US 12,392,603 B2
Optical fiber sensing method and sensing system for straightness of scraper conveyor
Xinqiu Fang, Xuzhou (CN); Ningning Chen, Xuzhou (CN); Minfu Liang, Xuzhou (CN); Gang Wu, Xuzhou (CN); Haotian Feng, Xuzhou (CN); Yang Song, Xuzhou (CN); Dexing He, Xuzhou (CN); Chunyang Fang, Jinhua (CN); Fukang Qiao, Xuzhou (CN); and Yang Wu, Xuzhou (CN)
Assigned to CHINA UNIVERSITY OF MINING AND TECHNOLOGY, Xuzhou (CN); YONGKANG WEICHUANG OPTOELECTRONIC TECHNOLOGY CO., LTD., Jinhua (CN); and XUZHOU WEIDEAN OPTOELECTRONIC TECHNOLOGY CO., LTD., Xuzhou (CN)
Filed by China University of Mining and Technology, Xuzhou (CN); Yongkang Weichuang Optoelectronic Technology Co., Ltd., Jinhua (CN); and Xuzhou Weidean Optoelectronic Technology Co., Ltd., Xuzhou (CN)
Filed on Oct. 24, 2024, as Appl. No. 18/925,107.
Claims priority of application No. 202311610065.3 (CN), filed on Nov. 29, 2023.
Prior Publication US 2025/0172385 A1, May 29, 2025
Int. Cl. G01B 11/24 (2006.01); G01B 11/27 (2006.01); G01L 1/24 (2006.01)
CPC G01B 11/24 (2013.01) [G01B 11/27 (2013.01); G01L 1/246 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An optical fiber sensing system for implementing an optical fiber sensing method for a straightness of a scraper conveyor, the optical fiber sensing method comprises the following steps:
S10: setting an optical fiber shape sensor along the scraper conveyor, and obtaining a horizontal strain and a vertical strain of a grating measuring point of the scraper conveyor by the optical fiber shape sensor; wherein the optical fiber shape sensor comprises a flexible substrate, an optical fiber Bragg grating and a packaging material, and the optical fiber Bragg grating is fixedly encapsulated on a surface of the flexible substrate through the packaging material;
S20: according to a conversion formula of a sensing strain of the optical fiber shape sensor and a bending curvature of a neutral axis of the flexible substrate, calculating a horizontal curvature and a vertical curvature of the grating measuring point;
S30: inserting a plurality of interpolation nodes between curvature values of two adjacent grating measuring points by a discrete interpolation algorithm;
S40: through a slope recursion algorithm, converting each horizontal curvature and each vertical curvature into a horizontal coordinate value in a horizontal coordinate system and a vertical coordinate value in a vertical coordinate system respectively, and superimposing the horizontal coordinate value with the vertical coordinate value to obtain a three-dimensional space coordinate value of the grating measuring point and the interpolation node; and
S50: obtaining a curve of the optical fiber shape sensor on a horizontal plane by fitting the horizontal coordinate value, obtaining a curve of the optical fiber shape sensor on a vertical plane by fitting the vertical coordinate value, and obtaining a three-dimensional space curve of the optical fiber shape sensor by fitting the three-dimensional space coordinate value;
wherein the step S50 comprises obtaining the straightness of the scraper conveyor such that the straightness of the scraper conveyor is obtained by performing the obtaining the curve of the optical fiber shape sensor on the horizontal plane, the obtaining the curve of the optical fiber shape sensor on the vertical plane, and the obtaining the three-dimensional space curve of the optical fiber shape sensor by fitting the three-dimensional space coordinate value; and
the optical fiber sensing system comprising:
the optical fiber shape sensor disposed along the scraper conveyor;
a curvature calculation module, wherein the curvature calculation module is configured to perform the step S20;
an interpolation calculation module, wherein the interpolation calculation module is configured to perform the step S30;
a coordinate calculation module, wherein the coordinate calculation module is configured to perform the step S40; and
a curve fitting module, wherein the curve fitting module is configured to perform the step S50.