CN113552383A - Bidirectional Doppler velocimeter and bidirectional Doppler velocimetry method - Google Patents
Bidirectional Doppler velocimeter and bidirectional Doppler velocimetry method Download PDFInfo
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- CN113552383A CN113552383A CN202110866127.1A CN202110866127A CN113552383A CN 113552383 A CN113552383 A CN 113552383A CN 202110866127 A CN202110866127 A CN 202110866127A CN 113552383 A CN113552383 A CN 113552383A
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- 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
- G01P5/241—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 using reflection of acoustical waves, i.e. Doppler-effect
Abstract
The embodiment of the invention discloses a bidirectional Doppler velocimeter and a bidirectional Doppler velocimeter method. The system comprises a control module, a clock module, two transmitting modules and two receiving modules, wherein the transmitting modules, the receiving modules and the clock module are connected with the control module; the control module is used for controlling the clock module to provide a first electric signal for the transmitting module, and the transmitting module transmits a sound wave signal according to the first electric signal; the receiving module is used for receiving a reflected wave signal generated after the sound wave signal is reflected and generating a second electric signal according to the reflected wave signal; the clock module is used for providing a zero mixing signal for the receiving module; the receiving module is further used for processing the second electric signal according to the zero mixing signal; the control module is also used for collecting second electric signals processed by the two receiving modules and determining the water flow direction and the water flow speed according to the second electric signals processed by the two receiving modules. This scheme can improve the accuracy that rivers were tested the speed.
Description
Technical Field
The embodiment of the invention relates to the technical field of sensors, in particular to a bidirectional Doppler velocimeter and a bidirectional Doppler velocimetry method.
Background
In the prior art, a current meter with a direction recognition function is designed with a high-frequency mixing point, and if the frequency with partial carrier waves collected by the current meter is greater than the frequency of the mixing point, the current direction is represented as a forward direction; if the frequency with partial carrier waves collected by the current meter is less than the frequency of the mixing point, the water flow direction is represented to be negative, and therefore the water flow direction is identified. However, the frequency of the mixing point of the high-frequency mixing point is not at zero, which not only results in high starting point and measuring point of the collected frequency with partial carrier, but also results in low accuracy of the collected frequency with partial carrier, and thus the accuracy of the measured water flow velocity is low.
Disclosure of Invention
The embodiment of the invention provides a bidirectional Doppler velocimeter and a bidirectional Doppler velocimeter method, which aim to improve the accuracy of water flow velocity measurement.
In a first aspect, an embodiment of the present invention provides a bidirectional doppler velocimeter, which includes a control module, a clock module, two transmitting modules, and two receiving modules, where the transmitting modules, the receiving modules, and the clock module are connected to the control module, and the transmitting modules and the receiving modules are connected to the clock module; the control module is used for controlling the clock module to provide a first electric signal for the transmitting module, and the transmitting module transmits a sound wave signal according to the first electric signal; the receiving module is used for receiving a reflected wave signal generated after the sound wave signal is reflected and generating a second electric signal according to the reflected wave signal; the clock module is used for providing a zero mixing signal for the receiving module; the receiving module is further used for processing a second electric signal according to the zero mixing signal; the control module is also used for collecting second electric signals processed by the two receiving modules and determining the water flow direction and the water flow speed according to the second electric signals processed by the two receiving modules.
Optionally, a transmitting module and a receiving module form a group of transmitting and receiving groups;
the transmitting and receiving groups are arranged on the water-facing side of the bidirectional Doppler velocimeter and are used for measuring the flow velocity of water flow in the water-facing direction; and the other group of transmitting and receiving groups are arranged on the backwater side of the bidirectional Doppler velocimeter and are used for measuring the flow velocity of water flow in the backwater direction.
Optionally, the transmitting module comprises a first signal processing unit and a first transducer;
the control module and the clock module are connected with the first signal processing unit, and the control module is used for controlling the clock module to provide a first electric signal for the first signal processing unit; the first signal processing unit is connected with the first transducer and used for processing a first electric signal and transmitting the first electric signal to the first transducer; the first transducer is used for converting the first electric signal processed by the first electric signal processing unit into an acoustic wave signal.
