CN1016285B - Ultrasound detecting head and pulse generator - Google Patents
Ultrasound detecting head and pulse generatorInfo
- Publication number
- CN1016285B CN1016285B CN 88109995 CN88109995A CN1016285B CN 1016285 B CN1016285 B CN 1016285B CN 88109995 CN88109995 CN 88109995 CN 88109995 A CN88109995 A CN 88109995A CN 1016285 B CN1016285 B CN 1016285B
- Authority
- CN
- China
- Prior art keywords
- pulse
- way
- ultrasonic probe
- power amplifier
- circuit
- 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
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The present invention discloses a novel ultrasonic probe (ultrasonic transducer) which belongs to the technical field of ultrasonic sounding. The structure of a traditional ultrasonic probe and an electric excitation mode are altered, a novel pulse power source is adopted to generate two-way dipulses to actuate a piezoelectric ceramic sheet, the phase difference of the two-way dipulses is adjusted to eliminate complementary waves, and a traditional backing damping method is eliminated or the backing damping is alleviated. Compared with the existing backing damping probe, the novel ultrasonic probe has a high sensitivity under the same selectivity condition, and the sensitivity and selectivity are easy to control. The novel ultrasonic probe has the advantages of simplified structural design, saved tungsten powder and epoxy resin backings, and simplified technology, and the novel pulse power source which has two-way adjustable phases has the advantages of simplicity, stabilization and reliability. The novel ultrasonic probe can be widely used for the technical field of industrial detection, medical care, etc.
Description
Novel ultrasonic probe (also claiming ultrasonic transducer) belongs to the supersonic sounding field.
Supersonic sounding is the important detection technique in fields such as industry and medical treatment, its ultrasonic probe is a critical piece, basic demand to probe is that sufficiently high sensitivity and selectivity (resolution) piezo ceramic element as ultrasonic transducer will be arranged, encourage with electric pulse, produce vibration, for reaching the detection requirement, must eliminate the remained shock ripple.The method that extensively adopts is the method for machinery coupling at present, promptly adds damping block in the piezoelectric ceramic piece rear surface.Damping block normally adopts the potpourri of epoxy resin and tungsten powder, by changing the proportioning of epoxy resin and tungsten powder, makes its acoustic impedance approach the acoustic impedance of piezoelectric ceramic piece, promptly so-called high damping backing structure.With the unidirectional pulse excitation, allow the high damping piece that the repercussions of piezoelectric transducer are sponged, thereby it is little to obtain the vibration repercussions; The ultrasonic probe that resolution is high.But this method cost is very big, because of the also simultaneously a large amount of losses in damping block of ultrasonic pulse wave energy, the amplitude of its main crest reduces greatly, and probe sensitivity descends, and because sensitivity and optionally contradiction bring difficulty for the structural design and the manufacturing process of popping one's head in.Thereby this mechanical matching process is actually not really desirable.
The objective of the invention is to make a kind of do not have the backing damping or alleviate the backing damping structure and highly sensitive, that selectivity is good novel ultrasonic transducer and develop a kind of simple, stable, be applicable to the pulse power of this novel ultrasonic probe of excitation reliably.
Design of the present invention has changed traditional employing high damping backing structure and electric excitation mode, adopt the novel two-way double pulse excitation piezoelectric ceramic piece that the pulse power produced, with the method for adjusting phase differential between two-way dipulse, the vibration repercussions that twice excitation produced of positive and negative pulse are cancelled each other, reach the elimination repercussions, and make the vibration main peak unattenuated, thereby removed traditional backing damped method or alleviated the backing damping, and obtained highly sensitive, the good novel ultrasonic probe of selectivity (resolution).
