SPM | MicroSPM | MPEX Electronic Eye | REPAS | QRI

REPAS (Reverse Photo-Acoustic Spectrometer™)

REPAS, licensed exclusively to ViaLogy by Oak Ridge National Laboratory (ORNL), detects minute traces of chemical explosive molecules on surfaces and building walls from standoff distances of tens of meters. Unlike conventional photo-acoustic spectroscopy (PAS) techniques that irradiate a surface and then measure the resulting acoustic emission signature in order to identify the substances on the surface, REPAS measures the change in phase of an externally generated acoustic wave aimed at the infrared irradiated surface. This technique provides greater sensitivity and specificity. REPAS incorporates recent advances in acoustic beam formation, detection of acoustic wave phase, and spectrophotometer miniaturization. In addition, ViaLogy's QRI™ technology makes it possible to detect signals from greater distances, enabling unprecedented standoff distances that increase personnel safety. ViaLogy is incorporating REPAS technology into portable chemical-detection devices used for remote detection of explosives manufacturing in covert and camouflaged buildings, as well as identification of dangerous chemicals being carried by people.

Return to top ^