Journal
OPTICAL ENGINEERING
Volume 62, Issue 8, Pages -Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.OE.62.8.086101
Keywords
fiber Bragg gratings; fiber Bragg grating sensors; ground movement; soil pressure; pressure sensor
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This paper presents the design and fabrication of an optical-based pressure sensor that utilizes a fiber Bragg grating (FBG) as the pressure sensing mechanism. The sensor can convert the pressure applied to its surface into a wavelength shift. Laboratory testing shows a high sensitivity, and field testing confirms its effectiveness in soil monitoring applications.
An optical-based pressure sensor for a 150 x 150 mm surface was designed and fabricated. The sensor utilizes a fiber Bragg grating (FBG) attached to a 30 x 30 x 30 mm actuator as the pressure sensing mechanism. The middle section of the actuator, which is circular, can bend into an elliptical form and, in the process, pull the FBGP via both ends when force or pressure is applied, thus converting the pressure applied to its surface into a wavelength shift. In laboratory testing, a sensitivity of 0.152 nm / kPa was obtained. Subsequently, the pressure sensor was tested in the field by burying it 20 cm underground to measure soil pressure, while another FBG was spliced in series to the FBGP to compensate for temperature variations. Testing shows that the proposed design can realize a compact optical-based pressure sensor with enhanced soil monitoring applications such as dynamic soil pressure caused by soil movement.
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