RU2710527C1 - Acoustic doppler current meter - Google Patents

Acoustic doppler current meter Download PDF

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Publication number
RU2710527C1
RU2710527C1 RU2019116478A RU2019116478A RU2710527C1 RU 2710527 C1 RU2710527 C1 RU 2710527C1 RU 2019116478 A RU2019116478 A RU 2019116478A RU 2019116478 A RU2019116478 A RU 2019116478A RU 2710527 C1 RU2710527 C1 RU 2710527C1
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Russia
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processor
device
computing device
external computing
current meter
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RU2019116478A
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Russian (ru)
Inventor
Дмитрий Олегович Городецкий
Константин Андреевич Костылев
Евгений Валерьевич Кротов
Александр Алексеевич Родионов
Алексей Михайлович Соков
Алексей Вячеславович Циберев
Александр Сергеевич Чащин
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Общество с ограниченной ответственностью НТЦ "Мониторинг"
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems

Abstract

FIELD: oceanology; hydrology; measuring equipment.
SUBSTANCE: invention relates to the field of oceanology and hydrology and concerns a device for measurement of flow velocity using reflection of acoustic waves. Acoustic Doppler current meter comprises four transceiving channels, a processor and built-in memory, structurally enclosed in one housing, as well as power supply unit, data processing unit, RS 485 communication channel, wherein each of the transceiving channels comprises a serially connected transceiving head, a transceiving module, an amplifier, an analogue-to-digital converter. Device also has a programmable logic integrated circuit connecting said transceiving channels with the processor. Data processing unit is implemented on external computing device, processor is connected to external computing device by high-speed communication channel. External computing device is equipped with "VisualADCP" software.
EFFECT: technical result consists in simplification of maintenance and use of device in expeditionary conditions due to arrangement of process of algorithmic processing of acoustic signals on user computer of high level, as well as expansion of functional capabilities of device.
1 cl, 5 dwg

Description

The device relates to the field of oceanology and hydrology, and in particular to the field of measuring the velocity of currents using reflection of acoustic waves, and can be used in hydrophysical studies to determine fluid flow rates in open environments (rivers, seas, oceans, etc.) and closed (channels, wells, pipelines, etc.), as well as for precision measurement of fluid flow.

The principle of operation of most modern instruments for measuring the flow rate of a liquid is based on the Doppler frequency shift of the signal reflected from inhomogeneities in water (suspension of solid particles, plankton, air bubbles). For example, according to patents US5483499, IPC G01S 15/58 publ. 01/09/96, and US 8223588, IPC (2006.01.) G01S 15/00 publ. 07/17/2012, an acoustic Doppler current meter known in the English literature as the Acoustic Doppler Current Profiler (ADCP), which periodically emits a pulsed ultrasonic signal, receives a reflected response and analyzes the frequency bias depending on the delay time of the reflected signal, i.e., in fact, depending on the distance to the heterogeneous reflectors. Due to the presence of three to four, and sometimes even more emitting heads mounted at an angle to each other, longitudinal velocity measurements can be converted into a three-dimensional Cartesian coordinate system, thus restoring the distribution of flow velocity vectors in a certain volume. A number of devices (especially those designed for rivers) are capable of calculating the flow rate of water in a river or canal using a specific technique based on data from the velocity field. Devices are installed either stationary or on the bottom of the vessel, operate in continuous data transfer modes or autonomously, with the results recorded in the built-in memory.

US 8223588 discloses a device for observing one (or more than one) oceanic process with a single instrument. This instrument is an acoustic Doppler current meter that monitors several processes, each with its own scales, including time scales, length scales and / or speed scales. During the observation process, the instrument optimizes the collection of data separately for each process that it observes.

An undoubted advantage of the acoustic Doppler flow meter described by US 8223588B2 is the ability to observe more than one oceanic process with sets of acoustic rays that are optimized specifically for each process.

Another important aspect of the invention described by US8223588B2 is the ability to simultaneously use two sets of probing acoustic beams - one of which is facing up and the other down. This feature can be used to double the range of profiling. In addition, in cases where speed measurements in the area close to the instrument are of interest, a third set of rays directed horizontally can be added to fill the data in the gap between the rays directed up and down.

The direct emission of sounding acoustic signals and the reception of echo signals is carried out by inclined piezoceramic transducers of a piston type.