Optionally, the first signal processing unit includes a driving subunit, a harmonic oscillator subunit, and a transforming subunit;
the control module and the clock module are connected with the driving subunit, the driving subunit is connected with the harmonic oscillator unit, the harmonic oscillator unit is connected with the voltage transformation subunit, and the voltage transformation subunit is connected with the first transducer; the driving subunit is used for amplifying the first electric signal, the resonance subunit is used for converting the first electric signal into a resonance signal, the voltage transformation subunit is used for adjusting the resonance signal, and the first transducer is used for converting the resonance signal adjusted by the voltage transformation subunit into a sound wave signal.
Optionally, the first transducer comprises an ultrasound transmitting probe;
the ultrasonic emission probe is connected with the voltage transformation subunit and is used for converting the resonance signal regulated by the voltage transformation subunit into a sound wave signal.
Optionally, the receiving module comprises a second signal processing unit and a second transducer;
the second transducer, the control module and the clock module are connected with the second signal processing unit; the second transducer is used for receiving the reflected wave signal and converting the reflected wave signal into a second electric signal; the second signal processing unit is used for receiving the zero mixing signal provided by the clock module and processing a second electric signal according to the zero mixing signal and transmitting the second electric signal to the control module.
Optionally, the second signal processing unit includes an amplifying subunit, a mixing subunit, and a filtering subunit;
the second transducer is connected with the amplifying subunit, the amplifying subunit is connected with the frequency mixing subunit, the frequency mixing subunit is connected with the filtering subunit and the clock module, and the filtering subunit is connected with the control module; the amplifying subunit is used for amplifying the second electric signal, the mixing subunit is used for modulating the amplified second electric signal to generate a modulation signal, and the filtering subunit is used for filtering noise signals in the modulation signal.
Optionally, the second transducer comprises an ultrasound receiving probe;
the ultrasonic receiving probe is connected with the amplifying unit and used for receiving the sound wave signal transmitted by the transmitting module and converting the sound wave signal into a second electric signal.
Optionally, the bidirectional doppler velocimeter further comprises a storage module;
the storage module is connected with the control module and used for storing the second electric signals collected by the control module and processed by the two receiving modules.
In a second aspect, an embodiment of the present invention further provides a bidirectional doppler velocity measurement method, including:
the control module controls the clock module to provide a first electric signal for the transmitting module;
the transmitting module transmits a sound wave signal according to the first electric signal;
the receiving module receives a reflected wave signal generated after the sound wave signal is reflected, and generates a second electric signal according to the reflected wave signal;
the clock module provides a zero mixing signal for the receiving module;
the receiving module processes the second electric signal according to the zero mixing signal;
the control module collects the second electric signals processed by the two receiving modules and determines the water flow direction and the water flow speed according to the second electric signals processed by the two receiving modules.
In conclusion, the scheme controls the transmitting module to transmit the sound wave signal to the water through the control module and the clock module, utilizes the characteristic that the sound wave signal can be reflected by fine particles such as plankton in the water to generate a reflected wave signal, receives the reflected wave signal through the receiving module and converts the reflected wave signal into a second electric signal. In addition, the receiving module can filter the mixing signal contained in the second electrical signal by using the zero mixing signal provided by the clock signal, so as to realize zero mixing of the second electrical signal, that is, obtain the second electrical signal only containing the water flow velocity information. The second electric signal which only contains the water flow velocity information is transmitted to the control module, so that the data acquired by the control module are more accurate, and the control module calculates the accuracy of the water flow velocity corresponding to the second electric signal processed by the two receiving modules to be higher. In addition, the control module compares the flow rates of the water flows corresponding to the second electric signals processed by the two receiving modules, and the accuracy of the determined water flow direction is higher.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description, although being some specific embodiments of the present invention, can be extended and extended to other structures and drawings by those skilled in the art according to the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention, without making sure that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic structural diagram of a bidirectional doppler velocimeter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another bidirectional doppler velocimeter provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another bidirectional doppler velocimeter according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another bidirectional doppler velocimeter provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another bidirectional doppler velocimeter provided in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another bidirectional doppler velocimeter according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another bidirectional doppler velocimeter according to an embodiment of the present invention;
fig. 8 is a schematic flow chart of a bidirectional doppler velocity measurement method according to an embodiment of the present invention;
fig. 9 is a schematic flow chart of another bidirectional doppler velocity measurement method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a bidirectional doppler velocimeter, and fig. 1 is a schematic structural diagram of the bidirectional doppler velocimeter provided in the embodiment of the present invention. As shown in fig. 1, the two-way doppler velocimeter includes a control module 110, a clock module 120, two transmitting modules 130 and two receiving modules 140, wherein the transmitting modules 130, the receiving modules 140 and the clock module 120 are connected to the control module 110, and the transmitting modules 130 and the receiving modules 140 are connected to the clock module 120; the control module 110 is configured to control the clock module 120 to provide a first electrical signal to the transmitting module 130, and the transmitting module 130 transmits a sound wave signal according to the first electrical signal; the receiving module 140 is configured to receive a reflected wave signal generated after the acoustic wave signal is reflected, and generate a second electrical signal according to the reflected wave signal; the clock module 120 is configured to provide a zero-mixing signal for the receiving module 140; the receiving module 140 is further configured to process the second electrical signal according to the zero-mixing signal; the control module 110 is further configured to collect the second electrical signals processed by the two receiving modules 140, and determine a water flow direction and a water flow rate according to the second electrical signals processed by the two receiving modules 140.
