{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T17:22:34Z","timestamp":1778001754917,"version":"3.51.4"},"reference-count":30,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2023,8,20]],"date-time":"2023-08-20T00:00:00Z","timestamp":1692489600000},"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":["62075170"],"award-info":[{"award-number":["62075170"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["JCYJ20200109144003948"],"award-info":[{"award-number":["JCYJ20200109144003948"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["JCYJ20220530153004009"],"award-info":[{"award-number":["JCYJ20220530153004009"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["JCYJ20220818095615034"],"award-info":[{"award-number":["JCYJ20220818095615034"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Science and Technology Innovation Commission of Shenzhen","award":["62075170"],"award-info":[{"award-number":["62075170"]}]},{"name":"Science and Technology Innovation Commission of Shenzhen","award":["JCYJ20200109144003948"],"award-info":[{"award-number":["JCYJ20200109144003948"]}]},{"name":"Science and Technology Innovation Commission of Shenzhen","award":["JCYJ20220530153004009"],"award-info":[{"award-number":["JCYJ20220530153004009"]}]},{"name":"Science and Technology Innovation Commission of Shenzhen","award":["JCYJ20220818095615034"],"award-info":[{"award-number":["JCYJ20220818095615034"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We demonstrated a new optical fiber modal interferometer (MI) for airflow sensing; the novelty of the proposed structure is that an MI is fabricated based on a piece of HAF, which makes the sensitive MI itself also a hotwire. The interferometer is made by applying arc-discharge tapering and then flame tapering on a 10 mm length high attenuation fiber (HAF, 2 dB\/cm) with both ends spliced to a normal single mode fiber. When the diameter of the fiber in the processing region is reduced to about 2 \u03bcm, the near-infrared dispersion turning point (DTP) can be observed in the interferometer\u2019s transmission spectrum. Due to the absorption of the HAF, the interferometer will have a large temperature increase under the action of a pump laser. At the same time, the spectrum of the interferometer with a DTP is very sensitive to the change in ambient temperature. Since airflow will significantly affect the temperature around the fiber, this thermosensitive interferometer with an integrated heat source is suitable for airflow sensing. Such an airflow sensor sample with a 31.2 mm length was made and pumped by a 980 nm laser with power up to 200 mW. In the comparative experiment with an electrical anemometer, this sensor exhibits a very high air-flow sensitivity of \u22122.69 nm\/(m\/s) at a flowrate of about 1.0 m\/s. The sensitivity can be further improved by enlarging the waist length, increasing the pump power, etc. The optical anemometer with an extremely high sensitivity and a compact size has the potential to measure a low flowrate in constrained microfluidic channels.<\/jats:p>","DOI":"10.3390\/s23167279","type":"journal-article","created":{"date-parts":[[2023,8,21]],"date-time":"2023-08-21T01:49:34Z","timestamp":1692582574000},"page":"7279","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Dispersion Turning Attenuation Microfiber for Flowrate Sensing"],"prefix":"10.3390","volume":"23","author":[{"given":"Yaqi","family":"Tang","sequence":"first","affiliation":[{"name":"Julong College, Shenzhen Technology University, Shenzhen 518118, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chao","family":"Wang","sequence":"additional","affiliation":[{"name":"Julong College, Shenzhen Technology University, Shenzhen 518118, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xuefeng","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Beijing Aerospace Control Devices, Beijing 100094, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Meng","family":"Jiang","sequence":"additional","affiliation":[{"name":"Institute of Beijing Aerospace Control Devices, Beijing 100094, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junda","family":"Lao","sequence":"additional","affiliation":[{"name":"Julong College, Shenzhen Technology University, Shenzhen 518118, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dongning","family":"Wang","sequence":"additional","affiliation":[{"name":"Julong College, Shenzhen Technology University, Shenzhen 518118, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,8,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Tong, L. (2018). Micro\/Nanofibre Optical Sensors: Challenges and Prospects. Sensors, 18.","DOI":"10.3390\/s18030903"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"101998","DOI":"10.1016\/j.yofte.2019.101998","article-title":"A bandwidth response humidity sensor with micro-nano fibre Bragg grating","volume":"53","author":"Li","year":"2019","journal-title":"Opt. Fiber Technol."