The disadvantage of the analogue is the need to adapt to several processes and select the parameters of the acoustic rays during the measurement. The measurement result is due to the device settings made before the measurements, when changing the settings, it becomes necessary to conduct repeated measurements.

The work of most modern instruments for measuring the flow rate of liquids is based on similar principles.

To illustrate the foregoing, a portable system for profiling currents can be noted (patent US 9404744). The specified device has the main features of ADCP - a multi-beam transceiver head, the radiation / reception directions of which can be configured in different ways - depending on the conditions of use of the device; as well as a data analysis system (processor) and a system for transferring data to an external medium. The main disadvantage of this device is its suitability only for use in shallow water. In this case, two of the four acoustic rays claimed in the invention are in fact used for technical support of measurements - they measure the distance from the device to the bottom (the first "technical" sound beam) and from the device to the water edge (second "technical" sound beam ) Thus, only two out of four remain informative sound beams, one of which can be directed only horizontally, and only the last can be configured as a scanning “profiling” sound beam. Such a system is cheaper than classical ADCPs, and its use as a current and water flow rate meter in small rivers and streams can be justified, but it is certainly less informative and has less accuracy in measuring the flow velocity profile than the classical ADCP profiler, and, moreover, the product presented in this application. Data exchange in the specified device takes place only through the RS 232 communication channel, which under certain conditions can impose restrictions on the length of the data transmission channel, which in turn limits the application options of the device in case of a stationary installation, and also excludes the possibility of combining several devices into one network.

The closest in technical essence to the proposed product is an acoustic Doppler current meter described by patent US 5615173 IPC G01S 15/58 publ. 03/25/97, which is selected as a prototype for the claimed invention and is a device for measuring current velocities using broadband acoustic signals with a coded pulse. Autocorrelation of two-phase encoded pulses in water during one transceiver cycle is used to calculate the Doppler frequency.

The disadvantages of the prototype device include the following. Firstly, from the diagrams and drawings presented in the patent, the localization of computing power can be traced directly to the device case (built-in computing tools), which are in the water for expeditionary conditions. Such a device architecture implies the need to use powerful computing equipment, which is able to provide complex algorithmic processing in real time in the device’s built-in computing tools. Secondly, the claimed circuit solutions of the device do not provide for the exchange of data between submodules by means of high-speed communication channels (the known analogs and prototype use a slow communication channel RS 422/485).

The problem to which the present invention is directed, is the development of an acoustic Doppler current meter, which allows to simplify the maintenance and use of the device and expand its functionality, not only transfer the process of algorithmic processing to an external computing device, but also completely organize it on a high-level user computer . Another objective is to reduce the time of data exchange during processing, expand the scope of the device due to the possibility of processing primary data on a computer equipped with special software.

The specified technical result is achieved due to the fact that the developed acoustic Doppler current meter, as well as the prototype, contains four transceiver channels, a processor and built-in memory, structurally enclosed in one case, as well as a power supply, data processing unit, and a RS 485 communication channel, moreover each of the transceiver channels contains a serially connected transceiver head, a transceiver module, an amplifier, an analog-to-digital converter.

New in the developed acoustic Doppler flow meter is that the four transceiver channels are connected to the processor via a programmable logic integrated circuit, the data processing unit is implemented on an external computing device, the processor is connected to the external computing device with a high-speed communication channel, and the external computing device is equipped with a software Visual ADCP software.

Such a construction of an acoustic Doppler flow meter in accordance with paragraph 1 of the formula avoids complex manipulations to extract accumulated data, reconfigure the device and its software to new operation algorithms, and also allows for a “hot” transition from algorithm to algorithm, and their combination and joint data processing when implementing several algorithms simultaneously. The presence of a high-speed communication channel and Visual ADCP software in the proposed device makes it possible to send primary data received directly from the receiving-radiating head to an external computing device, perform analysis, visualization, data processing, and constructing a flow velocity profile in the data processing unit (external computing device) .

In the particular case of the implementation of the developed acoustic Doppler current meter, it is advisable to connect the data processing unit (external computing device) to the processor with a high-speed Ethernet 1 OOBase-TX communication channel. The possibility of using an internal (battery pack) and / or external power source is implied.

The invention is illustrated by drawings:

In FIG. 1 is a diagram of a technical implementation of an acoustic Doppler current meter.

In FIG. 2 shows a general view of the housing of an acoustic Doppler current meter without a battery pack in a 1: 4 scale.

