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光学显现提取技术是无损检测潜在指印的重要技术手段,而照明激发光源的可用光功率及光斑光强分布的均匀性对指印的光学显现效果及检测率具有重要的影响。采用紫外传输液芯光纤作为指印光学显现系统照明激发光源的导光传输元件,实验测量了液芯光纤在紫外光波段的传输特性,得到了266nm激光光束在液芯光纤中的传输效率及其随光纤弯曲半径的变化关系。实现了光纤传输出射光束的均匀光强分布,可满足指印显现提取所需的高功率、均匀照明激发条件。研究结果为液芯光纤应用于指印光学显现系统照明激发光源的导光传输提供了实验依据,具有实际应用价值。
Optical display extraction technology is an important technique for non-destructive testing of potential fingerprints. However, the available optical power of illumination source and the uniformity of light intensity distribution have an important influence on the optical appearance and detection rate of fingerprints. The UV transmission liquid core optical fiber is used as the light guide transmission element of the fingerprint optical display system illumination excitation light source. The transmission characteristics of the liquid core optical fiber in the UV light band are measured experimentally, and the transmission efficiency of the 266nm laser beam in the liquid core optical fiber is obtained. Optical fiber bend radius changes. The uniform light intensity distribution of the outgoing light beam transmitted by the optical fiber is realized, and the high power required for fingerprint identification and extraction is satisfied, and the illumination conditions are uniformly illuminated. The results provide an experimental basis for the liquid crystal optical fiber to be used in guiding light transmission of the illumination system of a fingerprint optical display system, and have practical application value.