Passive RFID: a dense and weather-robust technique to monitor surface deformation, applied to a landslide
Mathieu Le Breton  1, 2, *@  , Laurent Baillet  1@  , Eric Larose  1@  , Etienne Rey  1, 2@  , Philippe Benech  3@  , Denis Jongmans  1@  , Fabrice Guyoton  2@  , Michel Jaboyedoff  4@  
1 : ISTerre
CNRS : UMR5275, Université Grenoble Alpes
2 : Géolithe
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181, rue des Bécasses – 38920 CROLLES -  France
3 : Institut de Microelectronique, Electromagnetisme et Photonique   (IMEP-LAHC)  -  Website
G-INP, UJF, US, CNRS
3 Parvis Louis Néel CS 50257 F - 38016 Grenoble Cedex 1  -  France
4 : Groupe Risk, Institut des Sciences de la Terre, Université de Lausanne
* : Corresponding author

Ground deformation monitoring at a local scale requires a high accuracy and a dense time/space resolution. In practice, the cost of the existing techniques can be a limiting factor for such resolution and density of measurement. Radio-Frequency Identification (RFID) technology appears as an alternative to monitor displacements on a landslide. The low-cost passive RFID tags (20€ / tag) allows for a very dense resolution, in both space and time, at the scale of a 100-m-large surface. This study propose to use such tags on a landslide, to validate its ability to monitor the surface deformation of a landslide outdoors, and assess its accuracy. With this aim, 19 passive RFID tags were deployed on a landslide for 5 months. The relative displacement was estimated by measuring the phase difference of arrival, and compared to a laser tacheometer and an extensometer. That technique reacheed an accuracy of 1 cm during normal weather and 4 cm during snow events, for a range up to 60 m. It could potentially monitor the displacements of other objects, such as volcanoes, buildings, unstable rocks, or snow surface.


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