In FIG. Figure 3 shows a general view of the housing of an acoustic Doppler current meter with a battery pack in a 1: 4 scale.

In FIG. Figure 4 shows an option for installing an acoustic Doppler current meter at the bottom.

In FIG. 5 shows an installation option of an acoustic Doppler current meter on the bottom of the vessel.

The developed acoustic Doppler current meter contains four identical transceiver channels, structurally enclosed in one housing, connected to a programmable logic integrated circuit 5 connected to a processor 6 connected to the internal memory 7. Moreover, each of the transceiver channels includes a series-connected transceiving head 1, transceiver module 2, amplifier 3 and analog-to-digital converter 4. Processor 6 through two communication channels: slow 8 (RS 485) and high-speed 9 (Ethernet) is connected to an external computing device 10.

The developed acoustic Doppler current meter is equipped with an external power source 11 and an integrated power source 12.

In the particular case of the implementation of the developed acoustic Doppler current meter, the acoustic head manufactured by Meduza LLC (Nizhny Novgorod) was used as the receiving-emitting head 1, the AD7766 family converter was used as an analog-to-digital converter 4, and FPGA as a programmable logic integrated circuit 5 Cyclone V family, processor 6 - ADSP BF518 family, internal memory 7 - with a capacity of 128 GB microSD format. Also used is a high-speed communication channel 9 - Ethernet 100 Base-TX, which allows data exchange at a speed of up to 100 Mbaud (approximately 10 Mb / s). The built-in power supply 12 is a battery, the external power supply 11 is a stationary power supply. As an external computing device 10, a computer or laptop is used with the VisualADCP software installed.

The developed acoustic Doppler current meter works as follows. Parallel operation of all four transceiver channels is possible, however, to exclude mutual influence (receiving reflected pulses emitted by another head), the transceiver channels work sequentially. The operation of the device is shown on the example of one transceiver channel.

The emitting signal is fed to the receiving-radiating head 1 from the data processing unit (external computing device) 10 through an Ethernet communication channel 9 and / or RS485 communication channel 8, processor 6, programmable logic integrated circuit 5, analog-to-digital converter 4, amplifier 3, and transceiver module 2 in transmission mode. Next, the acoustic Doppler current meter switches to receive mode.

The reflected acoustic signal is received by the receiving-emitting head 1 operating in the receiving mode, and then arriving through the receiving-transmitting module 2 in the receiving mode, an amplifier 3, an analog-to-digital converter 4, a programmable logic integrated circuit 5, processor 6, an Ethernet communication channel 9 and / or a channel RS485 8 communication to the data processing unit 10. Simultaneously, data is accumulated in the internal memory 7. Power is supplied from an external 11 or internal 12 power supply.

The control and setting of the programmable logic integrated circuit 5 modes is carried out by the processor 6. It has a ROM for storing the configuration programs of the programmable logic integrated circuit 5, drivers for communication with an external computing device 10 via Ethernet channel 9.

The control of the analog-to-digital converter 4 is carried out from the processor 6 through a programmable logic integrated circuit 5. The processor 6 sets the operation mode, clock frequencies and bandwidth. After conversion, the digital signals in sequential form are fed into a programmable logic integrated circuit 5 for further processing or for transmitting the entire receiving raw signal data array to an external computing device 10.

Amplifier 3 is controlled via a standard Ethernet port. The processor 6 receives the parameters (amplitude, frequency, phase, number of simultaneously emitted frequencies) of the signals for each transceiver channel, loads these parameters into a programmable logic integrated circuit 5, which generates complex signals according to the given parameters.

Control of signal transceiver, their processing, visualization and analysis of the results is carried out using the Visual ADCP software.

The Visual ADCP software, which is a development of the authors, allows you to control an extended set of parameters of signal emission / reception, write ADC data to a real-time file, reproduce recorded data, completely emulate the work with the device, and restore three components of the flow velocity relative to absolute spatial coordinates.

A feature of the proposed acoustic Doppler current meter according to claim 1 of the formula is: the presence of a programmable logic integrated circuit 5 controlled by a high-speed communication channel 9 by an external computing device 10. Also, a feature of the proposed acoustic Doppler current meter according to claim 1 is that the main unit and the data processing unit 10 are connected, in addition to the slow communication channel 8 (RS485), a high-speed communication channel 9 (according to claim 2 of the Ethernet 100Base-TX formula). This allows you to send to the data processing unit 10 primary data received directly from the receiving-emitting head 1.

