Figure 2
From: Low Cost Inkjet Printed Smart Bandage for Wireless Monitoring of Chronic Wounds
Sensor designs.
Two sensor electrodes are mounted on the top and the bottom side of the bandage forming a capacitor. (a) The bleeding is sensed when the blood from the wound penetrates into the bandage and changes the dielectric constant to εr1 which is greater than εr. (b) The external pressure is sensed when the pressure changes the distance between the electrode to d1 which is less than d. (c) The pH levels are sensed when the resistance of the carbon based bottom electrode changes in response to pH.
