Abstract：
:Detecting and analysing motion is a key feature of Smart Homes and the connected sensor vision they embrace. At present, most motion sensors operate in line-of-sight Doppler shift schemes. Here, we propose an alternative approach suitable for indoor environments, which effectively constitute disordered cavities for radio frequency (RF) waves; we exploit the fundamental sensitivity of modes of such cavities to perturbations, caused here by moving objects. We establish experimentally three key features of our proposed system: (i) ability to capture the temporal variations of motion and discern information such as periodicity ("smart"), (ii) non line-of-sight motion detection, and (iii) single-frequency operation. Moreover, we explain theoretically and demonstrate experimentally that the use of dynamic metasurface apertures can substantially enhance the performance of RF motion detection. Potential applications include accurately detecting human presence and monitoring inhabitants' vital signs.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Del Hougne P,F Imani M,Sleasman T,Gollub JN,Fink M,Lerosey G,Smith DRdoi
10.1038/s41598-018-24681-9subject
Has Abstractpub_date
2018-04-25 00:00:00pages
6536issue
1issn
2045-2322pii
10.1038/s41598-018-24681-9journal_volume
8pub_type
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