sensor diagram (IMAGE)

SingHealth

sensor diagram

Caption

Illustration of the technical process of monitoring and detection of blood by the BWATCH device. (A) Device placed over a dressing. (B) When moisture is present in the dressing, a change in capacitance is detected and the green light emitting diose (LED) is activated. (C) Haemoglobin (Hb) in the blood absorbs 525nm wavelength light. When the light sensor does not detect 525nm light, the alarm is triggered. (D) With other fluids (non-blood), the light sensor detects 525nm and no alarm is triggered.

Credit

Changi General Hospital

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