The bidirectional Doppler velocimeter is a velocimeter manufactured by applying the acoustic Doppler effect principle. The two-way doppler velocimeter is composed of a control module 110, a clock module 120, two transmitting modules 130 and two receiving modules 140. Specifically, the transmitting module 130, the receiving module 140 and the clock module 120 are connected to the control module 110, and the transmitting module 130 and the receiving module 140 are connected to the clock module 120. The control module 110 may control the clock module 120 to provide the first electrical signal to the transmitting module 130, and the transmitting module 130 converts the first electrical signal into a sound wave signal and transmits the sound wave signal into the water flow. One of the transmitting modules 130 transmits a sound wave signal in the direction of facing water, and the other transmitting module 130 transmits a sound wave signal in the direction of backing water. When the acoustic wave signal propagates through water, it is reflected by fine particles such as plankton in the water (collectively referred to as scatterers, and the flow velocity of the scatterers is equal to the water flow velocity) to generate a reflected wave signal. The two receiving modules 140 are used for receiving reflected wave signals generated by reflection of fine particles such as plankton in the water flow, wherein one receiving module 140 is used for receiving reflected wave signals in the water-facing direction, and the other receiving module 140 is used for receiving reflected wave signals in the water-backing direction. The receiving module 140 receives the reflected wave signal and converts the reflected wave signal into a second electrical signal, and at the same time, the clock module 120 sends a zero-mixing signal to the receiving module 140, and the receiving module 140 processes the second electrical signal by using the zero-mixing signal. The receiving module 140 sends the processed second electrical signals to the control module 110, and the control module 110 collects the second electrical signals processed by the two receiving modules 140 respectively, and calculates the water flow rates corresponding to the second electrical signals processed by the two receiving modules 140 according to the doppler relation expression. In addition, the control module 110 compares the flow rates of the water flows corresponding to the data collected by the two receiving modules 140 (the flow rate measured in the upstream direction is greater than the flow rate measured in the downstream direction), and determines the flow direction.
In summary, in the present embodiment, the control module 110 and the clock module 120 control the transmitting module 130 to transmit the sound wave signal into the water, and the receiving module 140 receives the reflected wave signal and converts the reflected wave signal into the second electrical signal by utilizing the characteristic that the sound wave signal is reflected by fine particles such as plankton in the water to generate the reflected wave signal. In addition, the receiving module 140 may filter the mixing signal included in the second electrical signal by using the zero mixing signal provided by the clock signal, so as to implement zero mixing of the second electrical signal, that is, obtain the second electrical signal only containing the information of the water flow velocity. The second electrical signal only containing the water flow rate information is transmitted to the control module 110, so that the data acquired by the control module 110 is more accurate, and the control module 110 calculates the water flow rate corresponding to the second electrical signal processed by the two receiving modules 140 with higher accuracy. In addition, the control module 110 compares the flow rates of the water flows corresponding to the second electrical signals processed by the two receiving modules 140, and the determined water flow direction has higher accuracy.
