Fig. 5: Application of the HyperspecI sensor for blood oxygen and water quality monitoring.
From: A broadband hyperspectral image sensor with high spatio-temporal resolution
a, The prototype of the HyperspecI sensor for blood oxygen saturation (SpO2) monitoring. b, i, The transmission spectra through the finger were obtained at a collection rate of 100 Hz. ii, Two photoplethysmography (PPG) signals at 780 nm and 830 nm, corresponding to two bands with different intensities of HbO2 and Hb absorption. The blood oxygen saturation can be accurately determined by analysing and calibrating the PPG signals at these two characteristic bands. iii, Comparative analysis with a commercial oximeter product demonstrates a high level of consistency in the obtained results. c, Three exemplar frames of HyperspecI measurements demonstrating the solution diffusion process, accompanied by the corresponding images captured using an RGB camera. In the petri dish, solution 1 was positioned at the top left corner, and solution 2 was placed at the bottom left corner. These two solutions were added to distilled water at the top right corner. Hyperspectral images acquired by the HyperspecI sensor are presented in the synthesized RGB format. d, Comparison of segmentation maps between an RGB camera (left) and the HyperspecI sensor (right). a.u., arbitrary units.
