Method and device for compensating for coupling nonuniformities in ultrasonic testing
AssigneeProceq SA
InventorsFelix GATTIKER, Thomas SCHLEGEL, Ralph MENNICKE
Life of this patent
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Abstract
A method and a device for testing a component by means of ultrasound is described. It is based on using transducers (4) for sending a probe signal into the component and monitoring its propagation. The response signals (C1 . . . C7) of the individual receivers are analyzed for the strength (A) of the arriving surface wave, and this strength (A) is used for scaling the response signals (C1 . . . C7). This allows to compensate for variations in the coupling strength between the various ultrasonic transducers {4}.
Claims15
A method for testing a component via ultrasound comprising:
- applying a device (1) having at least one ultrasound emitter and a plurality of ultrasound receivers against the component, wherein the ultrasound receivers are located at differing locations in respect to said ultrasound emitter,
- generating a probe signal via said ultrasound emitter,
- receiving, via said ultrasound receivers, a plurality of response signals (Ci), and
- in the response signal (Ci) of at least a group of said ultrasound receivers:
- a) identifying, in said response signal (Ci), a first signal section caused by a surface wave traveling in said component from said ultrasound emitter to the ultrasound receiver having received said response signal (Ci),
- b) deriving a correction value (Vi) from said first signal section, and
- c) rescaling at least a second signal section of said response signal (Ci) with a scale factor depending on said correction value (Vi).
A device for testing a component via ultrasound comprising
- at least one ultrasound emitter for generating a probe signal,
- a plurality of ultrasound receivers for receiving a plurality of response signals (Ci), wherein the ultrasound receivers are located at differing locations in respect to said ultrasound emitter, and
- a control unit adapted and structured, for the response signal (Ci) of at least a group of said ultrasound receivers, to
- a) identify, in said response signal (Ci), a first signal section caused by a surface wave traveling in said component from said ultrasound emitter to the ultrasound receiver having received said response signal (Ci),
- b) derive a correction value (Vi) from said first signal section, and
- c) rescale at least a second signal section of said response signal (Ci) with a scale factor depending on said correction value (Vi).
Dependencies are inferred from the claim text.