FIELD: analysis of matters. SUBSTANCE: microwave energy is generated at least at single frequency which has to be monotonously changed according to harmonic law. Central frequency of scanning range is matched with center of absorption line of the gas to be analyzed. Gas concentration is judged from amplitude of the second harmonic of alternating signal of absorption detector. Value of contribution of absorption lines of the disturbing components is judged from amplitude of the first harmonic. EFFECT: improved precision. 5 dwg
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