CN111220815A - Wireless transmission ultrasonic current meter and speed measuring method based on GPS signal synchronization - Google Patents
Wireless transmission ultrasonic current meter and speed measuring method based on GPS signal synchronization Download PDFInfo
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- CN111220815A CN111220815A CN202010061874.3A CN202010061874A CN111220815A CN 111220815 A CN111220815 A CN 111220815A CN 202010061874 A CN202010061874 A CN 202010061874A CN 111220815 A CN111220815 A CN 111220815A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
- G01P5/245—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by measuring transit time of acoustical waves
Abstract
The invention discloses a wireless transmission ultrasonic current meter based on GPS signal synchronization, which comprises a host machine and an auxiliary machine which are in communication connection through a wireless network, wherein the host machine comprises a controller, an FPGA module, a GPS module and a wireless communication module which are respectively connected with the controller, and an energy converter for transmitting or receiving ultrasonic signals, wherein the energy converter is connected with the FPGA module; the composition structure of the auxiliary machine is the same as that of the main machine. The invention also discloses a speed measuring method adopting the wireless transmission ultrasonic current meter. Compared with a wired cable connection mode, the flow meter main machine and the auxiliary machine are in communication connection through a wireless network, are not limited by the width of a fluid channel, solve the problem that the wide water area cannot be installed, and are easy to arrange and good in practicability when measuring the flow rate of the fluid; the main machine and the auxiliary machine of the current meter carry out clock synchronization through GPS signals, and the measurement precision is high.
Description
Technical Field
The invention belongs to the field of fluid flow velocity measurement, and particularly relates to a wireless transmission ultrasonic flow velocity meter and a speed measurement method based on GPS signal synchronization.
Background
The time difference method measures the average flow velocity of the end face of the river (channel), and utilizes the characteristic that the propagation velocity of sound waves is different due to the difference of the flow directions of the fluid when the sound waves propagate in the fluid to measure the difference between the downstream propagation time t1 and the upstream propagation time t2, so as to calculate the flow velocity of the fluid, as shown in fig. 1.
The existing wired ultrasonic current meter consists of a host, 2 equal-length long cables and 1 pair of transducers, as shown in figure 2. The transducer A, B is connected to the host computer through a long cable to ensure that 2 transducers on both sides of the fluid channel transmit and receive each other based on a local synchronous clock. When the equipment is deployed on a river (canal) channel, a long cable connected with an opposite-shore energy converter needs to cross the river (canal) channel in a mode of sinking to the water bottom or erecting in the air, the arrangement is difficult to realize when the water flow velocity of the wide river (canal) channel is measured, the installation cannot be basically realized when the water surface is too wide, the requirements on the performance of the cable are high, the demand is large, the installation cost is high, the application range is narrow, and the popularization is difficult.
Disclosure of Invention
The invention has the technical problems that the existing cable cross-fluid channel arrangement of the wired ultrasonic current meter by utilizing the time difference method increases the deployment and installation difficulty, particularly the cable is abnormally difficult to arrange even cannot be installed under the condition of wide fluid channel, the requirements on the performance of the cable are high, the demand is large, the installation cost is high, the application range is narrow, and the popularization is difficult.
The invention aims to solve the problems and provides a wireless transmission ultrasonic current meter and a speed measuring method based on GPS signal synchronization.
The technical scheme of the invention is that the wireless transmission ultrasonic current meter based on GPS signal synchronization comprises a host machine and an auxiliary machine which are in communication connection through a wireless network, wherein the host machine comprises a controller, an FPGA module, a GPS module and a wireless communication module which are respectively connected with the controller, and an energy converter for transmitting or receiving ultrasonic signals, wherein the energy converter is connected with the FPGA module; the composition structure of the auxiliary machine is the same as that of the main machine; the FPGA module is used for signal modulation, analog-to-digital conversion and signal processing; the GPS module is used for receiving GPS signals of satellites.
Preferably, the host comprises a plurality of transducers, and the transducers are respectively connected with the FPGA module of the host through one-out-of-multiple selectors.
Preferably, the auxiliary machine comprises a plurality of transducers, and the transducers are respectively connected with the FPGA module of the auxiliary machine through a one-out-of-multiple selector.
Further, the host computer also comprises a display terminal connected with the controller.
Preferably, the controller is a single chip microcomputer.