Fig. 2 is a schematic structural diagram of another bidirectional doppler velocimeter according to an embodiment of the present invention. As shown in fig. 2, a transmitting module 130 and a receiving module 140 form a set of transmitting and receiving groups 101; the group of transmitting and receiving groups 101 is arranged on the water-facing side A of the bidirectional Doppler velocimeter and is used for measuring the flow velocity of water flow in the water-facing direction; the other group of transmitting and receiving groups 101 is arranged on the backwater side B of the two-way doppler velocimeter and is used for measuring the flow velocity of water flow in the backwater direction.
Wherein, a transmitting module 130 and a receiving module 140 constitute a set of transmission receiving group 101, it is obvious that two-way doppler velocimeter includes two sets of transmission receiving group 101, two sets of transmission receiving group 101 set up respectively in two-way doppler velocimeter's upstream side a and two-way doppler velocimeter's dorsal scale B, so two sets of transmission receiving group 101 can accurately measure the velocity of water flow in the upstream direction and the velocity of water flow in the dorsal direction simultaneously, thereby make two-way doppler velocimeter obtain the velocity of water flow in the upstream direction and the velocity of water flow in the dorsal direction simultaneously.
Illustratively, with continued reference to fig. 2, the water flow direction is V, a water facing side a of the two-way doppler velocimeter is provided with one set of transmit-receive groups 101, and a water backing side B of the two-way doppler velocimeter is provided with another set of transmit-receive groups 101. The working principle is as follows: the sound wave signal sent by the transmitting module 130 in the transmitting and receiving group 101 on the water-facing side a of the two-way doppler velocimeter meets the particle h1 in water and is reflected, the reflected sound wave signal f1 generated by particle reflection is received by the receiving module 140 on the water-facing side a of the two-way doppler velocimeter, and the controller can obtain the water flow velocity V1 after the reflected sound wave signal f1 is processed by the receiving module 140. Similarly, the sound wave signal sent by the transmitting module 130 in the transmitting and receiving group 101 on the backwater side B of the two-way doppler velocimeter encounters the particle h2 in water to be reflected, the reflected sound wave signal f2 generated by particle reflection is received by the receiving module 140 on the upstream side B of the two-way doppler velocimeter, and the controller can obtain the water flow velocity V2 after the reflected sound wave signal f2 is processed by the receiving module 140. The control module of the two-way Doppler velocimeter acquires the water flow velocity V1 on the upstream side and the water flow velocity V2 on the downstream side at a certain frequency, compares the average velocity V11 of the water flow velocity V1 with the average velocity V22 of the water flow velocity V2 in a period of time, and compares the average velocity V11 with the average velocity V22. As shown in fig. 2, the flow velocity V1 of the water stream on the upstream side is greater than the flow velocity V2 of the water stream on the downstream side, so that the flow direction is V and the flow velocity is V11.
Fig. 3 is a schematic structural diagram of another bidirectional doppler velocimeter according to an embodiment of the present invention. As shown in fig. 3, the transmitting module 130 includes a first signal processing unit 131 and a first transducer 132; the control module 110 and the clock module 120 are connected to the first signal processing unit 131, and the control module 110 is configured to control the clock module 120 to provide the first signal processing unit 131 with a first electrical signal; the first signal processing unit 131 is connected to the first transducer 132, and the first signal processing unit 131 is configured to process the first electrical signal and transmit the first electrical signal to the first transducer 132; the first transducer 132 is used to convert the first electrical signal processed by the first signal processing unit 131 into an acoustic wave signal.
The transmitting module 130 mainly includes a first signal processing unit 131 and a first transducer 132. Specifically, the control module 110 and the clock module 120 are connected with the first signal processing unit 131, so that the control module 110 can transmit the first electric signal to the first signal processing unit 131 by controlling the clock module 120. The first signal processing unit 131 is used for processing the first electrical signal, so that the processed first electrical signal is more matched with the driving transduction of the first transducer 132. The first signal processing unit 131 is connected to the first transducer 132, and the first signal processing unit 131 transmits the processed first electrical signal to the first transducer 132. The first transducer 132 can convert the first electrical signal processed by the first signal processing unit 131 into an acoustic signal, and since the first electrical signal processed by the first signal processing unit 131 is more matched with the driving transduction of the first transducer 132, the conversion rate of the first transducer 132 for converting the first electrical signal processed by the first signal processing unit into the acoustic signal is higher, thereby improving the quality of the acoustic signal transmitted by the first transducer 132.
