS.SI-ID:9834267 Link is opened in a new window
Views:635
Downloads:228
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Record is a part of a journal

Title:Measurement science & technology
Shortened title:Meas. sci. technol.
Publisher:IOP Publishing
ISSN:0957-0233
COBISS.SI-ID:6000901 New window

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