| abstract |
A dermal and cardiovascular spectroscopic sensor includes a number of light-emitting diodes (LEDs) having strategic locations and frequencies, and photo-detectors matched by wavelength of detection for measuring reflections of visible and infra-red light emitted by the LEDs. Spatially resolved spectroscopy is used to determine vital signs of the individual, including pulse sensing, tissue hemodynamics testing, and blood profusion testing. Capacitive and skin contact pads are used for determining that the sensor is being worn and is properly positioned. An accelerometer can be used to determine an activity level for the individual and if a physical mishap has occurred. A temperature sensor can be used to calibrate the digital monitoring device. |