Remote Stable Isotopic Analysis using Laser-induced breakdown UV spectroscopy and Reflective Spatial Homodyne Spectroscopy (SHS)

F. Vasefi
SafetySpect Inc., California, United States

Keywords: Laser-induced breakdown spectroscopy, spatial Homodyne spectroscopy, stable isotope ratio, explosive, forensic

Recent developments in lasers, spectrometers, and fast detectors during last two decades make Laser-induced breakdown spectroscopy (LIBS) a mature technique with a range of applications such as planetary and deep-sea exploration, material sorting, stable isotope ratio analysis of atoms and molecules for remote detection of explosive materials [1] as well as for the forensic analysis of military small arms projectiles [2]. We propose a new ultra-resolution spectroscopy technology for stand-off Stable Isotopic Analysis (SIA) using Laser-induced breakdown UV spectroscopy, performing an order of magnitude better than current SIA approaches for each of the most important/relevant features: sensitivity, resolution, stand-off detection distance, size and cost. We intend to show the feasibility of our device for detection of carbon stable isotopes by developing the first prototype and complete system performance model and characterization. Our spectroscopy system uses Fourier transform-based high-resolution (down to 0.01 Å) spectra. This spectrometer, primarily developed in JPL for space applications, consists of three sections: input optics, SHS interferometer, and the fringe imaging optics coupled to the FPA (See Figure 1) [3]. Its high optical throughput (up to 35%) and wide field of view (