CN101819184A - Pulse ultrasonic wave transmitting circuit - Google Patents

Pulse ultrasonic wave transmitting circuit Download PDF

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Publication number
CN101819184A
CN101819184A CN 201010139346 CN201010139346A CN101819184A CN 101819184 A CN101819184 A CN 101819184A CN 201010139346 CN201010139346 CN 201010139346 CN 201010139346 A CN201010139346 A CN 201010139346A CN 101819184 A CN101819184 A CN 101819184A
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CN
China
Prior art keywords
circuit
pulse
trigger
ultrasonic wave
wave transmitting
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CN 201010139346
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Chinese (zh)
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CN101819184B (en
Inventor
宋寿鹏
刘金鸽
马晓昆
任博
刘运峰
王成
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江苏大学
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Priority to CN2010101393461A priority Critical patent/CN101819184B/en
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Abstract

The invention relates to a pulse ultrasonic wave transmitting circuit which comprises a trigger control module and a pulse generating module, wherein the trigger control module is used for generating a control signal suitable for industrial detection of pulse ultrasonic wave; the pulse generating module consists of a DC power supply, a boost circuit, an impedance matching circuit, an MOS pipe driving unit, a protective circuit and an ultrasonic transducer, and is used for generating high-frequency and high-voltage electric pulse signals for driving the ultrasonic transducer to transmit a pulse ultrasonic signal according to the requirement; the boost circuit is used for further boosting the high-voltage electric pulse signal; the impedance matching circuit is used for improving the load capacity of the circuit so as to improve the pulse ultrasonic wave form; the MOS pipe driving unit is used for lifting a trigger control signal so as to control an MOS pipe to be connected and disconnected; the MOS pipe is used for controlling the charge and discharge frequency; the protective circuit is used for controlling the overhigh current and the charge and discharge directions in a control circuit; and the ultrasonic transducer is used for industrial nondestructive testing, and has the centre frequency within the range of 1-10MHz.

Description

Pulse ultrasonic wave transmitting circuit
Technical field:
The present invention relates to the adjustable pulse ultrasonic wave transmitting circuit of a kind of parameter, this circuit adopts Boost boost principle and impedance match technique, can produce the high pressure driving pulse by low dc voltage, thereby emission pulse ultrasonic, belong to industrial Ultrasonic NDT applied technical field, be used for the occasion that low-voltage DC produces pulse ultrasonic wave, hyperacoustic amplitude, centre frequency and waveform can be adjusted as required.
Background technology:
Ultrasound wave is widely used in industry, field such as agricultural and medical science, and hyperacoustic generation generally needs high voltage pulse de-energisation ultrasonic transducer, the method that produces high voltage pulse at present both at home and abroad mainly contains special chip, DC-DC module and external high pressure module etc., the driving voltage that preceding two kinds of methods produce is generally less, value is at tens volts, too little driving voltage can cause the ultrasonic energy that produces little, in industrial Ultrasonic Detection, can influence hyperacoustic detection degree of depth and detection sensitivity, so general the third method that adopts produces the high voltage pumping signal in industrial Ultrasonic Detection.According to data (Feng Hongliang, Xiao Dingguo, Xu Chun is wide etc., the impulse ultrasound transducer excites/receiving circuit design [J], instrumental technique and transducer, 2003 (11): 30-32) in industrial Ultrasonic NDT, the condenser type radiating circuit is adopted in the generation of pulse ultrasonic wave more, the voltage pulse signal that the excitation ultrasound transducer produces pulse ultrasonic wave mainly boosts to DC voltage and obtains by introducing outside boost module, be about to direct current and convert alternating current earlier to, pass through the transformation link again, voltage is promoted, produce by the capacitor charge and discharge process then and excite the needed potential pulse of transducer.Although this method comparative maturity, realization link is many, causes the circuit complexity, and cost significantly improves, and utilization of power efficient is low, and the bigger deficiency that waits of power consumption requires harsh occasion in array ultrasonic and Embedded Application etc. to power consumption, and it is particularly outstanding that problem seems.Seek low cost, low-power consumption, the solution of reliable and stable work can be brought comprehensive benefit to the development of Ultrasonic Detection undoubtedly.
