光电倍增管在检测水泥浆液密度中的应用

Application of photomultiplier tube in detection of cement grout density

摘要: 为了高精度、非接触动态地检测灌浆工程中水泥浆液的密度，采用CR105型光电倍增管作为感光器件，设计了一种检测装置。该装置选用Cs-137作为光源，光电倍增管作为感光器件，196KB单片机作为微处理器，通过自行设计的模块化软件以及信号处理电路、显示打印输出电路实现对γ射线的检测、数据分析与处理。实验结果表明：该装置能够在恶劣环境下准确、快速地检测水泥浆液的密度；测量值不受浆液的流速、压力、温度、粘度和腐蚀等因素的影响；探测部分安装在高温、潮湿、高灰尘的灌浆工程施工现场仍能正常工作。

Abstract: In order to monitor the cement grout density accurately and dynamically in grouting practice, a detection instrument incorporating a CR105 photomultiplier tube as optic sensor was designed. The instrument, which took Cs-137 as light source, CR105 photomultiplier tube as photosensitive device and 196KB single chip processor as micro-processor, realized γ ray detection and data processing through the customized signal process circuit, display circuit and modularized software. The experimental results show that the instrument can successfully monitor the density of the cement grout in harsh environment. The detector of the instrument functions properly when it is installed in the hot, damp and dusty construction site. The measurement is fast and accurate.