Fig. 4 is a schematic structural diagram of another bidirectional doppler velocimeter according to an embodiment of the present invention. As shown in fig. 4, the first signal processing unit includes a driving subunit 1311, a resonating subunit 1312, and a transforming subunit 1313; the control module 110 and the clock module 120 are connected with the driving subunit 1311, the driving subunit 1311 is connected with the resonator subunit 1312, the resonator subunit 1312 is connected with the transforming subunit 1313, and the transforming subunit 1313 is connected with the first transducer 132; the driving subunit 1311 is configured to amplify the first electrical signal, the resonance subunit 1312 is configured to convert the first electrical signal into a resonance signal, the transforming subunit 1313 is configured to adjust the resonance signal, and the first transducer 132 is configured to convert the resonance signal adjusted by the transforming subunit 1313 into an acoustic wave signal.
The first signal processing unit sequentially processes the first electrical signal received by the first signal processing unit through the driving subunit 1311, the resonator subunit 1312 and the transforming subunit 1313. Specifically, the control module 110 and the clock module 120 are connected to the driving subunit 1311, the control module 110 controls the clock module 120 to provide the first electrical signal to the driving subunit 1311, and the driving subunit 1311 amplifies the transmitted first electrical signal. The driving subunit 1311 is connected to the resonator subunit 1312, and the driving subunit 1311 transmits the amplified first electrical signal to the resonator subunit 1312, and the amplified first electrical signal resonates via the resonator subunit 1312 and is converted into a resonant signal. The resonance subunit 1312 is connected with the transformer subunit 1313, the resonance subunit 1312 transmits the resonance signal to the transformer subunit 1313, and the transformer subunit 1313 adjusts the resonance signal so that the adjusted resonance signal matches the driving transduction of the first transducer 132. The transformer sub-unit 1313 is connected to the first transducer 132, the first transducer 132 converts the resonance signal adjusted by the transformer sub-unit 1313 into an acoustic signal, and since the resonance signal processed by the transformer sub-unit 1313 more matches with the driving transduction of the first transducer 132, the conversion rate of the resonance signal processed by the transformer sub-unit 1313 into the acoustic signal by the first transducer 132 is higher, thereby improving the quality of the acoustic signal transmitted by the first transducer 132.
Optionally, the first transducer comprises an ultrasound transmitting probe; the ultrasonic emission probe is connected with the voltage transformation subunit and is used for converting the resonance signal regulated by the voltage transformation subunit into a sound wave signal.
The first transducer comprises an ultrasonic transmitting probe, the ultrasonic transmitting probe is a transducer for realizing the conversion between electric energy and sound energy, and the ultrasonic transmitting probe is used for converting the electric energy into the sound energy and transmitting a sound wave signal outwards. The ultrasonic emission probe is connected with the voltage transformation subunit and is used for converting the resonance signal regulated by the voltage transformation subunit into a sound wave signal.
Fig. 5 is a schematic structural diagram of another bidirectional doppler velocimeter according to an embodiment of the present invention. As shown in fig. 5, the receiving module 140 includes a second signal processing unit 141 and a second transducer 142; the second transducer 142, the control module 110 and the clock module 120 are connected with the second signal processing unit 141; the second transducer 142 is used for receiving the reflected wave signal and converting the reflected wave signal into a second electrical signal; the second signal processing unit 141 is configured to receive the zero-mixing signal provided by the clock module 120, and process the second electrical signal according to the zero-mixing signal and transmit the second electrical signal to the control module 110.
The receiving module 140 mainly includes a second signal processing unit 141 and a second transducer 142. Specifically, the second transducer 142 is connected to the second signal processing unit 141, and after receiving the reflected acoustic wave signal, the second transducer 142 converts the reflected acoustic wave signal into a second electrical signal and transmits the second electrical signal to the second signal processing unit 141. The clock module 120 is connected to the second signal processing unit 141, and the clock signal transmits the generated zero-mixing signal to the second signal processing unit 141. The second signal processing unit 141 performs zero mixing processing on the second electrical signal by using the zero mixing signal, and filters out the mixing signal included in the second electrical signal to implement zero mixing of the second electrical signal, that is, to obtain the second electrical signal only containing the water flow velocity information. The control module 110 is connected to the second signal processing unit 141, and the second signal processing unit 141 transmits the second electrical signal only containing the water flow velocity information to the control module 110, so that the data obtained by the control module 110 is more accurate, and the control module 110 calculates the accuracy of the water flow velocity corresponding to the second electrical signal processed by the two second signal processing units 141.
