Fig. 1. Transmission path of exhaust plume infrared radiation

Fig. 2. Simulation calculation flow of exhaust plume infrared radiation intensity based on ray tracing

Fig. 3. Simulation calculation result of exhaust plume temperature field

Fig. 4. Geometric relationship of air-based detection scene

Fig. 5. Line of sight detection angle and detection range

Fig. 6. Variation curve of radiation attenuation characteristics of particle with complex refractive index. (a) Variation curve of the scattering cross section with the real part of the complex refractive index; (b) variation curve of the absorption cross section with the imaginary part of the complex refractive index

Fig. 7. Variation curve of particle extinction cross section with particle diameter

Fig. 8. Variation curve of particle scattering characteristics with particle diameter. (a) Variation curve of asymmetry factor with particle diameter; (b) variation of scattering phase function with asymmetry factor

Fig. 9. Infrared radiation suppression rate with different particle diameters. (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 10. Infrared simulation images of exhaust plumes with different particle diameters. (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 11. Infrared radiation suppression rate of different particle flow rates (diameter is 3 μm). (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 12. Infrared radiation suppression rate of different particle flow rates (diameter is 10 μm). (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 13. Infrared simulation images of exhaust plumes with different particle flow rates (diameter is 3 μm). (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 14. Infrared simulation images of exhaust plumes with different particle flow rates (diameter is 10 μm). (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 15. Infrared radiation suppression rate with different particle complex refractive indexes (diameter is 3 μm). (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 16. Infrared radiation suppression rate with different particle complex refractive indexes (diameter is 10 μm). (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 17. Infrared simulation images of exhaust plumes with different particle complex refractive indexes (diameter is 3 μm). (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 18. Infrared simulation images of exhaust plumes with different particle complex refractive indexes (diameter is 10 μm). (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 19. Spectral radiation intensity with different particle complex refractive indexes (diameter is 3 μm). (a) Short waveband; (b) medium waveband; (c) long waveband

Fig. 20. Spectral radiation intensity with different particle complex refractive indexes (diameter is 10 μm). (a) Short waveband; (b) medium waveband; (c) long waveband