Abstract: A machine has at least two wheels (at least one of them driven) arranged on a base body and connected with a revolving belt. A transmitter and a receiver are arranged on the base body. The transmitter transmits contactless to the belt a transmitted signal having an oscillation frequency, with the receiver from the belt a reflected signal in response to the transmitted signal. An evaluation device connected to the receiver checks if the reflected signal received by the receiver satisfies an acquisition condition indicating that a speed of the belt is in a predetermined speed range. The evaluation device determines, if the acquisition condition is satisfied, a frequency spectrum which is based of the oscillation frequency and the reflected signal in the predetermined speed range and indicative of a mechanical oscillation characteristic of the belt, and generates a control signal based on the evaluated frequency spectrum.

Abstract: A machine has at least two wheels (at least one of them driven) arranged on a base body and connected with a revolving belt. A transmitter and a receiver are arranged on the base body. The transmitter transmits contactless to the belt a transmitted signal having an oscillation frequency, with the receiver from the belt a reflected signal in response to the transmitted signal. An evaluation device connected to the receiver checks if the reflected signal received by the receiver satisfies an acquisition condition indicating that a speed of the belt is in a predetermined speed range. The evaluation device determines, if the acquisition condition is satisfied, a frequency spectrum which is based of the oscillation frequency and the reflected signal in the predetermined speed range and indicative of a mechanical oscillation characteristic of the belt, and generates a control signal based on the evaluated frequency spectrum.

Abstract: An interferometric measuring device includes a reference arm having a reference surface and a measuring arm having lighting optics for deflecting measuring light onto a measuring surface of an object to be measured, and having an image recorder connected to an analyzing device. A rapid, simple measurement with a rugged design of the measuring device may be achieved by configuring the lighting optics as a light guide body insertable into a cavity in the object to be measured, having a peripheral, radially symmetrical effective reflex surface directed radially or obliquely outward, and also including at least one deflector surface deflecting the measuring light onto same.

Abstract: An interferometric measuring device includes a reference arm having a reference surface and a measuring arm having lighting optics for deflecting measuring light onto a measuring surface of an object to be measured, and having an image recorder connected to an analyzing device. A rapid, simple measurement with a rugged design of the measuring device may be achieved by configuring the lighting optics as a light guide body insertable into a cavity in the object to be measured, having a peripheral, radially symmetrical effective reflex surface directed radially or obliquely outward, and also including at least one deflector surface deflecting the measuring light onto same.