Summary of the invention:
The ultrasound emission circuit is based on the radiating circuit of inductance among the present invention.Charge and discharge process by inductance element can directly produce high electric field pulse.Insert ultrasonic transducer at correct position, can realize ultrasound emission.Its principle of boosting is the Boost principle of boosting, but traditional Boost booster circuit is bigger to the performance parameter influence of transducer, insert transducer after, the actual effect and unsatisfactory of boosting.The present invention produces link with it as pulse and introduces circuit on research Boost circuit boosts the basis of principle, at its load capacity a little less than, it is bigger that the potential pulse amplitude is influenced by ultrasonic transducer, designed the impedance matching link, improves load capacity.
The technical scheme that realizes the object of the invention is: pulse ultrasonic wave transmitting circuit comprises trigger control module and pulse generation module;
Described trigger control module is made up of trigger end and internal circuit, is used to produce the control signal that is fit to the industrial detection impulse ultrasound;
Described pulse generation module, form by direct supply, Boost booster circuit, impedance matching circuit, metal-oxide-semiconductor driver element, holding circuit and ultrasonic transducer, be used to produce high frequency, high electric field pulse signal to drive ultrasonic transducer emission pulse ultrasonic signal on request; Wherein, described direct supply provides minimum 5V power supply, utilizes low dc voltage can produce high voltage pulse; Described Boost booster circuit is used for the high electric field pulse signal is further boosted; Described impedance matching circuit is used to improve the load capacity of circuit, improves the impulse ultrasound waveform; Described metal-oxide-semiconductor driver element will trigger control signal and draw high, to control the metal-oxide-semiconductor conducting and to end; Described metal-oxide-semiconductor control discharges and recharges frequency; Described holding circuit is used for the excessive electric current of control circuit and discharges and recharges direction; Described ultrasonic transducer is the industrial nondestructive testing ultrasonic transducer, centre frequency at 1MHz between the 10MHz.
Each module in the foregoing circuit mainly comprises:
In the trigger control module, trigger end can comprise external trigger end and internal trigger end, be provided with change-over switch between external trigger end, internal trigger end and the internal circuit, change-over switch is used to select external trigger end or internal trigger end and internal circuit conducting, the external trigger end is selected to import the kind of trigger pip voluntarily by the user, the internal trigger end is by the inner trigger pip that produces of circuit, and the internal trigger signal parameter is adjustable; Be that trigger control module has outside and inner two kinds of trigger modes, outer triggering signal can be selected voluntarily by the user, and the internal trigger signal can be produced by 555 free-running multivibrator circuit, and two kinds of patterns can be by switch SW 0Manual switchover.When adopting external trigger mode, to control by the signal that inserts on the external control pulse input pin, this moment, this signal can be the undersuing that external control modules such as single-chip microcomputer, ARM or DSP produce, thereby satisfied more complicated control flexibly; When adopting the internal trigger pattern, trigger pip is versatile and flexible, and its frequency and dutycycle can be passed through variable resistor RP 0And RP 1Regulate.Trigger control signal through phase inverter N 0After obtain the positive pulse that needs, thereby reach purpose with same cycle repeat its transmission pulse ultrasonic wave.
In the pulse generation module:
Direct supply can adopt minimum 5V power supply, utilizes low dc voltage can produce high voltage pulse, and its DC voltage also can select 30V with interior d. c. voltage signal.