The novel pulse power of the present invention is mainly by impulse source, delay circuit, the parameter regulation circuit, and power amplifier and pulse synthesizer are formed.Divide two-way to arrive pulse synthesizer by the pulse that impulse source produced, one the tunnel through parameter regulation, direct input pulse compositor behind the power amplifier, another Lu Xianjing delay circuit, again through parameter regulation, input pulse compositor behind the power amplifier is then by the two-way dipulse electric wave excitation of pulse synthesizer output single channel piezoelectric ceramic piece.The perhaps train of impulses that produces by impulse source.Behind parametric circuit, divide two-way again, one road train of impulses directly enters the power amplifier group, and another road enters the power amplifier group again behind delay circuit, parameter regulation circuit, then by a plurality of piezoelectric ceramic pieces of the power amplifier group output two-way double pulse excitation of multichannel.The purpose of developing this impulse source is to make an electrical pulse source can drive ultrasonic transducer as much as possible, is convenient to as the focus ultrasonic driving power.
Ultrasonic probe of the present invention is compared with the backing probe is arranged, under same selectivity situation, high sensitivity is arranged, simplified the structural design of probe, save tungsten powder, epoxy resin backing, its work simplification, probe sensitivity and selectivity ratios are easier to regulate, simple, stable, the reliable and adjustable novel pulse power of bidirectional pulse phase place of its pulse power.
Accompanying drawing of the present invention is as follows:
Accompanying drawing 1 two-way dipulse obtains the little ultrasound wave schematic diagram of repercussions.
The two-way dual-pulse power supply logic diagram of accompanying drawing 2 single channel.
The two-way dipulse circuit of accompanying drawing 3 multichannels The general frame.
Accompanying drawing 4 circuit power discharging principle figure.
Accompanying drawing 5 pulse-generating circuits.
Principle that present invention will be described in detail with reference to the accompanying and embodiment
Accompanying drawing 1 ultrasound wave for adopting two-way double pulse excitation piezo ceramic element to be obtained is about to the unimodal pulse that impulse source will produce and divides two-way to arrive at ultrasonic probe, and one the tunnel is through, and another road is through the anti-phase back arrival ultrasonic probe of delaying time.Except that the first valley overlaid, all the other amplitudes equate and phase place is opposite at the ultrasound wave that produces in the load in the two-way pulse like this, cancel out each other, thereby obtain the ultrasound wave that sound pulse is unimodal and little repercussions.(a)-direct impulse excitation among Fig. 1, (b)-the negative-going pulse excitation, (c)-two-way double pulse excitation.
In the two-way dual-pulse power supply logic diagram of single channel shown in the accompanying drawing 2, the pulse of being sent by impulse source (1) divides two-way to arrive pulse synthesizer (7), one the tunnel behind parameter regulation circuit (2) and power amplifier (3), direct pulse compositor (7), another Lu Xianjing delay circuit (4), arrive pulse synthesizer (7) through parameter regulation circuit (5) and power amplifier (6) again, encourage piezoelectric ceramic piece by the two-way dipulse of pulse synthesizer (7) output single channel again.The two-way pulse reaches the pulsewidth of regulating two-way dipulse respectively through the governing loop of parameter regulation circuit, phase differential, and parameters such as cycle make it the two-way dipulse that obtains to meet the demands.
Accompanying drawing 3 is The general frame of an embodiment of the two-way dual-pulse power supply of multichannel.The impulse source of present embodiment is multivibrator (1).Train of impulses by multivibrator (1) generation, behind the train of impulses that obtains to meet the demands through monostable circuit (2) and parameter regulation circuit (3), be divided into two-way again, one the tunnel directly enters power amplifier group (6) (present embodiment is four power amplifier groups), this road is called the A series impulse, another road enters four power amplifier groups (6) through delay circuit (4) and parameter regulation circuit (5) afterwards again, and this road is called the B series impulse.The pulse synthesis is also played in four existing power amplification effects of power amplifier group, and when the A string, when the B series impulse is worked simultaneously, the four tunnel are output as the two-way dipulse electrical waveform of strict synchronism.When having only A series impulse work, the four tunnel are output as synchronous unidirectional pulse waveform.
Among the power discharging principle figure of accompanying drawing 4, the C point is A series impulse input, and the D point is B series impulse input.Power amplifier is made up of two tunnel symmetrical fully secondary switch circuit.BG
1, BG
2Be elementary power amplifier switch pipe, it amplifies the A of C, 2 inputs of D string, B series impulse, anti-phase after, through R
3And C
2Be added to field effect transistor FET
1, FET
2Grid get on (present embodiment adopt field effect transistor be) in order to improve the load-carrying ability of rising edge of a pulse speed and circuit, by FET
1, FET
2After further amplifying, the output pulse of having amplified in A, B point acquisition.When two-way dipulse was worked, piezoelectric transducer connect A, B 2 points, and when unidirectional pulse was exported, piezoelectric transducer connect the A point.
