Infrared imaging systems are widely used on the battlefield. As the operational environment becomes increasingly complex, laser interference weapons pose a serious threat to infrared imaging systems. During the imaging process, infrared imaging systems are susceptible to laser interference, resulting in laser dazzle and loss of target detection ability. High laser power can also cause bad pixels to appear. This paper proposes four laser protection technologies from the perspective of reinforcing the infrared imaging system, combined with experiments, to address the 3.8μm mid-wave band laser interference faced by photovoltaic HgCdTe detectors. These technologies include: 1. Integration time adjustment technology, which reduces the area of the interference light spot by adjusting the integration time; 2. Imaging field adjustment technology, which reduces the convergence of laser energy and the optical system's gain by changing the instantaneous field of view size; 3. Spectral imaging technology, which filters out narrow-band laser energy; 4. Wavefront coding technology, which uses wavefront coding plates to disperse laser energy, then restores the image to achieve anti-interference effects.
In high speed flight, the aero-optical effect greatly affects infrared imaging system. An experiment investigating heating window radiance was conducted based the fluid computational simulation results. The paper gave the facilities needed and the procedures for experiment performance. The experiment data was analyzed by means of target signature evaluation principle, target contrast, SNR, gray level correlation index and gradient correlation index was computed from 4-bars infrared image. The results showed that the image region of interest was greatly affected by the heating window radiation. And some pre-processing skills should be introduced before implementing the target recognition and tracking algorithms. It is meaningful for validating performance of infrared imaging system with non-cooling window and to development methods of suppressing the hot dome radiation to reduce the image degradation.
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