The Boost booster circuit is made up of inductance, electric capacity and resistance, and non-loaded boosting can reach more than the 400V, inserts ultrasonic transducer afterpulse voltage and can reach more than the 100V;
Impedance matching circuit is made of pulse transformer, by changing secondary and the number of primary turns ratio, improves the load capacity of circuit, improves the impulse ultrasound waveform;
The metal-oxide-semiconductor driver element will trigger control signal and draw high, to control the metal-oxide-semiconductor conducting and to end;
Metal-oxide-semiconductor is made of the high speed field effect transistor, and may command discharges and recharges frequency;
Holding circuit is made up of resistance and diode, is used for the excessive electric current of control circuit and discharges and recharges direction;
Ultrasonic transducer is the industrial nondestructive testing ultrasonic transducer, centre frequency at 1MHz between the 10MHz.
The present invention propose based on Boost boost the impulse ultrasound radiating circuit of reason after changing the coupling inductance, can produce centre frequency at 1MHz to pulse ultrasonic wave between the 10MHz, can be used for single transducer transmitting-receiving occasion, also can be used for one the one dual transducers occasion of receiving, the work of can singly popping one's head in also can be formed array way work.
Description of drawings:
Fig. 1 is impulse ultrasound radiating circuit schematic diagram among the present invention;
Fig. 2-1 is a free-running multivibrator in the embodiment of the invention;
Fig. 2-2 is a free-running multivibrator output waveform in the embodiment of the invention;
Fig. 3 produces circuit module for impulse ultrasound among the embodiment among the present invention;
Fig. 4-1 is for inserting ultrasonic transducer load afterpulse voltage waveform 5MHz transducer waveform among the embodiment among the present invention;
Fig. 4-2 is for inserting ultrasonic transducer load afterpulse voltage waveform 5MHz transducer waveform among the embodiment among the present invention;
Fig. 4-3 is for inserting ultrasonic transducer load afterpulse voltage waveform 1MHz transducer waveform among the embodiment among the present invention;
Fig. 4-4 is for inserting ultrasonic transducer load afterpulse voltage waveform 1MHz transducer waveform among the embodiment among the present invention;
Embodiment:
The present invention is further illustrated below in conjunction with accompanying drawing and an embodiment.
The principle of circuit of the present invention as shown in Figure 1, pulse ultrasonic wave transmitting circuit comprises trigger control module and pulse generation module;
Trigger control module, comprise trigger end and internal circuit, trigger end comprises external trigger end and internal trigger end, be provided with change-over switch between external trigger end, internal trigger end and the internal circuit, change-over switch is used to select external trigger end or internal trigger end and internal circuit conducting, the external trigger end selects to import the kind of trigger pip voluntarily by the user, and the internal trigger end is by the inner trigger pip that produces of circuit, and the internal trigger signal parameter is adjustable; Trigger control module is used to produce the control signal that is fit to the industrial detection impulse ultrasound;
The pulse generation module; form by direct supply, Boost booster circuit, impedance matching circuit, metal-oxide-semiconductor driver element, holding circuit and ultrasonic transducer, be used to produce high frequency, high electric field pulse signal to drive ultrasonic transducer emission pulse ultrasonic signal on request.
Further specify as follows:
1. trigger control module triggers control section shown in Fig. 1 double dot dash line left side, and main effect is the positive pulse that produces certain width, behind the metal-oxide-semiconductor driver element, as Q 0Gate drive signal V g, be used to control Q 0The break-make of the drain-source utmost point.Among the figure, SW 0Be single-pole double-throw switch (SPDT), being used to select emissioning controling signal is to be provided or imported by the outside by circuit inside; Not gate N 0With the control wave of sending into anti-phase after, be transformed to positive pulse and send into N-channel MOS switch Q 0And driver element, be used to control Q 0The break-make of the drain-source utmost point.
The invention provides two kinds of pulse control modes, pass through SW 0Realize function selecting.Work as SW 0When selecting 555 free-running multivibrators, shown in Fig. 2-1, by suitable adjusting, at not gate N 0Input end is with obtaining a series of negative pulses with certain width that repeat with some cycles, shown in Fig. 2-2, through N 0The anti-phase positive pulse that needs of can obtaining, thus reach purpose with the ultrasonic pulse signal of same cycle repeat its transmission.
