Sonic Corporation

Tachikawa, Japan

Sonic Corporation

Tachikawa, Japan
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Kono H.,University of Hyogo | Watanabe S.,University of Hyogo | Iwai Y.,Sonic Corporation | Ito Y.,Sonic Corporation | And 3 more authors.
International Journal of Environment and Pollution | Year: 2011

We observed the turbulence and vertical profile of temperature in and above the roughness sublayer (RS) using a tower, a tethered balloon and a Doppler sodar in Himeji City. A 3-D ultrasonic anemometer-thermometer was sited at a height of 54 m on the tower. The present results showed that in the RS, the ratio of friction velocity to wind speed, u*/u, observed under unstable conditions of - 4.2 < z′/L < -0.5 were close to those under neutral conditions, where z′ = z - d; the displacement height d = 2 m; L is the Monin-Obkhov stability length. In addition, σ w/u* were lower than the universal function presented by Panofsky et al. (1977). The cross correlation coefficients for u′w′ and T′w′ under neutral and unstable conditions were also studied. Copyright © 2011 Inderscience Enterprises Ltd.


Tamaki M.,Japan National Institute of Rural Engineering of Japan | Tamaki S.,University of Ryukyus | Ito Y.,Sonic Co. | Touma T.,Takunan Shinsen Co. | And 2 more authors.
Journal of Wind Engineering | Year: 2010

Performance of the uneven dual-screen windbreak (UDSW) to protect agricultural products from the strong wind was tested when the typhoon 0310 attacked Okinawa. The test area surrounded by the UDSW is located on a plateau near a cliff. Wind speed was measured by ultrasonic anemometers at 6m high from the ground outside of the test area and 3m and 6m high inside. The relations between the distance from the cliff edge and the average wind speed were indicated a quadratic function of the distance in the range of 400m from the edge. These calculated data by a quadratic function were compared with the measured data. The wind speed at 28m leeward from the UDSW was reduced by 25% at a height of 6m, and that at 90m leeward was reduced by 17%. The wind speed ratio at a height of 3m to 6m was increased with distance from the UDSW about 0.83 to 0.92.


Horiguchi M.,Kyoto University | Hayashi T.,Kyoto University | Hashiguchi H.,Kyoto University | Ito Y.,Sonic Corporation | Ueda H.,Japan Environmental Sanitation Center
Boundary-Layer Meteorology | Year: 2010

Turbulence structures of high Reynolds number flow in the near-neutral atmospheric boundary layer (ABL) are investigated based on observations at Shionomisaki and Shigaraki, Japan. A Doppler sodar measured the vertical profiles of winds in the ABL. Using the integral wavelet transform for the time series of surface wind data, the pattern of a descending high-speed structure with large vertical extent (from the surface to more than 200-m level) is depicted from the Doppler sodar data. Essentially this structure is a specific type of coherent structure that has been previously shown in experiments on turbulent boundary-layer flows. Large-scale high-speed structures in the ABL are extracted using a long time scale (240 s) for the wavelet transform. The non-dimensional interval of time between structures is evaluated as 3.0-6.2 in most cases. These structures make a large contribution to downward momentum transfer in the surface layer. Quadrant analyses of the turbulent motion measured by the sonic anemometer (20-m height) suggest that the sweep motion (high-speed downward motion) plays a substantial role in the downward momentum transfer. In general, the contribution of sweep motions to the momentum flux is nearly equal to that of ejection motions (low-speed upward motions). This contribution of sweep motions is related to the large-scale high-speed structures. © 2010 Springer Science+Business Media B.V.


