CN107449475B - Ultrasonic flowmeter - Google Patents
Ultrasonic flowmeter Download PDFInfo
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- CN107449475B CN107449475B CN201710800631.5A CN201710800631A CN107449475B CN 107449475 B CN107449475 B CN 107449475B CN 201710800631 A CN201710800631 A CN 201710800631A CN 107449475 B CN107449475 B CN 107449475B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
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- Measuring Volume Flow (AREA)
Abstract
The embodiment of the invention discloses an ultrasonic flowmeter, which comprises a measuring pipeline, at least one pair of ultrasonic transducers and an ultrasonic flowmeter transmitter, wherein the ultrasonic flowmeter transmitter comprises a program-controlled amplifying and automatic gain control module, a control module and an analysis module, the program-controlled amplifying and automatic gain control module is respectively connected with the control module and the analysis module, and the program-controlled amplifying and automatic gain control module is used for adaptively adjusting the amplitude of an echo electric signal received by the ultrasonic transducers by utilizing a two-stage adaptive gain adjusting loop. According to the embodiment of the invention, the ultrasonic flowmeter transmitter with the program-controlled amplifying and automatic gain control module is arranged in the ultrasonic flowmeter, so that the received echo electric signal can be subjected to self-adaptive adjustment of the amplitude through the two-stage self-adaptive gain adjustment loop, the effect of stabilizing the amplitude of the echo electric signal is achieved, the accurate measurement of the echo electric signal is realized, and the requirement of the measurement accuracy of a system is met.
Description
Technical Field
The embodiment of the invention relates to the technical field of flow measurement, in particular to an ultrasonic flowmeter.
Background
As one of the most advanced and accurate flow measuring instruments in the world at present, the ultrasonic flowmeter is widely applied to the occasions of detection, trade handover metering and the like of technical processes in industries such as petroleum, petrochemical industry, chemical industry, pharmacy, papermaking, food, energy and the like, and can easily determine the volume flow in a pipeline.
In the existing ultrasonic flowmeter, each transducer is a transmitting transducer and a receiving transducer, ultrasonic measurement signals can be alternately transmitted and received along the medium flow direction and the reverse direction, forward flow and reverse flow propagation time measurement conversion of each channel is carried out through the ultrasonic flowmeter transducer, and finally the propagation flow velocity and instantaneous flow data of the medium in the measurement pipeline are output.
However, in the existing ultrasonic flowmeter, due to the fact that the characteristics of the transducers are different and the installation sizes are different, the sound paths of the channels are different, and due to the fact that the flow field of a pipeline medium is affected, laminar flow and turbulent flow exist, the amplitude of echo electric signals received by each measurement is different, and the signal intensity is unstable.
Disclosure of Invention
The embodiment of the invention provides an ultrasonic flowmeter, which is characterized in that a program-controlled amplifying and automatic gain control module is arranged in a transmitter of the ultrasonic flowmeter, so that the amplitude of an echo electric signal is adaptively regulated, the accurate measurement of the ultrasonic echo electric signal is realized, and the requirement of the measurement accuracy of an ultrasonic flowmeter system is met.
The embodiment of the invention provides an ultrasonic flowmeter, which comprises a measuring pipeline, at least one pair of ultrasonic transducers and an ultrasonic flowmeter transmitter, wherein,
the at least one pair of ultrasonic transducers are arranged on the pipe wall of the measuring pipe and connected with the ultrasonic flowmeter transmitter and are used for transmitting ultrasonic signals and receiving ultrasonic echo signals, converting the ultrasonic echo signals into echo electric signals and transmitting the echo electric signals to the ultrasonic flowmeter transmitter;
the ultrasonic flow meter transmitter includes: the program-controlled amplifying and automatic gain control module is respectively connected with the control module and the analysis module, wherein,
the program-controlled amplifying and automatic gain control module is used for adaptively adjusting the amplitude of the echo electric signal received by the ultrasonic transducer by utilizing a two-stage adaptive gain adjustment loop;
the control module is used for assisting the program-controlled amplification and automatic gain control module to complete two-stage self-adaptive gain adjustment of the echo electric signal;
the analysis module is used for receiving the signals sent by the program-controlled amplification and automatic gain control module and analyzing the signals to obtain the propagation flow velocity and instantaneous flow data of the medium in the measurement pipeline.