Wherein,
Tw≈0.7RP 1C t,T≈0.7(RP 0+RP 1)C t (1)
Under this mode, circuit need not introduced external control signal, utilizes 555 inner free-running multivibrators can realize the periodic transmission of ultrasonic pulse.
Work as SW 0When selecting external control pulse input, the emission of ultrasonic pulse will no longer be subjected to the influence of 555 free-running multivibrators, and be controlled by the signal that inserts on the external control pulse input pin.This moment, this signal can be the undersuing that external control modules such as single-chip microcomputer, ARM or DSP produce, thereby satisfied more complicated control flexibly.
2. pulse generation module, pulse produce part shown in double dot dash line right side among Fig. 1, and main effect is to produce the high electric field pulse that meets the demands.Its circuit structure is developed by the Boost booster circuit, and the voltage signal V at power taking sense L two ends LAs output.Circuit is carried out transient analysis be not difficult to release V LResponse function.In the practical application, generally require impedance matching link and ultrasonic transducer T XEquiva lent impedance much larger than the impedance at inductance L two ends.For the ease of observing and analyzing, the existing circuit structure of pulse generation part among Fig. 1 is extracted shown as Fig. 3.
R among the figure 0Be current-limiting resistance, flow through the size of current of inductance when being used to control induction charging, the purpose of doing like this is: can protect inductance not burnt by big electric current on the one hand; On the other hand, by regulating R 0Size, can control the size of the electric current that flows through inductance, and then control exomonental amplitude; Get R L>>R 0High back-pressure fast diode D 0Effect be the influence of offsetting diode in the body of metal-oxide-semiconductor inside, make it invalid.Work as V gDuring the end high level, Q 0The conducting of the drain-source utmost point, R LWith C by short circuit, initial current i is arranged in the coil 0Flow through V L=0.
Work as V gWhen end is changed to low level, Q 0The drain-source utmost point is by moment, because self-induction will stop the electric current downward trend, electric current remains unchanged in the coil.Enter the transient response process afterwards.Following transient state equation is arranged
LCR Li″+(R LR 0C+L)i′+(R L+R 0)i=Vs (2)
Original state is
i ( t ) | t = 0 = i 0 V C ( t ) | t = 0 = 0 - - - ( 3 )
Desire to make circuit working under mode of oscillation, at this moment, secular equation has two conjugate complexs several.Solve an equation in this case, can obtain
V L=-LVs(α 22)exp(αt)sin(βt)/(βR 0) (4)
In the formula,
α = - 1 2 ( R 0 L + 1 CR L ) , β = 1 2 4 LC - ( R 0 L - 1 CR L ) 2
Among the present invention, get
R 0<<R L 4 LC > 10 ( R 0 L - 1 CR L ) 2 , Have
α 2 + β 2 = 1 LC ( 1 + R 0 R L ) ≈ 1 LC , β = 1 2 4 LC - ( R 0 L - 1 CR L ) 2 ≈ 1 LC
Get V thus LRough estimation equation
V L ≈ - Vs R 0 L C exp ( αt ) sin 1 LC t - - - ( 5 )
Note Centre frequency for excitation pulse; Amplitude for pulse.
Pulse produces the main tuning pulse that produces a series of by exponential damping of part.
3. impedance matching because the load capacity of pulse shown in Figure 3 generation part is limited, directly inserts transducer, and the amplitude that pulse will be produced sharply descends, and centre frequency moves down, thereby has greatly limited the usable range of circuit, does not have too big practicality.In the invention process, once be that 5MHz ultrasonic transducer 5Z10N is that example is observed comparison with the centre frequency, before the discovery transducer inserts, the about 300V of pulse height, and after inserting, pulse height has only not enough 30V; Use the ultrasonic transducer of 1MHz instead, the pulse center frequency is displaced downwardly near the 300KHz.
