CN209432753U - A kind of ultrasonic transducer activating system - Google Patents
A kind of ultrasonic transducer activating system Download PDFInfo
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- CN209432753U CN209432753U CN201822095234.5U CN201822095234U CN209432753U CN 209432753 U CN209432753 U CN 209432753U CN 201822095234 U CN201822095234 U CN 201822095234U CN 209432753 U CN209432753 U CN 209432753U
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- 230000003750 conditioning effect Effects 0.000 claims abstract description 26
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Abstract
The utility model discloses a kind of ultrasonic transducer activating system, the utility model includes DAC signal conditioning module, power amplifier module, impedance matching module and ultrasonic transducer；The DAC signal conditioning module amplifies processing to be converted into the AC analogue signal of positive and negative variation by 0 to 3.0V digital sine wave signal, and to AC analogue signal amplitude；The power amplifier module improves power, drives late-class circuit to amplify AC analogue signal voltage and electric current；The impedance matching module, to match power amplifier module output impedance with ultrasonic transducer impedance, and then excitation ultrasound energy converter generates ultrasonic wave；The ultrasonic transducer activating system driving source of the utility model uses sine wave, and output drive signal is differential sine wave, brings greatly flexibility to system application while improving launching efficiency.
Description
Technical Field
The utility model belongs to the technical field of the ultrasonic measurement, especially an ultrasonic transducer excitation system.
Background
The ultrasonic wave has the characteristics of good directivity, strong penetrating power, concentrated sound energy and the like, and is widely applied to the technical fields of measurement such as distance measurement, speed measurement and the like. In an ultrasonic excitation system, a common excitation source comprises a pulse signal, a sine wave signal, a linear frequency modulation signal and an amplitude modulation sine wave signal, and the amplitude and the stability of an echo signal are affected by different excitation sources. At present, most ultrasonic excitation systems adopt pulse signals as excitation signals, and according to experimental research, under the condition of the same number of excitation sources and voltage amplitude, the echo amplitude and stability of the ultrasonic excitation systems are not as good as those of sine wave signals.
In the process of ultrasonic signal propagation, especially in gas, energy attenuation is fast, if the excitation system efficiency is low and the excitation stability of the ultrasonic transducer is not good, the signal-to-noise ratio of echo signals can be influenced, and the reduction of related practical application precision can be influenced to a large extent. And the existing ultrasonic transducer excitation system mostly outputs single-ended signals, and the negative electrode of the ultrasonic transducer is grounded, so that the excitation efficiency of the ultrasonic transducer is reduced.
The utility model discloses to above problem, provide an ultrasonic transducer excitation system to solve current supersound nondestructive test system and adopt the more square wave of harmonic component, and ultrasonic transducer one end ground connection, only one end receives periodic variation's excitation signal, and it is not high to lead to efficiency, the not high problem of echo signal SNR.
SUMMERY OF THE UTILITY MODEL
In order to achieve the above object, the utility model provides a following technical scheme: an ultrasonic transducer excitation system comprises an ultrasonic transducer, and is characterized by further comprising a DAC signal conditioning module, a power amplification module and an impedance matching module; wherein,
the ultrasonic transducer is used for responding to the excitation, forming resonance and emitting ultrasonic waves;
the DAC signal conditioning module is used for converting a sinusoidal signal into an alternating current signal with positive and negative changes along with the sinusoidal signal output by the DAC, and amplifying the amplitude;
the power amplification module is used for simultaneously amplifying the voltage amplitude and the current amplitude of the signal output by the DAC signal conditioning module, improving the power and driving a rear-stage circuit;
the impedance matching module is used for matching the output impedance of the power amplification module with the impedance of the ultrasonic transducer so as to excite the ultrasonic transducer to generate ultrasonic waves with the highest efficiency.
Further, preferably, the DAC signal conditioning module includes a following buffer stage and an inverting amplifier stage; wherein,
the same-direction end + INA of the following buffer stage receives a sinusoidal signal output by the digital-to-analog converter, and the reverse end-INA of the following buffer stage is directly connected with the output end OUTA thereof;
the reverse amplification stage comprises a first resistor R1, a second resistor R2, a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4 which are connected in series; the first resistor R1 and the second resistor R2 are connected in series, and an intermediate node of a connecting line between the first resistor R1 and the second resistor R2 is connected with an inverting input terminal-INB of the following buffer stage; the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 have the same resistance value;
the other end of the first resistor R1 is connected with the output end OUTA of the following buffer stage; the other end of the second resistor R2 is connected with the output end OUTB of the reverse amplification stage; the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 are connected in series, a middle node of a connecting line between the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 is connected with the same-direction end + INB of the following buffer stage, the other end of the third voltage dividing resistor R3 is connected with a +3V reference voltage, and the other end of the fourth voltage dividing resistor R4 is grounded.
