Surface-Mounted Tilt Sensor Using Fiber Bragg Grating Technology for Engineered Slope Monitoring With Temperature Compensation
Document Type
Article
Publication Date
6-1-2023
Abstract
A surface-mounted tilt sensor was designed and fabricated to measure the inclination angle of engineered structures or slopes in two directions. The device utilizes two strain-sensitive fiber Bragg gratings (FBGs) for tilt angle measurement bidirectionally and one strain-free FBG to provide temperature compensation. In this work, a tilt sensor prototype was fabricated using a 3-D printer, with a robust enclosure and a miniature actuator with dimensions of 115 x 65 x 30 mm and 45 x 20 x 3 mm, respectively. The device was first calibrated in the laboratory for tilt and temperature parameters. For tilt calibration, the device yields a sensitivity value of 0.0135 and 0.0123 nm/. for +x- and -x-directions. On the other hand, the device delivers a sensitivity value of 0.0105 nm/.C as the response to temperature changes. The tilt sensor was also tested for suitability in a real-field deployment where it was installed on a retaining wall and was left for four weeks. The field test data indicate no vertical displacement of the wall since the device exhibits zero inclination changes during the test period. This compact, robust, and easy-to-install tilt sensor has excellent potential for various geotechnical applications, mainly in landslide detections, ground movement, and engineered slope monitoring.
Keywords
Sensors, Fiber gratings, Temperature sensors, Optical fiber sensors, Actuators, Temperature measurement, Monitoring, Engineered slope monitoring, fiber Bragg gratings (FBGs), ground movement, landslides, tilt sensor
Divisions
PHYSICS,photonics
Funders
Universiti Malaya (PPSI-2020-HICOE-02) ; (IF022-2020),Royal Academy of Engineering - UK,British Council-MIGHT Newton Ungku Omar Fund (NUOF) (IF022-2020)
Publication Title
IEEE Sensors Journal
Volume
23
Issue
12
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Publisher Location
445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA