Long-period grating fiber-optic sensors of bending for applications in pulmonology

Abstract

U ovom radu predstavili smo fiber-optički senzor krivine na bazi rešetke sa dugim periodom i njegovu primenu u praćenju disanja pri mehaničkoj ventilaciji pacijenata. Predložena šema merenja koristi monohromatski izvor svetlosti i fotodiodu kao detektor što je čini ekonomičnom i jednostavnom za upotrebu. Ovde smo demonstrirali primenu senzora u merenju disajnih zapremina koja se zasniva na korelaciji izmenu promene zapremine pluća i promene lokalne krivine torza. Poređenjem rezultata studije na skupu od 15 zdravih dobrovoljaca sa konkurentnim metodima zaključujemo da je predloženi neinvazivni metod pogodan za kliničku praksu.Here we present a fibre-optic sensor of bending and demonstrate its application in monitoring of assisted breathing. The sensor is based on a long-period fibre grating and uses a simple monochromatic interrogation scheme. Here, we first explain the working principle of the sensor and then present a method for the measurement of respiratory volumes. The measurement is based on the correlation between a change in lung volume and the corresponding change in a local torso curvature. We validate the method by applying a calibration-test measurement procedure on a set of 15 healthy volunteers. Results show good sensor accuracy in measurements of the tidal and minute respiratory volumes for clinically relevant types of breathing. Finally, we compare the proposed method with the current clinical standards and competing techniques