According to the embodiment of the invention, the ultrasonic flowmeter transmitter with the program-controlled amplifying and automatic gain control module, the measuring pipeline and at least one pair of ultrasonic transducers are arranged in the ultrasonic flowmeter, so that the received echo electric signal can be subjected to self-adaptive amplitude adjustment through the two-stage self-adaptive gain adjustment loop before being analyzed and processed by the analysis module, the effect of stabilizing the amplitude of the echo electric signal is achieved, the accurate measurement of the echo electric signal is realized, and the requirement of the measurement accuracy of an ultrasonic flowmeter system is met.
Drawings
FIG. 1a is a schematic view showing the external structure of an ultrasonic flowmeter according to a first embodiment of the present invention;
FIG. 1b is a schematic view of the internal structure of an ultrasonic flow meter transducer body according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of an ultrasonic flow meter transducer according to a second embodiment of the present invention;
fig. 3 is a schematic view of the internal structure of an ultrasonic flow meter in a third embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
The embodiment provides an ultrasonic flowmeter. Fig. 1a is a schematic diagram of the external structure of an ultrasonic flowmeter 100 according to a first embodiment of the present invention, as shown in fig. 1a, the flowmeter includes: measurement piping 110, at least one pair of ultrasonic transducers 120, and an ultrasonic flow meter transducer 130, wherein,
at least one pair of ultrasonic transducers 120 is mounted on the wall of the measuring pipe 110 and connected to the ultrasonic flowmeter transmitter 130 for transmitting ultrasonic signals and receiving ultrasonic echo signals, and converting the ultrasonic echo signals into echo electric signals to be transmitted to the ultrasonic flowmeter transmitter 130.
Illustratively, a single channel ultrasonic flow meter is described:
the measuring pipe 110 is respectively provided with a mounting seat (not shown in the figure) for fixing two ultrasonic transducers 120, and the two ultrasonic transducers 120 can be fixed on the measuring pipe 110 through the mounting seats; a junction box 131 is arranged between the mounting seats, the junction box 131 is used as a part of the ultrasonic flowmeter transmitter 130, a signal conditioning and collecting module (not shown in the figure) can be arranged in the junction box, and interfaces (not shown in the figure) of the ultrasonic transducer 120 can be arranged at two ends of the junction box 131 so that the signal conditioning and collecting module can control the ultrasonic transducer 120; an ultrasonic flowmeter transmitter main body 132 can be arranged at the upper part of the junction box, and the ultrasonic flowmeter transmitter main body 132 is connected with a signal conditioning and acquisition module in the junction box 131; the main body 132 of the ultrasonic flowmeter transmitter may be internally provided with a program-controlled amplifying and automatic gain control module, an analysis module, an input/output module, a power-off protection module, a power management module, a man-machine interaction interface and an external expansion RAM module (each module is not shown in the figure), and in addition, input/output devices (not shown in the figure) such as keys and an LCD display screen may be fixed on the main body of the ultrasonic flowmeter transmitter.
Fig. 1b is a schematic structural diagram of the inside of an ultrasonic flowmeter transmitter main body 132 according to an embodiment of the invention, and as shown in fig. 1b, the ultrasonic flowmeter transmitter main body 132 specifically includes the following structures:
the program-controlled amplifying and automatic gain control module 1321, the control module 1322 and the analysis module 1323, the program-controlled amplifying and automatic gain control module 1321 is respectively connected with the control module 1322 and the analysis module 1323, wherein,
the program-controlled amplifying and automatic gain control module 1321 is configured to adaptively adjust the amplitude of the echo electric signal received by the ultrasonic transducer by using a two-stage adaptive gain adjustment loop.
