{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,10]],"date-time":"2026-01-10T00:33:47Z","timestamp":1768005227733,"version":"3.49.0"},"reference-count":20,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2018,10,31]],"date-time":"2018-10-31T00:00:00Z","timestamp":1540944000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["11872208"],"award-info":[{"award-number":["11872208"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>An optical fiber displacement sensor based on the microwave photonics interferometric (MWPI) method is proposed and experimented, which provides an ideal solution for large range displacement measurement with high resolution. The sensor used a Michelson microwave photonics interferometer to sense the displacement with one sensing arm and a length-adjusted reference arm. The displacement variation would change the period of the microwave response function of the interferometer. According to the principle that the phase difference in one free spectral range (FSR) of the microwave response function is 360\u00b0, the displacement can be retrieved by the microwave response function by means of a vector network analyzer (VNA). A programmable path-switching true time delay line was used in the reference arm to decrease the microwave bandwidth. The measurement results show that the displacement sensing range is larger than 3 m and the measurement resolution is 31 \u03bcm. Finally, the measurement stability is tested, and the factors affecting the measurement resolution of this method and the main source of errors are investigated in detail.<\/jats:p>","DOI":"10.3390\/s18113702","type":"journal-article","created":{"date-parts":[[2018,10,31]],"date-time":"2018-10-31T11:55:41Z","timestamp":1540986941000},"page":"3702","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Optical Fiber Displacement Sensor Based on Microwave Photonics Interferometry"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4236-6479","authenticated-orcid":false,"given":"Hao","family":"Dong","sequence":"first","affiliation":[{"name":"College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shicheng","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7961-4854","authenticated-orcid":false,"given":"Liming","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, National University of Singapore, Singapore 119260, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiangbo","family":"Peng","sequence":"additional","affiliation":[{"name":"Institute of Opt-Electronics, Harbin Institute of Technology, Harbin 150080, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keming","family":"Cheng","sequence":"additional","affiliation":[{"name":"College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2018,10,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"270","DOI":"10.1016\/j.sna.2005.09.056","article-title":"Sensors in position control applications for industrial automation","volume":"129","author":"Reininger","year":"2006","journal-title":"Sens. Actuators A Phys."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Liu, X.K., Peng, K., Chen, Z.R., Pu, H.J., and Yu, Z.C. (2016). A new capacitive displacement sensor with nanometer accuracy and long range. IEEE Sens. J., 2306\u20132316.","DOI":"10.1109\/JSEN.2016.2521681"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Liu, W., Liang, B., Jia, Z.Y., Feng, D., Jiang, X.T., Li, X., and Zhou, M.D. (2018). High-accuracy calibration based on linearity adjustment for eddy current displacement sensor. Sensors, 18.","DOI":"10.3390\/s18092842"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"5298","DOI":"10.1109\/JSEN.2017.2719101","article-title":"Design and development of a planar linear variable differential transformer for displacement sensing","volume":"17","author":"Anandan","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"106","DOI":"10.1016\/j.sna.2012.10.016","article-title":"A review of nanometer resolution position sensors: Operation and performance","volume":"190","author":"Fleming","year":"2013","journal-title":"Sens. Actuators A Phys."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1016\/j.optlastec.2018.03.005","article-title":"High displacement resolution encoder by using triple grating combination interferometer","volume":"105","author":"Hsu","year":"2018","journal-title":"Opt. Laser Technol."},{"key":"ref_7","first-page":"0600904","article-title":"Analysis of output characteristic model of magnetostrictive displacement sensor under a helical magnetic field and stress","volume":"26","author":"Zhang","year":"2016","journal-title":"IEEE Trans. Appl. Supercond."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"A428","DOI":"10.1364\/OE.23.00A428","article-title":"Sensing the earth crustal deformation with nano-strain resolution fiber-optic sensors","volume":"23","author":"Liu","year":"2015","journal-title":"Opt. Express"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1602","DOI":"10.1109\/JSEN.2010.2103307","article-title":"Wide-Range displacement sensor based on fiber-optic Fabry\u2013Perot interferometer for subnanometer measurement","volume":"11","author":"Zhou","year":"2011","journal-title":"IEEE Sens. J."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"2886","DOI":"10.1364\/OL.37.002886","article-title":"Dual-modulation fiber Fabry-Perot interferometer with double reflection for slowly-varying displacements","volume":"37","author":"Seat","year":"2012","journal-title":"Opt. Lett."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"5840","DOI":"10.1109\/JSEN.2017.2737556","article-title":"A high-sensitivity fiber Bragg grating displacement sensor based on transverse property of a tensioned optical fiber configuration and its dynamic performance improvement","volume":"17","author":"Li","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"337","DOI":"10.1109\/JLT.2011.2181334","article-title":"Wide range FBG displacement sensor based on twin-core fiber filter","volume":"30","author":"Zou","year":"2012","journal-title":"J. Lightwave Technol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"2324","DOI":"10.1109\/JLT.2016.2535662","article-title":"A highly sensitive fibre-optic nano-displacement sensor based on surface plasmon resonance","volume":"34","author":"Wang","year":"2016","journal-title":"J. Lightwave Technol."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1109\/LPT.2014.2375651","article-title":"Long-range interferometric displacement sensing with tapered optical fiber tips","volume":"27","author":"Villatoro","year":"2015","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"3666","DOI":"10.1109\/JLT.2018.2841973","article-title":"A fiber-optic displacement sensor using the spectral demodulation method","volume":"36","author":"Yang","year":"2018","journal-title":"J. Lightwave Technol."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"3193","DOI":"10.1364\/OE.21.003193","article-title":"Compact micro-displacement sensor with high sensitivity based on a long-period fiber grating with an air-cavity","volume":"21","author":"Qi","year":"2013","journal-title":"Opt. Express."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"21910","DOI":"10.1364\/OE.24.021910","article-title":"Displacement measurement using an optoelectronic oscillator with an intra-loop Michelson interferometer","volume":"24","author":"Lee","year":"2016","journal-title":"Opt. Express."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"4412","DOI":"10.1364\/OL.39.004412","article-title":"Long-range, high-precision absolute distance measurement based on two optoelectronic oscillators","volume":"39","author":"Wang","year":"2014","journal-title":"Opt. Lett."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"90","DOI":"10.1109\/LPT.2016.2628963","article-title":"High-performance low coherence interferometry using SSB modulation","volume":"29","author":"Bolea","year":"2017","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"5501410","DOI":"10.1109\/JPHOT.2014.2363443","article-title":"Microwave photonics filtering technique for interrogating a very-weak fiber Bragg grating cascade sensor","volume":"6","author":"Ricchiuti","year":"2014","journal-title":"IEEE Photonics J."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/11\/3702\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T15:27:08Z","timestamp":1760196428000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/11\/3702"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,10,31]]},"references-count":20,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2018,11]]}},"alternative-id":["s18113702"],"URL":"https:\/\/doi.org\/10.3390\/s18113702","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2018,10,31]]}}}