Tokimec Inc.

Yutaka Kashiwase

Shinichi Takeuchi

Ryohei Motegi

Kinuko Kato

Ryo Ishiyama

An apparatus for detecting flaws using supersonic waves measures a thickness of a test object or a position of a cavity inside the test object by employing a pair of ultrasonic probes. By, changing a relative position of one ultrasonic probe to that of the other ultrasonic probe, a plurality of waveform data of ultrasonic reception signals is acquired. Each of the acquired waveform data is added together. Because a surface wave component of each waveform data has a shifted phase due to a difference in arrival times, a level of the surface wave component is offset and thus minimized through addition of the waveform data.

Flaw detection apparatus employing tire probes having ultrasonic

An apparatus for detecting flaws using supersonic waves measures a thickness of a test object or a position of a cavity inside the test object by employing pair of ultrasonic probes. By changing a relative position of one ultrasonic probe to that of the other ultrasonic probe, a plurality of waveform data of ultrasonic reception signals is acquired. Each acquired waveform data is added per corresponding unit of time. Since a surface wave component of each waveform data has a shifted phase due to the difference in arrival time, a level of the surface wave component is offset and thus minimized through addition of the waveform data.

Flow detection apparatus employing tire probes having ultrasonic

An ultrasonic transducer is provided with an ultrasonic transmitter; an ultrasonic receiver; and a propagation-delay-time calculating device for calculating a propagation delay time from the time when an ultrasonic wave is transmitted by the transmitter until the time when the ultrasonic wave is received by the receiver. The propagation-delay-time calculating device includes: a waveform storage section in which a waveform signal of the ultrasonic wave received by the ultrasonic receiver is converted to a digital value after sampling at a predetermined timing and is stored sequentially; a virtual-zero-crossing-position detecting unit for detecting a virtual zero-crossing point on the basis of the waveform signal stored; a regression-line calculating unit or a regression curve calculating unit for estimating a zero-crossing point of the received wave by fetching from the waveform storage section waveform data at a plurality of addresses centering on an address shown by an output of the virtual-zero-crossing-position detecting unit, and by effecting a regression-line interpolation or a regression-curve interpolation with respect to the waveform data; and a propagation-delay-time calculating section for calculating the propagation delay time of the ultrasonic wave received on the basis of the zero-crossing point estimated.

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Tokyo, Japan

Yutaka Kashiwase