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    • 2. 发明授权
    • Micro fracture detector
    • 微裂缝检测器
    • US4501149A
    • 1985-02-26
    • US543707
    • 1983-10-20
    • Junichi KonnoYukihiro UedaHiroaki NiitsumaNoriyoshi Chubachi
    • Junichi KonnoYukihiro UedaHiroaki NiitsumaNoriyoshi Chubachi
    • G01N29/14G01R23/16G06F17/14G01N29/04G06F15/332
    • G01N29/14G01N2291/0258
    • An acoustic emission is detected by a pickup, and its output is converted by a A/D converter into a digital signal, which is provided to a fast Fourier transform processor. The fast Fourier transform processor comprises a cascade connection of a plurality of operation stages, each composed of first and second input memories, a third memory having stored therein a rotation vector and an arithmetic unit for performing a Butterfly operation through using the pipelined architecture. In each stage one of the first and second input memories and the third memory are read out and the Butterfly operation is carried out on the pipelined basis. The operation result is written into that one of the first and second input memories of the next operation stage which has not been read out; thus all the operation stages perform a pipelined operation as a whole. The power of a spectrum obtained as the operation result of the last operation stage is calculated, obtaining a signal corresponding to the acoustic emission.
    • 声发射由拾取器检测,并且其输出由A / D转换器转换成数字信号,数字信号被提供给快速傅里叶变换处理器。 快速傅里叶变换处理器包括由第一和第二输入存储器组成的多个操作级的级联连接,其中存储有旋转矢量的第三存储器和用于通过使用流水线架构执行蝴蝶操作的运算单元。 在每个阶段,读出第一和第二输入存储器和第三存储器中的一个,并且在流水线的基础上执行蝴蝶操作。 操作结果被写入未读出的下一个操作级的第一和第二输入存储器中的一个; 因此所有的操作阶段整体上进行流水线操作。 计算作为最后一个操作阶段的操作结果获得的频谱的功率,获得对应于声发射的信号。