AWAC phonetics
AWAC This is a very innovative instrument that can measure the velocity profile and measure the wave at this one. EMEP Using the software for the direction spectrum calculation by the method (extended Zui large entropy method), detailed wave direction spectral data can be obtained. In addition to the memory record by the external battery, this measuring instrument corresponds to the real-time recording by the wire cable.
This instrument is a model that applies the basic principle of the port no.2948472 (name "sea gauge") of the port and Airport Research Institute, the Marine Research Association of Japan, the Sea Research Association of Japan, and it is sold in Japan as a practice of the patent invention by sonic.
Velocity output item |
Three component velocity and three beam reflection intensity for each set layer |
Wave output item |
Significant wave height, 1 / 10 Zui large wave height, Zui wave height, average wave height |
Name |
Ultrasonic wave height?Wave direction?Profiler |
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Type |
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Flow direction measurement specification |
Ultrasonic frequency |
1 MHz |
600 kHz |
400 kHz |
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Distance measurement |
30m |
50 m |
100 m |
|
Layer thickness |
0.254.0 m |
0.58.0 M |
1.08.0 M |
|
Proximity dead distance |
0.2 M~ |
0.3 M~ |
1.0 m~ |
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Measuring layer |
1128 layers |
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Velocity range |
0± 10 m / S |
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Accuracy of velocity measurement |
The measurement value is |
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Wave height measurement specification |
Measuring method |
Vertical beam, water pressure, velocity |
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Range of measurement |
35 m |
60m |
100 m |
|
Interval |
1 Hz / 2 Hz(4HzAST) |
1 Hz(2HzAST) |
0.75 Hz(1.5HzAST) |
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Number of measurements |
5121024, 1200, 248, 2400 |
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Calculation method |
Extended Zui large entropy (EMEP) method |
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Calculation output |
High wave wave period |
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Hardware specification |
Record capacity |
9 MB(standard), + 32 / + 176 / + 352 MB extensible or 4 gBSD |
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Dimensions |
Diameter: 190 mm to 210 mm, height |
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Weight |
6.1 kg |
6.2kg |
7.3 kg |
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Underwater weight |
2.9 kg |
2.9 kg |
3.6 kg |
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Breakdown performance |
300 meters(depending on the mounting depth sensor) |
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Battery |
Battery canister (alkaline / lithium) |
Mounting sensor specification (common)
Sensor |
Water temperature |
Compass |
Slope |
Depth type |
Method |
Thermistor |
Magnetic resistance (MR) equation |
Electrolyte type |
Piezo resistance |
Range |
-440 degrees centigrade |
0360 degrees |
0~±30° |
Selectable |
Accuracy |
± 0.1 |
± |
± 0.2 degrees |
± 0.5% FS |
Resolution |
0.01 degrees centigrade |
0.1 degrees |
0.1 degrees |
0.005% FS |
Dimensional drawing
は3Measure two different wave data and calculate the wave height and wave period from there. Data to measure pressure?Wave velocity?Water surface position. The pressure is high resolution piezoresistive element, and the wave velocity is measured by the Doppler effect along the beam. The water level is a special mode of ultrasonic water surface tracking which detects the position of the water surface with a short outgoing pulse from a transducer located at the center of the measuring instrumentAST. Measurement of velocity profile onlyASTCan be used even without.
ASTThere are automatic mode and fixed mode to set the sensing range, the thickness and position of the velocity. In the case of automatic mode, it is set from the pressure data in the velocity profiler measurement before the wave height observation. This information is included in the recorded data.
If the water level changesASTBy extending the range of sensing and lowering the measurement position of velocity, stable data is acquired. When the water level change is small, the measurement position of the flow velocity is raised, and the sensitivity of the wave direction measurement is raised.
ThusHas succeeded in acquiring very accurate wave data. AndASTYou can also measure the thickness of sea ice.
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