A developed method and measurement setup for measurement of noise generated in a supercapacitor is presented. The requirements for noise data recording are considered and correlated with working modes of supercapacitors. An example of results of low-frequency noise measurements in commercially available supercapacitors are presented. The ability of flicker noise measurements suggests that they can be used to assess quality of tested supercapacitors.
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.