Sensor for detecting pressure fluctuations in a flowing fluid, and measurement system formed therewith

A sensor for detecting pressure fluctuations in a Kármán vortex street formed in a flowing fluid, the sensor comprising:

• a deformation element, which is membrane-like or disk-shaped, flat at least in sections, and made of a metal, including a planar first surface and an opposite planar second surface;
• a sensor lug, which is rod-shaped, planar or wedge-shaped, extending from the first surface of the deformation element;
• a connection sleeve made of a metal, which extends from the deformation element and is connected thereto in an electrically conductive manner;
• a transducer element, which is piezoceramic and at disk-shaped, disposed within the connection sleeve and contacting the second surface of the deformation element with a first contact surface in an electrically conductive manner as to generate an electrical sensor signal representing temporally changing, and at least temporarily periodic, movements of the sensor lug and/or temporally changing, and at least temporarily periodic, deformations of the deformation element;
• and
• and a fastener disposed within the connection sleeve and releasably, mechanically connected thereto and configured to releasably, fix the transducer element in the connection sleeve, wherein the fastener comprises a cylindrical spring assembly formed of at least two stacked disk springs, and
• wherein the disk springs are adapted to elastically deform by exerting a pressing force, which holds the transducer element against the deformation element, such that a minimum surface pressure acting on the transducer element is more than 1 MPa and/or a maximum surface pressure acting on the transducer element is less than 20 MPa, and/or such that a non-positive connection is formed between the transducer element and the deformation element.