A flow velocity detection method and device

Abstract

The present invention provides a flow velocity detection method and device, comprising: obtaining at least two sets of ultrasonic signal transmission frequencies and corresponding ultrasonic echo signal receiving frequencies, each set of ultrasonic echo signals corresponding to a set of ultrasonic signals, the ultrasonic signals propagating in a fluid to be measured; obtaining a propagation velocity relationship function of the ultrasonic signals in the fluid to be measured, the propagation velocity relationship function being a relationship function between the propagation velocity of the ultrasonic signal in the fluid to be measured and the transmission frequency of the ultrasonic signal; and determining the flow velocity of the fluid to be measured based on the at least two sets of transmission frequencies, their corresponding two sets of receiving frequencies, and the propagation velocity relationship function. The present invention fully accounts for the influence of dispersion effects, thereby improving the accuracy of detecting the flow velocity of the fluid to be measured.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic detection, and in particular to a flow velocity detection method and device. Background Art

[0002] Ultrasonic detection technology is widely used in industrial liquid and gas flow measurement or velocity measurement. Its basic principle is to place an ultrasonic transducer at a non-perpendicular angle to the pipe wall of the fluid and transmit an ultrasonic signal in real time. The ultrasonic signal encounters scattered particles in the fluid, generating an echo signal that is received by the ultrasonic transducer's receiver. Because the fluid flows at a certain speed, the received scattered echo signal is affected by the Doppler effect, resulting in a frequency shift. By calculating this frequency shift, the fluid's flow velocity can be determined.

[0003] In actual flow velocity detection, fluid solution compositions vary widely, and different solution compositions attenuate ultrasonic signals to varying degrees. When ultrasonic waves propagate through viscous fluids, they experience a dispersion effect, meaning that the propagation speeds of ultrasonic waves of different frequencies in the same medium vary. Traditional ultrasonic Doppler detection methods often fail to account for this dispersion effect and instead use a fixed ultrasonic propagation velocity to calculate fluid velocity. This results in inaccurate measured fluid velocity and an error between the measured velocity and the actual fluid velocity. Summary of the Invention

[0004] Therefore, the present invention aims to solve the technical problem in the prior art that the fluid flow velocity determined by fixing the ultrasonic wave propagation velocity in the traditional ultrasonic Doppler technology is inaccurate, thereby providing a flow velocity detection method and device.

[0005] According to a first aspect, an embodiment of the present invention provides a flow velocity detection method, comprising the following steps:

[0006] Obtaining the transmission frequencies of at least two groups of ultrasonic signals and the receiving frequencies of their ultrasonic echo signals, each group of ultrasonic echo signals corresponding to a group of ultrasonic signals, the ultrasonic signals propagating in the fluid to be measured;

[0007] Acquire a propagation velocity relationship function of the ultrasonic signal in the fluid to be measured, where the propagation velocity relationship function is a relationship function between the propagation velocity of the ultrasonic signal in the fluid to be measured and the emission frequency of the ultrasonic signal;

[0008] The flow velocity of the fluid to be measured is determined based on at least two groups of transmitting frequencies and their corresponding two groups of receiving frequencies and the propagation velocity relationship function.

[0009] Optionally, the propagation speed relationship function is:

[0010]

[0011] Wherein, K is a coefficient, ρ is the density of the fluid to be measured, ω=2πf, ω is the angular frequency of the ultrasonic signal, f is the transmission frequency, and c is the propagation speed of the ultrasonic signal in the fluid to be measured.

[0012] Optionally, the at least two groups of ultrasonic signals and their corresponding ultrasonic echo signals are obtained by transmitting and receiving a group of ultrasonic transducers.

[0013] Optionally, the transmitting end in the group of ultrasonic transducers transmits the ultrasonic signal through the following steps:

[0014] Determine a first signal source and a second signal source, wherein the first signal source is used for the transmitting end to transmit a first transmitting frequency, and the second signal source is used for the transmitting end to transmit a second transmitting frequency, and the first transmitting frequency is different from the second transmitting frequency;

[0015] The transmitting end is controlled to switch between the first signal source and the second signal source.

