CN109856251B - Electromagnetic ultrasonic transducer with improved resonance control and control method thereof - Google Patents
Electromagnetic ultrasonic transducer with improved resonance control and control method thereof Download PDFInfo
- Publication number
- CN109856251B CN109856251B CN201910138815.9A CN201910138815A CN109856251B CN 109856251 B CN109856251 B CN 109856251B CN 201910138815 A CN201910138815 A CN 201910138815A CN 109856251 B CN109856251 B CN 109856251B
- Authority
- CN
- China
- Prior art keywords
- frequency
- main controller
- coil
- echo
- echo signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses an electromagnetic ultrasonic transducer for improving resonance control and a control method thereof, wherein the electromagnetic ultrasonic transducer comprises a high-frequency power oscillation signal output circuit, a coil with a bias magnetic field, an echo signal detection circuit and a main controller; the high-frequency power oscillation signal output circuit consists of a high-frequency inversion driving circuit, an impedance matching network and a static matching capacitor, and the echo signal detection circuit comprises a high-voltage isolation circuit and an echo signal filter circuit; the main controller is used for collecting the filtered ultrasonic echo signals and adjusting the high-frequency inversion driving frequency according to the envelope amplitude feedback of the ultrasonic echo signals. The control method of the electromagnetic ultrasonic transducer with improved resonance control can provide power pulse voltage required by the electromagnetic ultrasonic transducer, and the static matching capacitor and the coil work in a quasi-resonance state, so that a maximum power ultrasonic signal can be excited in an object to be detected, the harmonic content is low, and the detection precision of the electromagnetic ultrasonic transducer with improved resonance control is high.
Description
Technical Field
The invention relates to the field of nondestructive flaw detection, in particular to an electromagnetic ultrasonic transducer and a control method thereof.
Background
The urgent need of industrial nondestructive inspection detection technology drives the development of electromagnetic ultrasonic transducer technology, and improves the quality and influence of industrial products and the service life of machine equipment. The electromagnetic ultrasonic detection technology has the advantages of no damage to an object to be detected, no need of a coupling agent, high propagation speed, long detection distance and the like, and is widely applied to the field of nondestructive inspection.
The input impedance of the electromagnetic ultrasonic transducer can change along with the difference of factors such as temperature, load, parasitic parameters and lift-off, when the output impedance of the driving power supply is not matched with the input impedance of the transducer, an excitation signal can be reflected on a transmission line to form standing waves, so that the efficiency of the transducer is reduced, the ultrasonic energy inside an object to be detected is lost, the power requirement of ultrasonic detection cannot be met, and the measurement precision is influenced. At the same time, the internal parameters of the electromagnetic ultrasonic transducer also change, resulting in a shift of the natural resonant frequency of the excitation coil.
In the traditional technology, the output frequency is mainly controlled by tracking the resonance point of the electromagnetic ultrasonic transducer, the configuration of an impedance matching network and a static matching capacitor is often ignored, and the driving frequency of the electromagnetic ultrasonic transducer is not adjusted by echo signal feedback, so that ultrasonic waves with a large amount of harmonic waves are excited in an object to be detected, and the detection precision is influenced.
Therefore, an electromagnetic ultrasonic transducer and a control method thereof capable of performing feedback control on the end ultrasonic echo are urgently needed to improve the efficiency of the transducer, so as to generate a high-quality ultrasonic signal and adjust the matching speed and the matching precision of the ultrasonic signal.
Disclosure of Invention
In view of this, the present invention provides an electromagnetic ultrasonic transducer with improved resonance control and a control method thereof, wherein an envelope amplitude of a terminal ultrasonic echo signal is used as a feedback to control an output frequency of the electromagnetic ultrasonic transducer, so that an excitation coil excites an ultrasonic wave with a maximum power in an object to be detected, thereby solving a technical problem that an existing detection method excites a large amount of harmonics in the object to be detected to affect detection accuracy.
