METHOD, SENSOR AND DEVICE TO SENSE BREATHING

摘要

A method, a device and a sensor to sense the breathing of a man or an animal. A breathing sensor which in an optical way detects changes in deposited moisture on a sensor portion is placed in the breathing air flow and changes of transmitted or reflected optical signal dependent on the deposited moisture is sensed as a measure of the breathing. A sensor according to the invention may consist of an optical fibre, one end surface of which constitutes a sensor surface and reflects a signal in the fibre to a varying degree dependent on mist deposited by the breathing air flow on the sensor surface.