CN117572018A - Measuring circuit and measuring device - Google Patents

Measuring circuit and measuring device Download PDF

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Publication number
CN117572018A
CN117572018A CN202311561135.0A CN202311561135A CN117572018A CN 117572018 A CN117572018 A CN 117572018A CN 202311561135 A CN202311561135 A CN 202311561135A CN 117572018 A CN117572018 A CN 117572018A
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China
Prior art keywords
module
signal
control
port
feedback signal
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CN202311561135.0A
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Chinese (zh)
Inventor
莫爱迪
何伟强
连振中
金勇�
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Nanjing North Road Intelligent Control Technology Co ltd
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Nanjing North Road Intelligent Control Technology Co ltd
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Application filed by Nanjing North Road Intelligent Control Technology Co ltd filed Critical Nanjing North Road Intelligent Control Technology Co ltd
Priority to CN202311561135.0A priority Critical patent/CN117572018A/en
Publication of CN117572018A publication Critical patent/CN117572018A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
    • G01P5/245—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by measuring transit time of acoustical waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The invention discloses a measuring circuit and a measuring device. The measuring circuit provided by the embodiment of the invention comprises a control module, wherein the control module is used for outputting a voltage signal and a control signal; the driving modules are connected with the control module and used for outputting excitation signals according to the voltage signals; the receiving module is connected with the control module and is used for receiving the feedback signal and outputting the feedback signal to the control module; the at least two transducers are used for outputting ultrasonic signals according to the excitation signals when being conducted with the driving module, and are also used for outputting feedback signals according to the ultrasonic signals when being conducted with the receiving module; the at least two switch modules are connected with the transducer, the receiving module, the driving module and the control module, and the switch modules are used for conducting the transducer and the driving module according to control signals or conducting the transducer and the receiving module according to control signals. The technical scheme provided by the embodiment realizes the simplification of the measuring circuit.

Description

Measuring circuit and measuring device
Technical Field
The invention relates to the technical field of wind speed measurement, in particular to a measuring circuit and a measuring device.
Background
The detection of wind speed is an important link of ventilation management of coal mines, an ultrasonic time difference method is a means for measuring wind speed, and the ultrasonic transducer has the advantages of high precision, convenience in installation, small size and the like. Because of the smaller volume of ultrasonic transducers, the closer the sound path, the transducer is typically driven in a boosted manner to improve the measurement. However, high voltages are likely to present safety hazards downhole in coal mines, and boost circuits also result in increased circuit complexity. Therefore, a measurement circuit that does not require boosting is needed.
Disclosure of Invention
The invention provides a measuring circuit which is used for solving the problem of safety reduction caused by higher voltage for driving a transducer in the prior art.
According to an aspect of the present invention, there is provided a measurement circuit comprising:
the control module is used for outputting a voltage signal and a control signal;
the driving modules are connected with the control module and used for outputting excitation signals according to the voltage signals;
the receiving module is connected with the control module and is used for receiving feedback signals;
the at least two transducers are used for outputting ultrasonic signals according to the excitation signals when being conducted with the driving module, and are also used for outputting the feedback signals according to the ultrasonic signals when being conducted with the receiving module;
the switch modules are connected with the transducer, the receiving module, the driving module and the control module, and the switch modules are used for conducting the transducer and the driving module according to the control signals or conducting the transducer and the receiving module according to the control signals.
Optionally, the receiving module includes:
the amplifying unit is connected with the switch module and is used for acquiring the feedback signal through the switch module and amplifying the feedback signal;
the timing unit is connected with the amplifying unit and the control module and is used for determining time information of the ultrasonic signal received by the transducer according to the amplified feedback signal.
Optionally, the receiving module further includes:
the detection unit is connected with the amplifying unit and the control module and is used for carrying out logarithmic detection processing on the amplified feedback signal to obtain a first processing signal;
the first processing signal is used for correcting time information of the ultrasonic signal received by the transducer.
