Patent ID: 9188534
Filing Date: 2015-11-17
Classification: G01N

Abstract:
1. A device for the optical detection of a target gas in gas mixtures, the device comprising: an operating and analyzing unit; a measuring cuvette comprising a multireflection measuring cuvette with optically reflecting surfaces on the inner walls and a gas inlet to exchange gases and gas mixtures with a measurement environment; a radiation source, which emits light into the measuring cuvette; a measuring detector provided at the measuring cuvette; a reference detector unit provided at the measuring cuvette, wherein the measuring detector and the reference detector unit detect the light of the radiation source and produce electrical signals, which correspond to the intensity of the detected light; an optical band pass filter element, designed to transmit light of a measurement wavelength, arranged in front of the measuring detector; and an optical double band pass filter unit, designed to transmit light of a first reference wavelength and light of a second reference wavelength, arranged in front of the reference detector unit, wherein: the operating and analyzing operates the radiation source and receives the electrical signals of the measuring detector and of the reference detector unit; the operating and analyzing unit determines a target gas concentration with compensation of the effect of moisture present based on a determination of a moisture effect signal reduction in each of the signals belonging to the measurement wavelength and the first reference wavelength and the second reference wavelength.