Gas concentration measurements in the industry as well as in urban areas are becoming increasingly important in light of the current debates. However, the range of measuring systems in this area that are, on the one hand, highly selective and, on the other, robust against environmental influences is limited. Photoacoustic spectroscopy in combination with a static Michelson interferometer for gas concentration measurement offers a viable alternative. Due to the differential behavior of the interferometer, pressure fluctuations are compensated, so that measurements in the gas flow are possible. Any drift of the operating point, which is caused, among other things, by fluctuations in temperature, is compensated by a reference signal. The proof of concept is provided by NO2 measurements with concentrations of up to 500 ppm.
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Gas concentration measurements in the industry as well as in urban areas are becoming increasingly important in light of the current debates. However, the range of measuring systems in this area that are, on the one hand, highly selective and, on the other, robust against environmental influences is limited. Photoacoustic spectroscopy in combination with a static Michelson interferometer for gas concentration measurement offers a viable alternative. Due to the differential behavior of the interf...
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