By Howell G M Edwards; Peter Vandenabeele
Content material: advent; half I. ANALYTICAL tools: creation; tools of Visualisation; Vibrational spectroscopy; X-Ray equipment; Nuclear strategies; equipment of separation; Mass spectrometry; Electrochemical thoughts; half II. fabrics: Ceramics and enamels; Glass; Stone; Gemstones/minerals; Obsidian; Pigments and dyes; Icons and work; Metals / corrosion; Biomaterials; Resins, bitumens, tar, coal; Ivory and bones; wooden; Textiles; modern fabrics; half III: QUESTIONS: identity; Authentication; know-how of creation; Provenancing; relationship; Degradation and conservation; nutritional reconstruction; precis; Index
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14 Due to this behaviour, DSCs are inaccurate colour reproduction instruments. In contrast, spectral imaging (see later) utilizes a high number of channels to go beyond these restrictions and allow the acquisition of quantitative information such as accurate colour. 2 Direct Visible Imaging Many analyses on frescoes and archaeological objects such as vessels and clothing, paintings, ancient manuscripts and any other form of heritage-related content start with a thorough visual examination of the artwork and some visible imaging using ordinary light.
Although generally the same cameras and radiation sources can be used as for imaging reflected visible light, digital NIR photography still features some peculiarities. First of all, it is best to remove the internal NIR-blocking filter. 10). Such a modification hugely increases the DSC’s sensitivity to NIR, while retaining the facility to view through the lens (impossible in the film-based approach of pure NIR imaging). 10 23 Modification of the digital imaging array by replacing the hot mirror.
Because the spectral response of common silicon detectors found in the current DSCs decreases quite rapidly towards shorter wavelengths, the effect of such a modification is most noticeable when imaging the NIR waveband. Notwithstanding, the DSC’s responsivity to NUV radiation increases as well, although its sensitivity is far more modest in absolute terms. As was mentioned before, the cut-off wavelength for these imagers is at circa 1100 nm, while the cut-on wavelength can be situated in the 320 nm–370 nm range (for an in-depth overview of sensor sensitivity and DSC modification, see Har35 and Verhoeven29,36).