Optionally, the amplifying unit includes:
a first triode, a first amplifier and a second amplifier;
the first end of the first triode is connected with a power supply and the inverting input end of the first amplifier, the second end of the first triode is grounded, the control end of the first triode is connected with the switch module, the non-inverting input end of the first amplifier is connected with the power supply, the output end of the first amplifier is connected with the inverting input end of the second amplifier, the non-inverting output end of the second amplifier is connected with the power supply, and the output end of the second amplifier is connected with the timing unit;
the first triode is used for acquiring the feedback signal, the first amplifier is used for filtering and primary amplifying the feedback signal, and the second amplifier is used for filtering and secondary amplifying the feedback signal.
Optionally, the timing unit includes:
the timing chip is connected with the amplifying unit and the control unit, and the timing unit is used for acquiring the amplified feedback signal and determining the time information of the ultrasonic signal received by the transducer according to the period of the amplified feedback signal.
Optionally, the detection unit includes:
the detection amplifying chip is connected with the amplifying unit and is used for carrying out logarithmic detection processing and amplifying processing on the amplified feedback signal to obtain a first analog signal;
the first comparator is connected with the detection amplifying chip and the control unit and is used for comparing the first analog signals to obtain first processed signals.
Optionally, the control module is further configured to determine a wind speed according to the time information corrected by the first processing signal.
Optionally, the driving module includes:
the second transistor, the third transistor and the first switching tube;
the first end of the second triode is connected with the control end of the third triode, the second end of the second triode is grounded, the control end of the second triode is connected with the control module, the first end of the third triode is connected with a power supply, the second end of the third triode is connected with the control end of the first switch tube, the first end of the first switch tube is connected with the power supply, and the second end of the first switch tube is connected with the switch module;
the second triode is used for acquiring the voltage signal, the third triode is used for outputting the voltage signal to the first switching tube, and the first switching tube is used for outputting an excitation signal according to the voltage signal.
Optionally, the switch module includes:
the first port, the second port, the third port, the first control end and the first switch;
the first port is connected with the driving module, the second port is connected with the receiving module, the third port is connected with the transducer, the first control end is connected with the control module, the first end of the first switch is connected with the first port and the second port, and the second end of the first switch is connected with the third port;
the first control end is used for receiving a control signal of the control unit, and the first switch is used for responding to the control signal to conduct the first port with the third port or conduct the second port with the third port.
In a second aspect, embodiments of the present invention provide a measurement device comprising any one of the measurement devices.
The measuring circuit of the embodiment of the invention comprises a control module, a receiving module, at least two driving modules, at least two transducers and at least two switch modules. The driving module is connected with the control module, the receiving module is connected with the control module, and the switching module is connected with the transducer, the receiving module, the driving module and the control module. The control module outputs a voltage signal and a control signal, the driving module outputs an excitation signal according to the voltage signal, and the switching module conducts the transducer with the driving module according to the control signal or conducts the transducer with the receiving module according to the control signal. When the transducer is conducted with the driving module, an ultrasonic signal is output according to the excitation signal, and when the transducer is conducted with the receiving module, a feedback signal is output according to the ultrasonic signal, and the receiving module receives the feedback signal and outputs the feedback signal to the control module. The measuring device provided by the embodiment of the invention realizes that the feedback signal is obtained under the condition that the excitation signal does not need to be boosted, simplifies the measuring circuit and saves the cost.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a measurement circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another measurement circuit according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a measurement circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a measurement device according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a measurement circuit according to an embodiment of the present invention. Referring to fig. 1, the measurement circuit provided in the embodiment of the present invention includes a control module 10, where the control module 10 is configured to output a voltage signal and a control signal. And at least two driving modules 20, wherein the driving modules 20 are connected with the control module 10, and the driving modules 20 are used for outputting excitation signals according to the voltage signals. The receiving module 30, the receiving module 30 is connected with the control module 10, and the receiving module 30 is configured to receive the feedback signal and output the feedback signal to the control module 10. At least two transducers 40, the transducers 40 are used for outputting ultrasonic signals according to the excitation signals when being conducted with the driving module 20, and the transducers 40 are also used for outputting feedback signals according to the ultrasonic signals when being conducted with the receiving module 30. At least two switch modules 50, the switch modules 50 are connected with the transducer 40, the receiving module 30, the driving module 20 and the control module 10, and the switch modules 50 are used for conducting the transducer 40 with the driving module 20 according to the control signal or conducting the transducer 40 with the receiving module 30 according to the control signal.
