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The parameters of the SHMF-MZI sensor and the microbend deformer were analyzed and optimized in detail, and then the new encapsulated method of the wearable device was put forward. The proposed wearable sensor could greatly enhance the response to the HR signal. The performances for HR, RR, and BCG monitoring were as good as those of the medically approved commercial monitors. The sensor has the advantages of high sensitivity, easy fabrication, and good stability, providing the potential for application in the field of daily supervision and health monitoring.<\/jats:p>","DOI":"10.3390\/s24072209","type":"journal-article","created":{"date-parts":[[2024,3,31]],"date-time":"2024-03-31T13:32:56Z","timestamp":1711891976000},"page":"2209","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["A Wearable Sandwich Heterostructure Multimode Fiber Optic Microbend Sensor for Vital Signal Monitoring"],"prefix":"10.3390","volume":"24","author":[{"given":"Fumin","family":"Zhou","sequence":"first","affiliation":[{"name":"Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3246-1058","authenticated-orcid":false,"given":"Binbin","family":"Luo","sequence":"additional","affiliation":[{"name":"Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xue","family":"Zou","sequence":"additional","affiliation":[{"name":"Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China"},{"name":"School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaoke","family":"Zou","sequence":"additional","affiliation":[{"name":"Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Decao","family":"Wu","sequence":"additional","affiliation":[{"name":"Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhijun","family":"Wang","sequence":"additional","affiliation":[{"name":"Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yunfang","family":"Bai","sequence":"additional","affiliation":[{"name":"Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingfu","family":"Zhao","sequence":"additional","affiliation":[{"name":"Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,3,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"4373","DOI":"10.1002\/adma.201504366","article-title":"Monitoring of Vital Signs with Flexible and Wearable Medical Devices","volume":"28","author":"Khan","year":"2016","journal-title":"Adv. Mater."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"716","DOI":"10.1111\/pcn.12538","article-title":"Risk factors for early cardiovascular mortality in patients with bipolar disorder","volume":"71","author":"Tsai","year":"2017","journal-title":"Psychiatry Clin. Neurosci."},{"key":"ref_3","first-page":"5","article-title":"Long-Term Evaluation of the Effects of Aclidinium Bromide on Major Adverse Cardiovascular Events and COPD Exacerbations in Patients with Moderate to Very Severe COPD: Rationale and Design of the ASCENT COPD Study","volume":"5","author":"Wise","year":"2018","journal-title":"Chronic Obstr. Pulm. Dis."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Lyu, W.M., Chen, S.Y., Tan, F.Z., and Yu, C.Y. (2022). Vital Signs Monitoring Based on Interferometric Fiber Optic Sensors. Photonics, 9.","DOI":"10.3390\/photonics9020050"},{"key":"ref_5","unstructured":"Wang, F., Tanaka, M., and Chonan, S. (2017). Twelfth International Conference on Adaptive Structures and Technologies, CRC Press."},{"key":"ref_6","unstructured":"Lorenzo, S., Valerio, P., and Paola, R. (2014, January 11\u201312). A novel measurement method for respiration rate by electromagnetic frequency sweep. Proceedings of the 2014 IEEE International Symposium on Medical Measurements and Applications (MeMeA), Lisboa, Portugal."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"126100","DOI":"10.1016\/j.optcom.2020.126100","article-title":"Long modal interference in multimode fiber and its application in vital signs monitoring","volume":"474","author":"Xu","year":"2020","journal-title":"Opt. Commun."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Sartiano, D., and Sales, S. (2017). Low cost plastic optical fiber pressure sensor embedded in mattress for vital signal monitoring. Sensors, 17.","DOI":"10.3390\/s17122900"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"102541","DOI":"10.1016\/j.yofte.2021.102541","article-title":"Low-cost plastic optical fiber sensor embedded in mattress for sleep performance monitoring","volume":"64","author":"Han","year":"2021","journal-title":"Opt. Fiber Technol."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"190034-1","DOI":"10.29026\/oea.2020.190034","article-title":"Contactless vital signs monitoring based on few-mode and multi-core fibers","volume":"3","author":"Tan","year":"2020","journal-title":"Opto-Electron. Adv."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"102530","DOI":"10.1016\/j.yofte.2021.102530","article-title":"Unobtrusive vital signs and activity monitoring based on dual mode fiber","volume":"64","author":"Xu","year":"2021","journal-title":"Opt. Fiber Technol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"5940","DOI":"10.1364\/BOE.10.005940","article-title":"Non-invasive human vital signs monitoring based on twin-core optical fiber sensors","volume":"10","author":"Tan","year":"2019","journal-title":"Biomed. Opt. Express"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"6182","DOI":"10.1109\/JSEN.2020.2974313","article-title":"Noninvasive monitoring of vital signs based on highly sensitive fiber optic mattress","volume":"20","author":"Wang","year":"2020","journal-title":"IEEE Sens. J."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Chen, Z., Lau, D., Teo, J.T., Ng, S.H., Yang, X., and Kei, P.L. (2014). Simultaneous measurement of breathing rate and heart rate using a microbend multimode fiber optic sensor. J. Biomed. Opt., 19.","DOI":"10.1117\/1.JBO.19.5.057001"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"042039","DOI":"10.1088\/1755-1315\/769\/4\/042039","article-title":"Research on Smart Mattress Based on Fiber Unbalanced Sagnac Loop","volume":"769","author":"Ke","year":"2021","journal-title":"IOP Conf. Ser. Earth Environ. Sci."