A New Method to Detect Zeolite Breath Sensor Response Based on Low-Power Square-Wave Sources

Gianfranco Carotenuto
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Gianfranco Carotenuto: Institute for Polymers, Composites and Biomaterials, National Research Council, Italy

European Journal of Engineering and Technology Research, 2019, vol. 4, issue 10, 152-154

Abstract: Low-power A.C. generators of square-wave or sinusoidal signals can be used in combination with impedimetric sensors to detect stimuli on the basis of the voltage drop taking place at the sensor electrodes. When a.c. generators with a power of only a few µ-Watts are used, this approach becomes extremely sensitive. A very low-power generator is the LCD back panel driving signal, which has a flipping polarity with a voltage of 3-5Vpp, depending on the generator model. This type of square-wave generator is contained in many low-cost handheld digital multimeters, and it is used as signal tracer to test, for example, low-frequency amplifiers. As an example, this method has been used to acquire a human breath rate pattern, by using a zeolite-based water sensor. If the generator I-V characteristics has been measured, the achieved breath pattern can be converted from a voltage drop vs. time graph to an impedance or current intensity vs. time graph.

Keywords: Breath Sensor; Impedance; Low-Power Square-Wave Generators; Voltage Drop; Zeolite (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:epw:ejeng0:v:4:y:2019:i:10:id:61594

DOI: 10.24018/ejeng.2019.4.10.1594

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