A new system of retroreflectors for methanometry of extended sources

Past, new and future metrological applications in the area of methanometry for mining and environment show the necessity of developing wider metrological basis for methane emission from extended sources. Some solutions and tendencies developed in parallel in GIG and in the world are presented in the paper. A plane set of changing geometry approximating spherical mirrors of different radii is proposed. The visual results of introductory comparative tests are also presented.