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    Leak-detection device, program, and control method
    11.
    发明授权
    Leak-detection device, program, and control method 有权

    公开(公告)号：US09739684B2

    公开(公告)日：2017-08-22

    申请号：US14430390

    申请日：2013-09-06

    Applicant: NEC Corporation

    Inventor： Shigeki Shinoda ,  Tetsuya Yoshinari ,  Shohei Kinoshita ,  Hiromi Yamamoto ,  Masatake Takahashi ,  Yasuhiro Sasaki

    IPC: G01M3/16 ,  G01M3/24

    CPC classification number: G01M3/16 ,  G01M3/243

    Abstract: A signal acquisition unit (2020) acquires a signal. From the signal acquired by the signal acquisition unit (2020), a detection signal extraction unit (2060) extracts, as a detection signal, a signal of any frequency band among a plurality of partial detection frequency bands into which the frequency band that is the subject of detection has been divided. A determination unit (2070) determines, in order, for each detection signal corresponding to each of the different partial detection frequency bands, whether the detection signal shows any leakage, and if at least a prescribed number of the detection signals are not showing any leakage, determines that leakage is not taking place.

    Vibration detecting apparatus and vibration detecting method
    16.
    发明授权
    Vibration detecting apparatus and vibration detecting method 有权

    公开(公告)号：US09664554B2

    公开(公告)日：2017-05-30

    申请号：US14408574

    申请日：2012-12-11

    Applicant: NEC Corporation

    Inventor： Hideki Kadosawa ,  Tetsuya Yoshinari ,  Shigeki Shinoda ,  Katsumi Abe ,  Yasuhiro Sasaki

    IPC: G01H11/08 ,  G08B13/16 ,  G01H11/06

    CPC classification number: G01H11/06 ,  G01H11/08 ,  G08B13/1654

    Abstract: Provided are a vibration detector and a vibration detecting method, which are power saving, can detect vibration even if the vibration is very weak, and can perform both start-up of the apparatus and collection of data of vibration information by the use of only one sensor. The apparatus includes a vibration detector, a semiconductor switch, a controller and a power supply. The semiconductor switch and the controller are connected to the power supply. The vibration detector detects vibration and consequently generates a vibration voltage. The semiconductor switch includes a voltage divider for generating a bias voltage inside. The semiconductor switch detects a voltage produced by superposing the bias voltage onto the vibration voltage outputted from the vibration detector, and conducts current when the detected voltage is equal to or larger than a certain value. The controller wakes up with the current conducted by the semiconductor switch as a trigger signal.

    LEAK INSPECTION DEVICE, LEAK INSPECTION METHOD, AND LEAK INSPECTION PROGRAM
    17.
    发明申请
    LEAK INSPECTION DEVICE, LEAK INSPECTION METHOD, AND LEAK INSPECTION PROGRAM 有权
    泄漏检查装置，泄漏检查方法和泄漏检查程序

    公开(公告)号：US20150253216A1

    公开(公告)日：2015-09-10

    申请号：US14430258

    申请日：2013-08-19

    Applicant: NEC Corporation

    Inventor： Shigeki Shinoda ,  Yasuhiro Sasaki ,  Masatake Takahashi ,  Junichiro Mataga ,  Soichiro Takata

    IPC: G01M3/28

    CPC classification number: G01M3/2807 ,  F17D5/06 ,  G01M3/243

    Abstract: Each functional configuring unit of a leak inspection device (2000) operates in the manner that follows. A vibration acquisition unit (2020) acquires a signal indicating tubing vibrations or vibrations propagated from tubing. A filtering unit (2040) extracts a signal of a predetermined frequency band from the signal acquired by the vibration acquisition unit (2020). A characteristic value extraction unit (2060) splits the signal extracted by the filtering unit (2040) into predetermined time intervals, calculates for each split signal the absolute value of each extreme value of the magnitude of the signal, performs for each split signal a statistical process with respect to the calculated plurality of absolute values, and considers values calculated by the statistical process to be characteristic values. A leak determination unit (2080) considers inspection results to indicate the presence of a leak when a determination index value stipulated using the characteristic values is greater than a predetermined threshold.

    Abstract translation: 泄漏检查装置（2000）的各功能构成单元按照以下的方式进行动作。 振动获取单元（2020）获取指示管道振动或从管道传播的振动的信号。 滤波单元（2040）从由振动获取单元获取的信号（2020）提取预定频带的信号。 特征值提取单元（2060）将由滤波单元（2040）提取的信号分割成预定的时间间隔，针对每个分割信号计算信号幅度的每个极值的绝对值，对每个分割信号执行统计 对所计算的多个绝对值进行处理，并将通过统计处理计算出的值视为特征值。 当使用特征值规定的确定指标值大于预定阈值时，泄漏确定单元（2080）考虑检查结果以指示泄漏的存在。

    PIEZOELECTRIC VIBRATION SENSOR
    18.
    发明申请
    PIEZOELECTRIC VIBRATION SENSOR 审中-公开
    压电振动传感器

    公开(公告)号：US20150107363A1

    公开(公告)日：2015-04-23

    申请号：US14390185

    申请日：2013-03-18

    Applicant: NEC Corporation

    Inventor： Masatake Takahashi ,  Shigeki Shinoda ,  Soichiro Takata ,  Shigeru Kasai ,  Yasuhiro Sasaki

    IPC: G01H11/08

    CPC classification number: G01H11/08 ,  G01P15/0922 ,  G01P15/097 ,  H01L41/081 ,  H01L41/0933

    Abstract: A piezoelectric vibration sensor includes a piezoelectric element which is in a form of flat plate, an element holding plate which is in a form of flat plate, and first and second support members. An electrode is arranged on at least one plane of the piezoelectric element. The piezoelectric element is joined to one plane of the piezoelectric element. The first support member and the second support member support the piezoelectric element and the element holding plate. A vibration film activates vibration of the element holding plate between the first support member and the second support member. Moreover, the element holding plate is joined to each of the first support member and the second support member through the vibration film. As a result, it is possible to obtain high sensitivity in a wide frequency range and to withstand an impact which is added from the outside.

    Abstract translation: 压电振动传感器包括平板形式的压电元件，平板形式的元件保持板以及第一和第二支撑构件。 电极布置在压电元件的至少一个平面上。 压电元件接合到压电元件的一个平面。 第一支撑构件和第二支撑构件支撑压电元件和元件保持板。 振动膜激活元件保持板在第一支撑构件和第二支撑构件之间的振动。 此外，元件保持板通过振动膜连接到第一支撑构件和第二支撑构件中的每一个。 结果，可以在宽的频率范围内获得高灵敏度并且能够承受从外部添加的冲击。

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