In order to reduce the influence of load (transducer) to ultrasonic generating unit parallel circuit, improve the load capacity of circuit, between has been introduced pulse transformer as the impedance matching link.
If transformer time elementary ratio is n/m, the equivalent resistance of load is designated as R t, it is converted elementary resistance and is designated as R ' t, following relation is then arranged
n m = R t R t ′ - - - ( 6 )
Choose suitable primary and secondary coil ratio by test of many times, thereby improve the circuit load ability, improve transmitting pulse waveform.
In order to observe the actual effect of circuit working, chosen the set of circuits parameter, and be that example experimentizes with the ultrasonic transducer 5Z10N of centre frequency 5MHz and the transducer of 1MHz respectively.Experiment condition is: circuit working is about to the output of 555 free-running multivibrators and chooses T as control signal in the internal trigger control mode w=40us, T=1ms; V s=5V; Adopt IR2110 as the field effect transistor chip for driving; Choose IRF630B as quick MOS switch; Choose 1N4148 as D 0L=470 μ H; Pulse transformer time elementary ratio
R 0Transfer to 10 Ω, record the voltage V at transducer two ends 0Show as Fig. 4-1 and Fig. 4-2.
As can be seen from Figure, the nearly 50V of 5MHz transducer two ends output pulse amplitude, harmonic frequency is near 5MHz.The about 80V of 1MHz transducer two ends output pulse amplitude, harmonic frequency is near 1MHz.
At a certain section of waveform, harmonic amplitude is not strict presses the index law decay, but slight rise is arranged, and this is because the diode D that chooses 0Junction capacity less than metal-oxide-semiconductor Q 0The drain-source interelectrode capacity due to.Therefore when selecting diode for use, require its junction capacity greater than and as far as possible near the metal-oxide-semiconductor Q that chooses 0The drain-source interelectrode capacity, the waveform of circuit output can be better like this.
Regulate R 0To 5 Ω, transducer two ends waveform is as Fig. 4-3, shown in Fig. 4-4.
As seen from the figure, the nearly 70V of 5MHz transducer two ends output pulse amplitude, harmonic frequency is near 5MHz.The about 110V of 1MHz transducer two ends output pulse amplitude, harmonic frequency is near 1MHz.
Observe the digital display window of D.C. regulated power supply duty, average current has only 30mA, and circuit power consumption is lower.
Impulse ultrasound radiating circuit in this invention has compact conformation, and control is flexible, and easy to adjust (emissive power is adjustable, the pulse center frequency adjustable, the emission adjustable repetitive frequency), cost is low, the photoelectric transformation efficiency height, amplitude is big under the unit energy consumption situation, is fit to very much advantages such as Embedded Application occasion.
When circuit parameter is chosen,, should note choosing suitable components and parts, especially as Q for meeting the requirements of waveform 0, D 0, L, key componentses such as C; The number of turn for pulse transformer is chosen, and combining with theoretical analysis and test of many times, determines optimum matching.
Boost capability based on the radiating circuit of inductance is outstanding, so its load capacity a little less than, its output waveform is subject to the parameter influence of load (ultrasonic transducer).At this deficiency, invention is introduced pulse transformer as the impedance matching link, and circuit is carried out impedance matching, has improved the circuit load ability, makes it have suitable practicality.

