Abstract
A new method of air temperature measurement is discussed. The air motion generates a wide band random signal by a spatial fixed one point sensor. The object is to measure the moving air temperature without natural noise i.e., high frequency irregularity. The basic principle of the measuring method is to observe the natural irregularity of moving air temperature through a spatial multi-point or spatially distributed sensor which forms a kind of spatial hi-cut filter. In this paper, the spatial filter effect has been theoretically analyzed with the concept of power spectral density function. A spatial filter based on this principle has been examined and applied to air temperature measurement. Experimental results show that the analysis is reasonable. This method is applicable to other measurements of a moving object in space.