The invention discloses an electromagnetic ultrasonic transducer with improved resonance control, which comprises a high-frequency power oscillation signal output circuit, a coil with a bias magnetic field, an echo signal detection circuit and a main controller, and is characterized in that:
the high-frequency power oscillation signal output circuit is composed of a high-frequency inversion driving circuit, an impedance matching network and a static matching capacitor, wherein the high-frequency inversion driving circuit is used for generating rectangular power pulses, the rectangular power pulses sequentially pass through the impedance matching network, the static matching capacitor and a coil with a bias magnetic field, the impedance matching network and the static matching capacitor are used for adjusting the voltage amplitude of the rectangular power pulses, and the coil with the bias magnetic field is used for exciting ultrasonic waves in an object to be detected and receiving ultrasonic echo signals reflected from the object to be detected;
the echo signal detection circuit comprises a high-voltage isolation circuit and an echo signal filter circuit;
the coil with the bias magnetic field receives an ultrasonic echo signal, inputs the echo signal into the high-voltage isolation circuit, and inputs the echo signal into the main controller after being filtered by the echo signal filter circuit;
the main controller is used for collecting the filtered ultrasonic echo signals, extracting the envelope amplitude of the echo signals, adjusting the high-frequency inversion driving frequency according to the envelope amplitude and feeding back the adjusted high-frequency inversion driving frequency to the high-frequency inversion driving circuit.
Further, the impedance matching network is a capacitance-inductance-capacitance passive network.
The control method of the electromagnetic ultrasonic transducer with improved resonance control comprises the following steps:
step 1, driving signal frequency f of high-frequency inversion driving circuit is set as initial frequency f0Generating a rectangular power pulse, exciting a coil with a bias magnetic field after passing through an impedance matching network and a static matching capacitor, exciting ultrasonic waves in an object to be detected, and reflecting ultrasonic wave echoes after the ultrasonic waves encounter defects or cross sections;
step 2, the ultrasonic echo acts on a coil with a bias magnetic field to change the voltage at two ends of the coil, voltage signals at two ends of the coil are input into a high-voltage isolation circuit and then input into a main controller after passing through an echo signal filter circuit, the main controller collects the echo signal at the moment and obtains an absolute value of the envelope amplitude of the echo signal at the (i-1) th time through a software matching, tracking, noise removal and envelope amplitude extraction algorithm, and the absolute value is recorded as Z (i-1);
step 3, the main controller increases the value of the driving signal frequency f to f by the step aiAt a frequency fiAn excitation coil;
step 4, the main controller collects the absolute value of the envelope amplitude of the echo signal at the moment and records the absolute value as Z (i);
step 5, the main controller judges whether the difference value between the current echo envelope amplitude Z (i) and the previous echo envelope amplitude Z (i-1) is larger than a preset constant threshold epsilon through software, if yes, 1 is added to i, and then the step 3 is skipped; if not, continuing to execute the step 6, wherein the threshold value epsilon is used for avoiding the flat-top effect generated by the algorithm;
step 6, the main controller judges whether the difference value between the current echo envelope amplitude Z (i) and the previous echo envelope amplitude Z (i-1) is smaller than a preset constant threshold value-epsilon through software, if yes, 1 is subtracted from i, and then the step 7 is skipped; if not, continuing to execute the step 8;
step 7, the main controller reduces the value of the driving frequency f to f by the step aiAt a frequency fiExciting the coil, and jumping to the step 4;
step 8, the main controller adds 1 to i, and increases the value of the driving frequency f to f by the step 4aiAt a frequency fiAn excitation coil;
9, the main controller acquires the absolute value of the envelope amplitude of the echo signal at the moment and records the absolute value as Z (i + 4);
step 10, the main controller decreases i by 1, and decreases the value of the driving frequency f to f by the step 4aiAt a frequency fiAn excitation coil;
step 11, the main controller collects the absolute value of the envelope amplitude of the echo signal at the moment and records the absolute value as Z (i-4);
step 12, the main controller judges whether the difference value obtained by subtracting Z (i) from Z (i +4) and the difference value obtained by subtracting Z (i) from Z (i-4) are smaller than a preset constant threshold value-epsilon or not through software, if yes, the step 13 is continuously executed; if not, skipping to the step 3;
and step 13, retrieving the frequency f corresponding to the absolute value Z (i) of the envelope amplitude of the wave signal, and exciting the coil by using the frequency f.
Further, the value range of the step distance a is 0< a < 1.
Further, the value range of the preset constant threshold value epsilon is 0< epsilon < 10.
