MEMS Enhanced Laser Spectrometer for Ultra-sensitive Toxic Chemical Detection

Block MEMS, LLC proposes the development of an ultra high sensitivity MEMS enhanced, tunable diode laser spectrometer. With the aid of micro-electromechanical (MEMS) components, this spectrometer should achieve a size of <1800 cm3 while exhibiting sensitivities greatly exceeding the current JCAD specification, but with very low false alarm rate. It should exhibit extremely favorable Receiver Operating Characteristic (ROC) curves compared to current IMS or SAW point detection devices. While primarily for chemical detection, the unit should also be capable of biological cueing/detection consistent with current spectral data. The unit could also be adapted to serve as a moderate range (from 10 to 50 meters) standoff detector at somewhat larger size, weight, and power The approach combines several variable frequency Quantum Cascade Lasers operating in the 2-14 µm infrared (IR) “fingerprint” region. The unit can also measure some Mie scatter parameters which would help detection of biological aerosols. The Block approach further seeks to optimize the cost/benefit parameter by first analyzing the optimal spectral discrimination regions which differentiate among toxic species and between toxic species and military or other interferents. Through more efficient use of the spectral discrimination information, we expect further increase in the Signal to Noise Ratio (SNR).