An optical device having an optical circuit integrated on a side of a substrate having a column of substrate material. A continuous shooting speed of the digital photographing apparatus may be improved by simultaneously performing a shutter operation and a read out operation of image data. The second gas line is adapted to take up gas from the surroundings of the measuring location, that may contain a test gas background that is to be taken into consideration when detecting the test gas taken up at the measuring location. Said composite body is inserted between an area of the electric circuit and the electric insulator, said area being intended for supporting the electronic power component.