The speed measuring method of the wireless transmission ultrasonic flow velocity meter based on GPS signal synchronization is utilized, the transducer of the main machine is arranged at one side of the fluid channel, the transducer of the auxiliary machine is arranged at the other side of the fluid channel, a connecting line of the transducer of the main machine and the transducer of the auxiliary machine forms a certain included angle with the flowing direction of the fluid, the fluid flows to the transducer of the auxiliary machine through the transducer of the main machine, the speed measuring method comprises the following steps,
step 1: the host machine and the auxiliary machine respectively utilize GPS signals to carry out clock synchronization;
step 2: the host machine and the auxiliary machine synchronously transmit ultrasonic signals in turn according to the GPS;
and step 3: the transducer of the auxiliary machine receives the ultrasonic signal transmitted by the transducer of the main machine and records the receiving time of the ultrasonic signal;
and 4, step 4: the transducer of the main machine receives the ultrasonic signal transmitted by the transducer of the auxiliary machine and records the receiving time of the ultrasonic signal;
and 5: and (4) calculating the flow velocity of the fluid by the host according to a time difference method calculation formula by adopting a time difference method.
Compared with the prior art, the invention has the beneficial effects that:
1) compared with a wired cable connection mode, the flow meter main machine and the auxiliary machine are in communication connection through a wireless network, are not limited by the width of a fluid channel, and are easy to arrange and good in practicability when measuring the flow rate of the fluid;
2) the main machine and the auxiliary machine of the current meter perform clock synchronization through GPS signals, and the measurement precision is high;
3) the main engine and the auxiliary engine of the current meter are provided with a plurality of energy converters, and selection is performed through a multi-selection selector, so that the reliability of the current meter is improved.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic diagram of the principle of measuring the flow rate of a fluid by a time difference method.
Fig. 2 is a schematic diagram of an ultrasonic flow meter with a wired connection.
Fig. 3 is a schematic view of an ultrasonic flow meter of the present invention.
Fig. 4 is a block diagram showing the structure of the ultrasonic flow meter of the present invention.
Description of reference numerals: the system comprises a controller 1, an FPGA module 2, a transducer 3, a wireless communication module 4, a GPS module 5, a one-out-of-many selector 6 and a display terminal 7.
Detailed Description
As shown in fig. 3 and 4, the wireless transmission ultrasonic current meter based on GPS signal synchronization is used for measuring the current velocity of a river channel, and includes a host and an auxiliary machine connected via wireless network communication, the host includes a controller 1, and an FPGA module 2, a GPS module 5, a wireless communication module 4 respectively connected thereto, and also includes 3 transducers 3 for transmitting or receiving ultrasonic signals, the transducers 3 are connected to the FPGA module 2; the composition structure of the auxiliary machine is the same as that of the main machine; the FPGA module 2 is used for signal modulation, analog-to-digital conversion and signal processing; the GPS module 5 is used to receive GPS signals of satellites. In one embodiment, the controller 1 is a single chip microcomputer. The transducers 3 are respectively connected with the FPGA module 2 through a one-out-of-multiple selector 6. The display terminal 7 is connected to the controller 1 via a data bus. The wireless communication module 4 of the main machine is in communication connection with the wireless communication module 4 of the auxiliary machine through a wireless network.
A speed measuring method of wireless transmission ultrasonic current meter based on GPS signal synchronization, which arranges an energy converter of a main machine at one side of a river channel and an energy converter of an auxiliary machine at the other side of the river channel, wherein a connecting line of the energy converter of the main machine and the energy converter of the auxiliary machine forms a certain included angle with the flowing direction of water flow, and the water flow flows to the energy converter of the auxiliary machine through the energy converter of the main machine, the speed measuring method comprises the following steps,
step 1: the host machine and the auxiliary machine respectively utilize GPS signals to carry out clock synchronization;
step 2: the host machine and the auxiliary machine synchronously transmit ultrasonic signals in turn according to the GPS;
and step 3: the transducer of the auxiliary machine receives the ultrasonic signal transmitted by the transducer of the main machine and records the receiving time of the ultrasonic signal;
and 4, step 4: the transducer of the main machine receives the ultrasonic signal transmitted by the transducer of the auxiliary machine and records the receiving time of the ultrasonic signal;
and 5: and (4) calculating the flow velocity of the fluid by the host according to a time difference method calculation formula by adopting a time difference method.
