Sensitive and durable sensors for determination of hydrogen sulfide concentration in the air were developed by chemists of the Voronezh State Technological Academy in collaboration with their colleagues from the Smolensk production association “Analitpribor”. Based on commercially available piesoelectric resonators, these sensors will reliably protect workers’ health by letting know that the poison concentration in the air has approached a dangerous boundary.
At first sight it seems that nature has provided for protection from the harmful gas. A human nose is able to catche hydrogen sulphide (according to the manual’s definition, the substance that strongly reeks) in absolutely tiny quantities when the gas concentration in the air is expressed in the thousandths of milligram per cubic meter. But the paradox is that this particular sensitivity of the nose can let us down: when the hydrogen sulphide concentration is approaching the maximum allowable value impending chronic desease of respiratory tract, blood, eyes, skin and digestive apparatus, the smell seems weaker to us. This is a kind of olfactory illusion.
The device developed by the Voronezh chemists will help to fight this illusion. It should be noted that researchers from the group under the guidance of Professor Yakov Kornman have learned to produce quite a variety of sensors based on microweighing of the air mixture analyte. They are based on the so-called piesoelectric resonators. These are devices the main component of which is a quartz plate covered by a special layer, vibrating at a strictly determined frequency under the influence of imressed voltage.
Sergey Komarov | alfa
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