The University of Southampton
University of Southampton Institutional Repository

High-performance ultrafast humidity sensor based on microknot resonator-assisted Mach-Zehnder for monitoring human breath

High-performance ultrafast humidity sensor based on microknot resonator-assisted Mach-Zehnder for monitoring human breath
High-performance ultrafast humidity sensor based on microknot resonator-assisted Mach-Zehnder for monitoring human breath
Monitoring the dynamic humidity requires sensors with fast response and anti-electromagnetic interference, especially for human respiration. Here, an ultrafast fiber-optic breath sensor based on the humidity-sensitive characteristics of gelatin film is proposed and experimentally demonstrated. The sensor consists of a microknot resonator superimposed on a Mach–Zehnder (MZ) interferometer produced by a tapered single-mode fiber, which has an ultrafast response (84 ms) and recovery time (29 ms) and a large dynamic transmission range. The humidity in dynamic ambient causes changes in the refractive index of gelatin coating, which could trigger spectral intensity transients that can be explicitly distinguished between the two states. The sensing principle is analyzed using the traditional transfer-matrix analysis method. The influence of coating thickness on the sensor’s trigger threshold is further investigated. Experiments on monitoring breath patterns indicate that the proposed breath sensor has high repeatability, reliability, and validity, which enable many other potential applications such as food processing, health monitoring, and other biomedical applications.
fiber-optic device, human breath monitoring, humidity sensor, microknot resonator, ultrafast response
2379-3694
3404-3410
Yi, Yating
5fd4439a-1dc9-477a-8a2f-716ac61751ca
Jiang, Yuxuan
1cdd584c-b8de-4989-b4f3-1c38046290cd
Zhao, Haiyan
d273959c-2e0a-49f4-812e-6c1565298391
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Fan, Yaxian
8408f78b-3b21-4eec-b83e-84a6bd34993e
Wang, Pengfei
a1ba240f-d4f0-4150-bcd8-cb418e841dcb
Yi, Yating
5fd4439a-1dc9-477a-8a2f-716ac61751ca
Jiang, Yuxuan
1cdd584c-b8de-4989-b4f3-1c38046290cd
Zhao, Haiyan
d273959c-2e0a-49f4-812e-6c1565298391
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Fan, Yaxian
8408f78b-3b21-4eec-b83e-84a6bd34993e
Wang, Pengfei
a1ba240f-d4f0-4150-bcd8-cb418e841dcb

Yi, Yating, Jiang, Yuxuan, Zhao, Haiyan, Brambilla, Gilberto, Fan, Yaxian and Wang, Pengfei (2020) High-performance ultrafast humidity sensor based on microknot resonator-assisted Mach-Zehnder for monitoring human breath. ACS Sensors, 5 (11), 3404-3410. (doi:10.1021/acssensors.0c00863).

Record type: Article

Abstract

Monitoring the dynamic humidity requires sensors with fast response and anti-electromagnetic interference, especially for human respiration. Here, an ultrafast fiber-optic breath sensor based on the humidity-sensitive characteristics of gelatin film is proposed and experimentally demonstrated. The sensor consists of a microknot resonator superimposed on a Mach–Zehnder (MZ) interferometer produced by a tapered single-mode fiber, which has an ultrafast response (84 ms) and recovery time (29 ms) and a large dynamic transmission range. The humidity in dynamic ambient causes changes in the refractive index of gelatin coating, which could trigger spectral intensity transients that can be explicitly distinguished between the two states. The sensing principle is analyzed using the traditional transfer-matrix analysis method. The influence of coating thickness on the sensor’s trigger threshold is further investigated. Experiments on monitoring breath patterns indicate that the proposed breath sensor has high repeatability, reliability, and validity, which enable many other potential applications such as food processing, health monitoring, and other biomedical applications.

Text
High-Performance Ultrafast Humidity Sensor Based on Microknot Resonator-Assisted Mach-Zehnder for Monitoring Human Breath - Accepted Manuscript
Download (761kB)

More information

Accepted/In Press date: 6 October 2020
e-pub ahead of print date: 14 October 2020
Published date: 25 November 2020
Keywords: fiber-optic device, human breath monitoring, humidity sensor, microknot resonator, ultrafast response

Identifiers

Local EPrints ID: 451233
URI: http://eprints.soton.ac.uk/id/eprint/451233
ISSN: 2379-3694
PURE UUID: ef7b5e7b-f0b7-4f5f-89c8-464c32a3a64c
ORCID for Gilberto Brambilla: ORCID iD orcid.org/0000-0002-5730-0499

Catalogue record

Date deposited: 14 Sep 2021 20:15
Last modified: 28 Apr 2022 06:15

Export record

Altmetrics

Contributors

Author: Yating Yi
Author: Yuxuan Jiang
Author: Haiyan Zhao
Author: Yaxian Fan
Author: Pengfei Wang

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×