Fig. 1. Schematic of stray radiation and stop aperture of uncooled infrared detector

Fig. 2. “Pot cover effect” caused by stray radiation of uncooled infrared detector

Fig. 3. Transmission of radiation energy between two surfaces

Fig. 4. Spatial rectangular coordinate system for calculation of stray radiation transmission path

Fig. 5. Stray radiation emissive region model

Fig. 6. Variable elements for describing stop aperture shape

Fig. 7. Flow chart for optimizing stop aperture shape by interval exhaustion method

Fig. 8. Dimensions (unit:mm). (a) Radiant surface of case; (b) plane of front baffle

Fig. 9. Stop aperture shape after optimization

Fig. 10. Distribution of stray irradiance along diagonal line of FPA. (a) Without stop; (b) with stop

Fig. 11. Distribution of stray irradiance on FPA. (a) Without stop; (b) with stop