1. S MART C IVIL I NFRASTRUCTURE M ONITORING Project Client/Facility Advisor: Randall Geiger Project Team: Team Leader: Xianbo Tao Communicator: Kun Zhang Website Leader: Guoyan Kai

2. P ROJECT G OAL Design circuit for small changes in capacitors Analyze system reliability Lower cost demand Test the system stability to environment

3. C ONCEPT D IAGRAM

4. F UNCTIONAL D ECOMPOSITION Overall Function A monitoring system to inspect potential problems of bridges.

5. C ONCEPT D IAGRAM

6. T RANSMITTER

7. F UNCTIONAL D ECOMPOSITION Sub-functions 1. Accurate Data Measurement Accuracy should be 0.01pF 2. Reliable Network Be able to send data to the user constantly 3. WEB-accessible database Store stress data 4. Environment Resistance Sufficient defense to work in an urban and rural environment A wide range of temperature and moisture changes

8. D ETAILS SYSTEM DESIGN Capacitor Sensor Purpose: to build a circuit can detect which part of the bridge crack.

9. D ETAILS S YSTEM D ESIGN Capacitor Sensor 3 stages: 1: switch 1 and switch 2 both open 2: switch 1 closed, switch 2 open 3: switch 2 closed, switch 1 open

10. D ETAILS S YSTEM D ESIGN System Controller Transfer Analog signal to Digital signal to get data.

11. T EST R EQUIREMENT The switch capacitor is much smaller than soft capacitor Voltage input is AC The number of the bit resolution for ADC

12. P ROJECT S TATUS So far, we are in the stage of designing and building the capacitive sensors. Also, we have already touched few parts of the system controller, which is about A/D converter and microcontroller.

13. Q UESTIONS ?