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"407","DOI":"10.1515\/nanoph-2013-0033","article-title":"Optical microfibers and nanofibers","volume":"2","author":"Wu","year":"2013","journal-title":"Nanophotonics"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"111754","DOI":"10.1016\/j.sna.2019.111754","article-title":"In-line microfiber MZI operating at two sides of the dispersion turning point for ultrasensitive RI and temperature measurement","volume":"301","author":"Xia","year":"2020","journal-title":"Sens. Actuators A Phys."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"23103","DOI":"10.1364\/OE.27.023103","article-title":"Ultra-high sensitivity of dual dispersion turning point taper-based Mach-Zehnder interferometer","volume":"27","author":"Sun","year":"2019","journal-title":"Opt. Express"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"2528","DOI":"10.1109\/JLT.2021.3053042","article-title":"Ultrasensitive Broadband Refractometer Based on Single Stress-Applying Fiber at Dispersion Turning Point","volume":"39","author":"Xu","year":"2021","journal-title":"J. Light. Technol."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"29148","DOI":"10.1364\/OE.26.029148","article-title":"Highly sensitive gas refractometers based on optical microfiber modal interferometers operating at dispersion turning point","volume":"26","author":"Zhang","year":"2018","journal-title":"Opt. Express"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"2409","DOI":"10.1109\/JLT.2018.2815558","article-title":"Spectral Characteristics and Ultrahigh Sensitivities Near the Dispersion Turning Point of Optical Microfiber Couplers","volume":"36","author":"Li","year":"2018","journal-title":"J. Light. Technol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"679","DOI":"10.1364\/OL.43.000679","article-title":"Ultrasensitive measurement of gas refractive index using an optical nanofiber coupler","volume":"43","author":"Li","year":"2018","journal-title":"Opt. Lett."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"32983","DOI":"10.1364\/OE.439959","article-title":"Highly sensitive vibration sensor based on the dispersion turning point microfiber Mach-Zehnder interferometer","volume":"29","author":"Liu","year":"2021","journal-title":"Opt. Express"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"24521","DOI":"10.1364\/OE.25.024521","article-title":"Fiber-optic anemometer based on single-walled carbon nanotube coated tilted fiber Bragg grating","volume":"25","author":"Zhang","year":"2017","journal-title":"Opt. Express"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"3373","DOI":"10.1109\/JLT.2019.2916572","article-title":"Plasmonic Fiber-Optic Photothermal Anemometers with Carbon Nanotube Coatings","volume":"37","author":"Liu","year":"2019","journal-title":"J. Light. Technol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"2578","DOI":"10.1364\/OL.44.002578","article-title":"Constant temperature operation of fiber-optic hot-wire anemometers","volume":"44","author":"Uddin","year":"2019","journal-title":"Opt. Lett."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"18157","DOI":"10.1364\/OE.27.018157","article-title":"Fiber optical temperature compensated anemometer based on dual Fabry-Perot sensors with sealed cavity","volume":"27","author":"Wang","year":"2019","journal-title":"Opt. Express"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1016\/S0924-4247(99)00245-9","article-title":"A fibre-optic grating sensor for the study of flow-induced vibrations","volume":"79","author":"Jin","year":"2000","journal-title":"Sens. Actuator A Phys."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1109\/19.836300","article-title":"Experimental and numerical results of optical preamplification in a laser Doppler anemometer receiving head","volume":"49","author":"Tobben","year":"2000","journal-title":"IEEE Trans. Instrum. Meas."