Specifically, the measurement circuit includes a control module 10, a receiving module 30, at least two driving modules 20, at least two transducers 40, and at least two switching modules 50. Fig. 1 illustrates an exemplary case where the measurement circuit includes four transducers 40. Wherein, the transducers 40 need to be arranged in an even number, and each two transducers 40 are arranged in a group corresponding to each other. When one is used to transmit an ultrasonic signal, the other is used to receive an ultrasonic signal and vice versa. Each transducer 40 is connected to a switching module 50, and the switching module 50 can change its conductive state in response to a control signal from the control module 10, so that the transducer 40 is conductive to the driving module 20 or conductive to the receiving module 30.
When the transducer 40 is connected to the driving module 20, the transducer 40 will serve as an ultrasonic transmitting end, and the transducer 40 corresponding to the transducer 40 is connected to the receiving module 30 to serve as an ultrasonic receiving end. The driving module 20 outputs an excitation signal to the transducer 40 at the transmitting end according to the voltage signal of the control module 10, and the transducer 40 outputs an ultrasonic signal to the transducer 40 at the receiving end according to the excitation signal. The transducer 40 at the receiving end outputs a feedback signal according to the ultrasonic signal, and the receiving module 30 outputs the received feedback signal to the control module 10. At this time, the control module 10 may calculate the wind speed according to the time of sending the voltage signal and the time of receiving the feedback signal, thereby completing the measurement of the wind speed.
Illustratively, when measuring wind speed by the measurement circuit, the control module 10 sends control signals to the two switch modules 50 of a set of transducers 40, respectively. One of the switch modules 50 conducts the transducer 40 with the driving module 20 as an ultrasonic wave transmitting end, and the other switch module 50 conducts the transducer 40 with the receiving module 30 as an ultrasonic wave receiving end.
The control module 10 sends a voltage signal to the driving module 20, the driving module 20 outputs an excitation signal to the transducer 40 at the transmitting end according to the voltage signal of the control module 10, and the transducer 40 outputs an ultrasonic signal to the transducer 40 at the receiving end according to the excitation signal. The transducer 40 at the receiving end outputs a feedback signal according to the ultrasonic signal, and the receiving module 30 outputs the received feedback signal to the control module 10. At this time, the control module 10 may calculate the wind speed according to the time of sending the voltage signal and the time of receiving the feedback signal, thereby completing the measurement of the wind speed.
According to the measuring circuit provided by the embodiment of the invention, the control module is arranged to send the control signal to change the conduction state of the switch module, so that the feedback signal output by the transducer is obtained, the control module calculates the wind speed according to the time of sending the voltage signal and the time of receiving the feedback signal, the feedback signal is obtained under the condition that the excitation signal is not required to be boosted, the measuring circuit is simplified, and the cost is saved.
Optionally, fig. 2 is a schematic structural diagram of a measurement circuit according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 2, the receiving module 30 includes an amplifying unit 31, the amplifying unit 31 is connected to the switching module 50, and the amplifying unit 31 is configured to acquire a feedback signal through the switching module 50 and amplify the feedback signal. The timing unit 32, the timing unit 32 is connected with the amplifying unit 31 and the control module 10, and the timing unit 32 is used for determining time information of the ultrasonic signal received by the transducer 40 according to the amplified feedback signal.
