LED array light source illuminance distribution and photoelectric detection performance analysis in dust concentration testing system

To improve the reliability of the measurement results of dust concentration and increase the testing range of dust concentration, this paper presents a new light transmission method to measure atmospheric dust concentration. Based on the principles of dust concentration test system, the study focuses on LED array light source illuminance distribution and photoelectric detection performance; analyzes the illumination distribution characteristics and uniformity of the single LED; establishes the illumination distribution calculation model of the array LED uniform light source; deduces a new detection sensitivity and SNR calculation function on dust concentration test system, and research the relationship between dust concentration and sensitivity, SNR and the array LED uniform light source. Through calculation and analysis, the results show that the better the uniformity of the single LED light source, the better the performance of the array LED light source, and the higher the sensitivity of dust concentration test system and the better the test results; By collecting the illuminance of array LED uniform light source in different positions, the illuminance distribution was obtained, the results verifies the established uniform array LED light source model is reasonable and feasible in the dust concentration test system.