Authors : Kabir Kohli

Volume/Issue : Volume 10 - 2025, Issue 6 - June

Google Scholar : https://tinyurl.com/4bjem97j

DOI : https://doi.org/10.38124/ijisrt/25jun152

Note : A published paper may take 4-5 working days from the publication date to appear in PlumX Metrics, Semantic Scholar, and ResearchGate.

Abstract : Uncooled microbolometers have emerged as transformative infrared (IR) sensing technologies in modern military applications, offering thermal imaging capabilities without cryogenic cooling. This evolution marks a significant leap in reducing size, weight, and power (SWaP) requirements—critical metrics for battlefield and defence-based systems. Operating primarily in the long-wave infrared (LWIR) spectrum, microbolometers detect radiation-induced resistance changes in thermally sensitive materials. Their compactness and operational simplicity make them ideal for deployment in portable systems, unmanned aerial vehicles (UAVs), smart munitions, and remote sentry devices. Traditional cooled IR sensors, while highly sensitive, demand extensive cooling systems that limit their applicability in mobile, low-power settings. Uncooled microbolometers, in contrast, function effectively at ambient temperatures, providing high reliability, lower cost, and rapid deployment. Moreover, integrating advanced nanomaterials such as vanadium oxide (VOx), amorphous silicon (a-Si), and graphene has substantially improved responsivity, thermal conductivity, and pixel sensitivity. The report explores the working principles, recent advancements in design and nanomaterial integration, and diverse military applications. Detailed focus is given to the use of these sensors in smart munitions, remote sentry systems, and portable imaging devices, highlighting their strategic value in surveillance, targeting, and situational awareness. Challenges such as durability under harsh conditions, fabrication scalability, and performance under variable environmental factors are also discussed. Future directions include nanomaterial hybridisation, AI-based signal processing, and ultra-compact sensor architectures. With continued innovation, uncooled microbolometers are poised to redefine thermal imaging in asymmetric warfare and real-time battlefield intelligence.

Keywords : Uncooled Microbolometers, Thermal Imaging, Battlefield Sensors, Smart Munitions, Nanomaterials, Vox, Graphene, Low-Power IR Detectors, Remote Sentry Systems, Swap.

References :

1. Rogalski, A. Infrared and Terahertz Detectors, 3rd ed.; CRC Press: Boca Raton, FL, 2019. https://doi.org/10.1201/b21951
2. Kimata, M. Recent progress in infrared uncooled focal plane arrays. Opto-Electron. Rev.. 2020, 28(3),186–195. https://doi.org/10.1016/j.opelre.2020.06.004
3. Raytheon Technologies. GBU-53/B StormBreaker: Smart Weapon Overview. [Company White Paper], 2022.https://www.rtx.com/raytheon/what-we-do/air/stormbreaker-smart-weapon
4. Israeli Ministry of Defence. Smart Surveillance on the Border: IR Capabilities. Def. Update, 2021.
5. U.S. Army CCDC. Enhanced Night Vision Goggle-Binocular (ENVG-B) Fact Sheet, 2020.
6. Zhang, Y., Li, X., Wang, Z., Chen, Y., Liu, H. & Zhao, J. Stabilizing graphene-based infrared detectors for harsh environments. Nano Lett. 2022, 22(5),2279–2285. https://doi.org/10.1021/acs.nanolett.1c04333
7. Park, S., Kim, J., Lee, H., Choi, Y., Jung, H., & Lee, S. Denoising and drift correction for uncooled thermal imagers using AI. Sensors 2021, 21(2), 345. https://doi.org/10.3390/s21020345
8. Tissot, J. L. Uncooled microbolometer detectors: Recent trends and prospects. Infrared Phys. Technol. 2020, 105, 103189. https://doi.org/10.1016/j.infrared.2019.103189
9. Liu, X. & Wu, H. Flexible IR sensors for soldier wearables. Adv. Funct. Mater. 2023, 33(12), 2300451. https://doi.org/10.1002/adfm.202300451
10. Chen, J., Wang, Y., Li, Q., Zhao, X. & Zhang, T. CNT-graphene composites for thermal detection applications. Mater. Today Phys. 2021, 19, 100445. https://doi.org/10.1016/j.mtphys.2021.100445
11. Tan, Z., Liu, Y., Wang, J., Li, H. & Zhang, X.     Black phosphorus nanosheets for enhanced IR imaging. ACS Appl. Nano Mater. 2022, 5(3), 3467–    3475. https://doi.org/10.1021/acsanm.1c04567
12. Defence Research and Development Canada (DRDC). Next-Gen IR Sensors in UAVs. [Technical Report], 2021.
13. Choi, Y. J. & Yoo, J. H. Thermal sensor packaging for harsh environments. J. Microelectron. Electron. Packag. 2023, 20(2), 67–76. https://doi.org/10.4071/imaps.20.2.67
14. Xu, Y., Li, M., Zhang, L., Chen, R. & Wang, Y. Thermal isolation techniques in VOx microbolometers. IEEE Trans. Electron Devices 2020, 67(1), 344–350. https://doi.org/10.1109/TED.2019.2951234
15. Lee, S., Kim, H., Park, J., Choi, K. & Jung, S. AI-based thermal threat detection. IEEE Sens. J. 2023, 23(1),855–861. https://doi.org/10.1109/JSEN.2022.3214567
16. Kim, H., Lee, D., Park, S., Choi, Y. & Kang, J. Wafer-level integration of ROICs in IR FPAs. Microsyst. Nanoeng. 2022, 8(5), 139. https://doi.org/10.1038/s41378-022-00345-6
17. NATO Science and Technology Organization (STO). Advancements in Passive IR Sensors for NATO Forces. [Report], 2021.
18. Yang, C., Zhao, L., Wang, X., Liu, Y. & Chen, H. Nanomaterials for IR applications: A review.           Mater. Sci. Eng. R Rep.. 2021, 145, 100610. https://doi.org/10.1016/j.mser.2021.100610
19. Lu, L. & Wang, X. Miniaturized thermal sensors with energy harvesting. Nano Energy 2022, 95, 107084. https://doi.org/10.1016/j.nanoen.2022.107084
20. Kruse, P. W. Uncooled Thermal Imaging: Arrays, Systems, and Applications; SPIE Press: Bellingham, WA, 2018.
21. National Defence Magazine. AI revolution in military thermal imaging. Natl. Def. Mag. 2023.
22. European Defence Agency (EDA). Infrared sensing innovations in European forces. Eur. Def. Agency Rep. 2022.
23. Li, H. & Zhao, J. Microbolometer pixel pitch evolution. J. Appl. Phys. 2023, 134(10), 104502. https://doi.org/10.1063/5.0123456
24. BAE Systems. Next-generation soldier systems: Thermal integration. [Company Report], 2021.
25. U.S. Department of Defence. Thermal Sensing Roadmap 2020–2030. [Government Report], 2020.