| Citation: | ZHUANG Z B，WANG W H，TAI H D，et al. Influence of contrast threshold effect on runway visual range measurement[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（11）：2906-2912 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0040
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The influence of eye contrast threshold is neglected in the traditional calculation of daytime runway visual range (RVR). Therefore, this paper first theoretically analyzes the influence of the human eye contrast threshold on RVR measurement range and accuracy. Then, experiments are designed to measure the contrast thresholds of students majoring in flight, control and applied meteorology, which are closely related to the front line of flight, respectively, to explore the differences of contrast thresholds in different light environments and their influence on RVR. According to the experimental findings, flying cadets have a lower contrast threshold and better visibility than the other two types of testing objects. At the same time, the background brightness will also affect the contrast threshold. The contrast threshold decreases with increasing brightness, which is advantageous for RVR observation. When the RVR is between 400 and 800 meters, which is the important node of aviation operations and will have an impact on flight activities, this mistake is acceptable. However, when the RVR is less than 800 meters in bad visibility, it is beyond the specified range. The deviation caused by the contrast threshold should be corrected to ensure flight safety.
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