Mr. Moedji Soedjarwo Profile

Moedji Soedjarwo

at Indonesian National Institute of Aeronautics and Space

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Proceedings Article | 10 October 2020 Presentation + Paper

The use of dual band anti-reflection (AR) black coatings in reducing stray light effect on IR camera system sharing aperture

Bustanul Arifin, Irwan Priyanto, Moedji Soedjarwo, Andi Mukhtar Tahir

Proceedings Volume 11548, 1154807 (2020) https://doi.org/10.1117/12.2585612

KEYWORDS: Infrared cameras, Stray light, Cameras, Infrared imaging, Imaging systems, Optical coatings, Infrared coatings, Thermography, Sensors, Sensor performance

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This paper presents the use of dual band anti-reflection (AR) black coatings in reducing stray light effect on Infra Red (IR) camera system sharing aperture. This MWIR and LWIR bands analyses basically deal with the fabricator's perspective, either from the optical or thermal views. Using Thermal Desktop / Sinda Fluint the all processes finally are enclosed. Intending to provide the best black coating that meet all requirements, the first trade-off was involving absorbtivity / low reflectance, low outgassing, low cost, and easy to bond on all substrates as the requirements. Meanwhile, high efficiency, durability (space environment including humidity), and transmission were used as the requisites in the second trade-off process. Moving forward to next step, determining in term of single or dual band was become the concern based on the final result of the second trade analysis. The processes, then, was enclosed using Thermal Desktop / Sinda Fluint to show up the behavior of selected coating material in orbit. Throughout the all analysis, all current AR coatings for infrared were involved in including a new black coating material, acktar. In addition, lens material used was according to our published research previously. According to the whole process, the results of 3 - 4 µm and 8 - 12 µm bands, graphs and tables (numerical data), show that acktar material usage as optical dual band AR black coatings of LAPAN's IR camera equipped with two microbolometer is very useful to reduce stray light effect. Meanwhile in term of performance, It can be said that it provides high performance of both sensor bands. As this is not only focused on making certain existing surface black, the further analysis is still needed to strengthen the output.

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