[0016] Optionally, the transmitting end of the ultrasonic transducer is arranged on one side of the lumen axis for transmitting the fluid to be measured, and the transmitting direction of the ultrasonic signal forms a preset angle with the lumen axis.

[0017] Optionally, determining the flow velocity of the fluid to be measured based on at least two groups of transmission frequencies and their corresponding two groups of receiving frequencies and the propagation velocity relationship function includes:

[0018] Establishing a first relationship function using the first group of transmitting frequencies, the first group of receiving frequencies, and the propagation speed relationship function;

[0019] Establishing a second relationship function using the second group of transmitting frequencies, the second group of receiving frequencies, and the propagation speed relationship function;

[0020] The first relationship function and the second relationship function are combined to calculate the actual flow rate of the fluid to be measured.

[0021] Optionally, the first relationship function or the second relationship function is:

[0022]

[0023] in, is the propagation velocity relationship function, ω=2πf, ω is the angular frequency of the ultrasonic signal, f' is the receiving frequency, f is the transmitting frequency, K is the coefficient, ρ is the density of the fluid to be measured, c is the propagation velocity of the ultrasonic signal in the fluid to be measured, θ is the angle between the ultrasonic signal emission direction and the axial direction of the lumen, and V is the flow velocity of the fluid to be measured.

[0024] According to a second aspect, an embodiment of the present invention provides a flow velocity detection device, comprising:

[0025] an acquisition module, configured to acquire the transmission frequencies of at least two groups of ultrasonic signals and the receiving frequencies of their ultrasonic echo signals, wherein each group of ultrasonic echo signals corresponds to a group of ultrasonic signals, and the ultrasonic signals propagate in the fluid to be measured;

[0026] a calling module, configured to obtain a propagation velocity relationship function of the ultrasonic signal in the fluid to be measured, wherein the propagation velocity relationship function is a relationship function between the propagation velocity of the ultrasonic signal in the fluid to be measured and the emission frequency of the ultrasonic signal;

[0027] The determination module is configured to determine the flow velocity of the fluid to be measured based on at least two groups of transmission frequencies and their corresponding two groups of receiving frequencies and the propagation velocity relationship function.

[0028] According to the third aspect, an embodiment of the present invention provides a computer device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the above-mentioned flow rate detection method by executing the computer instructions.

[0029] According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the above-mentioned flow rate detection method.

[0030] The technical solution of the present invention has the following advantages:

[0031] In this embodiment of the present invention, first, it is necessary to obtain at least two sets of ultrasonic signal transmission frequencies and the corresponding ultrasonic echo signal reception frequencies; second, determine a function relating the propagation velocity of the ultrasonic signal in the fluid being measured; and finally, determine the flow velocity of the fluid being measured using the at least two sets of transmission frequencies, their corresponding two sets of reception frequencies, and the propagation velocity relationship function. This embodiment fully considers the impact of frequency dispersion effects and establishes a relationship between the propagation velocity of the ultrasonic signal in the fluid being measured and the transmission frequency of the ultrasonic signal. This eliminates the need to use the ultrasonic signal propagation velocity in the fluid being measured as a constant in calculations, thereby improving the accuracy of detecting the flow velocity of the fluid being measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a flow chart of a specific example of a flow rate detection method in Example 1 of the present application;

[0034] Figure 2 A location diagram of a specific example of the configuration of the transmitting end and the receiving end in Example 1 of the present application;

[0035] Figure 3 A location diagram of another specific example of the configuration of the transmitting end and the receiving end in Example 1 of the present application;

[0036] Figure 4 A location diagram of another specific example of the configuration of the transmitting end and the receiving end in Example 1 of the present application;

[0037] Figure 5 This is a schematic diagram of a specific example of frequency shift keying frequency modulation in Example 1 of the present application;

[0038] Figure 6 This is a waveform diagram of a specific example of transmission frequency superposition in Example 1 of the present application;

[0039] Figure 7 This is a principle block diagram of a specific example of a flow velocity detection device in Example 2 of the present application;

