期刊
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
卷 63, 期 9, 页码 1985-1992出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TBME.2016.2521662
关键词
Critical care; Fabry-Perot; humidity sensor; intensive care unit; layer-by-layer (LbL); optical fiber sensor; relative humidity
资金
- Invention for Innovation Programme of the National Institute of Health Research (NIHR, UK) [NIHR i4i II-LA-0813-20008]
- National Council of Science and Technology of Mexico (CONACyT)
- Ministry of Public Education in Mexico (DGRI-SEP)
- National Institute for Health Research [II-LA-0813-20008] Funding Source: researchfish
- National Institutes of Health Research (NIHR) [II-LA-0813-20008] Funding Source: National Institutes of Health Research (NIHR)
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.
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