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Aircraft accident due to fuel tank system explosion is a vital factor of the performance and reliability of aircraft. Therefore, The fuel tank of the plane inerting system is developed in the last decade, which is aim to reduce oxygen concentration by inflating nitrogen. However, if there is no oxygen concentration sensor, we don't know when to update the nitrogen in the gas separation machine. To development of a smart oxygen concentration sensor fit the environment of the aircraft fuel tank we applied the tunable diode laser absorption spectroscopy(TDLAS)and Fabry-Perot technique. TDLAS could In-situ, continuous, on-line measure, Fabry-Perot could compensate temperature and pressure for TDLAS. In this paper, we established smart oxygen concentration sensor based on SIMULINK, which is a commonly used MATLAB numerical simulation module, and the simulation experiments with the measurement of oxygen concentration was achieved; we compared the effects of different temperatures and pressures for the smart sensor, and proof the necessity of Fabry-Perot temperature-pressure integrated sensor. The experimental results showed that the smart oxygen concentration sensor could accurately measure the oxygen concentration on different temperature and pressure, and could adapt to the high temperature and high pressure environment of the fuel tank. What’s more, the results could provide experimental basis of the research and development of TDLAS-based aircraft equipment.
Inspec keywords: condition monitoring; chemical variables measurement; semiconductor lasers; gas sensors; aerospace simulation; aircraft; pressure measurement; temperature measurement; temperature sensors; numerical analysis; Matlab; computerised instrumentation; light absorption; optical sensors; pressure sensors; intelligent sensors
Subjects: Aerospace engineering computing; Chemical sensors; Intelligent sensors; Pressure measurement; Thermal variables measurement; Computerised instrumentation; Computerised instrumentation; Pressure and vacuum measurement; Lasing action in semiconductors; Numerical approximation and analysis; Aerospace testing and simulation; Optical propagation, transmission and absorption; Chemical sensors; Semiconductor lasers; Thermometry; Other numerical methods; Chemical variables measurement; Other numerical methods