公开(公告)号：US5040419A

公开(公告)日：1991-08-20

申请号：US467654

申请日：1990-01-19

Applicant: Claude Allaire ,  Lionel Talbot, deceased

Inventor： Claude Allaire ,  Lionel Talbot, deceased

IPC: G01N29/07 ,  G01N29/30

CPC classification number: G01N29/07 ,  G01N29/30

Abstract: The non-destructive testing of materials, particularly coarse grain materials such as the carbonaceous materials used in the anodes and cathodes of an aluminium smelting furnace, using longitudinal compression waves employs a waveguide to apply the waves to a specimen, the and specimen having a cross-sectional dimension Dg of between 3 and 5 times the material average grain size Dg. Alternatively, or in addition, the waves used preferably are of effective wavelength from about 30Ds to 50Ds. Alternatively, or in addition, the effective wavelength of the waves is preferred to be approximately equal to the length of the sample; the necessary very long samples may be obtained by connecting a plurality of smaller elementary samples end-to-end. The apparatus may include a controllable furnace for cycling the sample to determine the change with temperature of the physical characteristic that is being measured. The methods and apparatus employ relatively low frequencies, in the sonic range, and high powers; although particularly suited for measurements with coarse grain materials they are also very effective with more usual fine grain materials, such as ceramics.

Abstract translation: 使用纵向压缩波，材料，特别是粗粒材料，例如铝熔炼炉的阳极和阴极中使用的碳质材料的无损检测使用波导将波施加到试样上，并且试样具有交叉 尺寸Dg为材料平均粒径Dg的3〜5倍。 或者或另外，优选使用的波具有约30D至50D的有效波长。 或者或另外，波的有效波长优选近似等于样品的长度; 可以通过端到端连接多个较小的基本样本来获得必要的非常长的样本。 该装置可以包括用于循环样品以确定正被测量的物理特性随温度变化的可控炉。 方法和装置在声波范围和高功率下采用相对较低的频率; 虽然特别适用于粗粒材料的测量，但它们对于更常见的细晶粒材料如陶瓷也是非常有效的。