Spectral and static noise characteristics of semiconductor gas sensors in equiresistance conditions

Noise of semiconductor gas sensors in response to a sharp change in the composition of the gaseous phase

“…Figures 1 and 2 show several noise oscillograms for an amplification of 1200 times, which were obtained under the above-described conditions. The constant component in the oscillograms is related to the fact that to remove it, the input amplifier needs balancing for each range of the input resistance, which cannot be accomplished in this experiment since the specimen resistance was changed by almost an order [4,5]. Figure 1 shows the noise oscillograms after annealing in the oxidizing environment (air) and its replacement by the reducing environment (mixture of argon and H 2 ).…”

“…When the resistance drift was slower than 10-15 % per minute, the unit for measuring noise was The output voltage of the instrument amplifier is plotted on the vertical axis. The detailed diagram for measuring low-frequency noise is presented in [4,5]. In a first approximation, we assume that the amplitude of voltage fluctuations is proportional to the amplitude of conductance fluctuations of the gas-sensitive layer.…”

“…In [1][2][3], the noise characteristics of the GSSs were measured [4] after a long (over 3-4 h) holding in the analyzed gaseous mixture [5]. In this paper, we study the GSS noise immediately after a change in the composition of the gaseous phase, namely, when pronounced nonstationarity was observed in the GSS noise.…”

“…The prior studies [1][2][3] show the influence of chemisorption on the spectral and statistical characteristics of low-frequency current noise of metal-oxide gas-sensitive structures (GSSs). In [1][2][3], the noise characteristics of the GSSs were measured [4] after a long (over 3-4 h) holding in the analyzed gaseous mixture [5].…”

A study of Gaussianity and stationarity of noise in gas-sensitive SnO2 films

“…Experiments were conducted in a special automated laboratory complex allowing us to study both sensor and noise characteristics of the gas-sensitive layers in different gas mixtures [9]. Noise was measured at temperatures ranging from 20 to 400 • C in the frequency range 1-200 Hz.…”