Further, preferably, the DAC signal conditioning module is powered by dual power sources, and the sine wave signal conditioned by the DAC signal conditioning module is a digital sine wave signal of 0 to 3.0V.
Further, preferably, the power amplification module comprises a power operational amplifier U1 and a power operational amplifier U2; the same-direction input end + IN of the power amplifier U1 is connected with the output end OUTB of the reverse amplification stage through a first capacitor C1.
Further, preferably, the impedance matching module comprises a transformer U4, a matching inductor L1, and an ultrasonic transducer Y1; wherein,
a primary side port 1 and a primary side port 4 of the transformer U4 are respectively connected with an output end OUT of a power amplifier U1 and a power amplifier U2; the secondary side port 3 of the transformer U4 is connected with an ultrasonic transducer Y1; one end of the inductor L1 is connected with a secondary side port 6 of the transformer U4, and the other end of the inductor L1 is connected with the ultrasonic transducer Y1;
further, preferably, the power amplification module is powered by a dual power supply.
Further, as preferred, the DAC signal conditioning module realizes that the excitation source generates sine waves by a digital-to-analog converter, the number of sine wave cycles is freely programmed and controlled by a program, and the amplitude of the excitation voltage is amplified and conditioned to be 0V symmetric alternating current signals.
Further, preferably, the input pin of the excitation source of the power amplification module is grounded through a resistor to provide a loop for the input bias current, so that the voltage drift of the output signal is avoided.
Further, preferably, the power amplification module adopts a structure of single-ended input and double-ended output, and outputs differential sinusoidal signals to act on electrodes at two ends of the ultrasonic transducer, so as to improve the driving efficiency of the ultrasonic transducer.
Further, as preferred, its work process is characterized by: the microcontroller generates discrete digital sine waves through programming, outputs continuous analog sine waves through the DAC peripheral equipment, the analog sine wave signal acts on a following buffer stage of the DAC signal conditioning module and is input into the reverse amplification stage, the amplification factor is (-R2/R1), and then the output signal of the reverse amplification stage is Vout (-R2/R1) Vin + (+ 3V/2);
the conditioned sine wave signal acts on the power amplification module, the amplification times are-R6/R7, -R8/R7, and sine waves with opposite phases are output by the output ends of the power amplifier U1 and the power amplifier U2;
sine waves with opposite phases act on the primary side of the transformer U4, are output by the secondary side and are loaded on two electrodes of the ultrasonic transducer through a matching inductor L1 to emit ultrasonic waves;
the matching inductance L1 can be expressed by the formula L ═ C0RS 2)/(1+(ωsC0Rs)2) Theoretical calculation of where C0Is the static capacitance, R, of the ultrasonic transducerSIs its dynamic resistance.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a DAC signal conditioning module realizes that the excitation source produces the sine wave by digital analog converter, and sine wave cycle number can be by the free programming control of procedure, and excitation voltage amplitude is also enlarged and is taked care of to the alternating current signal for 0V symmetry.
(2) The utility model discloses a power amplification module excitation input pin passes through resistance ground connection, provides the return circuit for inputing bias current, has avoided output signal voltage drift.
(3) The utility model discloses a power amplification module adopts the structure of single-ended input bi-polar output, and output difference sinusoidal signal acts on ultrasonic transducer both ends electrode, has improved ultrasonic transducer's drive efficiency.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of an excitation system of an ultrasonic transducer according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: an ultrasonic transducer excitation system comprises an ultrasonic transducer, and is characterized by further comprising a DAC signal conditioning module, a power amplification module and an impedance matching module; wherein,
the ultrasonic transducer is used for responding to the excitation, forming resonance and emitting ultrasonic waves;
the DAC signal conditioning module is used for converting a sinusoidal signal into an alternating current signal with positive and negative changes along with the sinusoidal signal output by the DAC, and amplifying the amplitude;
the power amplification module is used for simultaneously amplifying the voltage amplitude and the current amplitude of the signal output by the DAC signal conditioning module, improving the power and driving a rear-stage circuit;
the impedance matching module is used for matching the output impedance of the power amplification module with the impedance of the ultrasonic transducer so as to excite the ultrasonic transducer to generate ultrasonic waves with the highest efficiency.