Fig. 6 is a schematic structural diagram of another bidirectional doppler velocimeter according to an embodiment of the present invention. As shown in fig. 6, the second signal processing unit 141 includes an amplifying sub-unit 1411, a mixing sub-unit 1412 and a filtering sub-unit 1413; the second transducer 142 is connected to the amplifying sub-unit 1411, the amplifying sub-unit 1411 is connected to the mixing sub-unit 1412, the mixing sub-unit 1412 is connected to the filtering sub-unit 1413 and the clock module 120, and the filtering sub-unit 1413 is connected to the control module 110; the amplifying sub-unit 1411 is configured to amplify the second electrical signal, the mixing sub-unit 1412 is configured to modulate the amplified second electrical signal to generate a modulated signal, and the filtering sub-unit 1413 is configured to filter a noise signal in the modulated signal.
The second signal processing unit 141 sequentially processes the second electrical signal converted by the second transducer 142 through the amplifying subunit 1411, the mixing subunit 1412 and the filtering subunit 1413. Specifically, the second transducer 142 is connected to the amplification sub-unit 1411, the second transducer transmits the second electrical signal to the amplification sub-unit 1411, and the amplification sub-unit 1411 amplifies the second electrical signal. The amplifying sub-unit 1411 is connected to the mixing sub-unit 1412, and the amplifying sub-unit 1411 transmits the amplified second electrical signal to the mixing sub-unit 1412. The mixing sub-unit 1412 is connected to the clock module 120, and the clock module 120 transmits the zero-mixing signal to the mixing sub-unit 1412. The frequency mixing subunit 1412 modulates the amplified second electrical signal with the zero frequency mixing signal, and filters the frequency mixing signal included in the second electrical signal to generate a modulated signal. The frequency mixing subunit 1412 is connected to the filtering subunit 1413, and the frequency mixing subunit 1412 transmits the modulated signal to the filtering subunit 1413 for filtering, so as to filter out the noise signal in the modulated signal and reduce the interference and influence of the noise signal in the modulated signal on the effective signal. The filtering subunit 1413 is connected to the control module 110, and the filtering subunit 1413 transmits the modulation signal for filtering the noise signal to the control module 110, so that the data acquired by the control module 110 is more accurate.
Optionally, the second transducer comprises an ultrasound receiving probe; the ultrasonic receiving probe is connected with the amplifying unit and used for receiving the sound wave signal transmitted by the transmitting module and converting the sound wave signal into a second electric signal.
The second transducer comprises an ultrasonic receiving probe, the ultrasonic receiving probe is a transducer for converting electric energy and sound energy, the ultrasonic receiving probe is used for receiving sound wave signals transmitted by the transmitting module, the ultrasonic receiving probe converts reflected wave signals into second electric signals after receiving the reflected sound wave signals, and transmits the second electric signals to the amplifying unit connected with the ultrasonic receiving probe.
Fig. 7 is a schematic structural diagram of another bidirectional doppler velocimeter according to an embodiment of the present invention. As shown in fig. 7, the bidirectional doppler velocimeter further comprises a storage module 150; the storage module 150 is connected to the control module 110, and the storage module 150 is configured to store the second electrical signals collected by the control module 110 and processed by the two receiving modules 140.
The two-way doppler velocimeter further includes a storage module 150, the storage module 150 is connected to the control module 110, the control module 110 can collect the second electrical signals processed by the two receiving modules 140 within a period of time and at a certain frequency, and the second electrical signals collected by the control module 110 and processed by the two receiving modules 140 are stored in the storage module 150.