[0040] Figure 8 This is a structural diagram of a specific example of a computer device in Example 3 of the present application. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components; wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Example 1

[0046] This embodiment provides a flow rate detection method, which can be executed by a server or other device, by obtaining data such as the transmission frequency and the reception frequency through the server or other device, and using the server or other device to determine the relationship function and calculate the actual flow rate of the fluid to be measured, thereby realizing the flow rate detection. Figure 1 As shown, the following steps are included:

[0047] Step S101 , obtaining the transmitting frequencies of at least two groups of ultrasonic signals and the receiving frequencies of their ultrasonic echo signals, wherein each group of ultrasonic echo signals corresponds to a group of ultrasonic signals, and the ultrasonic signals propagate in the fluid to be measured.

[0048] At least two groups of ultrasonic signals can be transmitted by one group of ultrasonic transducers, or by more than two groups of ultrasonic transducers, each group of ultrasonic transducers can include a transmitting end and a receiving end. The ultrasonic signal is emitted by the transmitting end, and the ultrasonic echo signal can be received by the corresponding receiving end. Each group of ultrasonic signals corresponds to a set of transmitting frequencies, and each group of ultrasonic echo signals corresponds to a set of receiving frequencies, wherein the transmitting frequency corresponding to the ultrasonic signal and the receiving frequency corresponding to the ultrasonic echo signal can be the number of times the signal changes periodically per unit time. The ultrasonic signal propagates in the fluid to be measured, encounters scatterers in the fluid, generates an ultrasonic echo signal, and is received by the receiving end of the ultrasonic transducer. Since the fluid flows at a certain speed, the received ultrasonic echo signal will be affected by the Doppler effect and produce a frequency shift, resulting in a difference between the receiving frequency and the transmitting frequency. In this embodiment, it is necessary to obtain the transmitting frequency of at least two groups of ultrasonic signals and the receiving frequency of the ultrasonic echo signal corresponding to the ultrasonic signal.

[0049] Step S102 : obtaining a propagation velocity relationship function of the ultrasonic signal in the fluid to be measured, wherein the propagation velocity relationship function is a relationship function between the propagation velocity of the ultrasonic signal in the fluid to be measured and the emission frequency of the ultrasonic signal.

[0050] In the prior art, when calculating the flow velocity of a measured fluid using the transmission and reception frequencies of ultrasonic signals, the propagation velocity of the ultrasonic signal in the fluid is often used as a constant. For example, the average propagation velocity of ultrasonic signals in human tissue is 1540 m / s. When measuring the blood flow velocity of a human, 1540 m / s is used as the propagation velocity of the ultrasonic signal in blood. This constant is then substituted into the relationship function used to calculate the flow velocity of the measured fluid, thereby calculating the flow velocity of the measured fluid. However, this method of using the propagation velocity of the ultrasonic signal in the fluid as a constant for calculating the flow velocity of the measured fluid does not account for the influence of the dispersion effect, resulting in inaccurate detected flow velocity of the measured fluid. Therefore, in this embodiment, the method of using the propagation velocity of the ultrasonic signal in the fluid as a constant for calculating the flow velocity of the measured fluid is no longer used.

[0051] In this embodiment, a propagation velocity relationship function is established based on the relationship between ultrasonic signal attenuation and dispersion. Specifically, this propagation velocity relationship function can be established based on the Kramers-Kronig equation to obtain a relationship function between the propagation velocity of the ultrasonic signal in the measured fluid and the transmission frequency of the ultrasonic signal. The propagation velocity relationship function is described below. Establishing a relationship between the propagation velocity of the ultrasonic signal in the measured fluid and the transmission frequency of the ultrasonic signal fully accounts for the influence of dispersion effects, eliminating the need to use the ultrasonic signal propagation velocity in the fluid as a constant in calculations, thereby improving the accuracy of measuring the flow rate of the measured fluid.

[0052] Step S103 : determining the flow velocity of the fluid to be measured based on at least two groups of transmitting frequencies and their corresponding two groups of receiving frequencies and the propagation velocity relationship function.

