Wearable FBG strain flexibility in supplemental oxygen-assisted respiratory examination

Subtle sensing is one of the important aspects required in the performance of modern medical technology, especially the detection of elusive human respiratory risks. In this regard, the fiber Bragg grating (FBG) sensor offers a high-sensitivity measurement of supplemental oxygen-assisted human respiratory characteristics through a strain approach. The FBG wavelength of 1550 nm is induced by nasal airflow and back-body surface on resting and active objects. The treated FBG will undergo deformation resulting in a change in the Bragg wavelength, which is then measured using an optical sensing interrogator and processed to obtain the strain value. The measurement results show significant FBG strain values at the micro-scale. The addition of oxygen flow in the body can increase the stretch that occurs during breathing. Therefore, the FBG sensor is more effectively used in conditions with the addition of oxygen flow.