Abstract
A thermal infrared scanner is devised based on a triangular coplanar array of Non-Dispersive Infrared (NDIR) sensors to estimate the direction of turbulent gas wave flow initiated by an activity by probing small density variations in gravity induced carbon dioxide as a tracer in a non-ventilated room. The scanner specifically designed for intrusion detection in a quiescent vicinity such as a vault and can be an added surveillance tool. Steering of intrusion is determined by initially measuring phase shifted thermal gradient in a range in three Active Detection Zones (ADZs) formed by compensated NDIR sensors that are highly contrasted in 4.26 μm absorption band. Estimation of Direction of Arrival (EDOA) employed numerical analysis to solve a system of hyperbolic equation form by Time Difference of Arrival (TDOA) method and determination of steering angle of the wave flow. System specific compensated normalized absorption model for NDIR sensors and numerical routines are developed. Comparison of actual and estimated steering angles are benchmarked in simulation that gives average error of 0.28 % and average relative error of 0.0073 deg/cm, while in two different experiments more than 92 % and 74 % average accuracies are obtained in finding positive steering values.
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