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Proceedings Paper

Study on image jamming effect of infrared imaging system induced by CO2 laser
Author(s): Jinxi Che; Dong Wang; Hengwei Zhang; Leilei Zhang; Lei Zhang; Zejun Dong
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Paper Abstract

In order to study the saturation threshold and the image jamming effect of wavelength, energy or power, frequency and size of laser spot, the laser saturation jamming experiments by means of diffuseness are developed, in which, CO2 tunable pulse laser and CO2 continuous wave(CW) laser separately interfere HgCdTe 288×4 cooled scanning IR imaging system and microbolometer poly-Si 320×240 Uncooled Focal Plane Array(UFPA) staring IR imaging system. The jamming effect is reflected through the output-images of the IR imaging system. Therefore, when the experiments were developing, with the minishing of the laser beam attenuation, the energy or power density of the laser was augmented. Simultaneously, with the density of laser spot changing, the changes of output-images had also taken place. The output-images of the IR imaging system were also observed, collected and saved. Moreover, by adjusting the laser's energy density, the saturation threshold was tested. Furthermore, by adjusting the laser's energy or power density, wavelength, frequency and size of laser spot, the image jamming effect of IR imaging system induced by CO2 laser was studied. In the experiments of the size of laser spot's to jamming effect, on the premise of the laser energy being invariable, with the laser spot enlarging, on the contribution to jamming effect, the added interfered image elements compensate the loss to jamming effect due to energy descending and exceed it. In the experiments of the frequency to jamming effect, when the jamming laser works with higher repeating frequency, after the interference is stopped, the resume time of IR imaging system is more than it of laser working with monopulse interference. Within settled time, much impulses engender accumulation of energy in detector, which correspond to improving the laser's intensity at the jamming effect angle. So, the jamming effect of IR image system is rightly proportional to intensity of interference laser. And improving jamming laser's frequency is propitious to jamming effect of IR image system. In the experiments of CO2 tunable pulse laser interfering HgCdTe 288×4 cooled scanning IR imaging system, the jamming effect of pulse laser is unconspicuous. On the contrary, the CW laser's jamming effect is conspicuous. This also have something to do with the responding wave band of IR imaging system. The all results are analyzed through analyzing the jamming images, and they show that the jamming effects are improved with energy, frequency, wavelength and size of laser spot increasing. Otherwise, the jamming effect proves that the jamming means of diffuseness is feasible.

Paper Details

Date Published: 8 September 2011
PDF: 8 pages
Proc. SPIE 8193, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, 81930F (8 September 2011); doi: 10.1117/12.897366
Show Author Affiliations
Jinxi Che, People's Liberation Army (China)
Dong Wang, People's Liberation Army (China)
Hengwei Zhang, People's Liberation Army (China)
Leilei Zhang, People's Liberation Army (China)
Lei Zhang, People's Liberation Army (China)
Zejun Dong, People's Liberation Army (China)


Published in SPIE Proceedings Vol. 8193:
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications
Jeffery J. Puschell; Junhao Chu; Haimei Gong; Jin Lu, Editor(s)

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