In this embodiment, as shown in fig. 1, the DAC signal conditioning module includes a following buffer stage and an inverting amplifier stage; wherein,
the same-direction end + INA of the following buffer stage receives a sinusoidal signal output by the digital-to-analog converter, and the reverse end-INA of the following buffer stage is directly connected with the output end OUTA thereof;
the reverse amplification stage comprises a first resistor R1, a second resistor R2, a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4 which are connected in series; the first resistor R1 and the second resistor R2 are connected in series, and an intermediate node of a connecting line between the first resistor R1 and the second resistor R2 is connected with an inverting input terminal-INB of the following buffer stage; the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 have the same resistance value;
the other end of the first resistor R1 is connected with the output end OUTA of the following buffer stage; the other end of the second resistor R2 is connected with the output end OUTB of the reverse amplification stage; the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 are connected in series, a middle node of a connecting line between the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 is connected with the same-direction end + INB of the following buffer stage, the other end of the third voltage dividing resistor R3 is connected with a +3V reference voltage, and the other end of the fourth voltage dividing resistor R4 is grounded.
As a better embodiment, the DAC signal conditioning module is powered by dual power sources, and the sine wave signal conditioned by the DAC signal conditioning module is a digital sine wave signal of 0 to 3.0V. The power amplification module comprises a power operational amplifier U1 and a power operational amplifier U2; the same-direction input end + IN of the power amplifier U1 is connected with the output end OUTB of the reverse amplification stage through a first capacitor C1.
As a more preferred embodiment, the impedance matching module comprises a transformer U4, a matching inductor L1, and an ultrasonic transducer Y1; wherein,
a primary side port 1 and a primary side port 4 of the transformer U4 are respectively connected with an output end OUT of a power amplifier U1 and a power amplifier U2; the secondary side port 3 of the transformer U4 is connected with an ultrasonic transducer Y1; one end of the inductor L1 is connected with the secondary side port 6 of the transformer U4, and the other end is connected with the ultrasonic transducer Y1.
As another embodiment, the power amplification module is powered by dual power sources.
The DAC signal conditioning module realizes that the excitation source generates sine waves by a digital-to-analog converter, the period number of the sine waves is freely programmed and controlled by a program, and the amplitude of the excitation voltage is amplified and conditioned to be 0V symmetrical alternating current signals. The input pin of the excitation source of the power amplification module is grounded through the resistor, a loop is provided for inputting bias current, and voltage drift of an output signal is avoided. The power amplification module adopts a structure of single-end input and double-end output, and outputs differential sinusoidal signals to act on electrodes at two ends of the ultrasonic transducer so as to improve the driving efficiency of the ultrasonic transducer.
Furthermore, the utility model discloses in, this ultrasonic transducer arouses the working process of system and is: the microcontroller generates discrete digital sine waves through programming, outputs continuous analog sine waves through the DAC peripheral equipment, the analog sine wave signal acts on a following buffer stage of the DAC signal conditioning module and is input into the reverse amplification stage, the amplification factor is (-R2/R1), and then the output signal of the reverse amplification stage is Vout (-R2/R1) Vin + (+ 3V/2);
the conditioned sine wave signal acts on the power amplification module, the amplification times are-R6/R7, -R8/R7, and sine waves with opposite phases are output by the output ends of the power amplifier U1 and the power amplifier U2;
sine waves with opposite phases act on the primary side of the transformer U4, are output by the secondary side and are loaded on two electrodes of the ultrasonic transducer through a matching inductor L1 to emit ultrasonic waves;
the matching inductance L1 can be expressed by the formula L ═ C0RS 2)/(1+(ωsC0Rs)2) Theoretical calculation of where C0Is the static capacitance, R, of the ultrasonic transducerSIs its dynamic resistance.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. An ultrasonic transducer excitation system comprises an ultrasonic transducer, and is characterized by further comprising a DAC signal conditioning module, a power amplification module and an impedance matching module; wherein,
the ultrasonic transducer is used for responding to the excitation, forming resonance and emitting ultrasonic waves;
the DAC signal conditioning module is used for converting a sinusoidal signal into an alternating current signal with positive and negative changes along with the sinusoidal signal output by the DAC, and amplifying the amplitude;
the power amplification module is used for simultaneously amplifying the voltage amplitude and the current amplitude of the signal output by the DAC signal conditioning module, improving the power and driving a rear-stage circuit;
the impedance matching module is used for matching the output impedance of the power amplification module with the impedance of the ultrasonic transducer so as to excite the ultrasonic transducer to generate ultrasonic waves with the highest efficiency.
