Ultrasonic flaw determination by spectral anaylsis
阅读：818发布：2024-02-14
专利汇可以提供Ultrasonic flaw determination by spectral anaylsis专利检索，专利查询，专利分析的服务。并且A method of quantitatively determining the size and orientation of flaws within a material. A broadband pulse having a frequency width of at least several MHz is used for an input pulse from an ultrasonic transducer which is directed toward the immersed test material which may contain a flaw, and the frequency interval between two consecutive frequency maxima of the reflected spectrum due to the difference in distance between each end of the flaw and a receiving transducer is relatable to both the size and orientation of the flaw.，下面是Ultrasonic flaw determination by spectral anaylsis专利的具体信息内容。
1. A nondestructive method for determining the size and orientation of a randomly oriented flaw within a material sample comprising the steps of generating an ultrasonic pulse having a wide frequency spectrum by a transmitter, receiVing with a first receiver positioned in a plane with and at a known spacing distance from said transmitter ultrasonic signals reflected from any flaw in said sample in close proximity to said transmitter, analyzing the frequency spectrum of the reflected signals to determine a first frequency interval between two consecutive frequency maxima of said reflected pulse, recording said first frequency interval generating a second ultrasonic pulse by said transmitter, receiving with a second receiver positioned in said plane with and at a second known spacing distance from said transmitter second ultrasonic signals reflected from said flaw in said sample, analyzing the frequency spectrum of said second reflected signals to determine a second frequency interval between two consecutive frequency maxima of said second reflected pulse, recording said second frequency interval, and finally utilizing the recorded frequency intervals obtained for each respective position of said receivers for determining the size and orientation of the flaw in said sample.
2. The method set forth in claim 1, wherein said first frequency interval is designated Delta f1, and wherein said first frequency interval at said first spacing distance may be expressed by a first equation: Delta f1 v/d (sin ( Alpha 1 + or - theta ) + sin theta ), where v velocity of sound in said sample in which it is propagating when said flaw is encountered; theta orientation of said flaw in said plane; Alpha 1 angle between said transmitter and said first receiver with respect to said flaw; d dimension of said flaw in said plane; and further wherein said second frequency interval is designated Delta f2, said Delta f2 at said second spacing distance may be expressed by a second equation: Delta f2 v/d (sin ( Alpha 2 + or - theta ) + sin theta ), where Alpha 2 is equal to the angle between said transmitter and said second receiver with respect to said flaw, whereby the unknow values of d and theta are determined by solving said equations simultaneously by means of a computer.
3. The method set forth in claim 2, and further including the step of ratating said receivers about said transmitter to a second plane orthogonal to said first plane, and repeating all of said steps of said preceding claim while said receivers are positioned in said second plane for determing the size and orientation of said flaw in said second plane.
4. The method set forth in claim 3, and further including the steps of determining said points of maxima in said reflected spectrum for each position of said receivers by an electronic frequency spectrum analyzer.
5. The method set forth in claim 2, and further including the steps of sequentially rotating said receivers about said transmitter to a plurality of additional planes, and repeating all of said steps of said preceding claim for each additional plane while said receivers are positioned in each respective one of said additional planes for sequentially determining the size and orientation of said flaw in each of said additional planes.
6. The method set forth in claim 5, wherein the number of said additional planes is at least three.
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