Selective determination of hydrogen by temperature modulation of a semiconductor sensor
Abstract
There are practical tasks for the selective determination of hydrogen using compact, inexpensive sensor analyzers capable of operating offline for a long time in hard-to-reach places. However, there are currently no highly selective hydrogen sensors, and electronic nose devices that allow for qualitative and quantitative analysis using a set of several low-selective sensors consume a lot of electricity and require the use of a computer for data processing. The task of selective detection can be solved using a single sensor, which is low-selective in stationary mode, but with temperature modulation allows the gas analytes to show their individuality.
The transition from stationary mode to temperature modulation leads to the transformation of the sensory response from a scalar value to a vector one. Methods such as PCA (principal component analysis) or MLP (multilayer perceptron) are successfully used to process arrays of vector data, but their implementation requires fairly powerful microprocessors. Meanwhile, to create inexpensive compact gas analyzers, it is more rational to use less productive but more energy-efficient microcontrollers. Thus, the task arises of creating a simple algorithm for processing vector data that can be implemented in a standard microcontroller with limited computing capabilities.
In this paper, experimental data were obtained on the temperature modulation of a semiconductor gas sensor based on SnO2 with the addition of 3% palladium in the form of PdO in a hydrogen medium of various concentrations, as well as in other gaseous media. All the data was divided into two groups – a training sample was compiled from the first group, and the second group was reserved for tests. The concentrations of gases in the two samples did not match – this was done in order to complicate the task of selective analysis.
The algorithm we developed made it possible to solve the problem of selective gas detection without errors – all test experiments gave correct answers to the questions of qualitative analysis.
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References
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