Specifically, the receiving module 30 includes an amplifying unit 31 and a timing unit 32, where the amplifying unit 31 may acquire the feedback signal output by the switching module 50 and amplify the feedback signal. The timing unit 32 may determine, according to the feedback signal, time information of the ultrasonic signal received by the transducer 40 at the receiving end and output the time information to the control module 10. The control module 10 may then calculate the wind speed based on the time the voltage signal was sent by itself and the time the ultrasonic signal was received by the transducer 40. This arrangement can improve the measurement accuracy of the measurement circuit.
Optionally, with continued reference to fig. 2 on the basis of the above embodiment, the receiving module 30 further includes a detecting unit 33, where the detecting unit 33 is connected to the amplifying unit 31 and the control module 10, and the detecting unit 33 is configured to perform logarithmic detection processing on the amplified feedback signal to obtain a first processed signal. The first processed signal is used to modify the time information that the ultrasonic signal was received by the transducer 40.
Specifically, the receiving module 30 may further be provided with a detecting unit 33, where the detecting unit 33 may acquire the amplified feedback signal and perform logarithmic detection processing, and convert the feedback signal in the form of a sine wave into the first processing signal in the form of a square wave. Since the amplitude of the feedback signal is small, the timing unit 32 may determine the waveform of the second period of the feedback signal as the waveform of the first period, thereby causing an error in the time information determined by the timing unit 32. The detection unit 33 converts the feedback signal into a first processed signal in the form of a square wave, and corrects the time information determined by the timer unit 32 according to the period of the square wave. This arrangement can further improve the measurement accuracy of the measurement circuit.
Alternatively, with continued reference to fig. 2 on the basis of the above-described embodiment, the amplifying unit 31 includes a first transistor 34, a first amplifier 35, and a second amplifier 36. The first end of the first triode 34 is connected with a power supply and the inverting input end of the first amplifier 35, the second end of the first triode 34 is grounded, the control end of the first triode 34 is connected with the switch module 50, the non-inverting input end of the first amplifier 35 is connected with the power supply, the output end of the first amplifier 35 is connected with the inverting input end of the second amplifier 36, the non-inverting output end of the second amplifier 36 is connected with the power supply, and the output end of the second amplifier 36 is connected with the timing unit 32. The first triode 34 is used for acquiring a feedback signal, the first amplifier 35 is used for filtering and performing primary amplification processing on the feedback signal, and the second amplifier 36 is used for filtering and performing secondary amplification processing on the feedback signal.
Specifically, the amplifying unit 31 includes a first transistor 34 for acquiring a feedback signal, and a first amplifier 35 and a second amplifier 36 for amplifying the feedback signal. The control terminal of the first triode 34 acquires a feedback signal from the switch module 50 and outputs the feedback signal to the first amplifier 35. The first amplifier 35 filters and first amplifies the feedback signal and outputs the filtered feedback signal to the second amplifier 36. The feedback signal is further filtered and amplified by the second amplifier 36 and then output to the timer unit 32 and the detector unit 33 via the output terminals. The amplification effect of the signal can be improved by the arrangement, and the testing precision is further improved.
Optionally, with continued reference to fig. 2 on the basis of the above embodiment, the timing unit 32 includes a timing chip 37, where the timing chip 37 is connected to the amplifying unit 31 and the control unit, and the timing unit 32 is configured to obtain the amplified feedback signal, and determine, according to a period of the amplified feedback signal, time information of the ultrasonic signal received by the transducer 40.
Specifically, a timing chip 37 may be provided as the timing unit 32, and the timing chip 37 may acquire the feedback signal amplified by the amplifying unit 31. The feedback signal is sinusoidal, and the starting point of the first period of the feedback signal, that is, the time information of the ultrasonic signal received by the transducer 40, can be determined according to the waveform and the period of the amplified feedback signal. The timing unit 32 may also be implemented by other devices or circuits having timing function.
Optionally, with continued reference to fig. 2 based on the foregoing embodiment, the detecting unit 33 includes a detecting and amplifying chip 38, where the detecting and amplifying chip 38 is connected to the amplifying unit 31, and the detecting and amplifying chip 38 is configured to perform logarithmic detection processing and amplification processing on the amplified feedback signal to obtain the first analog signal. The first comparator 39, the first comparator 39 is connected with the detection amplifying chip 38 and the control unit, and the first comparator 39 is used for comparing the first analog signal to obtain a first processed signal.
