Method for ultrasonic imaging and device for performing the method
First Claim
1. A method for non-destructive evaluation of interior structures and flaws in a test specimen, comprising the steps of:
- (a) providing an ultrasonic transducer with a smooth surface;
(b) providing a plurality of flexible ultrasonic wave guides having equal delay times;
(c) arranging said wave guides in parallel between said ultrasonic transducer and a surface of the test specimen;
(d) coupling one end of each of said wave guides ultrasonically to said ultrasonic transducer; and
(e) coupling the other end of each of said wave guides ultrasonically to said surface of the test specimen, the end coupled to said surface of the test specimen being free to engage said surface of the test specimen regardless of test specimen geometry.
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Abstract
A method for ultrasonic imaging of interior structures and flaws in a test specimen with a smooth or irregular contact surfaces, in which an ultrasonic transducer is coupled acoustically to the contact surface via a plurality of ultrasonic wave guides with equal delay times. The wave guides are thin and bendable, so they adapt to variations in the distance between the transducer and different parts of the contact surface by bending more or less. All parts of the irregular contact surface accordingly receive sound waves that are in phase, even when the contact surface is irregular, so a coherent sound wave is infused in the test specimen. The wave guides can be arranged in the form of an ultrasonic brush, with a flat head for coupling to a flat transducer, and free bristles that can be pressed against the test specimen. By bevelling the bristle ends at a suitable angle, shear mode waves can be infused into the test specimen from a longitudinal mode transducer.
61 Citations
12 Claims
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1. A method for non-destructive evaluation of interior structures and flaws in a test specimen, comprising the steps of:
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(a) providing an ultrasonic transducer with a smooth surface; (b) providing a plurality of flexible ultrasonic wave guides having equal delay times; (c) arranging said wave guides in parallel between said ultrasonic transducer and a surface of the test specimen; (d) coupling one end of each of said wave guides ultrasonically to said ultrasonic transducer; and (e) coupling the other end of each of said wave guides ultrasonically to said surface of the test specimen, the end coupled to said surface of the test specimen being free to engage said surface of the test specimen regardless of test specimen geometry. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for coupling an ultrasonic transducer having a predetermined coupling area to a test specimen, comprising:
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(a) a plurality of flexible wave guides having equal delay times for ultrasonic pulses transmitted therethrough; (b) means for arranging said wave guides in parallel between said transducer and said test specimen; (c) means for coupling a first end of each of said wave guides acoustically to said transducer; and (d) means for coupling a second end of each of said wave guides acoustically to said test specimen wherein said second end is free to engage said test specimen regardless of test specimen geometry. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification