{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T15:29:42Z","timestamp":1777908582746,"version":"3.51.4"},"reference-count":31,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2015,5,7]],"date-time":"2015-05-07T00:00:00Z","timestamp":1430956800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>An integrated sensor for the measurement and monitoring of position and inclination, characterized by low cost, small size and low weight, has been designed, realized and calibrated at the Geomatics Lab of the University of Calabria. The design of the prototype, devoted to the monitoring of landslides and structures, was aiming at realizing a fully automated monitoring instrument, able to send the data acquired periodically or upon request by a control center through a bidirectional transmission protocol. The sensor can be released with different accuracy and range of measurement, by choosing bubble vials with different characteristics. The instrument is provided with a computer, which can be programmed so as to independently perform the processing of the data collected by a single sensor or a by a sensor network, and to transmit, consequently, alert signals if the thresholds determined by the monitoring center are exceeded. The bidirectional transmission also allows the users to vary the set of the monitoring parameters (time of acquisition, duration of satellite acquisitions, thresholds for the observed data). In the paper, hardware and software of the sensor are described, along with the calibration, the results of laboratory tests and of the first in field acquisitions.<\/jats:p>","DOI":"10.3390\/s150510806","type":"journal-article","created":{"date-parts":[[2015,5,7]],"date-time":"2015-05-07T10:54:29Z","timestamp":1430996069000},"page":"10806-10824","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["POIS, a Low Cost Tilt and Position Sensor: Design and First Tests"],"prefix":"10.3390","volume":"15","author":[{"given":"Giuseppe","family":"Artese","sequence":"first","affiliation":[{"name":"Civil Engineering Department, University of Calabria, Via Bucci Cubo 45B, 87036 Rende, Italy"}]},{"given":"Michele","family":"Perrelli","sequence":"additional","affiliation":[{"name":"Civil Engineering Department, University of Calabria, Via Bucci Cubo 45B, 87036 Rende, Italy"}]},{"given":"Serena","family":"Artese","sequence":"additional","affiliation":[{"name":"Department of Informatics, Modeling, Electronic and System Engineering\u2014DIMES,  University of Calabria, Via P. Bucci Cubo 42C, 87036 Rende, Italy"}]},{"given":"Sebastiano","family":"Meduri","sequence":"additional","affiliation":[{"name":"Department of Informatics, Modeling, Electronic and System Engineering\u2014DIMES,  University of Calabria, Via P. Bucci Cubo 42C, 87036 Rende, Italy"}]},{"given":"Natale","family":"Brogno","sequence":"additional","affiliation":[{"name":"Civil Engineering Department, University of Calabria, Via Bucci Cubo 45B, 87036 Rende, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2015,5,7]]},"reference":[{"key":"ref_1","first-page":"1","article-title":"Design of a dual-axis optoelectronic level for precision angle measurements","volume":"5","author":"Fan","year":"2011","journal-title":"Meas. Sci. Technol."},{"key":"ref_2","unstructured":"Perchak, R.M., and McCarty, R.G. (2009). Multi-axis bubble vial device. (7497021 B2), US."},{"key":"ref_3","unstructured":"Lang, W. (1929). Deformationsmessungen an Staumauern Nach den Methoden der Geod\u00e4sie, Verlag der Abteilung f\u00fcr Landestopographie."},{"key":"ref_4","unstructured":"Z\u00f6lly, H. (1929). Die geod\u00e4tischen Arbeiten im 20. Jahrhundert, Verlag der Abteilung f\u00fcr Landestopographie."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Torng, J., Wang, C.H., Huang, Z.N., and Fan, K.C. (2013). A novel dual-axis optoelectronic level with refraction principle. Measur. Sci. Technol.","DOI":"10.1088\/0957-0233\/24\/3\/035902"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"133","DOI":"10.1016\/j.sna.2012.12.001","article-title":"Fully differential current-mode MEMS dual-axis optical inclination sensor","volume":"192","author":"Welch","year":"2013","journal-title":"Sens. Actuators A Phys."},{"key":"ref_7","unstructured":"Leica Geosystems AG TS30 White Paper. Available online: http:\/\/www.gim-international.com\/download\/whitepaper_uploadfile_20.pdf."},{"key":"ref_8","unstructured":"Tamaki, H., Sugai, H., and Kondo, F. (1990). Liquid prism. (EP0161207 B1 3), Patent."},{"key":"ref_9","unstructured":"Lippuner, H. (2006). Tilt sensor. (US20060005407 A1), U.S. Patent."