GAS ANALYSIS APPARATUS AND METHOD

摘要

A proposed gas analysis apparatus (1) comprises a gas sample cell (lO) having a gas inlet (11) and a gas outlet (12) allowing the input and output of gas to be analyzed and a radiation inlet (13) and a radiation outlet (14) allowing the input and output of electromagnetic radiation, said gas sample cell (10) employing rotational spectroscopy and comprising a hollow waveguide (15) containing said gas and guiding electromagnetic waves of said radiation. A radiation generator (20) generates frequency modulated radiation in a millimeter and/or submillimeter wavelength range. A radiation transmitter (3) transmits a radiation signal generated by said radiation generator (20) into said gas sample cell (10) via said radiation inlet. A radiation receiver (40) receives a radiation signal from said gas sample cell (10) via said radiation outlet (14) and mixes the received radiation signal with a delayed transmitted radiation signal to obtain an output signal for performing a spectral analysis. Finally, an output signal is output by said radiation receiver (40) for performing a spectral analysis.