IMPROVING THE METHOD FOR MEASURING THE LUMINOUS INTENSITY OF NON-POINT SOURCES

Abstract

In this paper we study change the luminous intensity of non-point sources of optical radiation with increasing distance. Experiments showed a difference in the results obtained at a distance of 3 m to 23 m more than 50%. This error value is not acceptable for any measurement. The true value of luminous intensity is considered to be the value obtained at maximum distance. So in [8] is the requirement of providence measurement at a distance of 25 m. Provide measurements at long range using the appropriate equipment is a difficult task. To conduct the study used the installation of more than 20 m in length. We used different optical systems and light sources. The aim is to develop a simple method for correcting the results of measurement of luminous intensity at short distances. The paper analyzes the existing method [2]. Also, a graph comparing the results without amendment, with the correction to [2], and by the proposed method. Based on [7] as the reference values were selected mark 3 m and 5 m. The analytical formula was formed to obtain corrections to the distance between the radiation source and the optical
receiver. The calculation results showed the dependence of the amendment, and measurement error. The table of relations corrections and errors. A plot of allowable errors from the compensated distance. The limits of applicability of the method. Processing of measurement results using this method does not require a large stand and to improve the accuracy of measurements.  Thus, measurements are taken at a distance of 3 m and 5 m can be calculated to obtain the results of luminous intensity at a distance of 10 m, 25 m and other distance.