Characterization and use of a fiber optic sensor based on PAH/SiO2 film for humidity sensing in ventilator care equipment
Objective: To develop a compact probe that can be used to monitor humidity in ventilator care equipment. A mesoporous film of alternate layers of Poly(allylamine hydrochloride) (PAH) and silica (SiO2) nanoparticles (bilayers), deposited onto an optical fibre was used. The sensing film behaves as a F...
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| Format: | Article |
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IEEE
2016
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| Online Access: | https://eprints.nottingham.ac.uk/45762/ |
| _version_ | 1848797189561647104 |
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| author | Hernandez, Francisco U. Morgan, Stephen P. Hayes-Gill, Barrie R. Harvey, Daniel Kinnear, William Norris, Andrew Evans, David Hardman, J.G. Korposh, Sergiy |
| author_facet | Hernandez, Francisco U. Morgan, Stephen P. Hayes-Gill, Barrie R. Harvey, Daniel Kinnear, William Norris, Andrew Evans, David Hardman, J.G. Korposh, Sergiy |
| author_sort | Hernandez, Francisco U. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Objective: To develop a compact probe that can be used to monitor humidity in ventilator care equipment. A mesoporous film of alternate layers of Poly(allylamine hydrochloride) (PAH) and silica (SiO2) nanoparticles (bilayers), deposited onto an optical fibre was used. The sensing film behaves as a Fabry-Perot cavity of low-finesse where the absorption of water vapour changes the optical thickness and produces a change in reflection proportional to humidity. Methods: The mesoporous film was deposited upon the cleaved tip of an optical fibre using the layer-by-layer method. The sensor was calibrated in a bench model against a commercially available capacitive sensor. The sensitivity and response time were assessed in the range from 5 % relative humidity (RH) to 95 %RH for different numbers of bilayers up to a maximum of nine. Results: The sensitivity increases with the number of bilayers deposited; sensitivity of 2.28 mV/%RH was obtained for nine bilayers. The time constant of the response was 1.13 s ± 0.30 s which is faster than the commercial device (measured as 158 s). After calibration, the optical fibre humidity sensor was utilised in a bench top study employing a mechanical ventilator. The fast response time enabled changes in humidity in individual breaths to be resolved. Conclusion: Optical fibre sensors have the potential to be used to monitor breath to breath humidity during ventilator care. Significance: Control of humidity is an essential part of critical respiratory care and the developed sensor provides a sensitive, compact and fast method of humidity monitoring. |
| first_indexed | 2025-11-14T19:59:55Z |
| format | Article |
| id | nottingham-45762 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:59:55Z |
| publishDate | 2016 |
| publisher | IEEE |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-457622020-05-04T20:01:12Z https://eprints.nottingham.ac.uk/45762/ Characterization and use of a fiber optic sensor based on PAH/SiO2 film for humidity sensing in ventilator care equipment Hernandez, Francisco U. Morgan, Stephen P. Hayes-Gill, Barrie R. Harvey, Daniel Kinnear, William Norris, Andrew Evans, David Hardman, J.G. Korposh, Sergiy Objective: To develop a compact probe that can be used to monitor humidity in ventilator care equipment. A mesoporous film of alternate layers of Poly(allylamine hydrochloride) (PAH) and silica (SiO2) nanoparticles (bilayers), deposited onto an optical fibre was used. The sensing film behaves as a Fabry-Perot cavity of low-finesse where the absorption of water vapour changes the optical thickness and produces a change in reflection proportional to humidity. Methods: The mesoporous film was deposited upon the cleaved tip of an optical fibre using the layer-by-layer method. The sensor was calibrated in a bench model against a commercially available capacitive sensor. The sensitivity and response time were assessed in the range from 5 % relative humidity (RH) to 95 %RH for different numbers of bilayers up to a maximum of nine. Results: The sensitivity increases with the number of bilayers deposited; sensitivity of 2.28 mV/%RH was obtained for nine bilayers. The time constant of the response was 1.13 s ± 0.30 s which is faster than the commercial device (measured as 158 s). After calibration, the optical fibre humidity sensor was utilised in a bench top study employing a mechanical ventilator. The fast response time enabled changes in humidity in individual breaths to be resolved. Conclusion: Optical fibre sensors have the potential to be used to monitor breath to breath humidity during ventilator care. Significance: Control of humidity is an essential part of critical respiratory care and the developed sensor provides a sensitive, compact and fast method of humidity monitoring. IEEE 2016-09 Article PeerReviewed Hernandez, Francisco U., Morgan, Stephen P., Hayes-Gill, Barrie R., Harvey, Daniel, Kinnear, William, Norris, Andrew, Evans, David, Hardman, J.G. and Korposh, Sergiy (2016) Characterization and use of a fiber optic sensor based on PAH/SiO2 film for humidity sensing in ventilator care equipment. IEEE Transactions on Biomedical Engineering, 63 (9). pp. 1985-1992. ISSN 0018-9294 Humidity Optical fibers Films Humidity measurement Biomedical measurement Probes Time factors http://ieeexplore.ieee.org/document/7393540/ doi: 10.1109/TBME.2016.2521662 doi: 10.1109/TBME.2016.2521662 |
| spellingShingle | Humidity Optical fibers Films Humidity measurement Biomedical measurement Probes Time factors Hernandez, Francisco U. Morgan, Stephen P. Hayes-Gill, Barrie R. Harvey, Daniel Kinnear, William Norris, Andrew Evans, David Hardman, J.G. Korposh, Sergiy Characterization and use of a fiber optic sensor based on PAH/SiO2 film for humidity sensing in ventilator care equipment |
| title | Characterization and use of a fiber optic sensor based on PAH/SiO2 film for humidity sensing in ventilator care equipment |
| title_full | Characterization and use of a fiber optic sensor based on PAH/SiO2 film for humidity sensing in ventilator care equipment |
| title_fullStr | Characterization and use of a fiber optic sensor based on PAH/SiO2 film for humidity sensing in ventilator care equipment |
| title_full_unstemmed | Characterization and use of a fiber optic sensor based on PAH/SiO2 film for humidity sensing in ventilator care equipment |
| title_short | Characterization and use of a fiber optic sensor based on PAH/SiO2 film for humidity sensing in ventilator care equipment |
| title_sort | characterization and use of a fiber optic sensor based on pah/sio2 film for humidity sensing in ventilator care equipment |
| topic | Humidity Optical fibers Films Humidity measurement Biomedical measurement Probes Time factors |
| url | https://eprints.nottingham.ac.uk/45762/ https://eprints.nottingham.ac.uk/45762/ https://eprints.nottingham.ac.uk/45762/ |