Claims (9)

1. pulse ultrasonic wave transmitting circuit is characterized in that, this pulse ultrasonic wave transmitting circuit comprises trigger control module and pulse generation module;
Described trigger control module is made up of trigger end and internal circuit, and trigger control module is used to produce the control signal that is fit to the industrial detection impulse ultrasound;
Described pulse generation module, form by direct supply, Boost booster circuit, impedance matching circuit, metal-oxide-semiconductor driver element, holding circuit and ultrasonic transducer, be used to produce high frequency, high electric field pulse signal to drive ultrasonic transducer emission pulse ultrasonic signal on request; Wherein, described direct supply provides minimum 5V power supply, utilizes low dc voltage can produce high voltage pulse; Described Boost booster circuit is used for the high electric field pulse signal is further boosted; Described impedance matching circuit is used to improve the load capacity of circuit, improves the impulse ultrasound waveform; Described metal-oxide-semiconductor driver element will trigger control signal and draw high, to control the metal-oxide-semiconductor conducting and to end; Described metal-oxide-semiconductor control discharges and recharges frequency; Described holding circuit is used for the excessive electric current of control circuit and discharges and recharges direction; Described ultrasonic transducer is the industrial nondestructive testing ultrasonic transducer, centre frequency at 1MHz between the 10MHz.
2. pulse ultrasonic wave transmitting circuit according to claim 1, it is characterized in that, described trigger end comprises external trigger end and internal trigger end, be provided with change-over switch between external trigger end, internal trigger end and the internal circuit, change-over switch is used to select external trigger end or internal trigger end and internal circuit conducting, the external trigger end selects to import the kind of trigger pip voluntarily by the user, and the internal trigger end is by the inner trigger pip that produces of circuit, and the internal trigger signal parameter is adjustable.
3. pulse ultrasonic wave transmitting circuit according to claim 1 is characterized in that, described internal circuit is phase inverter (N0).
4. pulse ultrasonic wave transmitting circuit according to claim 1 is characterized in that described direct supply provides the d. c. voltage signal of 5V~30V.
5. pulse ultrasonic wave transmitting circuit according to claim 1 is characterized in that, described Boost booster circuit is made up of inductance, electric capacity and resistance.
6. pulse ultrasonic wave transmitting circuit according to claim 1 is characterized in that described impedance matching circuit is made of pulse transformer, by changing secondary and the number of primary turns ratio, improves the load capacity of circuit, improves the impulse ultrasound waveform.
7. pulse ultrasonic wave transmitting circuit according to claim 1 is characterized in that, described metal-oxide-semiconductor driver element is made of the high speed field effect transistor, and control discharges and recharges frequency.
8. pulse ultrasonic wave transmitting circuit according to claim 1 is characterized in that described holding circuit is made up of resistance and diode, is used for the excessive electric current of control circuit and discharges and recharges direction.
9. pulse ultrasonic wave transmitting circuit according to claim 1 is characterized in that, described internal trigger end is 555 free-running multivibrator circuit.
CN2010101393461A 2010-04-01 2010-04-01 Pulse ultrasonic wave transmitting circuit CN101819184B (en)

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Cited By (14)

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Publication number Priority date Publication date Assignee Title
CN102322905A (en) * 2011-05-24 2012-01-18 国网电力科学研究院 Transducer driving circuit of ultrasonic flow meter
