| 光谱学与光谱分析 |
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| Passive Detection of Aeroengine Exhaust Based on Fourier Transform Infrared System |
| LI Shao-cheng1,ZUO Hong-fu2,XIA Qing2 |
1. College of Mechanical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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Abstract Since the composition and concentration of aeroengine exhaust can reflect the combustion efficiency, they can provide the basis for condition based maintenance, and also the basis for the analysis of environment pollution caused by aeroengine exhaust. So the importance of aeroengine exhaust detection is evident. Up to now, the measurement of aeroengine exhaust is based on sampling analysis which is not convenient and can’t meet the detection requirements when an aeroplane is flying-off or flying in the sky. Hence, new methods of exhaust detection must be studied. The passive measurement technology based on Fourier transform infrared spectroscopy (FTIR) was applied to the measurement of aeroengine exhaust in the present paper. At first, the principle of passive measurement based on FTIR was introduced in detail. On this basis, a model algorithm for gas concentration calculation was deduced based on the principle of infrared transmission. Then the feasibility of aeroengine exhaust measurement based on passive FTIR was analyzed, and the passive measurement method of aeroengine exhaust based on FTIR was given. In the end, an experiment of aeroengine exhaust passive measurement was carried out by a FTIR with the type of Tensor 27 produced by BRUKER. Good quality spectra of the exhaust and the background were measured. Based on the model algorithm of passive measurement, the absorbance spectra of CO and NO were obtained respectively, and the concentrations of CO and NO were figured out. To check up the veracity of this method, a comparison was made with another apparatus. There were only little differences between the results of the two experiments, showing that the passive measurement technology based on FTIR could meet the requirements of aeroengine exhaust detection.
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Received: 2007-08-06
Accepted: 2007-11-08
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Corresponding Authors:
LI Shao-cheng
E-mail: chenglishao@163.com
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