Modeling the Light Parameters of the Measurement Station for Testing Small-Sized Objects by Luminance Method

The article discusses issues related to the design structure of a universal measurement environment using a luminance meter. The prepared simulations present different lighting variants allowing for an unambiguous selection of the best lighting parameters achieved on the test plane. The setting of lighting fixtures set in 6 variants was simulated: from the ceiling, simultaneous lighting from the ceiling and floor, only from the floor, hanging luminaires with mapping of photometric solids, luminaires suspended on a 40 cm line directing the light source towards the ceiling, lighting in a measuring tent with lighting of the calculation field. The simulation part was tested in the next stage in real lighting conditions and compared with the results obtained in theory. At both stages, the values were measured at 6 measurement points. Using the LMK meter, photos of the same white sheet of paper were taken to assess the uniformity of the measurement field lighting in real conditions and analyzed using specialized software. The luminance tested on the white measuring card ranged from 159 to 188 cd/m2. The actual uniformity achieved during the measurement is 0.92, and the difference in relation to ideal conditions is 0.08. The discrepancy results from an imperfect representation of the lighting situation in reality compared to the exact conditions adjusted in the simulation environment. The difference of 0.08 compared to the value from the computer visualization is a very good result, illustrating an accurate representation of the station and acceptable uniformity for performing universal measurements.