A measuring arrangement for detecting deformations, in particular bending of the outer surface, of a structural element (12, 14, 15, 16) of a wind turbine, wherein the structural element is a rotor blade of the wind turbine, comprising: at least three, preferably at least five, measurement sites arranged on the structural element (12, 14, 15, 16) and being spaced apart from one another in the direction of the longitudinal extension of the structural element and each having at least one acceleration sensor, wherein the acceleration sensors can be communication-connected - preferably via a wireless interface - to an evaluation device, characterized in that the measuring arrangement has at least two speed sensors, in particular angular speed sensors, arranged on the structural element and spaced apart from one another in the direction of the longitudinal extension of the structural element, and/or that the measuring arrangement has at least two position sensors, in particular magnetic field sensors, arranged on the structural element and spaced apart from one another in the direction of the longitudinal extension of the structural element, wherein the measurement sites each have at least one speed sensor and/or at least one position sensor - in addition to the acceleration sensor -, and wherein the speed sensors and/or the position sensors can be communication-connected to the evaluation device - preferably via a wireless interface, and that at least one, preferably at least two, of the measurement sites is/are arranged in the region of the rotor blade tip and/or at a distance from the rotor blade tip, which distance is at most as great as 20 % of the total length of the rotor blade, and that at least one measurement site is arranged away from the connecting line between the outermost measurement sites of the measuring arrangement, preferably between the measurement site closest to the rotor blade root and the measurement site closest to the rotor blade tip, wherein preferably the normal distance from the connecting line amounts to at least 20 cm, preferably at least 50 cm, and/or at least 0.5 %, preferably at least 1 %, of the longitudinal extension of the structural element, and/or that at least one measurement site is arranged on a first side, in particular the front side, of the structural element, and at least one measurement site is arranged on a second side opposite the first side, in particular on the rear side, of the structural element. at least three, preferably at least five, measurement sites arranged on the structural element (12, 14, 15, 16) and being spaced apart from one another in the direction of the longitudinal extension of the structural element and each having at least one acceleration sensor, wherein the acceleration sensors can be communication-connected - preferably via a wireless interface - to an evaluation device, characterized in that the measuring arrangement has at least two speed sensors, in particular angular speed sensors, arranged on the structural element and spaced apart from one another in the direction of the longitudinal extension of the structural element, and/or that the measuring arrangement has at least two position sensors, in particular magnetic field sensors, arranged on the structural element and spaced apart from one another in the direction of the longitudinal extension of the structural element, wherein the measurement sites each have at least one speed sensor and/or at least one position sensor - in addition to the acceleration sensor -, and wherein the speed sensors and/or the position sensors can be communication-connected to the evaluation device - preferably via a wireless interface, and that at least one, preferably at least two, of the measurement sites is/are arranged in the region of the rotor blade tip and/or at a distance from the rotor blade tip, which distance is at most as great as 20 % of the total length of the rotor blade, and that at least one measurement site is arranged away from the connecting line between the outermost measurement sites of the measuring arrangement, preferably between the measurement site closest to the rotor blade root and the measurement site closest to the rotor blade tip, wherein preferably the normal distance from the connecting line amounts to at least 20 cm, preferably at least 50 cm, and/or at least 0.5 %, preferably at least 1 %, of the longitudinal extension of the structural element, and/or that at least one measurement site is arranged on a first side, in particular the front side, of the structural element, and at least one measurement site is arranged on a second side opposite the first side, in particular on the rear side, of the structural element.