Patent ID: 8875558

Claim:
A system for determining exhaust gas volume for a stationary or mobile device, comprising: a number of Bragg gratings arranged distributed at specified positions transverse to a direction of flow of an exhaust gas in an exhaust gas duct of the device; an optical waveguide structure, in which the Bragg gratings are embodied, the optical waveguide structure including at least one optical waveguide; at least one light source configured to beam light into the optical waveguide structure; at least one signal processing device, configured to establish a speed of flow of the exhaust gas along a course of the optical waveguide structure from light scattered back from the Bragg gratings in the optical waveguide structure opposite to its original direction of propagation; and at least one of a heating device, arranged adjacent to the Bragg gratings, through which the Bragg gratings are heatable to a temperature above the exhaust gas temperature, wherein a heat power to be output by the heating device is able to be adapted to the exhaust gas temperature, and a cooling device arranged adjacent to the Bragg gratings by which the Bragg gratings are coolable to a temperature below the exhaust gas temperature, the at least one signal processing device being configured to determine a flowing exhaust gas volume from the established flow speed of the exhaust gas determined along the course of the optical waveguide structure.