Japan Probe Co.

Yokohama-shi, Japan

Japan Probe Co.

Yokohama-shi, Japan
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Ozawa A.,Ehime University | Izumi H.,Ehime University | Nakahata K.,Ehime University | Ohira K.,Japan Probe Co. | Ogawa K.,Toshiba Corporation
AIP Conference Proceedings | Year: 2017

The use of ultrasonic arrays to conduct nondestructive evaluation has significantly increased in recent years. A post-processing beam-forming technique that utilizes a complete set of signals of all combinations of transmission and reception el-ements was proposed as an array imaging technique. In this study, a delay-and-sum beam reconstruction method utilizing post-processing was applied to the imaging of internal voids and reinforced steel bars in concrete material. Due to the high attenuation of the ultrasonic wave in concrete, it is necessary to use an ultrasonic wave as the incident wave at low frequencies and high in-tensities. In this study, an array transducer with a total of 16 elements was designed on the basis of a multigaussian beam model. The center frequency of the transducer was 50 kHz, and low frequency imaging was achieved by performing computations using a graphics processing unit accelerators in the post-processing beam formation. The results indicated that the shapes of through holes and steel bars in a concrete specimen with 700 mm height were reconstructed with high resolution. © 2017 Author(s).

Chang J.,Nanchang Hangkong University | Chang J.,Japan Probe Company Ltd | Lu C.,Nanchang Hangkong University | Kawashima K.,Ultrasonic Material Diagnosis Laboratory
FENDT 2013 - Proceedings of 2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application | Year: 2013

We have developed the V transmission system using for online scanning, insitu-defects testing and automatic detection by Non-contact Air Coupled Ultrasonic Testing (NAUT), NAUT with the ultra-high power square burst wave pulser & receiver. Square burst waves transmit and receive more powerful ultrasonic than pulse wave. It is easy to obtain the optimum detective condition by changing of frequency & numbers of waves. Therefore it is suitable for NAUT to require the powerful transmission and receiving. This paper mainly discusses the non-contact air-coupled ultrasonic testing method (abbr. V transmission method), which is based on the transmission mode but receives the reflected signals from the same side. Firstly, the basic principle of the air-coupled ultrasonic testing and the V transmission method was described. Then, it was focused on the velocity measurement by using the non-contact air-coupled ultrasonic method and detection of internal defects. The measured results for some application examples were shown, such as detection and imaging of the defects in the acrylic block with/without hole, which is very difficult by using traditional methods. Last, the propagation velocity in concrete and the imaging in reinforced concrete were measured. © 2013 IEEE.

Tanaka Y.,Japan Probe Co. | Ohira K.,Japan Probe Co. | Ogura Y.,Japan Probe Co. | Tanaka K.,Ritsumeikan University | And 3 more authors.
Japanese Journal of Applied Physics | Year: 2014

In this paper, we describe the trial manufacture of ultrasonic linear array probes for medical puncture while observing the needle tip and the front lesion by imaging. Two kinds of linear array probes having 13 elements and 128 elements were fabricated. The signal intensity received from the needle tip was simulated and experimentally confirmed as a function of the insertion depth of the needle. The puncture of a simulated blood vessel phantom and a blood vessel of a pig were observed by B-mode imaging. We experimented on the puncture of a dog with the 128-channel linear array probe, and the femoral artery and vein were imaged. The needle tip position was successfully detected during the puncture of the femoral muscle of the dog, and the human median cubital vein was also imaged. © 2014 The Japan Society of Applied Physics.

Tanaka Y.,Ritsumeikan University | Tanaka K.,Ritsumeikan University | Sugiyama S.,Ritsumeikan University | Kurumi Y.,Shiga University of Medical Science | And 3 more authors.
Japanese Journal of Applied Physics | Year: 2011

A small ultrasonic probe capable of precise control of needle position is required for biopsies taken in abdominal surgery and laparoscopic surgery. We fabricated a small size ring-shaped probe with a through hole to insert the needle. The probe simultaneously detects the object in front of it, e.g., a lesion, and the tip of the needle. The error of the insertion depth measured by this detection was estimated to be less than 10.1% at a depth of more than 5mm when the inner diameter of the probe was 1.1mm and the outer diameter of the needle was 0.6 mm. The results of an experiment using a stomach wall specimen indicate that the position of the needle can be precisely controlled because the needle is directly below the probe. © 2011 The Japan Society of Applied Physics.

Fang Y.,Nanjing Agricultural University | Fang Y.,Zhejiang University | Lu Z.,Nanjing Agricultural University | Lin L.,Zhejiang University | And 2 more authors.
BioResources | Year: 2016

Air-coupled ultrasound has shown excellent sensitivity and specificity for the nondestructive imaging of wood-based material. However, it is time-consuming, due to the high scanning density limited by the Nyquist law. This study investigated the feasibility of applying compressed sensing techniques to air-coupled ultrasound imaging, aiming to reduce the number of scanning lines and then accelerate the imaging. Firstly, an undersampled scanning strategy specified by a random binary matrix was proposed to address the limitation of the compressed sensing framework. The undersampled scanning can be easily implemented, while only minor modification was required for the existing imaging system. Then, discrete cosine transform was selected experimentally as the representation basis. Finally, orthogonal matching pursuit algorithm was utilized to reconstruct the wood images. Experiments on three real air-coupled ultrasound images indicated the potential of the present method to accelerate air-coupled ultrasound imaging of wood. The same quality of ACU images can be obtained with scanning time cut in half.

