[Remote passive sensing of aeroengine exhausts using FTIR system]

Area of Science:

• Spectroscopy
• Environmental monitoring
• Aerospace engineering

Context:

• Traditional intrusive gas sampling for aeroengine exhausts presents challenges including complexity, cost, and safety risks.
• Non-intrusive methods are sought to overcome the limitations of traditional techniques.
• Remote Fourier-transform infrared (FTIR) passive sensing emerges as a viable non-intrusive approach.

Purpose:

• To apply remote FTIR passive sensing for monitoring aeroengine exhausts.
• To determine the concentrations of exhaust gases like CO2, CO, and NO.
• To evaluate the feasibility and potential of FTIR sensing in this application.

Summary:

• The study discusses the principle of remote FTIR passive sensing and introduces a model algorithm for system calibration, radiance power distribution, and gas concentration determination.
• A TENSOR27 FTIR system was utilized to measure emission spectra of hot aeroengine exhaust gases under various thrust levels in a test rig.
• Analysis of the obtained spectra allowed for the calculation of CO2, CO, and NO concentrations at four different thrust levels.

Impact:

• This research presents the first published results on aeroengine exhaust spectra and gas concentration determination using remote FTIR sensing in the domestic aeronautics field.
• The findings indicate that remote FTIR passive sensing techniques hold significant potential for monitoring hot gas emissions from aeroengines.
• This non-intrusive method offers a promising future for efficient and safe aeroengine exhaust analysis.