Design optimization of Cassegrain telescope for remote explosive trace detection

Kaushalkumar Bhavsar; K. E. Eseller; Radhakrishna Prabhu

doi:10.1117/12.2277932

5 October 2017 Design optimization of Cassegrain telescope for remote explosive trace detection

Kaushalkumar Bhavsar, K. E. Eseller, Radhakrishna Prabhu

Proceedings Volume 10441, Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies; 1044103 (2017) https://doi.org/10.1117/12.2277932
Event: SPIE Security + Defence, 2017, Warsaw, Poland

Abstract

The past three years have seen a global increase in explosive-based terror attacks. The widespread use of improvised explosives and anti-personnel landmines have caused thousands of civilian casualties across the world. Current scenario of globalized civilization threat from terror drives the need to improve the performance and capabilities of standoff explosive trace detection devices to be able to anticipate the threat from a safe distance to prevent explosions and save human lives. In recent years, laser-induced breakdown spectroscopy (LIBS) is an emerging approach for material or elemental investigations. All the principle elements on the surface are detectable in a single measurement using LIBS and hence, a standoff LIBS based method has been used to remotely detect explosive traces from several to tens of metres distance. The most important component of LIBS based standoff explosive trace detection system is the telescope which enables remote identification of chemical constituents of the explosives. However, in a compact LIBS system where Cassegrain telescope serves the purpose of laser beam delivery and light collection, need a design optimization of the telescope system. This paper reports design optimization of a Cassegrain telescope to detect explosives remotely for LIBS system. A design optimization of Schmidt corrector plate was carried out for Nd:YAG laser. Effect of different design parameters was investigated to eliminate spherical aberration in the system. Effect of different laser wavelengths on the Schmidt corrector design was also investigated for the standoff LIBS system.

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Kaushalkumar Bhavsar, K. E. Eseller, and Radhakrishna Prabhu "Design optimization of Cassegrain telescope for remote explosive trace detection", Proc. SPIE 10441, Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies, 1044103 (5 October 2017); https://doi.org/10.1117/12.2277932

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KEYWORDS

Mirrors

Telescopes

Monochromatic aberrations

Explosives

Laser induced breakdown spectroscopy

Explosives detection

Optical instrument design

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