激光投射式位移传感技术在桥梁挠度检测中的应用研究

Application Study on Laser Projection Sensor for Bridge Deflection Detection

激光投射式位移传感技术是精确测量桥梁挠度变化的一种有效方法。在介绍现有各种桥梁挠度测量方法的基础上,分析了激光投射式位移传感技术的基本原理和存在的问题,提出了改进措施。实桥测试结果表明,相对精密水准仪的测量效果,改进后的激光投射式挠度传感器在实际桥梁,尤其是高落差、大跨度桥梁的挠度测量中,具有操作方便、测量速度快、测量精度高等优势。该套传感器已成功应用于渝黔高速公路河耳沟大桥的桥梁远程健康监测中。

Laser projection deflection sensing technology is analyzed and studied delicately. Some improvements on laser source and target are proposed and set in the instrument. To verify the effect of the improvements, a practical bridge experiment in He＇ergou bridge with the technology is designed. The measurement results of laser projection method are compared with those of water level deflection instrument. The experiment shows the first one is better in operation and accuracy, especially for those high-fall and long-span bridges.