Specifically, a detection amplification chip 38 may be provided as the detection unit 33, and the detection amplification chip 38 may acquire the feedback signal amplified by the amplification unit 31. The feedback signal is a sine wave with gradually increased amplitude and then gradually reduced amplitude, and after logarithmic detection and amplification processing, the feedback signal can be tidied into a first analog signal. The logarithmic detection can be considered as taking the peaks of sine waves of unequal amplitude in the feedback signal to form a continuous pulse-like signal waveform, i.e. the first analog signal. After comparison by the first comparator 39, a first processed signal in the form of a square wave is obtained. The detection unit 33 may further be configured to amplify the first analog signal by an amplifier to enhance the effect of the first comparator 39 generating the first processed signal. This arrangement can further improve the test accuracy.
Optionally, with continued reference to fig. 2, based on the above embodiment, the control module 10 is further configured to determine the wind speed according to the corrected time information of the first processing signal.
Specifically, the timing unit 32 determines the time information of the ultrasonic signal received by the transducer 40 according to the start time of the first period of the feedback signal, however, the timing unit 32 may determine the waveform of the second period of the feedback signal as the waveform of the first period, thereby causing an error in the time information determined by the timing unit 32. The control module 10 may modify the time information determined by the timing unit 32 based on the first processing signal.
For example, when the start time of the first processing signal is earlier or later than the time information determined by the timer unit 32 and the time difference exceeds a certain threshold, the timer unit 32 may be considered to generate a false positive. At this time, the control module 10 may advance or retard the time information determined by the timing unit 32 by one period of the feedback signal, thereby improving the test accuracy.
Alternatively, with continued reference to fig. 2, the drive module 20 includes a second transistor 21, a third transistor 22, and a first switching transistor 23, based on the above embodiments. The first end of the second triode 21 is connected with the control end of the third triode 22, the second end of the second triode 21 is grounded, the control end of the second triode 21 is connected with the control module 10, the first end of the third triode 22 is connected with a power supply, the second end of the third triode 22 is connected with the control end of the first switch tube 23, the first end of the first switch tube 23 is connected with the power supply, and the second end of the first switch tube 23 is connected with the switch module 50. The second triode 21 is used for acquiring a voltage signal, the third triode 22 outputs the voltage signal to the first switching tube 23, and the first switching tube 23 is used for outputting an excitation signal according to the voltage signal.
Specifically, the driving module 20 includes a second transistor 21, a third transistor 22, and a first switching transistor 23. The second transistor 21 obtains a voltage signal from the control module 10 through a control end and outputs the voltage signal to the third transistor 22, and the third transistor 22 outputs the voltage signal to the first switching tube 23, so that the first switching tube 23 outputs an excitation signal to the switching module 50 according to the voltage signal of the control module 10. This arrangement allows the stimulus signal to be adjusted according to the test requirements.
Optionally, with continued reference to fig. 2 based on the above embodiment, the switch module 50 includes a first port a, a second port b, a third port c, a first control terminal d, and a first switch 51. The first port a is connected with the driving module 20, the second port b is connected with the receiving module 30, the third port c is connected with the transducer 40, the first control end d is connected with the control module 10, the first end of the first switch 51 is connected with the first port a and the second port b, and the second end of the first switch 51 is connected with the third port c. The first control terminal d is configured to receive a control signal of the control unit, and the first switch 51 is configured to conduct the first port a with the third port c or conduct the second port b with the third port c in response to the control signal.
