Fiber-Optic Explosive Detection Device

In this proposal, we outline a plan to develop a novel ultra-compact fiber-optic Raman device for the detection of a variety of explosives. Its novelty is based on a sample cell design that allows enhanced overlap between the excitation laser and the gas sample, as well as more efficient signal collection. By optimizing laser source, sample cell and signal collection, ultra-sensitive detection to < 10 ppb may be achieved with this all-optical approach. Due to the specificity with the Raman technique, virtually zero false alarms can be obtained. Further, the proposed Raman device is all-optical and does not require any sample preparation or special materials for signal transduction. Further, the approach allows for a significant improvement in ruggedness compared to conventional designs. We outline the operational principles of the proposed system and the anticipated performance envelope, including a noise-reduction scheme. For Phase I, we propose to develop a breadboard system for analysis of critical performance and design parameters, determine the suitability for practical use under a variety of environmental conditions, and deliver a conceptual prototype design to be produced in Phase II.