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"10192","DOI":"10.1109\/JSEN.2018.2868089","article-title":"High-Sensitivity \u201cHot-Wire\u201d-Based Gas Velocity Sensor for Safe Monitoring in Mining Applications","volume":"18","author":"Li","year":"2018","journal-title":"IEEE Sens. J."},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Lee, C.L., Liu, K.W., Luo, S.H., Wu, M.S., and Ma, C.T. (2017). A Hot-Polymer Fiber Fabry-Perot Interferometer Anemometer for Sensing Airflow. Sensors, 17.","DOI":"10.3390\/s17092015"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2458","DOI":"10.1109\/LPT.2013.2288634","article-title":"Hot-Wire Anemometer Based on Silver-Coated Fiber Bragg Grating Assisted by No-Core Fiber","volume":"25","author":"Wang","year":"2013","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"4884","DOI":"10.1109\/JLT.2016.2612299","article-title":"Fiber-Optic Anemometer Based on Bragg Grating Inscribed in Metal-Filled Microstructured Optical Fiber","volume":"34","author":"Wang","year":"2016","journal-title":"J. Light. Technol."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"34011","DOI":"10.1364\/OE.27.034011","article-title":"Temperature compensated fiber optic anemometer based on graphene-coated elliptical core micro-fiber Bragg grating","volume":"27","author":"Gao","year":"2019","journal-title":"Opt. Express"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1109\/50.822788","article-title":"Measurements of thermal effects in fibers doped with cobalt and vanadium","volume":"18","author":"Davis","year":"2000","journal-title":"J. Light. Technol."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Njegovec, M., Pevec, S., and Donlagic, D. (2021). Optical Micro-Wire Flow-Velocity Sensor. Sensors, 21.","DOI":"10.3390\/s21124025"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"10124","DOI":"10.1364\/OE.19.010124","article-title":"All-optical fiber anemometer based on laser heated fiber Bragg gratings","volume":"19","author":"Gao","year":"2011","journal-title":"Opt. Express"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"2450","DOI":"10.1109\/LPT.2013.2288115","article-title":"Fiber Bragg Grating Anemometer with Reduced Pump Power-Dependency","volume":"25","author":"Cho","year":"2013","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"3966","DOI":"10.1364\/OL.39.003966","article-title":"Fiber-optic flow sensors for high-temperature environment operation up to 800 degrees C","volume":"39","author":"Chen","year":"2014","journal-title":"Opt. Lett."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"4393","DOI":"10.1364\/OE.25.004393","article-title":"Highly sensitive miniature fluidic flowmeter based on an FBG heated by Co2+-doped fiber","volume":"25","author":"Liu","year":"2017","journal-title":"Opt. Express"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"40015","DOI":"10.1364\/OE.441255","article-title":"Fiber-optic airflow velocity sensing method based on a 45 degrees tilt fiber grating combined with a single-walled carbon nanotube coated fiber","volume":"29","author":"Li","year":"2021","journal-title":"Opt. Express"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"3010","DOI":"10.1109\/JLT.2021.3137239","article-title":"Optical Fiber Thermal Anemometer with Light Source-Heated Fabry-Perot Interferometer","volume":"40","author":"Zhang","year":"2022","journal-title":"J. Light. Technol."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1775","DOI":"10.1109\/LPT.2019.2946595","article-title":"Novel Airflow Sensor Using Laser Heated Sn-Microsphere Airgap Fiber Fabry\u2013P\u00e9rot Interferometer","volume":"31","author":"Lee","year":"2019","journal-title":"IEEE Photonics Technol. Lett."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/23\/16\/7279\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T20:37:51Z","timestamp":1760128671000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/23\/16\/7279"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,8,20]]},"references-count":30,"journal-issue":{"issue":"16","published-online":{"date-parts":[[2023,8]]}},"alternative-id":["s23167279"],"URL":"https:\/\/doi.org\/10.3390\/s23167279","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,8,20]]}}}