An apparatus and method for attaching a tube member to a housing of a vacuum brake booster is provided. The combustion apparatus includes a fuel reservoir storing fuel therein, and a main body connected to the fuel reservoir by a flexible tube. The wiper blade adapter includes a first adapter element on the wiper-arm side and a second adapter element on the wiper-blade side, which are arranged pivotably with respect to one another in an axis. The mobility spectrum is measured by correlating the ion current measured at the detector and the modulation function.