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Dispersion Turning Attenuation Microfiber for Flowrate Sensing

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 fla...

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Autores principales: Tang, Yaqi, Wang, Chao, Wang, Xuefeng, Jiang, Meng, Lao, Junda, Wang, Dongning
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10459682/
https://www.ncbi.nlm.nih.gov/pubmed/37631816
http://dx.doi.org/10.3390/s23167279
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author Tang, Yaqi
Wang, Chao
Wang, Xuefeng
Jiang, Meng
Lao, Junda
Wang, Dongning
author_facet Tang, Yaqi
Wang, Chao
Wang, Xuefeng
Jiang, Meng
Lao, Junda
Wang, Dongning
author_sort Tang, Yaqi
collection PubMed
description 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 μm, the near-infrared dispersion turning point (DTP) can be observed in the interferometer’s 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 −2.69 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.
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spelling pubmed-104596822023-08-27 Dispersion Turning Attenuation Microfiber for Flowrate Sensing Tang, Yaqi Wang, Chao Wang, Xuefeng Jiang, Meng Lao, Junda Wang, Dongning Sensors (Basel) Communication 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 μm, the near-infrared dispersion turning point (DTP) can be observed in the interferometer’s 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 −2.69 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. MDPI 2023-08-20 /pmc/articles/PMC10459682/ /pubmed/37631816 http://dx.doi.org/10.3390/s23167279 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Tang, Yaqi
Wang, Chao
Wang, Xuefeng
Jiang, Meng
Lao, Junda
Wang, Dongning
Dispersion Turning Attenuation Microfiber for Flowrate Sensing
title Dispersion Turning Attenuation Microfiber for Flowrate Sensing
title_full Dispersion Turning Attenuation Microfiber for Flowrate Sensing
title_fullStr Dispersion Turning Attenuation Microfiber for Flowrate Sensing
title_full_unstemmed Dispersion Turning Attenuation Microfiber for Flowrate Sensing
title_short Dispersion Turning Attenuation Microfiber for Flowrate Sensing
title_sort dispersion turning attenuation microfiber for flowrate sensing
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10459682/
https://www.ncbi.nlm.nih.gov/pubmed/37631816
http://dx.doi.org/10.3390/s23167279
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