[0053] As described above, since the fluid flows at a certain speed, the received ultrasonic echo signal will be affected by the Doppler effect and produce a frequency shift, resulting in a difference between the receiving frequency and the transmitting frequency. This embodiment is based on this principle and combined with the propagation velocity relationship function to determine the flow velocity of the fluid to be measured.

[0054] In this embodiment, first, it is necessary to obtain at least two sets of ultrasonic signal transmission frequencies and the corresponding ultrasonic echo signal reception frequencies; second, determine a function that relates the ultrasonic signal's propagation velocity in the fluid being measured; and finally, determine the flow velocity of the fluid being measured using the at least two sets of transmission frequencies, their corresponding two sets of reception frequencies, and the propagation velocity relationship function. This embodiment fully considers the impact of frequency dispersion effects and establishes a relationship between the ultrasonic signal's propagation velocity in the fluid being measured and the ultrasonic signal's transmission frequency, eliminating the need to use the ultrasonic signal's propagation velocity in the fluid as a constant in calculations. This improves the accuracy of detecting the flow velocity of the fluid being measured.

[0055] As an optional implementation manner, in an embodiment of the present invention, the propagation speed relationship function is:

[0056]

[0057] Wherein, K is a coefficient, ρ is the density of the fluid to be measured, ω=2πf, ω is the angular frequency of the ultrasonic signal, f is the transmission frequency, and c is the propagation speed of the ultrasonic signal in the fluid to be measured.

[0058] In the propagation velocity relationship function, the propagation velocity of the ultrasonic signal in the fluid to be measured is related to the density of the fluid to be measured and is proportional to the emission frequency of the ultrasonic signal.

[0059] When the transmission frequencies of two sets of ultrasonic signals and the receiving frequencies of their ultrasonic echo signals are obtained, assuming that the transmission frequency of the first set of ultrasonic signals is f1 and the transmission frequency of the second set of ultrasonic signals is f2, the propagation speed of the ultrasonic signal at the current transmission frequency f1 in the fluid to be measured is The propagation speed of the ultrasonic signal at the current transmission frequency f2 in the fluid to be measured is

[0060] The flow state and viscosity state of the fluid to be measured are often changing. The premise for the establishment of the propagation velocity relationship function is that the parameters of the fluid to be measured remain unchanged within a certain period of time.

[0061] As an optional embodiment, in an embodiment of the present invention, the at least two groups of ultrasonic signals and their corresponding ultrasonic echo signals are obtained by transmitting and receiving a group of ultrasonic transducers. As mentioned above, the at least two groups of ultrasonic signals can be transmitted by a group of ultrasonic transducers, or by more than two groups of ultrasonic transducers, and each group of ultrasonic transducers can include a transmitting end and a receiving end. The positions of the transmitting end and the receiving end of a group of ultrasonic transducers are arranged as follows: Figure 2 Or 3 or 4.

[0062] As mentioned above, the flow and viscosity of the fluid under test often vary, necessitating the transmission of two ultrasonic signals of different frequencies within the shortest possible timeframe. While two sets of ultrasonic transducers can be used for simultaneous transmission and reception, sampling results can be affected by individual transducer variations, thereby impacting the flow velocity of the fluid under test. Therefore, in this embodiment, a single ultrasonic transducer is preferred for both transmission and reception.

[0063] As an optional implementation manner, in an embodiment of the present invention, the transmitting end in the group of ultrasonic transducers transmits the ultrasonic signal through the following steps:

[0064] Determine a first signal source and a second signal source, wherein the first signal source is used for the transmitting end to transmit a first transmitting frequency, and the second signal source is used for the transmitting end to transmit a second transmitting frequency, and the first transmitting frequency is different from the second transmitting frequency;

[0065] The transmitting end is controlled to switch between the first signal source and the second signal source.