The invention has the beneficial effects that:
the invention relates to an electromagnetic ultrasonic transducer with improved resonance control and a control method thereof, wherein the control method can provide power pulse voltage required by the electromagnetic ultrasonic transducer, and a static matching capacitor and a coil work in a quasi-resonance state, so that the power pulse voltage can obtain larger voltage gain on the coil, and a maximum power ultrasonic signal is excited in an object to be detected, the harmonic content is small, and the detection precision of the electromagnetic ultrasonic transducer with improved resonance control is high.
Drawings
FIG. 1 is a schematic block diagram of an electromagnetic ultrasonic transducer with improved resonance control according to the present invention.
Fig. 2 is a schematic block diagram of an electromagnetic ultrasonic transducer with improved resonance control according to the present invention.
Fig. 3 is a flow chart of the control method of the electromagnetic ultrasonic transducer for improving resonance control according to the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
The first embodiment is as follows: as shown in fig. 1, the electromagnetic ultrasonic transducer with improved resonance control in this embodiment includes a high-frequency power oscillation signal output circuit, a coil with a bias magnetic field, an echo signal detection circuit, and a main controller.
The high-frequency power oscillation signal output circuit is composed of a high-frequency inversion driving circuit, an impedance matching network and a static matching capacitor, wherein the rear stage of the high-frequency inversion driving circuit is connected with the impedance matching network, the rear stage of the impedance matching network is connected with the static matching capacitor, and the rear stage of the static matching capacitor is connected with a coil with a bias magnetic field. The coil with the bias magnetic field is placed on the surface of the object to be measured with a certain lift-off distance. The high-frequency inversion driving circuit is used for generating rectangular power pulses, the rectangular power pulses sequentially pass through an impedance matching network, a static matching capacitor and a coil with a bias magnetic field, the impedance matching network and the static matching capacitor are used for adjusting the voltage amplitude of the rectangular power pulses, and the coil with the bias magnetic field is used for exciting ultrasonic waves in an object to be detected and receiving ultrasonic echo signals reflected from the object to be detected.
The echo signal detection circuit comprises a high-voltage isolation circuit and an echo signal filter circuit.
And the coil with the bias magnetic field receives an ultrasonic echo signal, inputs the echo signal into the high-voltage isolation circuit, and inputs the echo signal into the main controller after filtering the echo signal by the echo signal filtering circuit.
The main controller is used for collecting the filtered ultrasonic echo signals, extracting the envelope amplitude of the echo signals, adjusting the high-frequency inversion driving frequency according to the envelope amplitude and feeding back the adjusted high-frequency inversion driving frequency to the high-frequency inversion driving circuit.
As shown in fig. 2, the high-frequency inverter driving circuit described in this embodiment specifically includes a DC voltage source DC, a voltage-stabilizing capacitor C, and four power switching tubes (Q1, Q2, Q3, Q4), and the DC voltage generates a pulse power voltage after passing through an inverter circuit. The impedance matching network consists of a capacitor C1, an inductor L1 and a capacitor C2, wherein the capacitor C1 is connected in parallel with the high-frequency inverter driving circuit, one end of the capacitor C1 is connected in series with the inductor L1, and the tail end of the inductor L1 is connected in parallel with the capacitor C2. The pulse power voltage generated by the high-frequency inversion driving circuit generates a quasi-sinusoidal pulse power voltage with voltage gain after passing through the impedance matching network. The static matching capacitor is Cr and has the function of generating resonance with the inductance coil Lr. The induction coil Lr with the bias magnetic field has the function of exciting ultrasonic waves in an object to be detected, wherein r is the equivalent series resistance of the induction coil Lr. The impedance matching network described in this embodiment is a capacitance-inductance-capacitance passive network.
In this embodiment, the echo signal filter circuit is an RC filter circuit.
Of course, in the prior art, there are various forms of high-frequency inverter driving circuits, impedance matching networks, high-voltage isolation circuits and echo signal filtering circuits, and the high-frequency inverter driving circuits, the impedance matching networks, the high-voltage isolation circuits and the echo signal filtering circuits can be selected according to requirements in specific implementation.
