博物馆照明中照度与时间对染色文物的损伤规律

The Damage Law of Illumination and Time on Dyed Artworks in Museum Lighting

染色文物具有很高的光敏感性,极易受到照明的影响发生褪色和变色等不可逆的永久性色彩损伤,得到损伤规律是降低染色文物照明损伤的前提。本研究选择在可见波段功率较为平均的D55为光源,在4种照度水平下分别对21种绘画颜料样品进行1200 h的照射实验,每120 h对样品进行色彩参数测试并计算色差值。通过多项式拟合方法建立色彩损伤度评价方程组ΔE=f_(i)(I,t)(其中i=1,2,3,…,21),得到21种颜料色差ΔE随照度I和时间t变化的三维可视化曲面图,揭示了照度和时间对不同颜料的色彩损伤规律,实现了损伤规律的数学描述。

Dyed cultural relics are highly photosensitive and highly susceptible to irreversible permanent color damage such as fading and discoloration from the effects of lighting.Gaining the damage law is a prerequisite for reducing the damage.In this study,D55,which has a relatively average spectral power distribution in the visible band,was selected as the light source,and 21 pigment samples were irradiated for 1200 hours at four illumination levels,and the color parameters were tested and the color difference values were calculated every 120 hours.A polynomial fitting method was used to establish a set of color damage evaluation equationsΔE=f_(i)(I,t)(where i=1,2,3,…,21),and a three-dimensional visualization surface plot of the color differenceΔE of 21 pigments with illumination I and time t was obtained,which revealed the color damage law of different pigments by illumination and time and realized the mathematical description of the damage law.