[0066] In this embodiment, a frequency shift keying frequency modulation signal FSK (Frequency shift keying frequency modulation signal abbreviated as FSK) can be used as the frequency modulation signal excitation method. Figure 5 As shown. The oscillation frequency of the signal source can be determined according to the required transmission frequency, that is, the first transmission frequency can be output by the first signal source, and the second transmission frequency can be output by the second signal source. In this embodiment, the fundamental wave and the higher harmonic frequency of the ultrasonic transducer can be used as the first signal source and the second signal source respectively to realize dual-frequency excitation of the fundamental wave and the harmonic wave; so that the excitation signal is the superposition of two groups of ultrasonic signals with different transmission frequencies, and the ultrasonic echo signal received by the receiving end is also the superposition of the two groups of receiving frequencies. The superposition of two groups of ultrasonic signals with different transmission frequencies is shown in FIG. Figure 6 In this embodiment, a server or other device can be used to control the ultrasonic transducer transmitting end to switch between the first signal source and the second signal source by controlling a switching switch, so as to transmit the ultrasonic signals of different transmitting frequencies.

[0067] Specifically, if Figure 5 As shown, for example, when the conversion switch is in contact with the output terminal of the first signal source, it is at a high level of 1, and when the conversion switch is in contact with the output terminal of the second signal source, it is at a low level of 0. During the high-level period, the first signal source can be used to output a first transmission frequency, causing the ultrasonic transducer transmitter to transmit an ultrasonic signal at the first transmission frequency. During the low-level period, the second signal source can be used to output a second transmission frequency, causing the ultrasonic transducer transmitter to transmit an ultrasonic signal at the second transmission frequency. The control switch is controlled to alternately conduct during the high-level and low-level periods to output a superposition of two sets of ultrasonic signals with different transmission frequencies, and the high-level conduction time is the same as the low-level conduction time. Similarly, the ultrasonic transducer receiver receives the ultrasonic echo signal, which is filtered, averaged, and processed to obtain the superposition of the two sets of ultrasonic echo signal receiving frequencies.

[0068] like Figure 6 The excitation signal shown is composed of two sets of signals with different transmission frequencies that change alternately in time. Compared with the traditional single transmission frequency method, the detection method in this embodiment can obtain two sets of ultrasonic signals and corresponding ultrasonic echo signals, which are Doppler signals based on high frequency and low frequency respectively. By processing the two Doppler signals, not only can the number of scatterers in different motion states of the fluid to be measured be depicted, but the single Doppler signal can also be corrected, thereby more accurately determining the flow velocity of the fluid to be measured.

[0069] As an optional implementation, in an embodiment of the present invention, the transmitting end of the ultrasonic transducer is arranged on one side of the lumen axis for transmitting the fluid to be measured and the transmitting direction of the ultrasonic signal forms a preset angle with the lumen axis.

[0070] like Figure 2-4 As shown in any of the figures, the transmitting end of the ultrasonic transducer is positioned on one side of the lumen axis, while the receiving end can be positioned symmetrically along the lumen axis, or on the same side as the transmitting end. During assembly, the ultrasonic signal transmission direction must form a predetermined angle θ with the lumen axis. In actual applications, the flow direction of the fluid to be measured is often assumed to be aligned with the lumen axis. In this case, the ultrasonic signal transmission direction also forms a predetermined angle θ with the flow direction of the fluid to be measured.

[0071] As an optional implementation manner, in an embodiment of the present invention, determining the flow velocity of the fluid to be measured based on at least two groups of transmission frequencies and their corresponding two groups of receiving frequencies and the propagation velocity relationship function includes:

[0072] Establishing a first relationship function using the first group of transmitting frequencies, the first group of receiving frequencies, and the propagation speed relationship function;

[0073] Establishing a second relationship function using the second group of transmitting frequencies, the second group of receiving frequencies, and the propagation speed relationship function;

[0074] The first relationship function and the second relationship function are combined to calculate the actual flow rate of the fluid to be measured.

[0075] As an optional implementation manner, in an embodiment of the present invention, the first relationship function or the second relationship function is:

[0076]

[0077] in, is the propagation velocity relationship function, ω=2πf, ω is the angular frequency of the ultrasonic signal, f' is the receiving frequency, f is the transmitting frequency, K is the coefficient, ρ is the density of the fluid to be measured, c is the propagation velocity of the ultrasonic signal in the fluid to be measured, θ is the angle between the ultrasonic signal emission direction and the axial direction of the lumen, and V is the flow velocity of the fluid to be measured.

