technologies
Innovative Detection Technologies
Implementing unique, patented laser spectroscopy techniques, LDS explosive detectors, and chemical analyzers are processing laser illumination reflected from the tested surface, employing RAMAN, UV-RAMAN, luminescence and Laser-Induced Breakdown Spectroscopy (LIBS) to identify the inspected substance. Identifying trace materials on the object in real-time, without direct contact with the suspected object.
Other chemical sensing and detection systems produced by LDS utilize Ion Mobility Spectrometry (IMS) and Wet-Chemistry techniques, all providing the most comprehensive and accurate detection and identification of explosives, narcotics, and hazardous chemicals substances.
LDS’s detection systems rely on Ion Mobility Spectroscopy (IMS) to detect trace quantities of low-volatile organic substances in extremely low concentrations, thus providing best-in-class sensitivity and probability of detection.
Other chemical sensing and detection technologies used by LDS utilize Laser Spectrometry and Wet-Chemistry techniques, all providing the most comprehensive and accurate detection and identification of explosives, narcotics, and hazardous chemicals substances.
Detection methods relying on Wet-Chemistry provide a highly reliable, and cost-effective technology based on chemical reagents that change color upon contact with a suspicious substance. LDS explosive detection testers based on wet-chemistry detect 99% of explosives on the FBI Threat List.
Other chemical sensing and detection systems produced by LDS utilize Ion Mobility Spectrometry (IMS) and Laser Spectroscopy techniques, all providing the most comprehensive and accurate detection and identification of explosives, narcotics, and hazardous chemicals substances.
LDS implements spectrum processing algorithms and various processing, data fusion and filtering methods including RAMAN, UV-RAMAN, luminescence and Laser-Induced Breakdown Spectroscopy (LIBS).
Raman Spectroscopy
Raman spectroscopy is an analytical tool for analyzing molecules properties. Its theoretical origins roots to Prof. C.V, Raman of India an Indian physicist whose work was influential in the growth of science in the world. Raman Spectroscopy is a non-destructive light scattering measurement technique, which provides extremely rich chemical and structural information of the sample. The existence of slight wavelength shift between the inelastically scattered photon wavelength and the stimulating photon wavelength is related to the sample molecule “finger-print” properties, and provides the chemical and structural information of the sample.

In Raman Spectroscopy, a laser source illuminates a spot on the surface being scanned, whether vehicle, drum, left-behind luggage, etc. Any explosive residue present on the object produces Raman scattering. Then, the scattered light is collected by a telescope and analyzed by a spectrometer and detector. A spectral fingerprint (i.e., the Raman spectrum) is generated in as little as 5-20 seconds. Finally, the spectrum is compared with previously recorded Raman spectral analysis to identify suspicious substances.
Laser-induced breakdown spectroscopy (LIBS)
Laser-induced breakdown spectroscopy (LIBS) employs a powerful laser beam, most often from a pulsed Nd:YAG laser, with an emission wavelength of 1064 or 532 nm, transmitted in a single, powerful pulse, less than 10 nanoseconds duration, packing 50 to 100 millijoules of energy, focused onto the sample material. The impact generates a plasma spark at the surface, with typical temperature in the plasma reaching 10,000 K. At that temperature the species present are exited into electronically excited atoms and ions. As the excited species decay, they emit radiation at wavelengths that are distinct to each chemical element, typically in the ultraviolet to near-infrared range. Light from the spark is gathered by a spectrometer and analyzed by a computer.

Attached are a number of technical articles and patents owned by LDS
Patents:
Explosives detection and identification method, 2002
M. Brestel, M. Gaft, U. Sharon. ,
Israeli Patent Application N 151745.
Controlled substance detection and identification system
M. Brestel, M. Gaft, U. Sharon.
U.S. Patent Application N 20040051867 Serial N428398 Filed May 2, 2003.
Personal identification, verification and controlled substances detection and verification system
M. Brestel, M. Gaft, U. Sharon, G. Vargo.
U.S. Patent 6,914,668, July 2005.
Mineral Detection and Content Evaluation Method
M. Gaft, L. Nagli.
U.S. Patent 6,753,957 B1, June 2004
Articles
UV Gated Raman for remote explosives detection
M. Gaft, L. Nagli.
PITTCON 2010, Raman spectroscopy, Asher and Jackovitz session, 2010. Invited lecture
Narrow gated Raman and luminescence of explosives
Y. Fleger, L. Nagli, M. Gaft, M. Rosenbluh.
J. of Luminescence, 2009, 129, pp 979–983.
Liquid explosives detection in transparent containers
M. Gaft, L. Nagli.
Proceedings of SPIE, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets
XV, 2010, pp 76641N1-19.