For ultrasonic flow meters, each ultrasonic transducer may function as both a transmitting transducer and a receiving transducer. Taking a single-channel ultrasonic flowmeter as an example, if one ultrasonic transducer is set as a transmitting transducer and the other ultrasonic transducer corresponding to the ultrasonic transducer is set as a receiving transducer, the two transducers can alternately transmit and receive ultrasonic measurement signals along the medium flow direction and the medium flow reverse direction. After receiving the ultrasonic echo signal, the ultrasonic transducer converts the ultrasonic echo signal into an echo electric signal and sends the echo electric signal to a signal analysis processing module of the ultrasonic flowmeter for processing. However, due to the fact that the characteristics of the ultrasonic transducers are different, the installation sizes of the ultrasonic transducers are different, the sound paths of the ultrasonic transducers are different, and due to the influence of the pipeline medium flow field and the laminar flow and the turbulent flow, the sizes of the received signals measured each time are different, and the signal strength is unstable, so that in order to achieve accurate measurement of ultrasonic echo electric signals, automatic feedback gain adjustment is needed for the echo electric signals received by the ultrasonic transducers.
In this embodiment, a programmable amplification and automatic gain control module 1321 is disposed in the ultrasonic flowmeter transmitter 130, and the programmable amplification and automatic gain control module 1321 can implement adaptive adjustment of the amplitude of the echo electric signal through a two-stage adaptive gain adjustment loop.
The control module 1322 is configured to assist the program-controlled amplifying and automatic gain control module 1321 to complete two-stage adaptive gain adjustment of the echo electric signal.
The analysis module 1323 is configured to receive the signal sent by the programmable amplification and automatic gain control module 1321 and analyze the signal to obtain the propagation flow rate and the instantaneous flow data of the medium in the measurement pipe 110.
In this embodiment, for example, after the echo electric signal received by the ultrasonic transducer 120 along the flow direction of the medium is adjusted by the program-controlled amplifying and automatic gain control module 1321 and the control module 1322, the amplitude is stable and relatively accurate, and after the analysis module 1323 receives the echo electric signal with stable amplitude, the echo electric signal is analyzed by using a preset analysis algorithm to obtain a signal time value along the flow direction of the medium. Otherwise, the above-mentioned flow is repeated by the signal channel switching circuit to obtain the signal time value along the reverse direction of the medium flow, and the time difference between the signal time value and the signal time value is converted by a series of analysis to obtain the propagation flow velocity and instantaneous flow data of the medium in the measuring pipeline 110.
According to the ultrasonic flowmeter provided by the embodiment, the ultrasonic flowmeter transmitter with the program-controlled amplifying and automatic gain control module, the measuring pipeline and at least one pair of ultrasonic transducers are arranged in the ultrasonic flowmeter, so that the received echo electric signal can be subjected to self-adaptive amplitude adjustment through the two-stage self-adaptive gain adjustment loop before being analyzed and processed by the analysis module, the effect of stabilizing the amplitude of the echo electric signal is achieved, the accurate measurement of the echo electric signal is realized, and the requirement of the measurement accuracy of an ultrasonic flowmeter system is met.
Further, the ultrasonic flowmeter transmitter main body 132 may further include a signal conditioning and collecting module, where the signal conditioning and collecting module is connected to the ultrasonic transducer 120 and the control module 1322, and is configured to generate a high-voltage ultrasonic excitation electrical signal to excite the ultrasonic transducer to generate an ultrasonic signal, and control the two ultrasonic transducers 120 in the same channel to switch between a transmitting function and a receiving function and control each channel along with a signal channel switching circuit.
Specifically, the signal conditioning and collecting module comprises a signal channel switching circuit, an excitation boost circuit, a signal transmitting circuit and a signal receiving circuit, wherein,
and the signal channel switching circuit is connected with the control module 1322 and the ultrasonic transducers 120 and is used for controlling the two ultrasonic transducers 120 in the same channel to switch between a transmitting function and a receiving function and switch between channels.
The excitation boost circuit is connected with the control module 1322 and the signal transmitting circuit, and is used for receiving the excitation signal generated by the control module 1322, performing boost processing, obtaining a high-voltage excitation signal and transmitting the high-voltage excitation signal to the signal transmitting circuit.
The signal transmitting circuit is also connected with the ultrasonic transducer 120 and is used for exciting the ultrasonic transducer 120 to generate ultrasonic signals after receiving the high-voltage excitation signal.
And the signal receiving circuit is connected with the ultrasonic transducer 120 and is used for receiving ultrasonic echo signals generated by ultrasonic signals transmitted by the transmitting transducer of the same channel under the piezoelectric effect and converting the ultrasonic echo signals into echo electric signals.
