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Study on High Detection Resolution for Two-Dimensional Bar-Code Detection System

二维条码检测系统高检测分辨率的研究

基本信息

批准号：
14550433
负责人：
WAKAUMI Hiroo
金额：
$ 0.58万
依托单位：
Tokyo Metropolitan College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550433/
关键词：
Optical detection system Laser diode Collimator Barcode Wide-angle condensing lens High detection resolution 光学探知システム

项目摘要

In these research periods, we investigated high detection resolution for a two-dimensional bar-code detection system (2-D BCDS) with time-sharing laser light emission method, which is essential to make it fit for practical use. Abstracts of the results are as follows.(1) Development of a masked collimatorA masked collimator system has been newly developed for the 2-D BCDS to improve barcode detection resolution in a 10-cm detection range from 0.4mm to 0.25mm. This system provides high detection resolution while remaining small system size and inexpensive. Detection range for a 3-line 0.25-mm barcode was expanded from 4cm in conventional systems to 10cm in the new system, using masks with a 3-mm hole diameter. The effectiveness of the masked collimator was confirmed from the result.(2) Study on long detection range due to optimization of an optical systemWe found out that an unbalanced masked collimator system using mask collimators with different hole diameters for three laser diodes i … More s effective for achieving the deepest depth of focus. The detection range using this mask system was expanded to 12.5cm from the maximum of 10.3cm for conventional collimator systems.(3) Development of a wide-aperture condensing lensA wide-angle condensing lens with a 40-mm aperture and a 28.5-mm focal length has been developed to improve the reliability of detection system. The result showed that its detection range was extended to 14.2cm. We also designed a new geometric optical scheme for images of the incident window of light and made the reason for the detection range extension clear.(4) Study on significant difference between a wide-angle condensing lens and a normal wide-aperture lens with long focal lengthWe fabricated a detection lens system using a wide aperture lens with a 50-mm long focal length and compared its optical characteristics with that in the wide-angle condensing lens with the short focal length. The result showed that the latter was superior to the normal wide-aperture lens because its detection sensitivity does not decrease, different from the former. Less

在这些研究期间，我们研究了具有分时激光发射方法的二维条形码检测系统（2-D BCDS）的高检测分辨率，这是使其适合于实际应用的必要条件。结果摘要如下。(1)掩模准直器的开发新开发了一种用于2-D BCDS的掩模准直器系统，以提高10 cm检测范围（从0.4 mm到0.25 mm）内的条形码检测分辨率。该系统提供了高的检测分辨率，同时保持小的系统尺寸和廉价。3线0.25毫米条形码的检测范围从传统系统的4厘米扩大到新系统的10厘米，使用3毫米孔径的掩模。结果证实了屏蔽准直器的有效性。(2)光学系统优化实现大探测距离的研究我们发现，采用不同孔径的掩膜准直器，对三个半导体激光器构成的非平衡掩膜准直器系统， ...更多信息这对于实现最深的聚焦深度是有效的。使用该掩模系统的检测范围从常规准直器系统的最大10.3cm扩展到12.5cm。(3)为了提高探测系统的可靠性，研制了一种孔径为40 mm、焦距为28.5 mm的广角聚光透镜。实验结果表明，该传感器的探测距离可达14.2cm。设计了一种新的几何光学方案，对入射光窗口的成像进行了分析，明确了探测范围扩展的原因。(4)广角聚光透镜与普通长焦距大口径透镜的显著差异研究我们采用长焦距50 mm的大口径透镜制作了探测透镜系统，并与短焦距广角聚光透镜的光学特性进行了比较。结果表明，与普通大口径透镜相比，后者的探测灵敏度没有降低，具有上级的优点。少