The Research For Monitoring Three-Dimensional Underground Displacement Based On Integrated Sensor And Measuring Method

In recent years, natural disasters happened frequently, which arouseenormous hazards to human beings. Therefore, detecting and prevention for naturaldisasters is becoming more and more important. As natural disasters are highlycorresponding to underground displacement, detecting this phenomenon in a realtime way is an effective method to make early warning.Nowadays, people use TDR coaxial, drilling inclinometer，extensometer andsettlement gauge to detect the underground deformation. However, each method aspresented has its own shortcoming. Thus, we explore and research a newunderground displacement sensor, which could not only achieve a real-timemeasurement, but also detect the direction of underground displacement.This thesis can be summarized into four parts: firstly, researching undergrounddisplacement sensor based on mutual inductance, magnetic and inductive principle,determining the sensor’s coil parameters by experiments, and designing installationplan according to the actual requirements; secondly, designing the hardware circuitfor sensor, selecting every module’s components and introducing the function ofeach module; thirdly, introducing IIC interface bus, designing MMC212xMG,MMA8451driver program, MSP430main program, PC program, and introducingthe function of PC program; fourthly, doing calibration of the elastic line,introducing production and installation of the elastic line, analyzing the error of theexperimental data and compensating the error with an effective way.This project had finished the research for underground displacement sensor, andachieves a good result, which lay a solid foundation for further study.