Pulse-generating circuit shown in the accompanying drawing 5 is multi-resonant oscillating circuit (1).The circuit theory diagrams of single-shot trigger trigger (2) and pulse delay circuit (3).W among the figure
1, C
1, C
2Be used for regulating the oscillation period of multivibrator, to reach the purpose of regulating last output stage two-way dipulse repetition period T.W
2With W
4Be used for regulating pulse width monostable, circuit, thereby reach positive and negative in the two-way dipulse output of adjusting to pulse width τ
1With τ
2Purpose.W
3, C
5, C
6Be used for regulating the delay inequality of B series impulse with respect to the A series impulse.
The present invention has changed the structural design of traditional ultrasonic probe, has improved sensitivity and resolution, has reduced cost, can release the spy sound of novel use and visit point, will be widely used in fields such as industry detection and medical treatment.
Claims (2)
1, a kind of ultrasonic probe that adopts electric excitation mode is characterized in that not having the damping backing or has little damping backing, by adopting bidirectional pulse power supply excitation piezoelectric element.Adjust this bidirectional pulse phase differential, the vibration repercussions that twice excitation produced of positive and negative pulse are cancelled each other; Main peak is not attenuated so that eliminate repercussions.
2, a kind of pulse power supply circuit that is used to encourage the described ultrasonic probe of claim 1, comprise impulse source, power amplifier, it is characterized in that also comprising delay circuit, parameter regulation circuit and pulse synthesizer, divide two-way to arrive pulse synthesizer by the pulse that impulse source produced, one the tunnel through the parameter regulation circuit, direct input pulse compositor behind the power amplifier, another Lu Xianjing delay circuit, again through the parameter regulation circuit, input pulse compositor behind the power amplifier, then by the two-way dipulse electric wave excitation of pulse synthesizer output single channel piezoelectric ceramic piece, the perhaps train of impulses that is produced by impulse source is behind parametric circuit, divide two-way again, one road train of impulses directly enters the power amplifier group, and another road is through delay circuit, behind the parameter regulation circuit, enter the power amplifier group again, then by a plurality of piezoelectric ceramic pieces of the power amplifier group output two-way double pulse excitation of multichannel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88109995 CN1016285B (en) | 1988-11-20 | 1988-11-20 | Ultrasound detecting head and pulse generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88109995 CN1016285B (en) | 1988-11-20 | 1988-11-20 | Ultrasound detecting head and pulse generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1043201A CN1043201A (en) | 1990-06-20 |
| CN1016285B true CN1016285B (en) | 1992-04-15 |
Family
ID=4835504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88109995 Expired CN1016285B (en) | 1988-11-20 | 1988-11-20 | Ultrasound detecting head and pulse generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1016285B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070189761A1 (en) * | 2003-12-04 | 2007-08-16 | Wojtek Sudol | Implementing ic mounted sensor with high attenutation backing |
| CN102185591A (en) * | 2011-03-01 | 2011-09-14 | 株洲南车时代电气股份有限公司 | Gate pulse generation device for testing power device of current transformation module |
| KR102295378B1 (en) * | 2017-06-16 | 2021-08-31 | 지멘스 메디컬 솔루션즈 유에스에이, 인크. | Method and ultrasound system for forming ultrasound signal of ultrasound probe |
| CN110619764B (en) * | 2018-06-19 | 2021-08-17 | 上海汽车集团股份有限公司 | Method and device for detecting obstacle |
| CN117564434B (en) * | 2024-01-15 | 2024-04-30 | 钛玛科（北京）工业科技有限公司 | Ultrasonic double-roll welding device and method |
-
1988
- 1988-11-20 CN CN 88109995 patent/CN1016285B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1043201A (en) | 1990-06-20 |
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