Abstract
The bidirectional reflectance distribution function (BRDF) data in the ultraviolet (UV) band are valuable for many applications including cultural heritage, material analysis, surface characterization, and trace detection. We present a BRDF measurement instrument working in the near- and middle-UV spectral range. The instrument includes a collimated UV light source, a rotation stage, a UV imaging spectrometer, and a control computer. The data captured by the proposed instrument describe spatial, spectral, and angular variations of the light scattering from a sample surface. Such a multidimensional dataset of an example sample is captured by the proposed instrument and analyzed by a k-mean clustering algorithm to separate surface regions with same material but different surface roughnesses. The clustering results show that the angular dimension of the dataset can be exploited for surface roughness characterization. The two clustered BRDFs are fitted to a theoretical BRDF model. The fitting results show good agreement between the measurement data and the theoretical model.
Highlights
The bidirectional reflectance distribution function (BRDF) data in the ultraviolet (UV) band are valuable for many applications
We present a BRDF measurement instrument equipped with a broadband UV light source and a UV imaging spectrometer
We present a BRDF measurement instrument and experimentally demonstrate that it is able to capture spatially varying multispectral BRDF data in the near- and middle-UV bands
Summary
The bidirectional reflectance distribution function (BRDF) data in the ultraviolet (UV) band are valuable for many applications. One common approach to improve the efficiency of the measurement instrument is to use an imaging device as the detector, which captures two-dimensional intensity data with one snapshot. The setup makes it possible to measure spatially varying BRDF (SVBRDF). The development of the multispectral/hyperspectral imaging technology has provided new imaging devices in the UV band, such as the UV imaging spectrometers.[1,2,3] Such an instrument is capable of capturing images with good spatial and spectral resolution in near- and middle-UV bands
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