In a second embodiment, the method for controlling an electromagnetic ultrasonic transducer with improved resonance control in this embodiment includes the following steps:
step 1, driving signal frequency f of high-frequency inversion driving circuit is set as initial frequency f0Generating a rectangular power pulse, exciting a coil with a bias magnetic field after passing through an impedance matching network and a static matching capacitor, exciting ultrasonic waves in an object to be detected, and reflecting ultrasonic wave echoes after the ultrasonic waves encounter defects or cross sections;
step 2, the ultrasonic echo acts on a coil with a bias magnetic field to change the voltage at two ends of the coil, voltage signals at two ends of the coil are input into a high-voltage isolation circuit and then input into a main controller after passing through an echo signal filter circuit, the main controller collects the echo signal at the moment and obtains an absolute value of the envelope amplitude of the echo signal at the (i-1) th time through a software matching, tracking, noise removal and envelope amplitude extraction algorithm, and the absolute value is recorded as Z (i-1);
step 3, the main controller increases the value of the frequency f of the driving signal to fi by the step a, and excites the coil by the frequency fi;
step 4, the main controller collects the absolute value of the envelope amplitude of the echo signal at the moment and records the absolute value as Z (i);
step 5, the main controller judges whether the difference value between the current echo envelope amplitude Z (i) and the previous echo envelope amplitude Z (i-1) is larger than a preset constant threshold epsilon through software, if yes, 1 is added to i, and then the step 3 is skipped; if not, continuing to execute the step 6, wherein the threshold value epsilon is used for avoiding the flat-top effect generated by the algorithm;
step 6, the main controller judges whether the difference value between the current echo envelope amplitude Z (i) and the previous echo envelope amplitude Z (i-1) is smaller than a preset constant threshold value-epsilon through software, if yes, 1 is subtracted from i, and then the step 7 is skipped; if not, continuing to execute the step 8;
step 7, the main controller reduces the value of the driving frequency f to fi by the step a, excites the coil by the frequency fi, and then jumps to the step 4;
step 8, the main controller adds 1 to i, increases the value of the driving frequency f to fi by the step 4a, and excites the coil by the frequency fi;
9, the main controller acquires the absolute value of the envelope amplitude of the echo signal at the moment and records the absolute value as Z (i + 4);
step 10, the main controller decreases the value of the driving frequency f to fi by subtracting 1 from i, and excites the coil by using the frequency fi;
step 11, the main controller collects the absolute value of the envelope amplitude of the echo signal at the moment and records the absolute value as Z (i-4);
step 12, the main controller judges whether the difference value obtained by subtracting Z (i) from Z (i +4) and the difference value obtained by subtracting Z (i) from Z (i-4) are smaller than a preset constant threshold value-epsilon or not through software, if yes, the step 13 is continuously executed; if not, skipping to the step 3;
and step 13, retrieving the frequency f corresponding to the absolute value Z (i) of the envelope amplitude of the wave signal, and exciting the coil by using the frequency f.
In this embodiment, the range of the step distance a is 0< a <1, and the range of the preset constant threshold value epsilon is 0< epsilon < 10.
In the electromagnetic ultrasonic transducer with improved resonance control and the control method thereof in the embodiment, the control method can provide the power pulse voltage required by the electromagnetic ultrasonic transducer, and the static matching capacitor and the coil work in the quasi-resonance state, so that the power pulse voltage can obtain larger voltage gain on the coil, a maximum power ultrasonic signal can be excited in an object to be detected, the harmonic content is small, and the detection precision of the electromagnetic ultrasonic transducer with improved resonance control is high.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (5)
1. An electromagnetic ultrasonic transducer for improving resonance control comprises a high-frequency power oscillation signal output circuit, a coil with a bias magnetic field, an echo signal detection circuit and a main controller, and is characterized in that:
the high-frequency power oscillation signal output circuit is composed of a high-frequency inversion driving circuit, an impedance matching network and a static matching capacitor, the high-frequency inversion driving circuit is used for generating rectangular power pulses, the rectangular power pulses sequentially pass through the impedance matching network, the static matching capacitor and a coil with a bias magnetic field, the impedance matching network and the static matching capacitor are used for adjusting the voltage amplitude of the rectangular power pulses, and the coil with the bias magnetic field is used for exciting ultrasonic waves in an object to be detected and receiving ultrasonic echo signals reflected from the object to be detected;
the echo signal detection circuit comprises a high-voltage isolation circuit and an echo signal filter circuit;
the coil with the bias magnetic field receives an ultrasonic echo signal, inputs the echo signal into the high-voltage isolation circuit, and inputs the echo signal into the main controller after being filtered by the echo signal filter circuit;
the master control controller is used for collecting the filtered ultrasonic echo signals, extracting the envelope amplitude of the echo signals, adjusting the high-frequency inversion driving frequency according to the envelope amplitude and feeding back the adjusted high-frequency inversion driving frequency to the high-frequency inversion driving circuit.
