In order to overcome disadvantage of unstable performance and high cost in the system of the existing aircraft engine off gas monitoring system. The ECT-based aero-engine off gas acquisition system is designed which realize collection of senor design

data acquisition and image processing in the integration of the functional system design. The system includes three modules: multi-electrode capacitive sensor module

data acquisition system module and computer imaging module. Summarize design thought of each module

and discuss design method and control process of acquisition system module which is the core module in detail. Simulation experiment shows that this system has features of stable performance

non-invasive and good real-time.