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UP: Fachverband Umweltphysik

UP 11: Postersession

UP 11.9: Poster

Mittwoch, 19. März 2014, 17:00–18:30, MAG Poster

Custom-designed optical measurement cell for temperature-dependent FTIR measurements of spectral line data — •Anton Serdyukov, Anne Rausch, Viktor Werwein, Jens Brunzendorf, Olav Werhahn, and Volker Ebert — Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany

Accurately determined spectral line parameters are an important input to each atmospheric monitoring activity. It is also important to know the temperature dependency of these parameters because of the broad temperature distribution in the atmosphere.

In the framework of the EMRP project EUMETRISPEC, a measurement cell was developed to allow for infrared measurements of gas samples at well defined environmental parameters – i.e. temperature, pressure and optical path-length. The massive copper body with the custom temperature stabilization design in combination with a refrigerated-heating circulator allows an accurate and stable temperature regulation of the gas sample in the range from -60 to +90^∘C. A special design of the cell windows ensures a reproducible optical path length, independent of varying gas pressures inside the cell.

We report on the cell design and present our first temperature-dependent measurements of carbon monoxide in the 2-0 band in the temperature range from -60 to +23^∘C at 300 mbar.

Acknowledgement: The European Metrology Research Programme (EMRP) is jointly funded by the EMRP participating countries within EURAMET and the European Union.