NDIR-GERÄT UND VERFAHREN ZUR MESSUNG VON ISOTOPENVERHÄLTENISSEN IN GASPROBEN

摘要

An apparatus for measuring isotopic ratios provides four separate optical paths for separate measurement of each of two isotopes relative to a reference signal, using spectrally resolved infrared radiation. The design permits the measurements to be made accurately without significant time lags between measurements, and without interchanging of cells or filters.