{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T21:02:16Z","timestamp":1774645336664,"version":"3.50.1"},"reference-count":25,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2022,12,10]],"date-time":"2022-12-10T00:00:00Z","timestamp":1670630400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004019","name":"National Institute of Occupational Safety and Health (NIOSH)","doi-asserted-by":"publisher","award":["75D30120C09233"],"award-info":[{"award-number":["75D30120C09233"]}],"id":[{"id":"10.13039\/501100004019","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Brillouin scattering-based distributed fiber optic sensing (DFOS) technologies such as Brillouin optical time domain reflectometry (BOTDR) and Brillouin optical time domain analysis (BOTDA) have broad applicability for the long term and real-time monitoring of large concrete structures, underground mine excavations, pit slopes, and deep subsurface wellbores. When installed in brittle media, however, the meter scale spatial resolution of the BOTDR\/A technology prohibits the detection or measurement of highly localized deformations, such as those which form at or along cracks, faults, and other discontinuities. This work presents a novel hybrid fiber optic cable with the ability to self-anchor to any brittle installation media without the need for manual installation along fixed interval points. Laboratory scale testing demonstrates the ability of the hybrid fiber optic cable to measure strains across highly localized deformation zones in both tension and shear. In addition, results show the applicability of the developed technology for strain monitoring in high displacement environments. Linear relationships are proposed for use in estimating the displacement magnitude along discontinuities in brittle media from strain signals collected from the hybrid fiber optic cable. The hybrid fiber optic cable has broad potential applications, such as geomechanical monitoring in underground mines, surface pits, large civil infrastructure projects, and deep subsurface wellbores. The benefits of fiber optic sensing, such as the intrinsic safety of the sensors, the long sensing range, and real time capabilities make this a compelling technique for long term structural health monitoring (SHM) in a wide range of industrial and civil applications.<\/jats:p>","DOI":"10.3390\/s22249685","type":"journal-article","created":{"date-parts":[[2022,12,12]],"date-time":"2022-12-12T05:10:19Z","timestamp":1670821819000},"page":"9685","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Hybrid Fiber Optic Cable for Strain Profiling and Crack Growth Measurement in Rock, Cement, and Brittle Installation Media"],"prefix":"10.3390","volume":"22","author":[{"given":"Samuel","family":"Nowak","sequence":"first","affiliation":[{"name":"Department of Mining and Explosives Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6975-317X","authenticated-orcid":false,"given":"Taghi","family":"Sherizadeh","sequence":"additional","affiliation":[{"name":"Department of Mining and Explosives Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mina","family":"Esmaeelpour","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5704-9225","authenticated-orcid":false,"given":"Dogukan","family":"Guner","sequence":"additional","affiliation":[{"name":"Department of Mining and Explosives Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kutay E.","family":"Karadeniz","sequence":"additional","affiliation":[{"name":"Department of Mining and Explosives Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Bai, Q., Wang, Q., Wang, D., Wang, Y., Gao, Y., Zhang, H., Zhang, M., and Jin, B. (2019). Recent advances in Brillouin optical time domain reflectometry. Sensors, 19.","DOI":"10.3390\/s19081862"},{"key":"ref_2","unstructured":"Seabrook, B.C., Ellmauthaler, A., LeBlanc, M., Jaaskelainen, M., Maida, J.L., and Wilson, G.A. (2022, January 11\u201315). Comparison of Raman, Brillouin, and Rayleigh Distributed Temperature Measurements in High-Rate Wells. Proceedings of the SPWLA 63rd Annual Logging Symposium, Stavanger, Norway."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"397","DOI":"10.12989\/gae.2015.9.3.397","article-title":"Applications of BOTDR fiber optics to the monitoring of underground structures","volume":"9","author":"Moffat","year":"2015","journal-title":"Geomech. Eng."},{"key":"ref_4","unstructured":"Guan, Z., Jiang, X.Z., Wu, Y.B., and Pang, Z.Y. (2015). Study on Monitoring and Early Warning of Karst Collapse Based on BOTDR Technique, National Cave and Karst Research Institute."},{"key":"ref_5","first-page":"1107","article-title":"Fiber Optic Sensors","volume":"2","author":"Gholamzadeh","year":"2008","journal-title":"Int. J. Electron. Commun. Eng."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Hu, T., Hou, G., and Li, Z. (2020). The field monitoring experiment of the roof strata movement in coal mining based on DFOS. Sensors, 20.","DOI":"10.3390\/s20051318"},{"key":"ref_7","unstructured":"Madjdabadi, B. (2016). Experimental Evaluation of a Distributed Fiber Optic Sensor for Mining Application, University of Waterloo. Available online: http:\/\/hdl.handle.net\/10012\/10443."