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"6487","DOI":"10.1364\/AO.45.006487","article-title":"Design and analysis of an optoelectronic inclinometer for simultaneous measurement of inclinations along two orthogonal directions","volume":"45","author":"Chen","year":"2006","journal-title":"Appl. Opt."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Constandinou, T.G., and Georgiou, J. (2008). Micro-Optoelectromechanical Tilt Sensor. J. Sens., 2008.","DOI":"10.1109\/ISCAS.2008.4542128"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1016\/j.sna.2012.06.022","article-title":"Development of a mirror mounted fiber optic inclinometer","volume":"184","author":"Lee","year":"2012","journal-title":"Sens. Actuators A Phys."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1177\/1475921710373289","article-title":"Fiber-optic-based displacement transducer to measure bridge deflections","volume":"10","author":"Rodrigues","year":"2011","journal-title":"Struct. Health Monit."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Choi, J.C., Choi, Y.C., Lee, J.K., and Kong, S.H. (2012). Miniaturized Dual-Axis Electrolytic Tilt Sensor. Jpn. J. Appl. Phys., 51.","DOI":"10.7567\/JJAP.51.06FL13"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"16090","DOI":"10.3390\/s131216090","article-title":"A Wireless MEMS-Based Inclinometer Sensor Node for Structural Health Monitoring","volume":"13","author":"Ha","year":"2013","journal-title":"Sensors"},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Borgese, G., Rizzo, L., Artese, G., and Pace, C. (2011, January 14\u201317). Compact wireless GPS\/inertial system. Proceedings of the 4th Annual Caneus Fly-By-Wireless Workshop, FBW 11, Montreal, QC, Canada.","DOI":"10.1109\/FBW.2011.5965567"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Artese, G., Perrelli, M., Artese, S., and Manieri, F. (2014). Geomatics activities for monitoring the large landslide of Maierato, Italy. Appl. Geomat., 1\u201318.","DOI":"10.1007\/s12518-014-0146-8"},{"key":"ref_18","first-page":"661","article-title":"Landslide Monitoring Using Low Cost GNSS Equipment\u2014Experiences from Two Alpine Testing Sites","volume":"5","author":"Heunecke","year":"2011","journal-title":"J. Civil Eng. Archit."},{"key":"ref_19","unstructured":"Cina, A., and Piras, M. (2014). Performance of low-cost GNSS receiver for landslides monitoring: Test and results. Geomat. Nat. Hazards Risk, 1\u201318."},{"key":"ref_20","unstructured":"Koch, D., Brandst\u00e4tter, M., and K\u00fchtreiber, N. (May, January 27). High precision but low-cost GNSS landslide monitoring in Austria. Proceedings of the EGU General Assembly, Vienna, Austria."},{"key":"ref_21","unstructured":"Strago. Available online: http:\/\/www.strago.it\/index.php?lingua=0&sezione=3&pagina=0."},{"key":"ref_22","unstructured":"Cruden, D., and Varnes, D.J. (1996). Special Report 247: Landslides: Investigation and Mitigation\u2014Transportation Research Board, Transportation Research Board."},{"key":"ref_23","unstructured":"Pi Camera. Available online: http:\/\/picamera.readthedocs.org\/en\/release-1.9\/."},{"key":"ref_24","unstructured":"Python Picamera. Available online: http:\/\/www.raspberrypi.org\/documentation\/usage\/camera\/python\/."},{"key":"ref_25","unstructured":"Digi International Inc. ZigBee Wireless Standard. Available online: http:\/\/www.digi.com\/technology\/rf-articles\/wireless-zigbee."},{"key":"ref_26","first-page":"28","article-title":"Overview and Analysis of the Performances of ZigBee Based Wireless Sensor Networks","volume":"29","author":"Mihajlov","year":"2011","journal-title":"Int. J. Comput. Appl."},{"key":"ref_27","first-page":"1615","article-title":"Performance Analysis of XBee ZB Module Based Wireless Sensor Networks","volume":"4","author":"Piyare","year":"2013","journal-title":"Int. J. Sci. Eng. Res."},{"key":"ref_28","unstructured":"Wolfram MathWorld. Available online: http:\/\/mathworld.wolfram.com\/SpiricSection.html."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1330","DOI":"10.1109\/34.888718","article-title":"A flexible new technique for camera calibration","volume":"22","author":"Zhang","year":"2000","journal-title":"IEEE Trans. Pattern Anal. Mach. Intell."},{"key":"ref_30","unstructured":"Remondino, F., and Fraser, C. (2006, January 25\u201327). Digital Camera Calibration Methods: Considerations and Comparisons. Proceedings of the IAPRS, Dresden, Germany. Part 5."},{"key":"ref_31","first-page":"586","article-title":"LEWIS project: An integrated system of monitoring, early warning and mitigation of landslides risk","volume":"21","author":"Versace","year":"2012","journal-title":"Rend. Online Soc. Geol. 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