Micro-condensation sensor for monitoring respiratory rate and breath strength
| Autor: | Malgorzata Aneta Janik, Zygmunt Wróbel, Pawel Janik |
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| Rok vydání: | 2012 |
| Předmět: |
Respiratory rate
Chemistry business.industry Acoustics Condensation Metals and Alloys Electrical engineering Condensed Matter Physics Signal Capacitance Surfaces Coatings and Films Electronic Optical and Magnetic Materials Amplitude Breathing Relative humidity Electrical and Electronic Engineering business Instrumentation Sensitivity (electronics) |
| Zdroj: | Sensors and Actuators A: Physical. 185:160-167 |
| ISSN: | 0924-4247 |
| Popis: | Human breath monitoring provides a lot of information about the condition of the body. Respiratory rate which is beyond the norm can be a symptom of a serious disease and an indication for hospitalization. This article presents a sensor which enables monitoring of respiratory rate owing to the change of coupling between input and output electrodes caused by the micro-condensation of vapour particles on the sensor surface in the process of exhaling air. The amplitude of a supplying signal (DC or AC in the range of low frequencies) determines the maximum amplitude of the output signal. The micro-condensation sensor (MCBS) was made in PCB technology and its surface was covered with an available antiseptic which increases MCBS sensitivity to breathing to a great extent. With relative humidity exceeding 75%, the change of the sensor capacitance amounts to 0.5 nF/%RH.The sensor was tested within the frequency range of several to 240 breaths per minute. Such a wide range of frequencies was chosen in order to determine the sensor sensitivity and the speed of its operation in widely different circumstances. |
| Databáze: | OpenAIRE |
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