US 2026/0210911 A1 · ACOUSTIC INSPECTION DEVICE AND INSPECTION METHOD USING AN INVERSE WAVE FIELD PROPAGATION MODEL

Abstract

A position dependent wave vector amplitude of vibrations on a surface of a structure is determined from acoustic measurements using a sensing device at distance from the surface. The device contains an array of microphones in a fluid medium outside the structure. Vibrations in the structure, which travel through the structure e.g. as Lamb waves. This generates sound outside the structure by leakage of sound waves from the surface of the structure. The microphones obtain measured signals from the sound. Furthermore, a measurement of such as distance is obtained that depends on the measurement position where the array of microphones is provided. The parameter is used in an inverse wave field propagation model for sound propagation in the fluid medium between the surface of the structure and the array of microphones. The inverse wave field propagation model is applied to the measured signals to obtain a position dependent estimation of the sound amplitude and/or phase at the surface. The wave vector amplitude of the vibration as a function of position on the surface is computed from the position dependent estimation.

Claims18

Dependent claims

A method of determining a position dependent wave vector amplitude of vibrations on a surface of a structure, the method comprising:

providing an array of microphones in a fluid medium outside the structure at a measurement position configured to receive sound from the surface of the structure;
generating vibrations in the structure, whereby sound is generated outside the structure by leakage of sound waves from the surface of the structure;
obtaining, using the array of microphones, measured signals from the sound waves from the surface of the structure received at the microphones;
obtaining a measurement of at least one parameter of an inverse wave field propagation model for sound propagation in the fluid medium between the surface of the structure and the array of microphones, wherein the measurement of the at least one parameter depends on the measurement position of the array of microphones;
applying the inverse wave field propagation model to the measured signals from the sound waves from the surface of the structure to obtain a position dependent estimation of sound amplitude and/or phase of the sound waves at the surface of the structure;
and
computing the position dependent wave vector amplitude of vibrations on the surface of the structure as a function of position on the surface of the structure from the position dependent estimation.

4 more elements

An acoustic inspection device comprising:

a carrier;
an array of microphones fixed to the carrier, or at least one microphone fixed to the carrier and configured to synthesize the array of microphones using the at least one microphone;
a transducer configured to generate vibrations in a structure;
and
a processing system configured to carry out a method comprising:
obtaining a measurement of at least one parameter of an inverse wave field propagation model;
obtaining measured signals from sound waves received at the array of microphones or the at least one microphone;
apply the inverse wave field propagation model to the measured signals to obtain a position dependent estimation of sound amplitude and/or phase at a surface of the structure;
and
computing wave vector amplitude of the Lamb wave as a function of position on the surface of the structure from the position dependent estimation.

7 more elements

Dependencies are inferred from the claim text.

Acoustic inspection device and inspection method using an inverse wave field propagation model

Life of this patent

Acoustic inspection device and inspection method using an inverse wave field propagation model

Life of this patent

Abstract

Claims18