The working process of the ultrasonic flowmeter is described in detail by taking a single-channel ultrasonic flowmeter as an example:
along the medium flow direction, the control module 1322 in the ultrasonic flowmeter transmitter 130 controls to generate an excitation signal to be sent to the excitation boost circuit, and meanwhile, the control signal channel switching circuit sets one ultrasonic transducer 120 in the ultrasonic flowmeter 100 as a transmitting transducer and sets the other ultrasonic transducer 120 as a receiving transducer according to a preset rule; the excitation boost circuit receives the excitation signal sent by the control module 1322, then carries out boost processing on the excitation signal, and sends the high-voltage excitation signal to the signal transmitting circuit; the signal transmitting circuit utilizes the high-voltage excitation signal to excite the transmitting transducer to generate an ultrasonic signal; after the ultrasonic signal propagates in the medium of the measurement pipeline 110 for a period of time, the ultrasonic signal is received and converted into an ultrasonic echo electric signal by the receiving transducer, and then the receiving transducer sends the echo electric signal to the program-controlled amplifying and automatic gain control module 1321; the control module 1322 assists the program-controlled amplification and automatic gain control module 1321 to adaptively adjust the amplitude of the echo electric signal by using a two-stage adaptive gain adjustment loop, and sends the echo electric signal after adjustment to the analysis module 1323 for analysis; after receiving the echo electric signal with stable amplitude, the analysis module 1323 analyzes the echo electric signal by using a preset algorithm to obtain a signal time value along the flow direction of the medium. And otherwise, repeating the flow through a signal channel switching circuit to obtain a signal time value along the reverse direction of the medium flow, and obtaining the propagation flow velocity and instantaneous flow data of the medium in the measuring pipeline through a series of analysis conversion on the time difference between the signal time value and the signal time value.
Example two
On the basis of the first embodiment, the present embodiment provides a specific composition structure of a program-controlled amplifying and automatic gain control module, and fig. 2 is a schematic structural diagram of an ultrasonic flowmeter transmitter provided in the second embodiment of the present invention, as shown in fig. 2, the ultrasonic flowmeter transmitter 2000 specifically includes the following structures:
a signal receiving circuit 2101, a primary amplifying circuit 2102, a secondary amplifying circuit 2103, a peak sample-and-hold circuit 2105, an analog-to-digital converter 2106, a control module 2200, a digital-to-analog converter 2107, a voltage adjusting circuit 2108, an adaptive gain control chip 2109, an adaptive closed-loop feedback circuit 2110, a detection circuit 2111 and an analysis module 2300; the signal receiving circuit 2101, the primary amplifying circuit 2102, the secondary amplifying circuit 2103, the peak sample-and-hold circuit 2105, the analog-to-digital converter 2106, the digital-to-analog converter 2107, the voltage adjusting circuit 2108, the self-gain control chip 2109, the adaptive closed-loop feedback circuit 2110 and the detection circuit 2111 together form the program-controlled amplifying and automatic gain control module 2100, and it should be noted that, for simplifying the circuit, the analog-to-digital converter 2106 and the digital-to-analog converter 2107 may be integrated into the control module 2200.
The signal receiving circuit 2101 is connected with the primary amplifying circuit 2102, the secondary amplifying circuit 2103, the peak sample-and-hold circuit 2105, the analog-to-digital converter 2106, the control module 2200, the digital-to-analog converter 2107, the voltage adjusting circuit 2108, the self-gain control chip 2109, the self-adaptive closed-loop feedback circuit 2110 and the detection circuit 2111, wherein the peak sample-and-hold circuit 2105 is also connected with the self-adaptive closed-loop feedback circuit 2110, and forms a primary self-adaptive gain adjusting loop together with the analog-to-digital converter 2106, the control module 2200, the digital-to-analog converter 2107, the voltage adjusting circuit 2108 and the self-gain control chip 2109; the detection circuit 2111 is also connected to the analog-to-digital converter 2106, and forms a two-stage adaptive gain adjustment loop together with the control module 2200, the digital-to-analog converter 2107, the voltage adjustment circuit 2108, the self-gain control chip 2109, and the adaptive closed-loop feedback circuit 2110.