2. The electromagnetic ultrasonic transducer with improved resonance control of claim 1, wherein: the impedance matching network is a capacitance-inductance-capacitance passive network.
3. A method of controlling an electromagnetic ultrasonic transducer with improved resonance control as claimed in claim 1 or 2, characterized by: the method comprises the following steps:
step 1, driving signal frequency f of high-frequency inversion driving circuit is set as initial frequency f0Generating a rectangular power pulse, exciting a coil with a bias magnetic field after passing through an impedance matching network and a static matching capacitor, exciting ultrasonic waves in an object to be detected, and reflecting ultrasonic wave echoes after the ultrasonic waves encounter defects or cross sections;
step 2, the ultrasonic echo acts on a coil with a bias magnetic field to change the voltage at two ends of the coil, voltage signals at two ends of the coil are input into a high-voltage isolation circuit and then input into a main controller after passing through an echo signal filter circuit, the main controller collects the echo signal at the moment and obtains an absolute value of the envelope amplitude of the echo signal at the (i-1) th time through a software matching, tracking, noise removal and envelope amplitude extraction algorithm, and the absolute value is recorded as Z (i-1);
step 3, the main controller increases the value of the driving signal frequency f to f by the step aiAt a frequency fiAn excitation coil;
step 4, the main controller collects the absolute value of the envelope amplitude of the echo signal at the moment and records the absolute value as Z (i);
step 5, the main controller judges whether the difference value between the current echo envelope amplitude Z (i) and the previous echo envelope amplitude Z (i-1) is larger than a preset constant threshold epsilon through software, if yes, 1 is added to i, and then the step 3 is skipped; if not, continuing to execute the step 6, wherein the threshold value epsilon is used for avoiding the flat-top effect generated by the algorithm;
step 6, the main controller judges whether the difference value between the current echo envelope amplitude Z (i) and the previous echo envelope amplitude Z (i-1) is smaller than a preset constant threshold value-epsilon through software, if yes, 1 is subtracted from i, and then the step 7 is skipped; if not, continuing to execute the step 8;
step 7, the main controller reduces the value of the driving frequency f to f by the step aiAt a frequency fiExciting the coil, and jumping to the step 4;
step 8, the main controller adds 1 to i, and increases the value of the driving frequency f to f by the step 4aiAt a frequency fiAn excitation coil;
9, the main controller acquires the absolute value of the envelope amplitude of the echo signal at the moment and records the absolute value as Z (i + 4);
step 10, the main controller decreases i by 1, and decreases the value of the driving frequency f to f by the step 4aiAt a frequency fiAn excitation coil;
step 11, the main controller collects the absolute value of the envelope amplitude of the echo signal at the moment and records the absolute value as Z (i-4);
step 12, the main controller judges whether the difference value obtained by subtracting Z (i) from Z (i +4) and the difference value obtained by subtracting Z (i) from Z (i-4) are smaller than a preset constant threshold value-epsilon or not through software, if yes, the step 13 is continuously executed; if not, skipping to the step 3;
and step 13, retrieving the frequency f corresponding to the absolute value Z (i) of the envelope amplitude of the wave signal, and exciting the coil by using the frequency f.
4. The control method of an electromagnetic ultrasonic transducer with improved resonance control according to claim 3, characterized in that: the value range of the step distance a is 0< a < 1.
