Hadamard patterned masks for large-aperture UV Raman spectroscopy in low volatile CWA detection applications

Fredrik Kullander; Markus Nordberg; Alexandra C. Johansson; Lars Landström

doi:10.1117/12.2666232

14 June 2023 Hadamard patterned masks for large-aperture UV Raman spectroscopy in low volatile CWA detection applications

Fredrik Kullander, Markus Nordberg, Alexandra C. Johansson, Lars Landström

Author Affiliations +

Proceedings Volume 12541, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIV; 1254103 (2023) https://doi.org/10.1117/12.2666232
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

Rapid and selective detection of persistent, highly toxic liquids, such as low volatile chemical warfare agents (CWA) continues to be a desired capability, e.g. by first responders and military personnel. An already proven general technique for detection of bulk material is Raman spectroscopy. Utilizing UV excitation wavelengths offers advantages such as separation from fluorescence, solar blindness and a high Raman cross-section. In the UV region, however, there is usually a rapid decrease in penetration depth for most liquids as the wavelength becomes shorter, generally resulting in that a smaller volume is accessible for Raman scattered photons. While this effect is a drawback in terms of signal power at the detector it may also be beneficial as interfering light from the background surface can be strongly reduced or even absent. Herein, the use of Hadamard patterned (50% transmission) masks at the entrance plane of a spectrograph are investigated for the purpose of increasing the amount of Raman scattered light onto the detector compared to slit measurements. Decoded spectra from Hadamard measurements on scenes containing hazardous material, such as low volatile CWA and simulant chemicals, are compared with slit measurements.

Conference Presentation

Citation Download Citation

Fredrik Kullander, Markus Nordberg, Alexandra C. Johansson, and Lars Landström "Hadamard patterned masks for large-aperture UV Raman spectroscopy in low volatile CWA detection applications", Proc. SPIE 12541, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIV, 1254103 (14 June 2023); https://doi.org/10.1117/12.2666232

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