A sensor for detecting pressure fluctuations in a fluid, the sensor comprising:
- a deformation element which is flat at least in sections, generally disk-shaped, and made of a metal, including a planar first surface and an opposite planar second surface;
- a connection sleeve extending from the deformation element and connected thereto in an electrically conductive manner, wherein the connection sleeve is made of a material having a first thermal expansion coefficient of not less than 16·10−6 K−1 and/or not more than 17·10−6 K−1 at least within a temperature range of −10° C. to 250° C.;
- a generally disk-shaped, piezoceramic transducer element which is disposed within the connection sleeve, electrically conductively contacts the second surface of the deformation element with a first contact face, and is made of a material having a second thermal expansion coefficient of not less than −6·10−6 K−1 and/or not more than 6·10−6 K−1 at least within a temperature range of −10° C. to 250° C.,
- wherein the transducer element is configured to generate an electric sensor signal representing deformations of the deformation element, which change over time and are at least temporarily periodic, and/or is configured to generate a force effecting deformations of the deformation element;
- and
- fastening means disposed within the connection sleeve and at least partially, releasably, mechanically connected thereto and configured to releasably fix the transducer element in the connection sleeve,
- wherein the connection sleeve includes an internal thread in a distal end remote from the deformation element,
- wherein the fastening means include:
- an inner threaded sleeve including an external thread;
- and
- a cylindrical, monolithic, and/or disk-shaped add-on element made of a metal and/or of a material having a third thermal expansion coefficient of not less than 20·10−6 K−1 and/or not more than 30·10−6 K−1 at least within a temperature range of −10° C. to 250° C.,
- wherein the threaded sleeve is screwed into the internal thread of the connection sleeve, with the add-on element disposed between the threaded sleeve and the transducer element, such that an abutment for the add-on element is formed by the threaded sleeve and such that at least the add-on element is elastically deformed by exerting a contact pressing force that holds the transducer element pressed against the deformation element or is elastically deformed by forming at least a frictional connection that connects the transducer element and the deformation element to each other, in particular such that a minimum surface pressure acting between the add-on element and the transducer element or between the transducer element and the deformation element is more than 1 MPa, and/or a maximum surface pressure acting between the add-on element and the transducer element or between the transducer element and the deformation element is less than 20 MPa, and/or such that a frictional connection is formed between the transducer element and the deformation element.