Tilted fiber Bragg grating fixed in a polypropylene tube for ultrasonic sensing and imaging of simulated geological models

• Published in: Optics and laser technology Vol. 140; p. 107075
• Main Authors: Gang, Tingting, Zhang, Xuan, Sun, Ruijuan
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.08.2021; Elsevier BV
• Subjects: Bragg gratings; Data processing; Imaging of simulated geological models; Polypropylene; Seismic stability; Sensors; Tilted fiber Bragg grating; Ultrasonic sensing; Ultrasonic testing; Imaging of simulated geological models; Ultrasonic sensing; Tilted fiber Bragg grating
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2021.107075

•A fiber ultrasonic sensor based on TFBG is proposed and demonstrated.•TFBG is packaged in a tilted tube resulting great stability and direction dependence.•2D images of models are reconstructed using time lapse changes in reflected signal. A fiber ultrasonic sensor based on tilted fiber Bragg grating (TFBG) is proposed and demonstrated both in theory and experiment. The sensor probe is packaged in a sturdily tilted polypropylene tube resulting improvements in great stability and direction dependence. In experiments, the proposed sensor performs a high ultrasonic wave (UW) sensitivity and thus it can obtain layers information in rock models. After scanning slope and surface seismic physical models, cross-section imaging of models is achieved finally by data processing and reconstruction.