IR Absorption Spectroscopy

Infrared Spectroscopy is principle for organic and inorganic chemistry analysis using infrared light interacting with a molecule. Infrared spectroscopy exploits the fact that molecules absorb specific wavelength of the light that are characteristic of their structure. Selected molecules have specific resonant frequencies where the absorption of radiation with proper wavelength is significantly higher in comparison to other part of spectra. Level of the absorption on given wavelength can be precisely measured and recalculate to amount of the substance of interest. By transmitting a beam of IR radiation through the air , or through any particular gas volume, and recording how much is transmitted at selected spectral lines, one may decide which gases are present and how much of each.

Most gases have their characteristic spectra in the infrared specturm. Those spectra derive from the molecule’s composition in such a way that no two molecular gases have the same IR spectrum. IR spectra are the fingerprints of gases, and thus allow gases to be uniquely identified.

IR wide spectrum radiation is passing through the gas column. On the same time the sampled gas is transported through the tube.

The Infra Red analyses, used in our products are unique in the field of extremely short analytical tube (just 80 mm), combined with highly sophisticated analogue and software signal processing technology, capable to extract the “invisible” signal from the surrounding noise level. This solution, originally applied in radar signal detection technologies, allows to use extremely small, short analytical tube to achieve the real detection limit in hundreds of ppm level.

The special selection of the individual IR sensors and customer-made sensor selective filter (as for the group of petroleum hydrocarbons, carbon dioxide, N2O, H2S and precise reference channel and unique, Methane measuring channel, which spectral line located at the wavelength, where other IR sensor do not operate), enables our new system to achieve the extreme sensitivity in this size of instrument case and, also, the unique capability of the IR section to provide exclusive and sharp selectivity for the Methane gas, existing in the wide spectrum range of other organic compounds. Optional H2S and N2O channels enables the system for application in the very specifiic environmental investigation projects.

There is the additional advantage of our new IR system solution that can be found in the signal processing and analogues system dynamic range. Our IR measuring channels work in the huge dynamic range from unbelievable hundreds of ppm to 500 000 ppm without changing the measuring range, that is absolutely unique in the field of portable instruments. This unique feature enables to make the measurements of soil sampled gas simultaneously and, what is more important, in one sampling, without necessity to repeat the measurement, if the measuring range of (other) instrument would be selected improperly. “One shoot” measurement is extremely important in working in non-permeable soils, where the real amount of the gas sample is very limited and can not be available for repeated measurement (with different measuring range). This feature makes the ECOPROBE system still unbeatable and very popular in the real field use.

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