Also, a feature of the proposed acoustic Doppler current meter according to claim 1 of the formula is that the registration, processing, visualization and analysis of data in an external computing device 10 is carried out using the Visual ADCP software. This allows you to perform various actions with signals and apply various algorithms by developing additional software functions.

This circumstance avoids the need to implement complex algorithmic processing in real time in the built-in computing tools of the device and completely transfer it to an external high-level user computer.

When the device is operating in standalone mode, sufficient flash memory capacity allows you to store the received temporary implementation of the signals. There is no need to accumulate processing results, since all accepted “raw” temporary implementations are recorded, to which processing with various parameters can be applied. High-level software has direct access to this data, it has built-in functions for processing the accumulated data at various selected parameter values, and for “playing back" them, creating a complete simulation of working with a real device.

Thus, the proposed acoustic Doppler current meter allows you to organize the process of algorithmic processing of the received acoustic signals on a high-level user computer, which greatly simplifies the maintenance and use of the device in expeditionary conditions, and also extends its functionality, that is, it allows you to solve the problem. The possibility of such processing expands the scope of the device.

Claims (2)

1. An acoustic Doppler current meter containing four transceiver channels, a processor and built-in memory, structurally enclosed in a single housing, as well as a power supply unit, a data processing unit, a RS 485 communication channel, each of the transceiver channels containing a transceiving head, a transceiver module , amplifier, analog-to-digital converter, characterized in that the said four transceiver channels are connected to the processor through a programmable logic integral scheme, a data processing unit implemented on an external computing device, the processor connected to the external computing device high-speed link, wherein the external computer device is provided with software «Visual ADCP».
2. An acoustic Doppler current meter according to claim 1, characterized in that the data processing unit is connected to the processor by a high-speed Ethernet 100Base-TX communication channel.
RU2019116478A 2019-05-28 2019-05-28 Acoustic doppler current meter RU2710527C1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2154287C1 (en) * 1999-01-25 2000-08-10 Институт проблем морских технологий Дальневосточного отделения РАН Method measuring absolute speed of movement of underwater object and device for its implementation
RU75062U1 (en) * 2008-02-15 2008-07-20 Федеральное Государственное Образовательное Учреждение Высшего Профессионального Образования "Южный Федеральный Университет" Doppler location system
RU2357269C2 (en) * 2007-07-11 2009-05-27 Государственное общеобразовательное учреждение высшего профессионального образования "Уральский государственный технический университет-УПИ" Method for detecting moving targets by sonar and device to this end
RU2466425C1 (en) * 2011-06-01 2012-11-10 Учреждение Российской академии наук Институт прикладной физики РАН Method of measuring characteristics of wavy water surface
US20140230567A1 (en) * 2013-02-21 2014-08-21 Rowe Technologies, Inc. Acquatic velocity scanning apparatus and methods
RU2562001C1 (en) * 2014-05-21 2015-09-10 Закрытое акционерное общество "Ассоциация предприятий морского приборостроения" Inspection method of doppler current velocity meter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2154287C1 (en) * 1999-01-25 2000-08-10 Институт проблем морских технологий Дальневосточного отделения РАН Method measuring absolute speed of movement of underwater object and device for its implementation
RU2357269C2 (en) * 2007-07-11 2009-05-27 Государственное общеобразовательное учреждение высшего профессионального образования "Уральский государственный технический университет-УПИ" Method for detecting moving targets by sonar and device to this end
RU75062U1 (en) * 2008-02-15 2008-07-20 Федеральное Государственное Образовательное Учреждение Высшего Профессионального Образования "Южный Федеральный Университет" Doppler location system
RU2466425C1 (en) * 2011-06-01 2012-11-10 Учреждение Российской академии наук Институт прикладной физики РАН Method of measuring characteristics of wavy water surface
US20140230567A1 (en) * 2013-02-21 2014-08-21 Rowe Technologies, Inc. Acquatic velocity scanning apparatus and methods
US9823104B2 (en) * 2013-02-21 2017-11-21 Rowe Technologies, Inc. Acquatic velocity scanning apparatus and methods
RU2562001C1 (en) * 2014-05-21 2015-09-10 Закрытое акционерное общество "Ассоциация предприятий морского приборостроения" Inspection method of doppler current velocity meter

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