Nonlinear Flow Sensor Calibration with an Accurate Syringe

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art_BISELLI_Nonlinear_Flow_Sensor_Calibration_with_an_Accurate_Syringe_2018.PDF (1.2 MB)
Citações na Scopus
9
Tipo de produção
article
Data de publicação
2018
DOI
Scopus
Web of Science
PubMed
Título da Revista
ISSN da Revista
Título do Volume
Editora
MDPI
Autores
Citação
SENSORS, v.18, n.7, article ID 2163, 9p, 2018
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
Flow sensors are required for monitoring patients on mechanical ventilation and in respiratory research. Proper calibration is important for ensuring accuracy and can be done with a precision syringe. This procedure, however, becomes complex for nonlinear flow sensors, which are commonly used. The objective of the present work was to develop an algorithm to allow the calibration of nonlinear flow sensors using an accurate syringe. We first noticed that a power law equation could properly fit the pressure-flow relationship of nonlinear flow sensors. We then developed a software code to estimate the parameters for this equation using a 3 L syringe (calibration syringe). Finally, we tested the performance of a calibrated flow sensor using a different 3 L syringe (testing syringe) and a commercially available spirometer. After calibration, the sensor had a bias ranging from -1.7% to 3.0% and precision from 0.012 L to 0.039 L for volumes measured with the 3 L testing syringe. Calibrated sensor performance was at least as good as the commercial sensor. This calibration procedure can be done at the bedside for both clinical and research purposes, therefore improving the accuracy of nonlinear flow sensors.
Palavras-chave
flow sensor, calibration, mechanical ventilation, nonlinear
URI
https://observatorio.fm.usp.br/handle/OPI/29354
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Coleções
Artigos e Materiais de Revistas Científicas - FM/MCM
Artigos e Materiais de Revistas Científicas - HU
Artigos e Materiais de Revistas Científicas - LIM/51