A signal receiving circuit 2101 for receiving an echo electric signal transmitted by the ultrasonic transducer;
a primary amplifying circuit 2102 for pre-amplifying the echo electric signal;
a secondary amplification circuit 2103 for secondarily amplifying the echo electric signal after the pre-amplification;
in this embodiment, the amplitude of the echo electric signal sent by the ultrasonic transducer is relatively small, and in order to facilitate the subsequent processing, the primary amplifying circuit 2102 and the secondary amplifying circuit 2103 may be used to perform two-stage amplifying processing, so as to obtain the echo electric signal with the amplitude within the range required by the subsequent processing.
A peak sample-and-hold circuit 2105, configured to, in a process of sampling the echo electric signal after two-stage amplification by the analog-to-digital converter 2106, make the amplitude of the echo electric signal after two-stage amplification remain stable, and send the echo electric signal with stable amplitude to the adaptive closed-loop feedback circuit 2110;
the analog/digital converter 2106 is configured to convert the echo electric signal with stable amplitude into a first digital signal, and receive the echo electric signal in the last sampling process fed back by the detection circuit 2111, and convert the echo electric signal in the last sampling process into a second digital signal, so that the control module 2200 can perform corresponding processing on the first digital signal and the second digital signal by using a preset algorithm;
the control module 2200 is configured to perform a first proportional-derivative-integral adjustment on the first digital signal, and perform feedback correction on the digital signal after the first proportional-derivative-integral adjustment by using a preset algorithm and the second digital signal, so as to obtain a second proportional-derivative-integral adjustment signal;
a digital-to-analog converter 2107 for converting the second proportional-differential-integral adjustment signal to an analog signal and transmitting the analog signal to a voltage adjustment module 2108;
a voltage adjusting circuit 2108 for adjusting the voltage amplitude of the analog signal to adapt to the gain control voltage of the input signal of the automatic gain control chip;
the self-gain control chip 2109 is used for performing voltage automatic gain control on the analog signal subjected to voltage amplitude adjustment;
the adaptive closed-loop feedback circuit 2110 is further connected to the analysis module 2300, and is configured to perform adaptive gain adjustment on a signal output by the automatic gain control chip 2109 by using the received echo electric signal with stable amplitude as a reference, implement primary adaptive gain adjustment control on the echo electric signal, and send the signal after adaptive gain adjustment to the analysis module 2300;
the detection circuit 2111 is further connected to the analysis module 2300, and is configured to filter the signal after the adaptive gain adjustment, and send the signal to the analysis module 2300; and feeds the processed signal back to the analog-to-digital converter 2106 so as to perform second proportional-differential-integral adjustment on the echo electric signal in the next sampling process, thereby realizing the second-stage adaptive gain adjustment control of the echo electric signal.
The analysis module 2300 is configured to receive the signals sent by the adaptive closed-loop feedback circuit 2110 and the detection circuit 2111, and analyze the signals by using a preset analysis algorithm to obtain data of the propagation flow rate and the instantaneous flow rate of the medium in the measurement pipeline.
According to the ultrasonic flowmeter transmitter in the ultrasonic flowmeter, through the first-stage self-adaptive gain adjustment loop and the second-stage self-adaptive gain adjustment loop in the program-controlled amplification and automatic gain control module, double adjustment of the echo electric signal in the current sampling and the echo electric signal after the last two-stage feedback gain adjustment is fully utilized, so that the self-adaptive adjustment of the amplitude can be completed before the echo electric signal received in the current sampling is analyzed and processed by the analysis module, the effect of stabilizing the amplitude of the echo electric signal is achieved, accurate measurement of the echo electric signal is realized, and the requirement of the system measurement accuracy is met.
