System and method for acoustically detecting cross bores

    公开(公告)号:US11747496B2

    公开(公告)日:2023-09-05

    申请号:US16441529

    申请日:2019-06-14

    Abstract: An assembly and method for detecting cross bores involving a sewer system and a gas pipe includes an acoustic generator placed within an interior of the sewer system and an acoustic receiver placed either within an interior of the gas pipe or in proximity to an end of the gas pipe. The acoustic generator generates an acoustic signal to transmit through the interior of a sewer pipe of the sewer system. A controller detects, in response to the acoustic receiver hearing the acoustic signal, a cross bore involving the sewer pipe and the gas pipe. A microphone may be placed within the interior of the sewer system at a location remote from the acoustic generator. In this case, the controller determines, in response to the acoustic receiver not hearing the acoustic signal and the microphone hearing the acoustic signal, that a cross bore involving the sewer pipe and the gas pipe is absent.

    Electro-magnetic acoustic transducer (EMAT) having electromagnet array for generating configurable bias magnetic field patterns

    公开(公告)号:US11561205B2

    公开(公告)日:2023-01-24

    申请号:US16863455

    申请日:2020-04-30

    Inventor: Baiyang Ren

    Abstract: An electro-magnetic acoustic transducer (EMAT) having an electromagnet array is provided. The electromagnet array includes electromagnets. Each electromagnet includes a magnetic core and a wound coil wrapped around the magnetic core. The electromagnet array generates bias magnetic fields having different patterns when the wound coils are energized differently. For instance, the electromagnet array generates a bias magnetic field having a given pattern, for the EMAT to transmit a first type of ultrasonic wave such as shear-horizontal wave, when the wound coils are energized in a given manner; and generates a bias magnetic field having a different pattern, for the EMAT to transmit a second type of ultrasonic wave such as a Lamb wave, when the wound coils are energized in a different manner.

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