Abstract
Acoustic reflective delay lines are ideally suited as cooperative targets for passive wireless sensing: a dedicated temperature sensor was designed and manufactured to demonstrate passive bi-static measurement using 25 kW terrestrial video broadcast emission at a range of 4850 m, with a continuous refresh rate of a measurement every second. The sensor was buried 5 cm deep in sand with a reader antenna located 10 cm from the sensor, a deployment scenario representative of distributed passive sensors for civil engineering monitoring.
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