THE USE OF PHOTOMETRY IN THE PROCESSES OF ILLUMINATION OF REPRESENTING OBJECTS

Abstract

Photometry, a branch of applied physics concerned with the measurement of light. In terms of photometry, light is radiation capable of producing a sensation of brightness when exposed to the human eye. This feeling is caused by radiation with wavelengths from ~0.38 to ~0.78 μm, with the brightest being radiation with a wavelength of approx. 0.555 µm (yellow-green). Since the sensitivity of the eye to different wavelengths varies from person to person, a number of conventions are accepted in photometry. In 1931, the International Commission on Illumination (CIE) introduced the concept of a "standard observer" as a kind of average for people with normal perception. This CIE standard is nothing more than a table of values for the relative luminous efficiency of radiation with wavelengths in the range from 0.380 to 0.780 microns every 0.001 microns. On fig. 1 shows a graph constructed according to this table, and it shows the intervals of wavelengths corresponding to the colors of the solar spectrum. Luminance measured according to the CIE standard is called photometric luminance or simply luminance.