As shown in fig. 1, the time difference method depends on the time difference at which the transducers receive ultrasonic signals simultaneously transmitted by the opposite transducers,
Δt＝t2-t1(1)
Vp＝V cosα (4)
wherein L is the distance between the transducer A and the transducer B, C is the sound velocity in the fluid, V is the fluid flow velocity, α is the installation angle of the transducer relative to the fluid channel, V is the installation angle of the transducer relative to the fluid channelpThe velocity component of the fluid flow velocity in the direction of the transducer, t1Is the propagation time, t, of the ultrasonic signal from transducer A to transducer B2Is the travel time of the ultrasonic signal from transducer B to transducer A;
by combining the formulas (1), (2), (3) and (4), the product can be obtained
Since the fluid flow velocity is much less than the sound velocity in the fluid, i.e. V < C, it can be obtained from the formula (5)
After transformation, can obtain
In step 6, the flow velocity of the water flow can be calculated by using the formula (6).
In the embodiment, the wireless transmission ultrasonic current meter does not need to be provided with a cable crossing a river channel, so that the length of the cable is shortened, the installation is simple, and the cost is low; the method is not limited by the width of the river channel and has wide application range; the measurement precision is high, and the real-time is good.
Claims (5)
1. The wireless transmission ultrasonic current meter based on GPS signal synchronization is characterized by comprising a host machine and an auxiliary machine which are in communication connection through a wireless network, wherein the host machine comprises a controller, an FPGA module, a GPS module and a wireless communication module which are respectively connected with the controller, and an energy converter used for transmitting or receiving ultrasonic signals, wherein the energy converter is connected with the FPGA module; the composition structure of the auxiliary machine is the same as that of the main machine; the FPGA module is used for signal modulation, analog-to-digital conversion and signal processing; the GPS module is used for receiving GPS signals of satellites.
2. The GPS signal synchronization-based wireless transmission ultrasonic current meter according to claim 1, comprising a plurality of transducers, wherein the transducers are connected to the FPGA module via one-out-of-many selectors, respectively.
3. The GPS signal synchronized wireless-transmission ultrasonic current meter according to claim 1, wherein the host further comprises a display terminal connected to the controller.
4. The GPS signal synchronization-based wireless transmission ultrasonic current meter according to claim 1, wherein the controller is a single chip microcomputer.
5. A method for measuring velocity of ultrasonic wave using wireless transmission ultrasonic wave velocity meter based on GPS signal synchronization of any claim 1-4, characterized in that, the transducer of the main machine is arranged at one side of the fluid channel, the transducer of the auxiliary machine is arranged at the other side of the fluid channel, the connecting line of the transducer of the main machine and the transducer of the auxiliary machine forms a certain angle with the flowing direction of the fluid, the velocity measuring method comprises the following steps,
step 1: the host machine and the auxiliary machine respectively utilize GPS signals to carry out clock synchronization;
step 2: the host machine and the auxiliary machine synchronously transmit ultrasonic signals in turn according to the GPS;
and step 3: the transducer of the auxiliary machine receives the ultrasonic signal transmitted by the transducer of the main machine, records the receiving time of the ultrasonic signal and transmits the ultrasonic signal to the main machine through wireless communication;
and 4, step 4: the transducer of the main machine receives the ultrasonic signal transmitted by the transducer of the auxiliary machine and records the receiving time of the ultrasonic signal;
and 5: and (4) calculating the flow velocity of the fluid by the host according to a time difference method calculation formula by adopting a time difference method.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917185A (en) * | 2021-10-22 | 2022-01-11 | 浙江天禹信息科技有限公司 | Acoustic full-section flow meter and working method thereof |
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2020
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| CN101769778A (en) * | 2008-12-31 | 2010-07-07 | 中国神华能源股份有限公司 | Real-time monitoring method and system of water depth in port channel |
| CN202002682U (en) * | 2011-01-05 | 2011-10-05 | 中国海洋石油总公司 | Ultrasonic device for measuring annular instantaneous flow rate between marine riser and drill column |
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| CN113917185A (en) * | 2021-10-22 | 2022-01-11 | 浙江天禹信息科技有限公司 | Acoustic full-section flow meter and working method thereof |
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Application publication date: 20200602 |