5. The control method of an electromagnetic ultrasonic transducer with improved resonance control according to claim 3, characterized in that: the value range of the preset constant threshold value epsilon is 0< epsilon < 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910138815.9A CN109856251B (en) | 2019-02-25 | 2019-02-25 | Electromagnetic ultrasonic transducer with improved resonance control and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910138815.9A CN109856251B (en) | 2019-02-25 | 2019-02-25 | Electromagnetic ultrasonic transducer with improved resonance control and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109856251A CN109856251A (en) | 2019-06-07 |
| CN109856251B true CN109856251B (en) | 2020-04-28 |
Family
ID=66898888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910138815.9A Expired - Fee Related CN109856251B (en) | 2019-02-25 | 2019-02-25 | Electromagnetic ultrasonic transducer with improved resonance control and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109856251B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260506A (en) * | 2019-06-26 | 2019-09-20 | 迪比（重庆）智能科技研究院有限公司 | A kind of constant temperature energy-saving digital i.e. hot water structure and its control method |
| CN110260507B (en) * | 2019-06-26 | 2020-12-25 | 重庆大学 | High-power quasi-resonant electromagnetic induction hot water structure and control method thereof |
| CN110368035B (en) * | 2019-08-30 | 2023-07-07 | 深圳开立生物医疗科技股份有限公司 | Intravascular ultrasound diagnosis system and magnetic driving method |
| CN111134725A (en) * | 2020-02-20 | 2020-05-12 | 重庆智瑞成医疗科技有限公司 | Automatic measuring instrument for palm effusion and effusion depth measuring method |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62287150A (en) * | 1986-06-06 | 1987-12-14 | Mitsubishi Electric Corp | Ultrasonic flaw detecting device |
| CN104901650B (en) * | 2015-05-27 | 2017-12-15 | 北京工业大学 | A kind of impedance-matching device and its implementation of high-power high-frequency driving source |
| US20170290568A1 (en) * | 2016-04-08 | 2017-10-12 | Samsung Medison Co., Ltd. | Ultrasound diagnosis apparatus and method of controlling the ultrasound diagnosis apparatus |
| CN106053614B (en) * | 2016-05-18 | 2018-11-13 | 重庆大学 | The electromagnet ultrasonic changer and its component parameter design method of modified LCL resonance circuits |
| 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 |
-
2019
- 2019-02-25 CN CN201910138815.9A patent/CN109856251B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN109856251A (en) | 2019-06-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109856251B (en) | Electromagnetic ultrasonic transducer with improved resonance control and control method thereof | |
| CA2740777C (en) | System and method of driving ultrasonic transducers | |
| JP6876405B2 (en) | Piezoelectric transducer controllers and methods in which the linear damping characteristics are adaptively adjusted | |
| CN108566114B (en) | Excitation frequency selection method of ultrasonic transducer | |
| CN105717831A (en) | Impedance matching system and method and control system of supersonic power supply | |
| US9604254B2 (en) | Phase track controller improvement to reduce loss of lock occurrence | |
| TWI632353B (en) | Method and circuit arrangement for determining the operating range of an ultrasonic oscillating system | |
| CN103597327A (en) | Method for calculating the oscillation amplitude of a sonotrode | |
| Ramos et al. | Dependence of pulser driving responses on electrical and motional characteristics of NDE ultrasonic probes | |
| Wei et al. | An automatic optimal excitation frequency tracking method based on digital tracking filters for sandwiched piezoelectric transducers used in broken rail detection | |
| CN110542871B (en) | Magnetic characteristic measurement system and method for magnetic material | |
| CN112886850B (en) | Transducer driving system and method | |
| US7245102B1 (en) | Method and system of compensating wave reflections in transmission lines | |
| Dequan et al. | Defects detection system for steel tubes based on electromagnetic acoustic technology | |
| Bargoshadia et al. | Design and manufacture an ultrasonic dispersion system with automatic frequency adjusting property | |
| CN213957246U (en) | Transmitting/receiving device of electromagnetic ultrasonic flaw detection equipment | |
| CN219320396U (en) | Capacitor dynamic frequency ripple current test device | |
| Abbaszadeh et al. | Increasing the efficiency of ultrasonic dispersion system with use of control loop to automatic frequency adjusting | |
| CN217932073U (en) | Ultrasonic circuit, ultrasonic sensor chip and reversing radar device | |
| JP2903781B2 (en) | Ultrasonic transducer drive circuit | |
| JP2019029739A (en) | Ultrasonic vibrator driving device | |
| CN111307956B (en) | Guided wave signal excitation circuit based on linear frequency modulation signal | |
| US11513203B2 (en) | Operating method and control unit for an ultrasound transceiver device, ultrasound transceiver device and working apparatus | |
| US20220311279A1 (en) | Method for operating an acoustic transmission system so as to optimize transmitted power | |
| SU896760A1 (en) | Ultrasonic generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200428 Termination date: 20210225 |