ATV underwater ultrasonic tomography section flowmeter
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- ATV underwater ultrasonic tomography section flowmeter
Project Overview
Acoustic tomography technology
Acoustic technology used to play an important role in marine environmental observation, and with the expansion of its applications, it has also become one of the important means in the measurement of other water bodies. Acoustic tomography technology, especially the application of 15-88K frequency acoustic tomography, has also shifted from river mouths and coasts to the measurement of surface water, groundwater and other water bodies.
The Autai Automated ATV Acoustic Tomography Section Flow Meter utilizes underwater acoustic reciprocity transmission (also known as bidirectional acoustic transmission) for acoustic tomography (temperature flow) inversion calculation, and uses Fourier models to reconstruct the sound velocity, temperature field, and flow field in two dimensions.
Sound waves have superior propagation characteristics in water and are an effective radiation form for long-distance transmission of energy and information in surface water. Due to the stratification, peak surface, internal waves, reflection, scattering, absorption, and boundary between water surface and bottom, sound waves carry a large amount of propagation path information during their propagation in water. By analyzing the frequency, phase, time, and multi-path structure of acoustic signals, a lot of water information can be inferred.
Tomography technology is an inversion observation method that can use acoustic radiation to penetrate the measured medium from different angles, and invert the properties of the measured medium by measuring the differences in its absorption and propagation time characteristics. Acoustic tomography is a technique that uses measured changes in propagation time to invert temperature and flow field parameters. The inversion will take into account the parameter changes of temperature, salinity, and depth.
The measurement of cross-sectional flow only requires critical velocity data, so it is not necessary to obtain accurate flow field distribution of each profile, and therefore there is no need to invert through multidimensional monitoring acoustic data. By relying on the time variation of acoustic direct waves and multipath wave reverberation at two points, the two-dimensional cross-sectional average flow velocity can be inverted. By utilizing the high-frequency (1 second cross reciprocity) reciprocity transmission acoustic tomography principle, rapid measurement can be achieved with limited investment, and the system has a small measurement cycle of 5 seconds.
After the ultrasonic signal is emitted from the host, within a 65 degree angle range, the acoustic direct wave and multipath wave reverberation are obtained by the slave, and the complete signal is obtained; After mutual exchange, the slave sound waves are received by the host through the same channel sound waves; The sound signal can basically reflect the velocity field properties of the entire water crossing section, representing the average acoustic characteristics of the water crossing section. The back and forth sound information is inverted through tomography to obtain time variation data, thereby converting the average flow velocity value of the cross-section. (As shown in the following figure:)
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ATV underwater ultrasonic tomography section flowmeter Instrument Model ATV Acoustic Tomography Cross-section Flow Meter Applicable River Channel Width 01 50~200meter 02 201~500meter 03 500 meters or more Process Connection Accessories 0 Customer-provided Special Customized Mounting Bracket 1 Provide Customized Mounting Bracket 2 Provide Standard Mounting Bracket (1.5 meters) 3 Provide Standard Mounting Bracket (2.5 meters) 4 Provide Standard Mounting Bracket (3.5 meters) 5 Provide Standard Mounting Bracket (4.5 meters) Communication Interface 6 4G Communication Output Model Selection Example ATV - 01 - 1 - 6
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