Development of prototype of electronic speckle interferometry based spirometer

R. Arun Kumar (Author), R. Sunil Kumar (Author), Vimal Raj (Author), Mohanachandran Nair Sindhu Swapna (Author), Sankaranarayana Iyer Sankararaman (Author)

Abstract

The paper reports the design, construction, and calibration of the prototype of a spirometer based on electronic speckle interferometry (ESPI). The conventional ESPI setup is modified by incorporating a DNM (Diaphragm-Nozzle-Mouthpiece) module comprising a metallic diaphragm, regulated airflow channel, and a mouthpiece. The exhaled air after a deep breathe is channelled to the DNM module where the diaphragm gets deformed. From the circular fringe pattern obtained by subtracting the speckled images before and after deformation of the metallic diaphragm, the radius of curvature (R) due to deformation is calculated using the principle of Newton’s rings. The value of R and peak expiratory flow rate (PEFR) from the standard spirometer reading are correlated. From the 640 observations spread over the range 100 - 500 L/min in the standard spirometer, an empirical relation is set in terms of R from the scatter plot. The ESPI spirometer (ESPIS) is validated by determining the value of R corresponding to a particular PEFR from the empirical relation and also from the standard spirometer. The PEFR calculated from ESPIS matches well with the standard spirometer reading, which suggests that the system designed and constructed can be used for biomedical applications for assessing lungs’ efficiency.

Keywords

speckle;spirometer;DNM module;ESPIS;peak expiratory flow rate;

Data

Language:	English
Year of publishing:	2021
Typology:	1.01 - Original Scientific Article
Organization:	UNG - University of Nova Gorica
UDC:	535
COBISS:	112986883
ISSN:	0143-8166
Views:	503
Downloads:	0
Average score:	0 (0 votes)
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Other data

URN:	URN:SI:UNG
Type (COBISS):	Not categorized
Pages:	str. 1-6
Issue:	ǂVol. ǂ136
Chronology:	2021
DOI:	10.1016/j.optlaseng.2020.106318
ID:	15766870