Fig. 8 is a schematic flow chart of a bidirectional doppler velocity measurement method according to an embodiment of the present invention, where the bidirectional doppler velocity measurement method specifically includes the following steps:
s201, the control module controls the clock module to provide a first electric signal for the transmitting module;
s202, the transmitting module transmits a sound wave signal according to the first electric signal;
s203, the receiving module receives a reflected wave signal generated after the sound wave signal is reflected, and generates a second electric signal according to the reflected wave signal;
s204, the clock module provides a zero mixing signal for the receiving module;
s205, the receiving module processes the second electric signal according to the zero mixing signal;
s206, the control module collects the second electric signals processed by the two receiving modules, and determines the water flow direction and the water flow speed according to the second electric signals processed by the two receiving modules.
In conclusion, the scheme controls the transmitting module to transmit the sound wave signal to the water through the control module and the clock module, utilizes the characteristic that the sound wave signal can be reflected by fine particles such as plankton in the water to generate a reflected wave signal, receives the reflected wave signal through the receiving module and converts the reflected wave signal into a second electric signal. In addition, the receiving module can filter the mixing signal contained in the second electrical signal by using the zero mixing signal provided by the clock signal, so as to realize zero mixing of the second electrical signal, that is, obtain the second electrical signal only containing the water flow velocity information. The second electric signal which only contains the water flow velocity information is transmitted to the control module, so that the data acquired by the control module are more accurate, and the control module calculates the accuracy of the water flow velocity corresponding to the second electric signal processed by the two receiving modules to be higher. In addition, the control module compares the flow rates of the water flows corresponding to the second electric signals processed by the two receiving modules, and the accuracy of the determined water flow direction is higher.
Fig. 9 is a schematic flow chart of another bidirectional doppler velocity measurement method according to an embodiment of the present invention. The driving subunit, the harmonic oscillator subunit, the voltage transformation subunit, the first transducer, the filtering subunit, the frequency mixing subunit, the amplifying subunit and the second transducer are all two, one group of driving subunit, one group of harmonic oscillator subunit, one group of voltage transformation subunit, one group of first transducer, one group of filtering subunit, one group of frequency mixing subunit, one group of amplifying subunit and one group of second transducer are used for measuring the flow velocity of water flow in the water-facing direction, and the other two groups of driving subunit, one group of harmonic oscillator subunit, one group of voltage transformation subunit, one group of first transducer, one group of filtering subunit, one group of frequency mixing subunit, one group of amplifying subunit and one group of second transducer are used for measuring the flow velocity of water flow in the water-backing direction. The method for measuring the speed of the Doppler specifically comprises the following steps:
s301, the control module controls the clock module to provide a first electric signal for the driving subunit;
s302, driving the subunit to amplify the first electric signal;
s303, converting the amplified first electric signal into a resonance signal by the harmonic oscillator unit;
s304, the voltage transformation subunit adjusts the resonance signal;
s305, converting the resonance signal regulated by the transformer subunit into a sound wave signal by the first transducer;
s306, the second transducer is used for receiving the reflected wave signal and converting the reflected wave signal into a second electric signal;
s307, the amplifying subunit is used for amplifying the second electric signal;
s308, the frequency mixing subunit is used for modulating the amplified second electric signal to generate a modulation signal;
s309, the filtering subunit is used for filtering noise signals in the modulation signals;
s310, the control module collects the modulated signals filtered by the two filtering subunits at a certain frequency in unit time, and respectively calculates the water flow velocity corresponding to the modulated signals filtered by the two filtering subunits according to the filtered modulated signals collected in unit time;
s311, the control module determines the water flow speed and the water flow direction according to the water flow speed corresponding to the modulation signal filtered by the two filtering subunits.
The bidirectional doppler velocity measurement method provided in the above embodiment is executed by the bidirectional doppler velocity measurement instrument provided in any embodiment of the present invention, and therefore has the beneficial effects of the bidirectional doppler velocity measurement instrument provided in the embodiment of the present invention, and details thereof are not repeated herein.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A bidirectional Doppler velocimeter is characterized by comprising a control module, a clock module, two transmitting modules and two receiving modules, wherein the transmitting modules, the receiving modules and the clock module are connected with the control module, and the transmitting modules and the receiving modules are connected with the clock module; the control module is used for controlling the clock module to provide a first electric signal for the transmitting module, and the transmitting module transmits a sound wave signal according to the first electric signal; the receiving module is used for receiving a reflected wave signal generated after the sound wave signal is reflected and generating a second electric signal according to the reflected wave signal; the clock module is used for providing a zero mixing signal for the receiving module; the receiving module is further configured to process the second electrical signal according to the zero mixing signal; the control module is further used for collecting the second electric signals processed by the two receiving modules and determining the water flow direction and the water flow speed according to the second electric signals processed by the two receiving modules.
