Gas detection method and gas detection device

摘要: The gas detector device comprises at least a VCSEL source and light sensor for detecting beam having passed through sample chamber containing given to be detected. detection signal of the directly provided or is time derivated by an electronic derivator then respective lock-in amplifiers in order generate two different 2f-detection, f being frequency wavelength modulation source, thus provide corresponding measuring signals division which gives precise value concentration. invention uses first reference twice second laser source. Providing 2f has advantages over prior art, because using such it possible measure absolute intensity therefore receive same result temperatures mode hopping laser. A further advantage that measurement accuracy independent from