Geodetski list, Vol. 54 (77) No. 4, 2000.
Original scientific paper
Automated Determination of the Average Air Temperature by Means of Sound Speed and Cross-Correlation Function at Precise Distance Measurement
Nikola Solarić
; Faculty of Geodesy, University of Zagreb, Zagreb, Croatia
Zoran Veršić
; Arhitektonski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Miljenko Vresk
; Zagreb, Hrvatska
Abstract
The paper presents the automated determination of the average air temperature approximately along the light path in precise distance measurement with the electrooptical distance meters. This automation in determining the average temperature is based on the physical fact that the speed of the sound travelling in the air depends on the air temperature. It was therefore necessary to make the instruments that will measure the time of sound spreading from the prism to the electronic distance meter. From the measured time of the sound spreading and the measured distance between the prism and the electrooptical distance meter (not corrected for the temperature influence), the average speed of sound spreading can be calculated and then the average air temperature as well. For that purpose, a simple and light instrument has been made that determines the time of sound spreading by means of cross-correlation function. This instrument can determine an average air temperature approximately along the light path up to about 2 or 3 km.
Keywords
air temperature; average air temperature
Hrčak ID:
290862
URI
Publication date:
31.12.2000.
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