METHOD AND APPARATUS FOR DETERMINING THE SET OF FOCAL LAWS OF A PLURALITY OF FOCAL POINTS LOCATED IN A THREE-DIMENSIONAL TEST OBJECT IN THE PRESENCE OF A COUPLING MEDIUM
The invention provides a method for determining the set of focal laws of a plurality of focal points located in a test object (1). The method comprises the steps of providing a bidimensional array of transducer elements (2) in a coupling medium and defining at least a scan line (4) by a set of focal...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | The invention provides a method for determining the set of focal laws of a plurality of focal points located in a test object (1). The method comprises the steps of providing a bidimensional array of transducer elements (2) in a coupling medium and defining at least a scan line (4) by a set of focal points (5). For each scan line (4), the method comprises performing the sub-steps of choosing a two preliminary focal points (F1, F2), calculating a first auxiliary time-of-flight corresponding to the time-of-flight of a wave emitted from the corresponding transducer element (2) and received in the first preliminary focal point (F1), and a second auxiliary time-of-flight corresponding to the time-of-flight of a wave emitted from the same transducer and received in the second preliminary focal point (F2). Then, determining a constant time value (tK) and an intermediate variable (y) and finally calculating, for the rest of the set of focal points of the scan line (4), the focal laws to each transducer (2) by using the constant time value (tK) and the intermediate variable (y). |
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