Taking a single-channel ultrasonic flowmeter as an example, the working process of the ultrasonic flowmeter transducer is described in detail:
along the direction of medium flow, the echo electric signal is received by the signal receiving circuit 2101, and then sequentially passes through the primary amplifying circuit 2102 and the secondary amplifying circuit 2103 to complete two-stage amplification of amplitude; the echo electric signal after two-stage amplification reaches a peak value sampling circuit 2105 to carry out amplitude maintenance, so that the echo signal obtained by sampling by a subsequent analog/digital converter 2106 is a signal with stable amplitude; after the sampling of the analog/digital converter 2106 is completed, the echo electric signal with stable amplitude is converted into a first digital signal, the echo electric signal fed back by the detection circuit 2111 in the last sampling process is converted into a second digital signal, and the first digital signal and the second digital signal are sent to the control module 2200; the control module 2200 performs a first proportional-differential-integral adjustment on the first digital signal, performs feedback correction on the digital signal subjected to the first proportional-differential-integral adjustment by using a preset algorithm and a second digital signal to obtain a second proportional-differential-integral adjustment signal, and sends the second proportional-differential-integral adjustment signal to the digital-to-analog converter 2107; the digital-to-analog converter 2107 converts the second proportional-differential-integral adjustment signal into an analog signal and then sends the signal to the voltage adjustment circuit 2108; after the voltage adjusting circuit 2108 adjusts the voltage amplitude of the analog signal, the signal is sent to the self-gain control chip 2109; the self-gain control chip 2109 performs voltage automatic gain control on the analog signal subjected to voltage amplitude adjustment and then sends the signal to the self-adaptive closed-loop feedback circuit 2110; the adaptive closed-loop feedback circuit 2110 uses the received echo electric signal with stable amplitude as a reference, performs adaptive gain adjustment on the signal output by the automatic gain control chip 2109 in a preset mode, realizes the primary adaptive gain adjustment control of the echo electric signal, and sends the signal after the adaptive gain adjustment to the analysis module 2300; the detection circuit 2111 filters the signal subjected to the adaptive gain adjustment, and transmits the signal to the analysis module 2300; and feeding the processed signal back to the analog-to-digital converter 2106 so as to perform second proportional-differential-integral adjustment on the echo electric signal in the next sampling process, thereby realizing the second-stage adaptive gain adjustment control of the echo electric signal; after receiving the signals sent by the adaptive closed-loop feedback circuit 2110 and the detection circuit 2111, the analysis module 2300 uses a preset analysis algorithm to analyze the signals, and obtains a signal time value along the flow direction of the medium. And otherwise, repeating the flow through a signal channel switching circuit to obtain a signal time value along the reverse direction of the medium flow, and obtaining the propagation flow velocity and instantaneous flow data of the medium in the measuring pipeline through a series of analysis conversion on the time difference between the signal time value and the signal time value.
Further, the control module of the ultrasonic flow meter transmitter may preferably comprise an ARM control chip.
Further, the analysis module of the ultrasonic flow meter transmitter may preferably comprise a field programmable gate array CPLD chip.
Further, the ultrasonic flow meter transducer may further include:
the input and output module is connected with the control module and the analysis module and is used for receiving control signals input by a user and outputting information obtained by the control module and the analysis module, and the module can comprise a 4-20 mA current loop, a pulse output circuit and an RS485 communication interface.
The power-down protection module is connected with the control module and the analysis module and is used for storing parameters and metering data of the ultrasonic flowmeter in a storage unit of the ultrasonic flowmeter transmitter when the power supply of the ultrasonic flowmeter is insufficient or the power is off.
The power management module is connected with the program-controlled amplifying and automatic gain control module, the analysis module, the input and output module and the power-down protection module and is used for providing power for the program-controlled amplifying and automatic gain control module, the analysis module, the input and output module and the power-down protection module.
And the man-machine interaction interface is connected with the control module and the analysis module and is used for connecting external input equipment and display equipment so as to realize man-machine interaction.
And the external expansion RAM module is connected with the control module and the analysis module and is used for storing data when the storage space of the control module and the analysis module is insufficient.
