Study on the Visibility Performance of Nocturnal Safety Clothing Based on Luminescent Fabrics

To evaluate the visibility of nocturnal safety clothing, two groups clothing samples were designed with luminescent fabrics of different weaving method and color. By measuring luminescent and visible properties, the visibility of nocturnal safety clothing was studied and evaluated. The luminescent properties of luminescent fabrics are determined by the raw luminous materials and luminous fibers, and they both emit green light. The afterglow measurements suggested that the white-coated nocturnal safety clothing had highest brightness with an initial brightness of 0.8742 cd/m² and plateau brightness of 0.0477 cd/m². Furthermore, tests of visible duration and distance demonstrated that the white-coated nocturnal safety clothing had the best identification performance with the maximum visual distance of 20 m and maximum visual time of 20 min. Moreover, eye tracking measurements demonstrated that fixation location was greatly focused on the striped nocturnal safety clothing and white-coated nocturnal safety clothing, both of which had the best fixation frequency too. Therefore, the investigated results indicated that both fabric weaving method and color affected the visibility performance of nocturnal safety clothing, and the coated fabrics, especially white-coated fabric and striped-coated fabric had a great advantage for designing nocturnal safety clothing.