Mr. XinLong Xie Profile

XinLong Xie

at Soochow Univ

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Proceedings Article | 21 March 2023 Paper

Optimize design of thermal infrared reflective baffle

Xinlong Xie, Jiacheng Zhu, Zhicheng Zhao, Weimin Shen

Proceedings Volume 12595, 125950L (2023) https://doi.org/10.1117/12.2667069

KEYWORDS: Baffles, Design and modelling, Reflectivity, Infrared radiation, Stray light, Manufacturing

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Baffle is the primary instrument for suppressing stray radiation outside of the field of view of optical system. Infrared optical systems detect thermal radiation from objects, which can be severely affected by the stray thermal radiation. The reflectivity of the vane of the reflective baffle is so high that it can reduce the stray radiation entering the optical system, and its own radiation is small, which meets the requirements of stray radiation suppression of thermal infrared optical systems. The Stavroudis baffle is the reflective baffle with ellipse and hyperboloid vane, which has a stable structure and great capability of suppression of stray thermal radiation. But its volume will increase sharply with the increase of the field of view of the optical system. In addition, the special shape of the baffle increases the difficulty of design and processing. This paper proposes an optimize design about conical reflective baffle, which can quickly and accurately design the baffle. The volume of optimized baffle is reduced by 25% compared with the baffle designed by the original method. In order to illustrate the performance of optimized baffle, comparing with the baffle with straight vane and unoptimized baffle, we simulate the stray radiation of Three Mirror Anastigmat (TMA) with optimized baffle. The simulation results show that the Point Source Transmittance (PST) of the optimized baffle is 1×10-7 when the off-axis angle is more than 60 degrees, which is lower than the other two baffles. Finally, we propose a high-efficiency and low-cost processing method for this baffle, and the mass of baffle is within 300g. The design and processing method of the reflective baffle proposed in this paper can complete the manufacture with high efficiency and low cost, which provides technical support for infrared optical systems.

Proceedings Article | 15 February 2022 Paper

Internal stray radiation analysis of uncooled thermal infrared imaging spectrometer

Xinlong Xie, Xinhua Chen, Jiacheng Zhu, Weimin Shen

Proceedings Volume 12166, 121666M (2022) https://doi.org/10.1117/12.2617869

KEYWORDS: Spectroscopy, Infrared imaging, Infrared spectroscopy, Infrared radiation

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The cooled thermal infrared imaging spectrometer use blacken surface to absorb the stray radiation of outside the field of view and reduces the thermal radiation by decreasing the temperature. Though the system performance is high, it has problems such as high cost, large power consumption, large volume, and low reliability. The uncooled thermal infrared imaging spectrometer, which has the advantages of small size, low cost and long lifetime, has great potential to monitor high temperature targets such as forest fires, but the high emissivity of blacken surface will become a huge thermal radiation source, which will affect the imaging performance seriously .Its application and development are constrained by the disadvantages such as low signal to noise ratio, high infrared stray radiation and so on. In this paper, we present an uncooled long-wave infrared imaging spectrometer working between 3μm and 14μm. The system is composed of three components, including baffle, foreoptics and spectrometer. We adopt two different mechanical surface processing methods, i.e. the black nickel coating method and the surface polishing method. Then we analyzed the influence of the two methods on the internal thermal radiation at 300K, and compared two methods with the analysis results of the blacken method. We find that the radiation of the black nickel coated surface can reduce stray radiation by 20%, while the polished surface can reduce stray radiation by 50%. According to the analysis results, we can find that the polished surface method has better radiation suppression performance than the black nickel coating method for the designed uncooled thermal infrared imaging spectrometer.

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