Example III
Fig. 3 is a schematic diagram of an internal structure of an ultrasonic flowmeter according to a third embodiment of the present invention, as shown in fig. 3, a power management module 327 in a transmitter 320 of the ultrasonic flowmeter is connected with and supplies power to a junction box 3210, a program-controlled amplifying and automatic gain control module 322, a control module 323, an analysis module 324, an input/output module 325, a power-down protection module 326, a man-machine interaction interface 328 and an external expansion RAM module 329, respectively; the control module 323 controls the signal conditioning and acquisition module 321 in the junction box 3210 to excite the ultrasonic transducer 310 to generate ultrasonic signals; the program-controlled amplifying and automatic gain control module 322 receives the ultrasonic echo electric signal sent by the ultrasonic transducer 310, the control module 323 assists in completing two-stage adaptive gain adjustment control, and then the adjusted signal is sent to the analysis module 324 for processing. Wherein the control module 323 and the analysis module 324 may be integrated into one control analysis module. The input/output module 325, the power-down protection module 326, the man-machine interaction interface 328 and the flash RAM module 329 are all connected with the control analysis module to realize respective functions.
According to the ultrasonic flowmeter provided by the embodiment, the ultrasonic flowmeter transmitter with the program-controlled amplifying and automatic gain control module and the at least one pair of ultrasonic transducers are arranged in the ultrasonic flowmeter, so that the received echo electric signal can be subjected to self-adaptive adjustment of the amplitude through the two-stage self-adaptive gain adjustment loop before being analyzed and processed by the analysis module, the effect of stabilizing the amplitude of the echo electric signal is achieved, the accurate measurement of the echo electric signal is realized, and the requirement of the measurement accuracy of an ultrasonic flowmeter system is met.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. An ultrasonic flowmeter comprising a measurement pipeline and at least one pair of ultrasonic transducers, characterized in that the ultrasonic flowmeter further comprises an ultrasonic flowmeter transducer, wherein,
the at least one pair of ultrasonic transducers are arranged on the pipe wall of the measuring pipe and connected with the ultrasonic flowmeter transmitter and are used for transmitting ultrasonic signals and receiving ultrasonic echo signals, converting the ultrasonic echo signals into echo electric signals and transmitting the echo electric signals to the ultrasonic flowmeter transmitter;
the ultrasonic flow meter transmitter includes: the program-controlled amplifying and automatic gain control module is respectively connected with the control module and the analysis module, wherein,
the program-controlled amplifying and automatic gain control module is used for adaptively adjusting the amplitude of the echo electric signal received by the ultrasonic transducer by utilizing a two-stage adaptive gain adjustment loop;
the control module is used for assisting the program-controlled amplification and automatic gain control module to complete two-stage self-adaptive gain adjustment of the echo electric signal;
the analysis module is used for receiving the signals sent by the program-controlled amplification and automatic gain control module and analyzing the signals to obtain the propagation flow velocity and instantaneous flow data of the medium in the measurement pipeline;
the program-controlled amplifying and automatic gain control module comprises: the signal receiving circuit, the primary amplifying circuit, the secondary amplifying circuit, the peak value sampling and holding circuit, the analog-to-digital converter, the digital-to-analog converter, the voltage regulating circuit, the self-gain control chip, the self-adaptive closed-loop feedback circuit and the detection circuit are sequentially connected, wherein,
the signal receiving circuit is used for receiving the echo electric signal sent by the ultrasonic transducer;
the peak value sampling and holding circuit is also connected with the self-adaptive closed-loop feedback circuit and is used for enabling the amplitude of the echo electric signal after two-stage amplification to be stable in the process of sampling the echo electric signal after two-stage amplification by the analog-to-digital converter and simultaneously sending the echo electric signal with stable amplitude to the self-adaptive closed-loop feedback circuit;
the analog-to-digital converter is used for converting the echo electric signal with stable amplitude into a first digital signal, receiving the echo electric signal fed back by the detection circuit in the last sampling process, and converting the echo electric signal in the last sampling process into a second digital signal, so that the control module can correspondingly process the first digital signal and the second digital signal by using a preset algorithm;
the control module is used for performing first proportional-differential-integral adjustment on the first digital signal, and performing feedback correction on the digital signal subjected to the first proportional-differential-integral adjustment by using a preset algorithm and the second digital signal to obtain a second proportional-differential-integral adjustment signal;
the digital-to-analog converter is used for converting the second proportional-differential-integral adjustment signal into an analog signal and transmitting the analog signal to the voltage adjustment circuit;
the voltage adjusting circuit is used for adjusting the voltage amplitude of the analog signal so as to adapt to the gain control voltage of the input signal of the self-gain control chip;
the self-gain control chip is used for performing voltage automatic gain control on the analog signal subjected to voltage amplitude adjustment;
the self-adaptive closed-loop feedback circuit is also connected with the analysis module and is used for carrying out self-adaptive gain adjustment on the signal output by the self-gain control chip by taking the received echo electric signal with stable amplitude as a reference and adopting a preset mode to realize the primary self-adaptive gain adjustment control of the echo electric signal, and transmitting the signal after self-adaptive gain adjustment to the analysis module;
the detection circuit is also connected with the analysis module and the analog-to-digital converter and is used for processing the signal subjected to the self-adaptive gain adjustment and then sending the processed signal to the analysis module; the processed signal is fed back to the analog-to-digital converter so as to carry out second proportional-differential-integral adjustment on the echo electric signal in the next sampling process, and the second-stage self-adaptive gain adjustment control of the echo electric signal is realized;
the control module comprises an ARM control chip;
the analysis module comprises a field programmable gate array CPLD chip.
