基于PIV技术的新型土壤收缩轨迹测试装置研制

A new testing device of soil shrinkage characteristics based on PIV technique

基于粒子图像测速(PIV)技术原理,研发一套可适用于室内和现场使用的土壤表面收缩轨迹测试装置。该装置的核心结构(图像采集模块)由图像采集设备(部件1)和供热设备(部件2)组成,两者之间为分离式结构;部件1连接工业相机、人工光源和试样,具有控制光照强度、调整采集区域等功能;部件2连接恒温筒,其特有的双U型玻璃结构可通过内壁热辐射向腔内提供稳定高温环境。该装置能提供PIV技术所要求的高精度、高稳定性测量环境,同时具有调控温度、直观可视化、操作简单等优势;通过对试验结果的分析,简单讨论该装置在表面动态位移场监测中的测试精度。最后,基于土壤表面的收缩轨迹特性介绍该装置所具备的应用前景。

Based on the particle image velocimetry(PIV)technique,a new testing device of soil surface dynamic displacement field which can be used in laboratory and field is developed.The core structure(image acquisition module)of the device is composed of an image acquisition unit(part 1)and a heating unit(part 2),and they are separated from each other.Part 1 is connected with an industrial camera,an artificial light source and a sample,and has the functions of controlling light intensity and adjusting acquisition area.Part 2 is connected to a constant temperature chamber,and its unique double U glass structure can provide a stable hightemperature zone in the chamber via the heat radiation of the inner wall.The device can provide the measurement environment with high precision and high stability required by PIV technique,and has the advantages of temperature control,intuitive visualization,and simple operation.According to the testing results,the measuring accuracy of the device is briefly discussed.Finally,based on the soil shrinkage characteristics,the application prospect of the device is introduced.