2. An ultrasound transducer excitation system according to claim 1 wherein: the DAC signal conditioning module comprises a following buffer stage and an inverse amplification stage; wherein,
the same-direction end + INA of the following buffer stage receives a sinusoidal signal output by the digital-to-analog converter, and the reverse end-INA of the following buffer stage is directly connected with the output end OUTA thereof;
the reverse amplification stage comprises a first resistor R1, a second resistor R2, a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4 which are connected in series; the first resistor R1 and the second resistor R2 are connected in series, and an intermediate node of a connecting line between the first resistor R1 and the second resistor R2 is connected with an inverting input terminal-INB of the following buffer stage; the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 have the same resistance value;
the other end of the first resistor R1 is connected with the output end 0UTA of the following buffer stage; the other end of the second resistor R2 is connected with the output end OUTB of the reverse amplification stage; the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 are connected in series, a middle node of a connecting line between the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 is connected with the same-direction end + INB of the following buffer stage, the other end of the third voltage dividing resistor R3 is connected with a +3V reference voltage, and the other end of the fourth voltage dividing resistor R4 is grounded.
3. An ultrasound transducer excitation system according to claim 1 wherein: the DAC signal conditioning module is powered by double power supplies, and the sine wave signal conditioned by the DAC signal conditioning module is a digital sine wave signal of 0-3.0V.
4. An ultrasound transducer excitation system according to claim 1 wherein: the power amplification module comprises a power operational amplifier U1 and a power operational amplifier U2; the same-direction input end + IN of the power operational amplifier U1 is connected with the output end OUTB of the reverse amplification stage through a first capacitor C1.
5. An ultrasound transducer excitation system according to claim 1 wherein: the impedance matching module comprises a transformer U4, a matching inductor L1 and an ultrasonic transducer Y1; wherein,
a primary side port 1 and a primary side port 4 of the transformer U4 are respectively connected with an output end OUT of a power amplifier U1 and a power amplifier U2; the secondary side port 3 of the transformer U4 is connected with an ultrasonic transducer Y1; one end of the inductor L1 is connected with the secondary side port 6 of the transformer U4, and the other end is connected with the ultrasonic transducer Y1.
6. An ultrasound transducer excitation system according to claim 1 wherein: the power amplification module adopts a double power supply to supply power.
7. An ultrasound transducer excitation system according to claim 1 wherein: the DAC signal conditioning module realizes that the excitation source generates sine waves by a digital-to-analog converter, the period number of the sine waves is freely programmed and controlled by a program, and the amplitude of the excitation voltage is amplified and conditioned into OV symmetrical alternating current signals.
8. An ultrasound transducer excitation system according to claim 1 wherein: the input pin of the excitation source of the power amplification module is grounded through the resistor, a loop is provided for inputting bias current, and voltage drift of an output signal is avoided.
9. An ultrasound transducer excitation system according to claim 1 wherein: the power amplification module adopts a structure of single-end input and double-end output, and outputs differential sinusoidal signals to act on electrodes at two ends of the ultrasonic transducer so as to improve the driving efficiency of the ultrasonic transducer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444273A (en) * | 2018-12-13 | 2019-03-08 | 江苏华尔威科技集团有限公司 | A kind of ultrasonic transducer activating system |
| CN113533854A (en) * | 2020-04-13 | 2021-10-22 | 上海交通大学 | Impedance on-line measurement and dynamic matching device of ultrasonic transducer |
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2018
- 2018-12-13 CN CN201822095234.5U patent/CN209432753U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444273A (en) * | 2018-12-13 | 2019-03-08 | 江苏华尔威科技集团有限公司 | A kind of ultrasonic transducer activating system |
| CN109444273B (en) * | 2018-12-13 | 2024-02-20 | 江苏华尔威科技集团有限公司 | Ultrasonic transducer excitation system |
| CN113533854A (en) * | 2020-04-13 | 2021-10-22 | 上海交通大学 | Impedance on-line measurement and dynamic matching device of ultrasonic transducer |
| CN113533854B (en) * | 2020-04-13 | 2023-04-11 | 上海交通大学 | Impedance on-line measurement and dynamic matching device of ultrasonic transducer |
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Granted publication date: 20190924 |