2. The ultrasonic flow meter of claim 1, wherein the ultrasonic flow meter comprises a plurality of ultrasonic flow sensors,
the primary amplifying circuit is used for pre-amplifying the echo electric signal;
the secondary amplifying circuit is used for carrying out secondary amplification on the echo electric signal after the pre-amplification.
3. The ultrasonic flow meter of claim 1, wherein the ultrasonic flow meter transducer further comprises: the signal conditioning and collecting module is connected with the ultrasonic transducer and the control module and is used for generating high-voltage ultrasonic excitation electric signals to excite the ultrasonic transducer to generate the ultrasonic signals, and controlling the two ultrasonic transducers in the same channel to switch between a transmitting function and a receiving function and controlling each channel to switch along with a signal channel switching circuit.
4. The ultrasonic flow meter of any of claims 1-3, wherein the ultrasonic flow meter transducer further comprises:
and the input and output module is connected with the control module and the analysis module and is used for receiving control signals input by a user and outputting information obtained by the control module and the analysis module.
5. The ultrasonic flow meter of claim 4, wherein the ultrasonic flow meter transducer further comprises:
the power-down protection module is connected with the control module and the analysis module and is used for storing parameters and metering data of the ultrasonic flowmeter in a storage unit of the ultrasonic flowmeter transmitter when the ultrasonic flowmeter is insufficient in power supply or is powered off.
6. The ultrasonic flow meter of claim 5, wherein the ultrasonic flow meter transducer further comprises:
the power management module is connected with the program-controlled amplifying and automatic gain control module, the analysis module, the input and output module and the power-down protection module and is used for providing power for the program-controlled amplifying and automatic gain control module, the analysis module, the input and output module and the power-down protection module.
7. The ultrasonic flow meter of claim 6, wherein the ultrasonic flow meter transducer further comprises:
and the man-machine interaction interface is connected with the control module and the analysis module and is used for connecting external input equipment and display equipment so as to realize man-machine interaction.
8. The ultrasonic flow meter of claim 7, wherein the ultrasonic flow meter transducer further comprises:
and the external expansion RAM module is connected with the control module and the analysis module and is used for storing data when the storage space of the control module and the analysis module is insufficient.
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| CN109682432A (en) * | 2019-01-29 | 2019-04-26 | 安徽天康(集团)股份有限公司 | A kind of ultrasonic measurement steam-flow meter |
| CN112414483A (en) * | 2020-11-10 | 2021-02-26 | 宁波智复物联科技有限公司 | Self-adaptive method for acquiring metering signals of ultrasonic water meter |
| CN112857490A (en) * | 2021-01-15 | 2021-05-28 | 深圳市宏电技术股份有限公司 | Flow calculation device and calculation method |
| CN112971533A (en) * | 2021-03-04 | 2021-06-18 | 佛山市顺德区美的洗涤电器制造有限公司 | Control method and control device for water dispenser, storage medium and processor |
| CN114295169B (en) * | 2021-12-30 | 2022-07-29 | 浙江磐博科技有限公司 | Automatic adjustment system and method for ultrasonic signals of gas ultrasonic flowmeter |
| CN115144041A (en) * | 2022-06-30 | 2022-10-04 | 东北大学 | Multi-channel ultrasonic flowmeter system |
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