This contribution deals with the fire detection in the presence of obstacles that are non-transparent to visible or IR wavelengths. Exploiting the penetration capability of microwaves, a solution based on the passive microwave radiometry has been proposed. To investigate such a solution, a theoretical model of the scene sensed by a microwave radiometer is developed, accounting for the presence of both fire spot and wall-like obstacles. By reversing the model's equations it is possible to directly relate the obstacle emissivity, reflectivity and transmissivity to the antenna noise temperatures measured in several conditions. These temperatures have been sensed with a portable, low-cost instrument. The selected 12.65GHz operation frequency features good wall penetration capability to be balanced with a reasonable antenna size.
Remote Sensing of Masked Fire Spots by Low-Cost Microwave Radiometers
ALIMENTI, Federico;TASSELLI, GABRIELE;BONAFONI, Stefania;ROSELLI, Luca;BASILI, Patrizia
2009
Abstract
This contribution deals with the fire detection in the presence of obstacles that are non-transparent to visible or IR wavelengths. Exploiting the penetration capability of microwaves, a solution based on the passive microwave radiometry has been proposed. To investigate such a solution, a theoretical model of the scene sensed by a microwave radiometer is developed, accounting for the presence of both fire spot and wall-like obstacles. By reversing the model's equations it is possible to directly relate the obstacle emissivity, reflectivity and transmissivity to the antenna noise temperatures measured in several conditions. These temperatures have been sensed with a portable, low-cost instrument. The selected 12.65GHz operation frequency features good wall penetration capability to be balanced with a reasonable antenna size.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