Mitsui M.,Sonic Corporation | Hashimoto N.,Kyushu University | Kawai H.,Port and Airport Research Institute | Yokota M.,Kyushu University | Kitamura Y.,Sonic Corporation
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2011

An upgraded submerged Doppler-type directional wave meter can measure 10 wave quantities related to directional wave motions, i.e. water surface elevation, 3 components of water particle velocities at each layer of 3 different water depth ranging from shallow to deep. In this study, accuracy of directional spectrum estimation is comprehensively investigated for various cases where directional spectra are estimated with various sets of different number of wave quantities. As a result, accuracy improvement is generally confirmed in various wave conditions when all the quantities are applied to the estimations, compared with the cases where conventional 4 wave quantities are applied to the estimations. Moreover, the advantage of BDM with the improved computation method was confirmed. Copyright © 2011 by the International Society of Offshore and Polar Engineers (ISOPE).


Patent
Woojin Inc. and Sonic Corporation | Date: 2016-03-02

The present invention relates to flow measurement, and more particularly, to a system for measuring a flow rate by three-dimensionally crossing a plurality of sidings each other within a conduit. An ultrasonic flow measurement system according to the present invention determines a flow central part of fluid by three-dimensionally crossing the plurality of sidings each other within the conduit in three dimensions and calculates a flow rate flowing in the conduit, meeting the flow central part, thereby more accurately measuring the flow rate than the existing method.


Patent
Woojin Inc. and Sonic Corporation | Date: 2016-02-10

Provided is an ultrasonic sensor which includes a piezoelectric vibrator made of a lithium niobate (LN) single crystal and may be used in a high temperature region by generating a high ultrasonic wave output, and prevents cracks from being generated in the crystal. A piezoelectric vibrator 1 of the present invention has a surface (Y-axis 36 cut surface) obtained by rotating a surface orthogonal to a Y-axis of the LN crystal about an X-axis by 36 2 as an output surface. The ultrasonic sensor further includes a retarder 3 made of titanium and a bonding layer 2 for bonding one surface of the retarder 3 to the output surface. The bonding layer 2 is made of silver and frit glass, and the frit glass has a coefficient of linear expansion ranging from 5 10^(-6) K^(-1) to 15 10^(-6) K^(-1).


Patent
Woojin Inc. and Sonic Corporation | Date: 2014-04-14

The present invention relates to flow measurement, and more particularly, to a system for measuring a flow rate by three-dimensionally crossing a plurality of sidings each other within a conduit. An ultrasonic flow measurement system according to the present invention determines a flow central part of fluid by three-dimensionally crossing the plurality of sidings each other within the conduit in three dimensions and calculates a flow rate flowing in the conduit, meeting the flow central part, thereby more accurately measuring the flow rate than the existing method.


Patent
Woojin Inc. and Sonic Corporation | Date: 2014-03-25

Provided is an ultrasonic sensor which includes a piezoelectric vibrator made of a lithium niobate (LN) single crystal and may be used in a high temperature region by generating a high ultrasonic wave output, and prevents cracks from being generated in the crystal. A piezoelectric vibrator 1 of the present invention has a surface (Y-axis 36 cut surface) obtained by rotating a surface orthogonal to a Y-axis of the LN crystal about an X-axis by 362 as an output surface. The ultrasonic sensor further includes a retarder 3 made of titanium and a bonding layer 2 for bonding one surface of the retarder 3 to the output surface. The bonding layer 2 is made of silver and frit glass, and the frit glass has a coefficient of linear expansion ranging from 510^(6 )K^(1 )to 1510^(6 )K^(1. )


Trademark
Sonic Co. | Date: 2013-10-02

clothing for children or babies, namely, dresses, suits, jackets, shirts, T-shirts, blouses, sweaters, vests, pants, slacks, jeans, overalls, sweat pants, shorts, bottoms, skirts, hats, caps, bandanas, scarves, neckties, mufflers, pullovers, socks, stockings, gloves; belts for clothing; footwear.


Trademark
Sonic Co. | Date: 2013-10-02

clothing for children or babies, namely, dresses, suits, jackets, shirts, T-shirts, blouses, sweaters, vests, pants, slacks, jeans, overalls, sweat pants, shorts, bottoms, skirts, hats, caps, bandanas, scarves, neckties, mufflers, pullovers, socks, stockings, gloves; belts for clothing; footwear.

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