Specifically, the switch module 50 is connected to the driving module 20 through the first port a, to the receiving module 30 through the second port b, and to the transducer 40 through the third port c. The first control terminal d changes its conducting state according to the control signal of the control module 10, and the first switch 51 conducts the first port a with the third port c or conducts the second port b with the third port c. When one port is in communication with the third port c, the drive module 20 is in communication with the transducer 40 through the switch module 50. When the second port b is in communication with the third port c, the receiving module 30 is in communication with the transducer 40 through the switching module 50. The direction of the transmitted signal and the received signal can be changed according to the test requirement, and the plurality of transducers share one measuring circuit, so that the cost is saved.
Fig. 3 is a schematic circuit diagram of a measurement circuit according to an embodiment of the present invention. On the basis of the above-described embodiment, referring to fig. 3, the control module 10 is connected with the driving module 20, the switching module 50, and the receiving module 30. The driving module 20 is connected to a switching module 50, and the switching module 50 is connected to the transducer 40 and the amplifying unit 31. The amplifying unit 31 is connected to the timer unit 32 and the detector unit 33, and the timer unit 32 and the detector unit 33 are connected to the control module 10. The measurement circuit also includes other devices such as resistors, capacitors, amplifiers, and crystal oscillators, connected in the configuration shown in fig. 3.
When measuring wind speed by the measuring circuit, the control module 10 sends control signals to the two switch modules 50 of the group of transducers 40, respectively. The first control terminal d of one of the switch modules 50 conducts the first port a with the third port c according to the control signal of the control module 10. At this time, the transducer 40 is turned on to the driving module 20 as an ultrasonic transmitting end, and the other switching module 50 turns on the second port b to the third port c, and at this time, the transducer 40 is turned on to the receiving module 30 as an ultrasonic receiving end.
The control module 10 sends a voltage signal to the driving module 20, the second transistor outputs the voltage signal to the third transistor 22, and the third transistor 22 outputs the voltage signal to the first switching transistor 23, so that the first switching transistor 23 outputs an excitation signal according to the current switching frequency. The transducer 40 at the transmitting end outputs an ultrasonic signal to the transducer 40 at the receiving end according to the excitation signal. The transducer 40 at the receiving end outputs a feedback signal according to the ultrasonic signal, and the first triode 34 acquires the feedback signal and outputs the feedback signal to the first amplifier 35. The first amplifier 35 filters and first amplifies the feedback signal and outputs the filtered feedback signal to the second amplifier 36. The feedback signal is further filtered and amplified by the second amplifier 36 and then output to the timer unit 32 and the detector unit 33 via the output terminals.
The timing chip 37 acquires the amplified feedback signal. From the waveform and period of the amplified feedback signal, the start time of the first period of the feedback signal, i.e., the time information at which the ultrasonic signal was received by the transducer 40, may be determined. The detection amplification chip 38 acquires the amplified feedback signal, and generates a first analog signal after logarithmic detection and amplification processing. The comparison is performed by the first comparator 39 to obtain a first processed signal. The control module 10 determines a time difference between the starting point of the first processing signal and the time information determined by the timing unit 32 according to the first processing signal, and then corrects the time information determined by the timing unit 32. The control module 10 calculates the wind speed according to the time of sending out the voltage signal and the corrected time information, thereby completing the measurement of the wind speed.
Optionally, fig. 4 is a schematic structural diagram of a measurement device according to an embodiment of the present invention. On the basis of the foregoing embodiments, referring to fig. 2, the measuring device 200 provided in the embodiment of the present invention includes the measuring circuit 100 in any of the foregoing embodiments, and has the beneficial effects of the measuring circuit 100 in any of the foregoing embodiments, which are not described herein again.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A measurement circuit, comprising:
the control module is used for outputting a voltage signal and a control signal;
the driving modules are connected with the control module and used for outputting excitation signals according to the voltage signals;
the receiving module is connected with the control module and is used for receiving the feedback signal and outputting the feedback signal to the control module;
the at least two transducers are used for outputting ultrasonic signals according to the excitation signals when being conducted with the driving module, and are also used for outputting the feedback signals according to the ultrasonic signals when being conducted with the receiving module;
the switch modules are connected with the transducer, the receiving module, the driving module and the control module, and are used for conducting the transducer and the driving module according to the control signals or conducting the transducer and the receiving module according to the control signals.
