Design Of Laser Deflection Monitoring Data Acquisition And Display Terminal

With the rapid development of economy,large bridges play an increasingly important role in people's social life.However,in the course of operation,these large bridges will produce small deformation,when the deformation exceeds its own range,it will occur bridge failure and other disasters,endangering human life and property safety.Bridge deflection is an important indicator to measure the safety of bridge structures.Therefore,it is imperative to monitor the deflection of bridges.In this thesis,the laser deflection monitoring data acquisition and display terminal design,anti-interference ability,the bridge deflection signal can be real-time acquisition,processing,display,storage and query.In this thesis,the laser deflection monitoring data acquisition and display terminal design,mainly completed the hardware design and software design in two parts.The hardware design mainly includes the design of the laser spot measuring device and the hardware circuit of the data acquisition and transmission module,the laser spot measuring device hardware design includes the laser transmitter and the laser receiver,the laser receiver is composed of a magnification mirror and a photosensitive circuit board,and the silicon photodiode on the photosensitive circuit board converts the optical signal irradiated on the optical signal into an electrical signal Output.Data acquisition and transmission module hardware design mainly introduces the resource chart of STM32F103C8T6+ESP8266 development board,the main function of the development board is to collect and transmit the output signal of the laser spot measuring device.Through the introduction of this part,you can accurately obtain the bridge deflection of the analog value.The software design includes the design of data acquisition and transmission modules and display terminals.Data acquisition module software design is mainly to initialize the internal AD of the STM32 microcontroller,and through the AT command to debug ESP8266 WiFi module to achieve data transmission,data transmission module is introduced from the development board work in STA mode and AP mode.The Display terminal including Android display terminal and web display terminal in two parts,Android display terminal implementation requires skilled use of Eclipse for Android program development,the use of SurfaceView class on the laser deflection monitoring signal waveforms,and use the SQLite database for storage and query.Web page display terminal implementation needs to apply the server,the use of PHP language,HTML language and JavaScript language to complete the design of the home page and the realization of the laser deflection monitoring signal dynamic display.Finally,the scheme is tested,the two signal generated by the internal signal source and external laser spot measurement device are collected and transmitted,and the use of Android terminals and web terminals on the signal real-time display and storage,which verifying the feasibility of the program.The proposed scheme is of great significance and value to monitor the health structure of bridges.