Fig. 1. Wien's law diagram

Fig. 2. Atmospheric transmission spectrum

Fig. 3. Comparison test chart of lighter after ignition. (a) Medium wave; (b) Long wave

Fig. 4. Solar radiation spectrum

Fig. 5. Contrastive test chart of the imaging of the sun, clouds and sea surface by medium and long wave thermal imaging instrument. (a) Medium wave; (b) Long wave

Fig. 6. Comparison effect diagram of interference bomb test at medium and long wave. (a) Medium wave; (b) Long wave

Fig. 7. (a) Effect of observing the cross target in the static state of the medium wave thermal imaging instrument; (b) Effect of observing the cross target in the static state of the long wave thermal imaging instrument; (c) Effect of observing the cross target under the rotation of the medium wave thermal imaging instrument; (d) Effect of observing the cross target under the rotation of the long wave thermal imaging instrument

Fig. 8. (a) Imaging rendering of the medium wave thermal imaging instrument in the static state; (b) Imaging rendering of high-speed, high-dynamic state medium wave thermal imaging instrumen；(c) Imaging rendering of the long wave thermal imaging instrument in the static state; (d) Imaging renderingof high-speed, high-dynamic state long wave thermal imaging instrument

Fig. 9. Different material windows under test (From left to right: Spinel, Zinc sulfide, Zirconia, Yttrium oxide)

Fig. 10. Transmission verification test block diagram

Table 1. Thermal imaging effect of the medium wave window in various temperature environments

Table 2. Thermal imaging effect of the long wave window in various temperature environments

Table 3. Attenuation of window transmittance at different temperatures