中国激光, 2001, 28 (10): 925, 网络出版: 2006-08-10  

无透镜隐形条型码的研究

Research of Lensless Hidden Bar Code
作者单位
1 华东船舶工业学院基础学科系,镇江 212003
2 南京大学物理系,南京 210093
摘要
提出了一种新型光学衍射条型码(DOBC).该条型码所包含的信息不是通过扫描器对条码的宽度、位置直接阅读而获得,而是通过光的衍射在其第一衍射级上显示而得到,此种条型码的外形看不出其内容,故称为隐形条型码.并提出一种制作隐形条型码的方法,利用菲涅耳波带片调制,制作成具有自聚焦功能的隐形条型码.对该隐形条型码进行了测试分析,并与用其他方法制作的隐形条型码进行了比较,实验结果表明其实际应用的可行性,且效果比其他方法要好.
Abstract
A new type of diffractive optical bar code (DOBC), which is different from the general bar code (GBC) and the hidden bar code (HBC) formed by CGH methods or grating modulated method, is proposed in this paper. Instead of reading bar code directly, the code information can be obtained from the first diffraction order of the bar code. The diffraction of the conventional HBC made by other techniques need to be focalized by a lens in its focal plane. By using Fresnel zone plate′s focusing function, and combining the HBC with Fresnel zone plate, a new type of HBC which has self focusing function is generated. The feasibility of the LHBC is proved by the experiments, confirming that the proposed HBC can be read more easily and has better performance than the HBC.

仲志强, 周进, 丁剑平, 高文琦. 无透镜隐形条型码的研究[J]. 中国激光, 2001, 28(10): 925. 仲志强, 周进, 丁剑平, 高文琦. Research of Lensless Hidden Bar Code[J]. Chinese Journal of Lasers, 2001, 28(10): 925.

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