Abstract: The invention essentially consists of a system (1) for transmitting acoustic power, which will determine the optimum frequency and the optimum electrical load without data communication being established beforehand with the receiver (3).

Abstract: A method for determining the state of at least one sensor, the method using a first electromechanical transducer and a second electromechanical transducer that are coupled to a substrate, and a non-linear electrical circuit connected between the second electromechanical transducer and the sensor, the method comprising the steps of: applying an electrical signal at a first amplitude to the terminals of the first electromechanical transducer, and determining a first set of values of a parameter characteristic of the electrical impedance of the first electromechanical transducer in response to the application of the electrical signal; applying the electrical signal at a second amplitude to the terminals of the first electromechanical transducer, and determining a second set of values of the parameter characteristic of the impedance; measuring a difference between the first set of values and the second set of values; determining a state of the sensor on the basis of the difference between the first set of values

Abstract: The invention essentially consists of a system (1) for transmitting acoustic power, which will determine the optimum frequency and the optimum electrical load without data communication being established beforehand with the receiver (3).

Abstract: A device for converting mechanical energy into electrical energy including a support (2), a structure (S1) suspended to the support through embedding by a first longitudinal end (4.1) and including a mass (M) fastened to a second longitudinal end (4.2), two layers of piezoelectric material (12, 14) extending between the first longitudinal end (4.1) and second longitudinal end (4.2) of the structure (S1) and disposed so that, when the mass (M) moves, the layers are flexurally deformed, electrodes (E1, E2) on either side of the layer of piezoelectric material (12, 14), wherein the structure (S1) includes transverse elements (16, 18) integral with the layers of piezoelectric material (12, 14) extending transversely relative to the longitudinal direction (X) of the structure over a length at least equal to half the transverse dimension (L) of the layers of piezoelectric material (12, 14).