Delamination detector
阅读：922发布：2024-02-26
专利汇可以提供Delamination detector专利检索，专利查询，专利分析的服务。并且To detect the presence of certain types of hidden flaws within a material having an exposed surface, the surface is tapped at one location to produce sonic vibrations within the material. At another location, an acoustic receiving transducer is coupled to the surface of the material being tested. A characteristic of the electrical signals produced by the transducer which is indicative of the type of flaw to be detected is utilized to denote the presence of a flaw. A mobile form of apparatus which detects flaws while traversing the surface of the material and which indicates the location as well as the existence of the flaws is described.，下面是Delamination detector专利的具体信息内容。
1. In an apparatus for detecting subsurface delaminations and flaws in a material, the improvement comprising: force applying means delivering to the surface of the material sharp, short duration, repetitive, force impulses having sufficient energy to excite therein vibrations between 300 and 1,200 Hz which are characteristic of the separation of the material into two or more unbonded layers; vibration receiving transducer means acoustically coupled to the surface of the material for receiving said vibrations and producing therefrom electrical signals characteristically related to said vibrations, said coupling being at a location spaced from the location at which the force applying means acts upon the material, said spacing being comparable with the dimension of the minimum area of a delamination or flaw which it is desired to detect; and indicating devices responsive to a characteristic of said electrical signals.
2. The apparatus set forth in claim 1 including an electrical circuit for time-gating, frequency-filtering, rectifying and integrating the electrical signals.
3. The apparatus set forth in claim 1 mounted in a mobile vehicle.
4. The apparatus set forth in claim 3 including acoustic isolating means interposed between the force applying means and the receiving transducer means whereby vibrations produced by the force applying means are prevented from reaching the transducer means except by travelling through the material.
5. The apparatus Set forth in claim 3 wherein the indicating devices include a chart recorder having a drive which is connected to the mobile vehicle to indicate the travel thereof.
6. In a mobile vehicle for detecting subsurface delaminations and flaws in a material, the improvement comprising: force applying means acting upon the surface of the material through a rigid wheel, said means delivering sharp, short-duration, repetitive, force impulses having sufficient energy to excite within the material vibrations between 300 to 1,200 Hz which are characteristic of the separation of the material into two or more unbonded layers; vibration receiving transducer means acoustically coupled to the surface of the material for receiving said vibrations and producing therefrom electrical signals characteristically related to said vibrations, said transducer means being acoustically coupled to the material through a liquid-filled wheel at a location spaced from the location at which the force applying means acts upon the material, said spacing being comparable with the dimension of the minimum area of a delamination or flaw which it is desired to detect; indicating devices responsive to a characteristic of said signals; signal processing means containing electrical circuits for time-gating whereby only those portions of the electrical signals which occur during the first three millisecond time interval following the application of the force to the material are permitted to affect the indicating devices; electrical circuits for frequency-filtering whereby only those portions of the electrical signals which fall within the band 300 to 1,200 Hz are permitted to affect said indicating devices; and electrical rectifying and integrating circuits which develop a uni-polar sustained output signal related to those portions of the electrical signals which are permitted to affect said indicating devices.
7. The apparatus set forth in claim 6 including at least two separate acoustic isolating devices at least one of which is interposed between the force applying means and the vehicle and at least one other of which is interposed between the vehicle and the receiving transducer means, whereby vibrations produced by the force applying means are prevented from reaching the transducer means except by travelling through the material.
8. The apparatus set forth in claim 6 wherein the indicating devices include a chart recorder having a drive which is connected to the mobile vehicle to indicate the travel thereof.
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