High-sensitivity, high-spatial-resolution distributed strain sensing based on a poly(methyl methacrylate) chirped fiber Bragg grating
In this study, a high-sensitivity, high-spatial-resolution distributed strain-sensing approach based on a poly(methyl methacrylate) chirped fiber Bragg grating (CFBG) is proposed and experimentally demonstrated. Linearly chirped FBGs in a polymer optical fiber provide an alternative to the silica fiber owing to the lower Young’s modulus, which can yield a higher stress sensitivity under the same external force. According to the spatial wavelength-encoded characteristic of the CFBG, a fully distributed strain measurement can be achieved by optical frequency-domain reflectometry. Through time-/space-resolved short-time Fourier transform, the applied force can be located by the beat frequency originated from the space-induced time delay and measured by the differential frequency offset originated from the strain-induced dispersion time delay. In a proof-of-concept experiment, a high spatial resolution of 1 mm over a gauge length of 40 mm and a strain resolution of 0.491 Hz/με were achieved.
基金项目：Hong Kong Polytechnic University
Ziqi Liu：School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Ziqiang Huo：School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Chunfeng Ge：School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
Xin Cheng：Photonics Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
Haw-Yaw Tam：Photonics Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
备注：Hong Kong Polytechnic University
【1】I. Floris, J. Madrigal, S. Sales, J. M. Adam and P. A. Calderón. Experimental study of the influence of FBG length on optical shape sensor performance. Opt. Laser. Eng. 126, (2020).
【2】X. Yang, R. Lindberg, W. Margulis, K. Fr?jdh and F. Laurell. Continuously tunable, narrow-linewidth laser based on a semiconductor optical amplifier and a linearly chirped fiber Bragg grating. Opt. Express. 27, 14213-14220(2019).
【3】T. Li, C. Shi and H. Ren. A high-sensitivity tactile sensor array based on fiber Bragg grating sensing for tissue palpation in minimally invasive surgery. IEEE/ASME Trans. Mechatronics. 23, 2306-2315(2018).
【4】A. Ghoshal, J. Ayers, M. Gurvich, M. Urban and N. Bordick. Experimental investigations in embedded sensing of composite components in aerospace vehicles. Composites Part B. 71, 52-62(2015).
【5】J. He, S. Yang and Q. Wei. Intensity-modulated magnetic field sensor based on fiber Bragg grating. AIP Adv. 9, (2019).
【6】H. Xia, C. Zhang, H. Mu and D. Sun. Edge technique for direct detection of strain and temperature based on optical time domain reflectometry. Appl. Opt. 48, 189-197(2009).
【7】O. Xu, J. Zhang and J. Yao. High speed and high resolution interrogation of a fiber Bragg grating sensor based on microwave photonic filtering and chirped microwave pulse compression. Opt. Lett. 41, 4859-4862(2016).
【8】E. J. Ahmad, C. Wang, D. Feng, Z. Yan and L. Zhang. High temporal and spatial resolution distributed fiber Bragg grating sensors using time-stretch frequency-domain reflectometry. J. Lightwave. Technol. 35, 3289-3295(2016).
【9】K. Yuksel, V. Moeyaert, P. Mégret and M. Wuilpart. Complete analysis of multireflection and spectral-shadowing crosstalks in a quasi-distributed fiber sensor interrogated by OFDR. IEEE Sens. J. 12, 988-995(2011).
【10】H. Liu, H. Liu and G. Peng. Tensile strain characterization of polymer optical fibre Bragg gratings. Opt. Commun. 251, 37-43(2005).
【11】A. G. Leal-Junior, A. Theodosiou, R. Min, J. Casas, C. R. Díaz, W. M. Dos Santos, M. J. Pontes, A. A. Siqueira, C. Marques and K. Kalli. Quasi-distributed torque and displacement sensing on a series elastic actuator’s spring using FBG arrays inscribed in CYTOP fibers. IEEE Sens. J. 19, 4054-4061(2019).
【12】G. Woyessa, A. Fasano, A. Stefani, C. Markos and O. Bang. Single mode step-index polymer optical fiber for humidity insensitive high temperature fiber Bragg grating sensors. Opt. Express. 24, 1253-1260(2016).
【13】A. G. Leal-Junior, H. R. O. Rocha, A. Theodosiou, A. Frizera, C. Marques, K. Kalli and M. R. N. Ribeiro. Optimizing linearity and sensitivity of 3D-printed diaphragms with chirped FBGs in CYTOP fibers. IEEE Access. 8, 31983-31991(2018).
【14】A. R. Prado, A. G. Leal-Junior, C. Marques, S. Leite, G. L. De Sena, L. C. Machado, A. Frizera, M. R. Ribeiro and M. J. Pontes. Polymethyl methacrylate (PMMA) recycling for the production of optical fiber sensor systems. Opt. Express. 25, 30051-30060(2017).
【15】X. Cheng, Y. Liu and C. Yu. Gas pressure sensor based on BDK-doped polymer optical fiber. Micromachines. 10, (2019).
【16】J. Bonefacino, X. Cheng, C.-F. J. Pun, S. T. Boles and H.-Y. Tam. Impact of high UV fluences on the mechanical and sensing properties of polymer optical fibers for high strain measurements. Opt. Express. 28, 1158-1167(2020).
【17】R. Min, B. Ortega and C. Marques. Fabrication of tunable chirped mPOF Bragg gratings using a uniform phase mask. Opt. Express. 26, 4411-4420(2018).
【18】C. Marques, P. Antunes, P. Mergo, D. Webb and P. André. Chirped Bragg gratings in PMMA step-index polymer optical fiber. IEEE Photon. Technol. Lett. 29, 500-503(2017).
【19】J. Bonefacino, H.-Y. Tam, T. S. Glen, X. Cheng, C.-F. J. Pun, J. Wang, P.-H. Lee, M.-L. V. Tse and S. T. Boles. Ultra-fast polymer optical fibre Bragg grating inscription for medical devices. Light Sci. Appl. 7, (2018).
【20】R. Gafsi and M. A. El-Sherif. Analysis of induced-birefringence effects on fiber Bragg gratings. Opt. Fiber. Technol. 6, 299-323(2000).
【21】A. P. Hilton, P. S. Light, L. Talbot and A. N. Luiten. Optimal design for spectral narrowing and fast frequency sweep of an interferometer-stabilized laser. Opt. Lett. 45, 45-48(2020).
Chengang Lyu, Ziqi Liu, Ziqiang Huo, Chunfeng Ge, Xin Cheng, and Haw-Yaw Tam, "High-sensitivity, high-spatial-resolution distributed strain sensing based on a poly(methyl methacrylate) chirped fiber Bragg grating," Photonics Research 8(7), 1134-1139 (2020)