Ms. Wenfei Luo Profile

Wenfei Luo

at Sichuan Univ

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Proceedings Article | 2 September 2014 Paper

Influence of particle contamination on the stray radiation performance in infrared optical system

Jianpeng Wu, Jia-qi Peng, Wen-fei Luo, Bin Zhang

Proceedings Volume 9280, 92800R (2014) https://doi.org/10.1117/12.2067971

KEYWORDS: Mirrors, Particles, Infrared radiation, Infrared imaging, Scattering, Contamination, Optical components, 3D modeling, Particle contamination, Stray light

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The particle contamination on the optical components would degrade the detection performance of the infrared optical systems and even make the detection task failure for the case of the optical components seriously contamitated. With the use of ASAP optical analysis software, a typical infrared optical-mechanical three-dimensional stimulation model has been built up. The particle distributions on the surface of the optical components have been studied and the particle distribution model has also been given. Furthermore, the influence of particle contamination on the stray light radiation characteristic of the infrared optical system has been analyzed in detail. The result shows that contamination particles randomly undergo collisions and small particles are loosely attached to each other at their first contact location and finally deposited as random single-particle aggregation and cluster-cluster aggregation, resulting in an obviously affect on the stray radiation performance of the infrared optical system. Furthermore, the change of the deposition positions of the contaminants aggregation also has a certain influence on the stray light radiation characteristics. In practical applications, it seems particularly important to control strictly over the contamination of optical surface during the operation of the infrared optical system.

Proceedings Article | 2 September 2014 Paper

Influence of surface treatment of components on thermal radiation performance in infrared optical systems

Wen-fei Luo, Jian-peng Wu, Jia-qi Peng, Bin Zhang

Proceedings Volume 9280, 92800Q (2014) https://doi.org/10.1117/12.2067975

KEYWORDS: Mirrors, Scattering, Infrared radiation, Surface roughness, Infrared imaging, Sensors, Thermography, Surface finishing, 3D modeling, Contamination

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The existence of self-generated thermal radiation in infrared optical systems exhibits a great impact to the extraction of target signal and further degrades the signal-to-noise ratio (SNR), thus making the self-generated thermal radiation one of the important factors affecting the detective property. In this paper, a refraction-reflection optical system has been taken as an example and the three-dimensional simulation model has been built up using the ASAP optical analysis software. On this basis, the influence of the surface roughness, the level of the optics contaminated by the particles with the uniform and non-uniform distributions, the treatment of the mechanical surface (such as blacking, polishing, roughening) on the self-generated thermal radiation have been focused on discussion. Moreover, the thermal radiation of the system has been evaluated by the effective emissivity. The results indicate that the effective emissivity varies with different surface treatment. The self-generated thermal radiation is more and more serious with the increasing of the effective emissivity, resulting in great difficulty in obtaining and analyzing the target signal. It follows that the surface treatment of components exhibits a significant effect on the stray radiation performance in infrared optical systems. Consequently, appropriate treatments should be taken to diminish the self-generated thermal radiation in order to meet the requirements of the stray radiation performance in practical applications.

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