Thornton B.,University of Tokyo | Asada A.,University of Tokyo | Ura T.,University of Tokyo | Ohira K.,Japan Probe Co. | Kirimura D.,Link Laboratory. Inc.
OCEANS'10 IEEE Sydney, OCEANSSYD 2010 | Year: 2010

This paper describes the development of an acoustic probe designed to perform in-situ measurements of ferro-manganese crust thickness at depths of up to 3000m. It is planned that this device will operate at low altitudes off the seafloor, mounted onboard an underwater vehicle, and continuously map the crust thickness of regions extending over several kilometres. A prototype probe has been developed together with an algorithm that automatically detects the reflections from the top and bottom surfaces of a layer of crust and measures its thickness. The performance of the system is demonstrated through a series of laboratory experiments carried out using crust samples obtained during the NT09-02 Leg2 of the R/V Natsushima. First, the ability of the system to measure crust thickness at various ranges to the target is assessed. Next, the effects of pressure are investigated in an experiment where the thicknesses of several crust samples are measured at pressures between 0.1 and 30MPa. Finally, the sub-bottom profiles of a number of crust samples, with and without substrates attached are measured. © 2010 IEEE.

Nishino H.,Tokushima University | Asano T.,Tokushima University | Taniguchi Y.,Tokushima University | Yoshida K.,Tokushima University | And 3 more authors.
Japanese Journal of Applied Physics | Year: 2011

In this paper, we present a novel method of accurately estimating pipe wall thickness by detecting the minute difference in the angular wave number of a circumferential (C-) Lamb wave. A C-Lamb wave circling along a circumference of a pipe is transmitted and received by a pair of noncontact air-coupled ultrasonic transducers. For the accurate detection of the angular wave number, a large number of tone-burst cycles are used so as to superpose the C-Lamb wave on itself along its circumferential orbit. In this setting, the amplitude of the superposed region changes considerably with the angular wave number, from which the wall thickness can be estimated. This method is very useful to monitor the integrity of piping in high-temperature environments because of its noncontact nature. The principle of the method and experimental verification are shown. © 2011 The Japan Society of Applied Physics.

Takahashi M.,Japan Probe Co. | Hoshino H.,Japan Probe Co. | Ogura Y.,Japan Probe Co. | Kitagawa H.,Japan Probe Co. | And 3 more authors.
Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | Year: 2011

We have developed the constant incident angle method to inspect pipes by using high power square burst wave in non contact air coupled ultrasonic testing (NAUT). We also succeeded to scan the effective guided wave propagated circumferentially in pipes. This paper describes the optimum frequency, incident angle, the selection of probes and examples of detecting image pictures with the constant incident angle focusing method using focus probe. © 2011 The Japan Society of Mechanical Engineers.

Nakahata K.,Ehime University | Tokumasu S.,Ehime University | Sakai A.,Japan Probe Co. | Iwata Y.,Japan Probe Co. | And 2 more authors.
NDT and E International | Year: 2016

In this study, we used a flexible array transducer to obtain images of flaws in materials with irregular surfaces. The transducer was manufactured from a 1-3 composite made of piezoelectric zirconate titanate and epoxy resin, and covered with neoprene rubber layers. An approach that involved combining a flexible array transducer and full matrix capture (FMC) is effective, because the surface geometry and flaw signal data can be separately measured and merged during post-processing. The disadvantage of the flexible array transducer is its narrow frequency band due to the thin damping material. To enhance the spatial resolution, we used the scattering amplitude extracted from raw signal data. We also introduced a numerical apodization technique to suppress the influence of side lobe. We validated the performance of the proposed method by measuring the signals from artificial flaws in aluminum specimens, performing high-speed FMC imaging using graphic processing unit computation. © 2016 Elsevier Ltd. All rights reserved.

Nakahata K.,Ehime University | Chang J.,Japan Probe Co. | Takahashi M.,Japan Probe Co. | Ohira K.,Japan Probe Co. | Ogura Y.,Japan Probe Co.
Acoustical Science and Technology | Year: 2014

To better understand wave propagation and scattering phenomena in noncontact ultrasonic testing (UT), we have developed a time domain simulation tool to model wave propagation in air and solids. The tool is based on the finite integration technique (FIT) and an image-based modeling approach. The image-based FIT can treat the calculation of acoustic, elastic, and coupled waves in a unified grid form. In this paper, we first investigate the accuracy of the interface condition in FIT modeling by comparing numerical results with analytical solutions of transmission and reflection coefficients. Then we validate the FIT using measured signals in guided wave testing with air-coupled transducers. To simulate noncontact UT, a fine mesh is required in the FIT because the wavelength in air is much smaller than that in a solid. To solve the numerical problem with the finer mesh at high speed, we introduce a parallel computation technique with general-purpose computing on graphics processing units (GPUs). It is shown that the noncontact UT simulation can be executed within a reasonable time and with reasonable accuracy using multiple GPUs. © 2014 The Acoustical Society of Japan.

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