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"022023","DOI":"10.1088\/1742-6596\/1802\/2\/022023","article-title":"Research on intelligent mattress based on improved SMS structure sensing fiber","volume":"1802","author":"Ke","year":"2021","journal-title":"J. Phys. Conf. Ser."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2807","DOI":"10.1109\/JLT.2018.2883413","article-title":"Noninvasive measurement of heart rate and respiratory rate for perioperative infants","volume":"37","author":"Zhang","year":"2019","journal-title":"J. Light. Technol."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"982","DOI":"10.1364\/BOE.450258","article-title":"Noninvasive measurement of the vital signs of cancer patients with a dual-path microbend fiber sensor","volume":"13","author":"Wang","year":"2022","journal-title":"Biomed. Opt. Express"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"757","DOI":"10.1109\/JSEN.2014.2353640","article-title":"Textile fiber optic microbend sensor used for heartbeat and respiration monitoring","volume":"15","author":"Yang","year":"2014","journal-title":"IEEE Sens. J."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2299","DOI":"10.1364\/BOE.452115","article-title":"Respiratory and heart rate monitoring using an FBG 3D-printed wearable system","volume":"13","author":"Tavares","year":"2022","journal-title":"Biomed. Opt. Express"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2260","DOI":"10.1364\/BOE.490034","article-title":"Wearable cardiorespiratory monitoring with stretchable elastomer optical fiber","volume":"14","author":"Zha","year":"2023","journal-title":"Biomed. Opt. Express"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"8333","DOI":"10.1021\/acsami.3c16165","article-title":"Optical Microfiber Intelligent Sensor: Wearable Cardiorespiratory and Behavior Monitoring with a Flexible Wave-Shaped Polymer Optical Microfiber","volume":"16","author":"Wang","year":"2024","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"2001693","DOI":"10.1002\/adom.202001693","article-title":"The principle and architectures of optical stress sensors and the progress on the development of microbend optical sensors","volume":"9","author":"Wang","year":"2021","journal-title":"Adv. Opt. Mater."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"747460","DOI":"10.3389\/fdgth.2021.747460","article-title":"Accurate Estimation of Heart and Respiration Rates Based on an Optical Fiber Sensor Using Adaptive Regulations and Statistical Classifications Spectrum Analysis","volume":"3","author":"Zhao","year":"2021","journal-title":"Front. Digit. Health"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"126","DOI":"10.1016\/j.sna.2016.10.013","article-title":"Design and experiment of an optical fiber micro bend sensor for respiration monitoring","volume":"251","author":"Hu","year":"2016","journal-title":"Sens. Actuators A Phys."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"022100","DOI":"10.1088\/1757-899X\/612\/2\/022100","article-title":"A bio-signal monitoring sensor based on the microbending effect of fiber","volume":"612","author":"Guo","year":"2019","journal-title":"IOP Conf. Ser. Mater. Sci. Eng."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"40251","DOI":"10.1364\/OE.469330","article-title":"Highly sensitive curvature sensor based on a sandwich multimode fiber Mach\u2013Zehnder interferometer","volume":"30","author":"Yang","year":"2022","journal-title":"Opt. Express"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"152","DOI":"10.1016\/j.optcom.2014.12.053","article-title":"Fiber optic transverse load sensor based on polarization properties of \u03c0-phase-shifted fiber Bragg grating","volume":"342","author":"Wang","year":"2015","journal-title":"Opt. Commun."},{"key":"ref_29","first-page":"1","article-title":"Force sensors using the skew-ray-probed plastic optical fibers","volume":"10","author":"Chen","year":"2018","journal-title":"IEEE Photonics J."},{"key":"ref_30","first-page":"1740","article-title":"Weight Measurement and Vibration Detection Sensor Based on a Thermoplastic Polyurethane Optical Fiber","volume":"42","author":"Llera","year":"2023","journal-title":"J. Light. Technol."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"4228","DOI":"10.1364\/OL.428664","article-title":"Vital signs monitoring using the macrobending small-core fiber sensor","volume":"46","author":"Zhao","year":"2021","journal-title":"Opt. Lett."},{"key":"ref_32","unstructured":"(2002). Cardiac Monitors, Heart Rate Meters, and Alarms (Standard No. ANSI\/AAMI EC13: 2002)."},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Setiawan, A.W. (2021, January 2\u20133). Study on Mobile Apps-based Heart Rate Measurement: Female and Male. Proceedings of the 2021 Fourth International Conference on Vocational Education and Electrical Engineering (ICVEE), Surabaya, Indonesia.","DOI":"10.1109\/ICVEE54186.2021.9649689"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"262","DOI":"10.21037\/cdt.2019.04.08","article-title":"Accuracy of wearable heart rate monitors in cardiac rehabilitation","volume":"9","author":"Etiwy","year":"2019","journal-title":"Cardiovasc. Diagn. Ther."},{"key":"ref_35","first-page":"533","article-title":"Certain molar movements of the human body produced by the circulation of the blood","volume":"11","author":"Gordon","year":"1877","journal-title":"J. Anat. Physiol."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"012084","DOI":"10.1088\/1742-6596\/1633\/1\/012084","article-title":"Low-voltage distribution network topology verification method based on Revised Pearson correlation coefficient","volume":"1633","author":"Lou","year":"2020","journal-title":"J. Phys. Conf. Ser."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/24\/7\/2209\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T14:21:05Z","timestamp":1760106065000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/24\/7\/2209"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,3,29]]},"references-count":36,"journal-issue":{"issue":"7","published-online":{"date-parts":[[2024,4]]}},"alternative-id":["s24072209"],"URL":"https:\/\/doi.org\/10.3390\/s24072209","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,3,29]]}}}