[0078] For example: the first group of transmitting frequencies is f1, the first group of receiving frequencies is f'1, the second group of transmitting frequencies is f2, the second group of receiving frequencies is f'2; then Then the first relation function is Then the second relation function is By combining the first relationship function and the second relationship function, the flow rate of the fluid to be measured can be calculated.

[0079] In existing techniques, the propagation velocity c of ultrasonic signals in the fluid is often treated as a constant. This means that the flow velocity of the fluid under test can be calculated simply by obtaining a set of transmit frequencies and corresponding receive frequencies. However, this method of calculating the flow velocity of the fluid under test using the propagation velocity of ultrasonic signals as a constant fails to account for the influence of frequency dispersion, resulting in inaccurate flow velocity calculations.

[0080] Example 2

[0081] This embodiment provides a flow rate detection device, which can be used to execute the flow rate detection method in the above embodiment 1. The device can be set inside a server or other equipment, and the modules cooperate with each other to achieve flow rate detection. Figure 7 As shown, the device includes:

[0082] An acquisition module 201 is configured to acquire the transmission frequencies of at least two groups of ultrasonic signals and the receiving frequencies of their ultrasonic echo signals, wherein each group of ultrasonic echo signals corresponds to a group of ultrasonic signals propagating in the fluid to be measured;

[0083] The retrieving module 202 is configured to obtain a propagation velocity relationship function of the ultrasonic signal in the fluid to be measured, wherein the propagation velocity relationship function is a relationship function between the propagation velocity of the ultrasonic signal in the fluid to be measured and the transmission frequency of the ultrasonic signal;

[0084] The determination module 203 is configured to determine the flow velocity of the fluid to be measured based on at least two groups of transmission frequencies and their corresponding two groups of receiving frequencies and the propagation velocity relationship function.

[0085] In this embodiment, the influence of the dispersion effect is fully taken into account, and a relationship is established between the propagation speed of the ultrasonic signal in the fluid to be measured and the emission frequency of the ultrasonic signal. The propagation speed of the ultrasonic signal in the fluid is no longer calculated as a constant, thereby improving the accuracy of detecting the flow rate of the fluid to be measured.

[0086] For a detailed description of the above-mentioned device part, please refer to the above-mentioned method embodiment, which will not be repeated here.

[0087] Example 3

[0088] This embodiment provides a computer device, such as Figure 8 As shown, the computer device includes a processor 301 and a memory 302, wherein the processor 301 and the memory 302 can be connected via a bus or other means. Figure 8 The bus connection is taken as an example.

[0089] The processor 301 may be a central processing unit (CPU). The processor 301 may also be other general-purpose processors, digital signal processors (DSP), graphics processing units (GPU), embedded neural network processors (NPU), or other dedicated deep learning coprocessors, application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0090] Memory 302, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the flow velocity detection method according to the embodiments of the present invention and the corresponding program instructions / modules. Processor 301 executes the non-transitory software programs, instructions, and modules stored in memory 302 to perform various processor functions and data processing, thereby implementing the flow velocity detection method according to the aforementioned method embodiment.

[0091] The memory 302 may also include a program storage area and a data storage area, wherein the program storage area may store an operating system and applications required for at least one function; the data storage area may store data created by the processor 301, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 302 may optionally include a memory remotely located relative to the processor 301, and these remote memories may be connected to the processor 301 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0092] The memory 302 stores one or more modules, which, when executed by the processor 301, perform the following operations: Figure 1 The flow rate detection method in the illustrated embodiment.

[0093] For details of the above computer equipment, please refer to Figure 1 The corresponding descriptions and effects in the embodiments shown can be understood and will not be repeated here.

[0094] An embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions capable of executing the flow rate detection method of any of the above embodiments. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD); the storage medium may also include a combination of the above types of memory.

