SMART CIVIL INFRASTRUCTURE MONITORING

Project Client/Facility Advisor: Randall Geiger

Project Team: Team Leader: Xianbo Tao Communicator: Kun Zhang Website Leader: Guoyan Kai

PROJECT GOAL

Design circuit for small changes in capacitors

Analyze system reliability

Lower cost demand

Test the system stability to environment

CONCEPT DIAGRAM

FUNCTIONAL DECOMPOSITION

Overall Function

A monitoring system to inspect potential problems of bridges.

CONCEPT DIAGRAM

TRANSMITTER

FUNCTIONAL DECOMPOSITION

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

DETAILS SYSTEM DESIGN Capacitor Sensor

Purpose: to build a circuit can detect which part of the

bridge crack.

DETAILS SYSTEM DESIGN

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

DETAILS SYSTEM DESIGN

System Controller

Transfer Analog signal to Digital signal to get data.

TEST REQUIREMENT

The switch capacitor is much smaller than soft capacitor

Voltage input is AC

The number of the bit resolution for ADC

PROJECT STATUS

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.

QUESTIONS ?