Enhanced non-contact and continuous sensing of periodic bio-signs: Extending sensor's temporal bandwidth

Laser based photonic non-contact sensor can be used for continuous sensing of periodic vital bio signs by analyzing the temporal changes of the spatial back scattered secondary speckle patterns. This analysis allows extraction of nanovibrations of the inspected tissue (surface and in-depth) and associate it with various vital bio-signs. One of limitations for this type of sensing is the temporal bandwidth of the analyzing camera. It's number of frames per second limits the maximal temporal bandwidth of the biological signals that can be sensed. I will show how to increase the temporal bandwidth in two ways. First by encoding the illuminating laser with orthogonal convolution codes-based patterns and using the fact that the to be sensed biological signals are periodic, in order to allow a significant enhancement of the bandwidth of the camera aiming to overcome the limiting factor induced by its low sampling rate. Second, I will show how sampling rate could be reduced when sensing blood flow-based bio-signs and by converting the temporal signals that are to be sensed into space. In the overall the proposed enhancements allow using much simpler sensors/cameras for extraction of biomedical information included in much higher temporal frequencies which can be much more informative for biomedical diagnosis and analysis.