[0095] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A flow velocity detection method, characterized in that: The steps include: Obtaining the transmission frequencies of at least two groups of ultrasonic signals and the receiving frequencies of their ultrasonic echo signals, each group of ultrasonic echo signals corresponding to a group of ultrasonic signals, the ultrasonic signals propagating in the fluid to be measured; Acquire a propagation velocity relationship function of the ultrasonic signal in the fluid to be measured, where the propagation velocity relationship function is a relationship function between the propagation velocity of the ultrasonic signal in the fluid to be measured and the emission frequency of the ultrasonic signal; Determining the flow velocity of the fluid to be measured based on at least two groups of transmitting frequencies and their corresponding two groups of receiving frequencies and the propagation velocity relationship function; Among them, it includes: using the first group of transmitting frequencies, the first group of receiving frequencies, and the propagation speed relationship function to establish a first relationship function; using the second group of transmitting frequencies, the second group of receiving frequencies, and the propagation speed relationship function to establish a second relationship function; combining the first relationship function with the second relationship function to calculate the actual flow rate of the fluid to be measured; wherein the two groups of transmitting frequencies are different.

2. The flow velocity detection method according to claim 1, characterized in that: The propagation velocity relationship function is: Wherein, K is a coefficient, ρ is the density of the fluid to be measured, ω=2πf, ω is the angular frequency of the ultrasonic signal, f is the transmission frequency, and c is the propagation speed of the ultrasonic signal in the fluid to be measured.

3. The flow velocity detection method according to claim 1, characterized in that: The at least two groups of ultrasonic signals and their corresponding ultrasonic echo signals are obtained by transmitting and receiving a group of ultrasonic transducers.

4. The flow velocity detection method according to claim 3, characterized in that: The transmitting end in the group of ultrasonic transducers transmits the ultrasonic signal through the following steps: Determine a first signal source and a second signal source, wherein the first signal source is used for the transmitting end to transmit a first transmitting frequency, and the second signal source is used for the transmitting end to transmit a second transmitting frequency, and the first transmitting frequency is different from the second transmitting frequency; The transmitting end is controlled to switch between the first signal source and the second signal source.

5. The flow velocity detection method according to claim 3, characterized in that: The transmitting end of the ultrasonic transducer is arranged on one side of the lumen axis for transmitting the fluid to be measured, and the transmitting direction of the ultrasonic signal forms a preset angle with the lumen axis.

6. The flow velocity detection method according to claim 1, characterized in that: The first relationship function or the second relationship function is: in, is the propagation velocity relationship function, ω=2πf, ω is the angular frequency of the ultrasonic signal, f' is the receiving frequency, f is the transmitting frequency, K is the coefficient, ρ is the density of the fluid to be measured, c is the propagation velocity of the ultrasonic signal in the fluid to be measured, θ is the angle between the ultrasonic signal emission direction and the axial direction of the lumen, and V is the flow velocity of the fluid to be measured.

7. A flow velocity detection device, characterized in that: include: an acquisition module, configured to acquire the transmission frequencies of at least two groups of ultrasonic signals and the receiving frequencies of their ultrasonic echo signals, wherein each group of ultrasonic echo signals corresponds to a group of ultrasonic signals, and the ultrasonic signals propagate in the fluid to be measured; a calling module, configured to obtain a propagation velocity relationship function of the ultrasonic signal in the fluid to be measured, wherein the propagation velocity relationship function is a relationship function between the propagation velocity of the ultrasonic signal in the fluid to be measured and the emission frequency of the ultrasonic signal; a determination module, configured to determine the flow velocity of the fluid to be measured based on at least two groups of transmission frequencies and their corresponding two groups of receiving frequencies and the propagation velocity relationship function; Among them, it includes: using the first group of transmitting frequencies, the first group of receiving frequencies, and the propagation speed relationship function to establish a first relationship function; using the second group of transmitting frequencies, the second group of receiving frequencies, and the propagation speed relationship function to establish a second relationship function; combining the first relationship function with the second relationship function to calculate the actual flow rate of the fluid to be measured; wherein the two groups of transmitting frequencies are different.

8. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the flow rate detection method according to any one of claims 1 to 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the flow velocity detection method according to any one of claims 1 to 6.

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