Abstract: The invention relates to an arrangement for optically determining the distance of a reflecting surface that can be used, in particular, for determining slight variations in distance such as can frequently occur in vibrating systems. Such an arrangement can also be used as optical microphone or hydrophone. The arrangement according to the invention is designed in this case such that light from a light source is directed onto a reflecting surface via a first optical fiber, and light reflected therefrom is directed onto at least one statically arranged optical detector via the first optical fiber or at least one further optical fiber. An optical element collimating in the direction of the reflecting surface is arranged between the reflecting surface and the one or more optical fibers.

Abstract: The invention relates to an arrangement for optically determining the distance of a reflecting surface that can be used, in particular, for determining slight variations in distance such as can frequently occur in vibrating systems. Such an arrangement can also be used as optical microphone or hydrophone. The arrangement according to the invention is designed in this case such that light from a light source is directed onto a reflecting surface via a first optical fiber, and light reflected therefrom is directed onto at least one statically arranged optical detector via the first optical fiber or at least one further optical fiber. An optical element collimating in the direction of the reflecting surface is arranged between the reflecting surface and the one or more optical fibers.

Abstract: The invention relates to a sensor or a microphone having such a sensor. The object of the present invention is to improve the degree of development of the sensor or an optical microphone as an air-borne sound sensor. A sensor consisting of a diaphragm, wherein at least on one side the diaphragm comprises a surface which reflects a light beam, wherein on this side a first optical waveguide is constructed as a transmitting waveguide, through which a light beam passes and strikes against the diaphragm, wherein a second optical waveguide constructed at a specific angular relationship to the first optical waveguide is provided, which has the function of a receiving waveguide and into which light reflected from the diaphragm enters, an optical element is constructed in the light path between the transmitting waveguide and the receiving waveguide, by which the light beam is bunched or focussed.