2. The two-way doppler velocimeter of claim 1, wherein one said transmitting module and one said receiving module form a set of transmit-receive groups;
the transmitting and receiving groups are arranged on the water-facing side of the bidirectional Doppler velocimeter and are used for measuring the flow velocity of water flow in the water-facing direction; and the other group of the transmitting and receiving groups are arranged on the backwater side of the bidirectional Doppler velocimeter and are used for measuring the flow velocity of water flow in the backwater direction.
3. The two-way doppler velocimeter of claim 1, wherein the transmitting module comprises a first signal processing unit and a first transducer;
the control module and the clock module are connected with the first signal processing unit, and the control module is used for controlling the clock module to provide a first electric signal for the first signal processing unit; the first signal processing unit is connected with the first transducer and used for processing the first electric signal and transmitting the first electric signal to the first transducer; the first transducer is used for converting the first electric signal processed by the first electric signal processing unit into an acoustic wave signal.
4. The bidirectional doppler velocimeter of claim 3, wherein the first signal processing unit comprises a driving subunit, a resonating subunit, and a transforming subunit;
the control module and the clock module are connected with the driving subunit, the driving subunit is connected with the harmonic oscillator unit, the harmonic oscillator unit is connected with the voltage transformation subunit, and the voltage transformation subunit is connected with the first energy converter; the driving subunit is used for amplifying the first electric signal, the resonance subunit is used for converting the first electric signal into a resonance signal, the voltage transformation subunit is used for adjusting the resonance signal, and the first transducer is used for converting the resonance signal adjusted by the voltage transformation subunit into a sound wave signal.
5. The two-way doppler velocimeter of claim 4, wherein the first transducer comprises an ultrasound transmission probe;
the ultrasonic transmitting probe is connected with the voltage transformation subunit, and the ultrasonic transmitting probe is used for converting the resonance signal regulated by the voltage transformation subunit into a sound wave signal.
6. The bidirectional doppler velocimeter of claim 1, wherein the receiving module comprises a second signal processing unit and a second transducer;
the second transducer, the control module and the clock module are connected with the second signal processing unit; the second transducer is used for receiving the reflected wave signal and converting the reflected wave signal into a second electric signal; the second signal processing unit is used for receiving the zero mixing signal provided by the clock module, processing the second electric signal according to the zero mixing signal and transmitting the second electric signal to the control module.
7. The bidirectional doppler velocimeter of claim 6, wherein the second signal processing unit comprises an amplifying sub-unit, a mixing sub-unit and a filtering sub-unit;
the second transducer is connected with the amplifying subunit, the amplifying subunit is connected with the frequency mixing subunit, the frequency mixing subunit is connected with the filtering subunit and the clock module, and the filtering subunit is connected with the control module; the amplifying subunit is configured to amplify the second electrical signal, the mixing subunit is configured to modulate the amplified second electrical signal to generate a modulated signal, and the filtering subunit is configured to filter a noise signal in the modulated signal.
8. The bidirectional doppler velocimeter of claim 7, wherein the second transducer comprises an ultrasound receiving probe;
the ultrasonic receiving probe is connected with the amplifying unit and used for receiving the sound wave signal transmitted by the transmitting module and converting the sound wave signal into the second electric signal.
9. The bidirectional doppler velocimeter of claim 1, further comprising a memory module;
the storage module is connected with the control module and used for storing the second electric signals collected by the control module and processed by the two receiving modules.
10. A bidirectional Doppler velocity measurement method is characterized by comprising the following steps:
the control module controls the clock module to provide a first electric signal for the transmitting module;
the transmitting module transmits a sound wave signal according to the first electric signal;
the receiving module receives a reflected wave signal generated after the sound wave signal is reflected, and generates a second electric signal according to the reflected wave signal;
the clock module provides a zero mixing signal for the receiving module;
the receiving module processes the second electrical signal according to the zero mixing signal;
the control module collects the second electric signals processed by the two receiving modules, and determines the water flow direction and the water flow speed according to the second electric signals processed by the two receiving modules.
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