CN102621237A (en) * 2012-03-12 2012-08-01 河海大学常州校区 High-power single-pulse ultrasonic signal generator and nondestructive inspection method thereof
CN102636307A (en) * 2012-04-10 2012-08-15 交通运输部公路科学研究所 Effective stress level test device and method of vertical prestressed reinforcement
CN102836811A (en) * 2012-07-30 2012-12-26 西安思坦仪器股份有限公司 Stimulating method and stimulating circuit for piezoelectric ceramic transducer
CN102890929A (en) * 2011-07-19 2013-01-23 中国科学院声学研究所 Array type electromagnetic pulse sound source
CN103532524A (en) * 2013-09-27 2014-01-22 南京航空航天大学 Pulse radio signal generating and transmitting system and control method of system
CN103630288A (en) * 2013-11-28 2014-03-12 江苏大学 Ultrasonic recycling triggered pressure measuring device and method
CN103746674A (en) * 2013-12-25 2014-04-23 北京长峰广播通讯设备有限责任公司 Method and apparatus for generating self-excited oscillation type electronic tube grid modulation pulse
CN103983695A (en) * 2014-05-30 2014-08-13 北京智博联科技有限公司 Wireless nonmetal ultrasonic detecting system
CN104034810A (en) * 2014-06-19 2014-09-10 中航复合材料有限责任公司 Ultrasonic-acoustic emission excitation method for detecting composite material
CN104485927A (en) * 2014-12-31 2015-04-01 深圳先进技术研究院 Excitation device for ultrasonic sensor array
CN104624459A (en) * 2015-01-10 2015-05-20 肖国选 Ultrasonic wave emitting circuit
CN104767503A (en) * 2015-04-23 2015-07-08 江苏博克斯自动化控制工程有限公司 Ultrasonic wave controllable pulse wave-making drive circuit and drive method thereof
CN105973997A (en) * 2016-04-28 2016-09-28 长沙金码高科技实业有限公司 Ultrasonic transceiver

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Publication number Priority date Publication date Assignee Title
CN102322905A (en) * 2011-05-24 2012-01-18 国网电力科学研究院 Transducer driving circuit of ultrasonic flow meter
CN102322905B (en) * 2011-05-24 2013-04-10 国网电力科学研究院 Transducer driving circuit of ultrasonic flow meter
CN102890929B (en) * 2011-07-19 2014-07-09 中国科学院声学研究所 Array type electromagnetic pulse sound source
CN102890929A (en) * 2011-07-19 2013-01-23 中国科学院声学研究所 Array type electromagnetic pulse sound source
CN102621237A (en) * 2012-03-12 2012-08-01 河海大学常州校区 High-power single-pulse ultrasonic signal generator and nondestructive inspection method thereof
CN102636307A (en) * 2012-04-10 2012-08-15 交通运输部公路科学研究所 Effective stress level test device and method of vertical prestressed reinforcement
CN102836811A (en) * 2012-07-30 2012-12-26 西安思坦仪器股份有限公司 Stimulating method and stimulating circuit for piezoelectric ceramic transducer
CN103532524A (en) * 2013-09-27 2014-01-22 南京航空航天大学 Pulse radio signal generating and transmitting system and control method of system
CN103532524B (en) * 2013-09-27 2017-04-12 南京航空航天大学 Pulse radio signal generating and transmitting system and control method of system
CN103630288A (en) * 2013-11-28 2014-03-12 江苏大学 Ultrasonic recycling triggered pressure measuring device and method
CN103746674B (en) * 2013-12-25 2017-01-11 北京长峰广播通讯设备有限责任公司 Method and apparatus for generating self-excited oscillation type electronic tube grid modulation pulse
CN103746674A (en) * 2013-12-25 2014-04-23 北京长峰广播通讯设备有限责任公司 Method and apparatus for generating self-excited oscillation type electronic tube grid modulation pulse
CN103983695A (en) * 2014-05-30 2014-08-13 北京智博联科技有限公司 Wireless nonmetal ultrasonic detecting system
CN104034810A (en) * 2014-06-19 2014-09-10 中航复合材料有限责任公司 Ultrasonic-acoustic emission excitation method for detecting composite material
CN104485927B (en) * 2014-12-31 2018-05-11 深圳先进技术研究院 The exciting bank of array of ultrasonic sensors
CN104485927A (en) * 2014-12-31 2015-04-01 深圳先进技术研究院 Excitation device for ultrasonic sensor array
CN104624459A (en) * 2015-01-10 2015-05-20 肖国选 Ultrasonic wave emitting circuit
CN104767503A (en) * 2015-04-23 2015-07-08 江苏博克斯自动化控制工程有限公司 Ultrasonic wave controllable pulse wave-making drive circuit and drive method thereof
CN104767503B (en) * 2015-04-23 2017-05-10 江苏博克斯自动化控制工程有限公司 Ultrasonic wave controllable pulse wave-making drive circuit and drive method thereof
CN105973997A (en) * 2016-04-28 2016-09-28 长沙金码高科技实业有限公司 Ultrasonic transceiver

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