The technology of covering of IR sources with high emissivity materials was worked out. Platinum black was electrodeposited from H2PtC16 solution on platinum foil. The current densities from 0.1 to 5 mA/mm2 and the deposition time from 1 to 15 minutes were employed. The microstructures of platinum black were examined using scanning electron microscopy. For the current densities below 1 niA/mm2 the island structures were received. For the current densities from 1 to 2 mA/mm2 first the island structure arises, next it changes to the sponge structure. For the current densities above 2 mA/mm2 only the sponge structures were observed. For the island structures multiple increases of emissivity coefficient were discovered. Instead, for the sponge structures the increase of emissivity coefficient was much lesser. The value of emissivity coefficient for examined covers was about 0.8 at temperature 1000°C. For the obtained IR sources stable work without changing the parameters is possible for the temperature up to 800°C.
The obj ective of this work consists in working out of a detection module for capnography (carbon dioxide concentration measurement in anaesthesiology and intensive care). The principle of operation of the module consists of the NDIR method. The basic assumption for construction ofthis model was using of directly modulated thermal JR source in it. A few models of JR sources were worked out. Their heaters were made from thick platinum layers and foil. Limits of modulation frequency for JR sources were greater than 30 Hz.The detection module consists of an optical part, analogue electronics and microprocessor system with a suitable program. The time dependent concentration of C02, end tidal concentration of C02, mean concentration of N20 and breath frequency are output values of the detection module. Measurements are executed 30 times per second. The accuracy of CO2 concentration measurement equals to 5%.
The output signal generated by detectors used in ion mobility spectrometry (IMS) is a time-dependent, small ionic current. To be able to take full advantage of information contained in this signal, adequate procedures of signal processing need to be utilized. Methods of spectrum filtration, peak separation, base-line correction as well as one-and twodimensional integration applied in quantitative analysis are described. The effectiveness of the chosen methods was demonstrated on examples of experimental results obtained by IMS. Measurements were performed for spectra of reactant ions and sample ions generated by acetone, methyl tert-butyl ether (MTBE), dimethyl methylphosphonate (DMMP) and benzene. It was demonstrated that the proposed methods considerably improve the quality of the spectra, increase the selectivity of detection and reduce the uncertainty of quantitative measurements.
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