2. The measurement circuit of claim 1, wherein the receiving module comprises:
the amplifying unit is connected with the switch module and is used for acquiring the feedback signal through the switch module and amplifying the feedback signal;
the timing unit is connected with the amplifying unit and the control module and is used for determining time information of the ultrasonic signal received by the transducer according to the amplified feedback signal.
3. The measurement circuit of claim 2, wherein the receiving module further comprises:
the detection unit is connected with the amplifying unit and the control module and is used for carrying out logarithmic detection processing on the amplified feedback signal to obtain a first processing signal;
the first processing signal is used for correcting time information of the ultrasonic signal received by the transducer.
4. The measurement circuit of claim 2, wherein the amplifying unit comprises:
a first triode, a first amplifier and a second amplifier;
the first end of the first triode is connected with a power supply and the inverting input end of the first amplifier, the second end of the first triode is grounded, the control end of the first triode is connected with the switch module, the non-inverting input end of the first amplifier is connected with the power supply, the output end of the first amplifier is connected with the inverting input end of the second amplifier, the non-inverting output end of the second amplifier is connected with the power supply, and the output end of the second amplifier is connected with the timing unit;
the first triode is used for acquiring the feedback signal, the first amplifier is used for filtering and primary amplifying the feedback signal, and the second amplifier is used for filtering and secondary amplifying the feedback signal.
5. The measurement circuit of claim 2, wherein the timing unit comprises:
the timing chip is connected with the amplifying unit and the control unit, and the timing unit is used for acquiring the amplified feedback signal and determining the time information of the ultrasonic signal received by the transducer according to the period of the amplified feedback signal.
6. A measurement circuit according to claim 3, wherein the detection unit comprises:
the detection amplifying chip is connected with the amplifying unit and is used for carrying out logarithmic detection processing and amplifying processing on the amplified feedback signal to obtain a first analog signal;
the first comparator is connected with the detection amplifying chip and the control unit and is used for comparing the first analog signals to obtain first processed signals.
7. A measurement circuit according to claim 3, wherein the control module is further configured to determine wind speed based on the time information corrected by the first processing signal.
8. The measurement circuit of claim 1, wherein the drive module comprises:
the second transistor, the third transistor and the first switching tube;
the first end of the second triode is connected with the control end of the third triode, the second end of the second triode is grounded, the control end of the second triode is connected with the control module, the first end of the third triode is connected with a power supply, the second end of the third triode is connected with the control end of the first switch tube, the first end of the first switch tube is connected with the power supply, and the second end of the first switch tube is connected with the switch module;
the second triode is used for acquiring the voltage signal, the third triode is used for outputting the voltage signal to the first switching tube, and the first switching tube is used for outputting an excitation signal according to the voltage signal.
9. The measurement circuit of claim 1, wherein the switch module comprises:
the first port, the second port, the third port, the first control end and the first switch;
the first port is connected with the driving module, the second port is connected with the receiving module, the third port is connected with the transducer, the first control end is connected with the control module, the first end of the first switch is connected with the first port and the second port, and the second end of the first switch is connected with the third port;
the first control end is used for receiving a control signal of the control unit, and the first switch is used for responding to the control signal to conduct the first port with the third port or conduct the second port with the third port.
10. A measuring device comprising a measuring circuit according to any one of claims 1-9.
CN202311561135.0A 2023-11-21 2023-11-21 Measuring circuit and measuring device Pending CN117572018A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311561135.0A CN117572018A (en) 2023-11-21 2023-11-21 Measuring circuit and measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311561135.0A CN117572018A (en) 2023-11-21 2023-11-21 Measuring circuit and measuring device

Publications (1)

Publication Number Publication Date
CN117572018A true CN117572018A (en) 2024-02-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311561135.0A Pending CN117572018A (en) 2023-11-21 2023-11-21 Measuring circuit and measuring device

Country Status (1)

Country Link
CN (1) CN117572018A (en)

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