Herold W, Wiegel D
Z Alternsforsch. 1979;34(2):183-7.
Cholesteric liquid crystals show different colors dependent on their temperature. The "thermography with liquid crystals" makes use of this property for the determination of temperature distributions of human skin. The correct photographic documentation of the color patterns is difficult, because the colors depend on the angle of incidence of light and the direction of observation. Further, the quality of the photos is reduced by the direct reflection of light at the surface. Possible geometrical conditions of taking photos are discussed. An optimum arrangement for producing photos without reflections and color changes is proposed.
胆甾相液晶会根据温度呈现出不同颜色。“液晶热成像”利用这一特性来测定人体皮肤的温度分布。由于颜色取决于光的入射角和观察方向，因此很难对颜色图案进行正确的摄影记录。此外，光在表面的直接反射会降低照片质量。文中讨论了拍照可能的几何条件。并提出了一种产生无反射且无颜色变化照片的最佳布置方案。
