条码位移传感器的研究与实现

发布时间：2019-05-13 12:35

【摘要】：条码定位技术为高铁轨道和路基沉降及变形等特定参数的测量,提供了一种有效的检测方案及手段。本文研制了一种条码位移传感器,由编码条码尺和对应的解码装置组合而成,既可以组装在一起进行近距离、接触式或非接触式高精度测量;又可以拆分开进行远距离、大量程非接触式高精度测量。可以方便地组建测量系统,实现这些特定参数的高精度组网自动化测量。本文在研究条码编码方案和条码识别方法及解码算法的基础上,提出多周期等间隔位移条码编解码方案,并设计出位移条码尺;以嵌入式系统ARM处理器为核心,设计位移条码采集处理解码装置,包括电路设计及制作、电子元器件的选型以及光路系统的搭建,并制作出装置样品;设计编写条码图像处理算法及位移解码算法,实现条码位移传感器的相应功能及测量指标。设计实验方案对条码位移传感器的性能进行考核评估,实验结果表明:条码位移传感器重复性精度小于1μm,稳定性小于4μm/周,准确度为±5μm,测量频率50Hz。最后,为高铁轨道和路基沉降及变形测量提出了参考性的方案。
[Abstract]:Bar code positioning technology provides an effective detection scheme and means for the measurement of specific parameters such as settlement and deformation of high-speed rail and subgrade. In this paper, a bar code displacement sensor is developed, which is composed of coded bar code ruler and corresponding decoding device, which can be assembled together for close, contact or non-contact high precision measurement. It can also be separated for long distance, a large number of non-contact high-precision measurement. It is convenient to set up a measurement system to realize the high precision automatic measurement of these specific parameters. In this paper, based on the study of bar code coding scheme, bar code recognition method and decoding algorithm, a multi-period equal interval displacement bar code coding and decoding scheme is proposed, and a displacement bar code ruler is designed. Based on the embedded system ARM processor, the displacement bar code acquisition and decoding device is designed, including the circuit design and manufacture, the selection of electronic components and the construction of optical system, and the device samples are made. The barcode image processing algorithm and displacement decoding algorithm are designed and programmed to realize the corresponding function and measurement index of barcode displacement sensor. The experimental scheme is designed to evaluate the performance of the bar code displacement sensor. The experimental results show that the repeatability accuracy of the bar code displacement sensor is less than 1 渭 m, the stability is less than 4 渭 m / cycle, the accuracy is 卤5 渭 m, and the measuring frequency is 50 Hz. Finally, a reference scheme for settlement and deformation measurement of high-speed rail and subgrade is put forward.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212

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