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"107","DOI":"10.1109\/68.34756","article-title":"Tensile strain dependence of Brillouin frequency shift in silica optical fibers","volume":"1","author":"Horiguchi","year":"1989","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"45","DOI":"10.1006\/ofte.2000.0344","article-title":"Industrial applications of the BOTDR optical fiber strain sensor","volume":"7","author":"Ohno","year":"2001","journal-title":"Opt. Fiber Technol."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"111275","DOI":"10.1016\/j.measurement.2022.111275","article-title":"Sensing fiber selection for point displacement measuring with distributed optic fiber sensor","volume":"197","author":"Zhang","year":"2022","journal-title":"Measurement"},{"key":"ref_11","unstructured":"Mei, Y. (2018). Error Analysis for Distributed Fibre Optic Sensing Technology Based on Brillouin Scattering, University of Cambridge."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Iten, M., Hauswirth, D., and Puzrin, A.M. (2011). Distributed fiber optic sensor development, testing, and evaluation for geotechnical monitoring applications. Smart Sensor Phenomena, Technology, Networks, and Systems 2011, International Society for Optics and Photonics.","DOI":"10.1117\/12.881228"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"385","DOI":"10.1061\/(ASCE)0733-9399(1998)124:4(385)","article-title":"Mechanics of bond and interface shear transfer in optical fiber sensors","volume":"124","author":"Ansari","year":"1998","journal-title":"J. Eng. Mech."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1797","DOI":"10.1061\/(ASCE)EM.1943-7889.0000622","article-title":"Theoretical and experimental investigations into crack detection with BOTDR-distributed fiber optic sensors","volume":"139","author":"Feng","year":"2013","journal-title":"J. Eng. Mech."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"143","DOI":"10.1177\/1475921708089745","article-title":"Performance evaluation of BOTDR-based distributed fiber optic sensors for crack monitoring","volume":"7","author":"Zhang","year":"2008","journal-title":"Struct. Health Monit."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Gao, S., Liu, Y., Li, H., Sun, L., Liu, H., Rao, Q., and Fan, X. (2020). Transformer winding deformation detection based on BOTDR and ROTDR. Sensors, 20.","DOI":"10.3390\/s20072062"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"04021190","DOI":"10.1061\/(ASCE)GM.1943-5622.0002155","article-title":"Experimental research on strain transfer behavior of fiber-optic cable embedded in soil using distributed strain sensing","volume":"21","author":"Liu","year":"2021","journal-title":"Int. J. Geomech."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"109461","DOI":"10.1016\/j.measurement.2021.109461","article-title":"Crack monitoring using short-gauged Brillouin fiber optic sensor","volume":"179","author":"Han","year":"2021","journal-title":"Measurement"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"9173","DOI":"10.1038\/s41598-021-88526-8","article-title":"Microanchored borehole fiber optics allows strain profiling of the shallow subsurface","volume":"11","author":"Zhang","year":"2021","journal-title":"Sci. Rep."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"54","DOI":"10.1016\/j.measurement.2015.08.040","article-title":"Experimental evaluation of a distributed Brillouin sensing system for measuring extensional and shear deformation in rock","volume":"77","author":"Madjdabadi","year":"2016","journal-title":"Measurement"},{"key":"ref_21","unstructured":"Madjdabadi, B.M., Valley, B., Dusseault, M.B., and Kaiser, P.K. (2012, January 24\u201327). Numerical Modeling of strain transfer from rock mass to a fiber optic sensor installed inside a grouted borehole. Proceedings of the 46th US Rock Mechanics\/Geomechanics Symposium, Chicago, IL, USA."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Tang, Y. (2016, January 27\u201328). Concrete structure monitoring with distributed long-gauge optical fiber sensor. Proceedings of the 2015 4th International Conference on Sensors, Measurement and Intelligent Materials, Shenzhen, China.","DOI":"10.2991\/icsmim-15.2016.206"},{"key":"ref_23","unstructured":"Nowak, S., Sherizadeh, T., and Esmaeelpour, M. (2022). Optical Fiber Anchor for Distributed Sensing in Brittle Mediums, Missouri University of Science and Technology."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1080\/01468030.2020.1725185","article-title":"Aging and degradation of optical fiber parameters in a 16-year-long period of usage","volume":"39","author":"Maslo","year":"2020","journal-title":"Fiber Integr. Opt."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Allan, M.L. (1999). Guidlines for Mixing and Placing Thermally Conductive Cementitious Grout (Mix 111), Brookhaven National Laboratory. Informal Report.","DOI":"10.2172\/751159"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/24\/9685\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:37:49Z","timestamp":1760146669000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/24\/9685"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,12,10]]},"references-count":25,"journal-issue":{"issue":"24","published-online":{"date-parts":[[2022,12]]}},"alternative-id":["s22249685"],"URL":"https:\/\/doi.org\/10.3390\/s22249685","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,12,10]]}}}