Szczegóły

Tytuł artykułu

Portable exhaled breath analyzer employing fluctuation-enhanced gas sensing method in resistive gas sensors

Tytuł czasopisma

Metrology and Measurement Systems

Wolumin

vol. 25

Numer

No 3

Autorzy publikacji

Słowa kluczowe

resistance gas sensor ; fluctuation enhanced sensing ; flicker noise ; gas detection ; breath sample collection

Wydział PAN

Nauki Techniczne

Zakres

551–560

Abstrakt

This paper presents a portable exhaled breath analyser, developed to detect selected diseases. The set-up

employs resistive gas sensors: commercial MEMS sensors and prototype gas sensors made of WO3 gas

sensing layers doped with various metal ingredients. The set-up can modulate the gas sensors by applying

UV light to induce physical changes of the gas sensing layers. The sensors are placed in a tiny gas

chamber of a volume of about 22 ml. Breath samples can be either injected or blown into the gas chamber

when an additional pump is used to select the last breath phase. DC resistance and resistance fluctuations

of selected sensors using separate channels are recorded by an external data acquisition board. Low-noise

amplifiers with a selected gain were used together with a necessary bias circuit. The set-up monitors other

atmospheric parameters interacting with the responses of resistive gas sensors (humidity, temperature, atmospheric

pressure). The recorded data may be further analysed to determine optimal detection methods.

Wydawca

Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation

Data

2018.10.01

Typ

Artykuły / Articles

Identyfikator

ISSN 0860-8229

DOI

10.24425/123892

×