CN104154961A - Emission device and method capable of reducing work blind areas of ultrasonic energy converter - Google Patents
Emission device and method capable of reducing work blind areas of ultrasonic energy converter Download PDFInfo
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- CN104154961A CN104154961A CN201410386630.7A CN201410386630A CN104154961A CN 104154961 A CN104154961 A CN 104154961A CN 201410386630 A CN201410386630 A CN 201410386630A CN 104154961 A CN104154961 A CN 104154961A
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Abstract
The invention discloses an emission device and method capable of reducing work blind areas of an ultrasonic energy converter. The emission device capable of reducing the work blind areas of the ultrasonic energy converter comprises a control module, a push-pull circuit module and the energy converter, wherein the control module is connected with the push-pull circuit module and used for sending control signals to the push-pull circuit module; the push-pull circuit module is connected with the energy converter and used for sending pulse drive signals to drive the energy converter to generate ultrasonic waves; the control module is further connected with the energy converter, and used for determining distances to be measured according to time difference of time when the ultrasonic signals are sent by the energy converter and time when corresponding echo signals are received and sending the control signals to the push-pull circuit module according to the distances to be measured. Accordingly, work states of the energy converter can be dynamically adjusted through the ultrasonic emission device, the energy converter is quickly driven or attenuated, and the work blind areas of the ultrasonic energy converter are reduced.
Description
Technical field
The present invention relates to supersonic technique field, particularly relate to a kind of emitter and method that reduces ultrasonic transducer work blind area.
Background technology
Along with the continuous expansion application of ultrasonic technique, ultrasonic technique is widely used in the every field such as medical science, industry.By ultrasound wave, realize flow monitoring, liquid level detects, and oil level monitoring also reaches its maturity, and has the advantages such as measuring accuracy is high, broad quantum, good reliability.When utilizing ultrasound wave to carry out flow and object position measurement, use electric pulse excitation ultrasound wave transducer, make it send ultrasonic excitation signal, ultrasonic signal is at Propagation, run into different interfaces (interface of Ru Shui, oil and air) and be reflected back transducer, the ultrasonic signal returning is referred to as echoed signal, utilizes the travel-time of ultrasonic excitation signal and ultrasonic echo signal to carry out flow or object position measurement.
Yet ultrasonic transducer work blind area is by ultrasound wave, to realize the obstacle of flow monitoring or position probing.Electric impulse signal causes transducer internal energy conversion element and produces same frequency resonance, thus excitation ultrasound ripple excitation signal.But when exciting after electric pulse disappears, residual ability owing to exciting, ultrasonic internal energy conversion component will sustained vibration (free damping vibration), until rudimental energy runs out of.If reach when ultrasonic transducer aftershock amplitude is still greater than the amplitude peak of ultrasonic echo signal, ultrasonic echo signal will be submerged, and None-identified makes to measure unsuccessfully.The first mate who generally ultrasonic transducer free damping starting of oscillation to aftershock amplitude is decreased to ultrasonic echo signal is worth time while equating and is referred to as the work blind area of ultrasonic transducer.
Number of patent application is that the document of CN201210238866 discloses a kind of method that reduces ultrasonic transducer work blind area of controlling based on aftershock energy, it realizes elimination aftershock energy by connecting capacitor and inductor form hardware, in the method, in hardware, each element can not be adjusted, and cannot be applicable to the work blind area of different ultrasonic transducers.
Therefore, how can not change on the basis of hardware connection, dynamically adjust transducer, thereby reduce ultrasonic transducer work blind area, become the problem that those skilled in the art need solution badly.
Summary of the invention
The ultrasonic transmission device and the method that the object of this invention is to provide a kind of dynamic adjustment transducer, dynamically adjust the duty of transducer, and fast driving or decay transducer, reduce ultrasonic transducer work blind area.
For solving the problems of the technologies described above, the invention provides a kind of emitter that reduces ultrasonic transducer work blind area, comprise control module, push-pull circuit module and transducer, control module connects push-pull circuit module, be used for transmitting control signal to push-pull circuit module, push-pull circuit module connects transducer, for transmitted drive transducer, produces ultrasound wave; Described control module is also connected with described transducer, for sending ultrasonic signal according to transducer and mistiming of receiving between corresponding echoed signal is determined the size of testing distance, and send control signal to push-pull circuit module according to the size of described testing distance.
Preferably, the described emitter that reduces ultrasonic transducer work blind area also comprises impedance matching module, impedance matching module is connected with described control module, transducer, and the impedance matching control signal that described impedance matching module can be sent according to control module is adjusted direct impedance size.
Preferably, described control module is sent control signal and is comprised driving pulse phase place, driving pulse width and drive three parameters of gap periods, makes push-pull circuit module send pulse drive signal by predetermined order.
Preferably, described control module is controlled push-pull circuit module and is produced periodically successively forward narrow pulse signal, forward wide pulse signal and anti-phase narrow pulse signal.
Preferably, described push-pull circuit module adopts triode two-stage push pull mode.
Preferably, described impedance matching circuit comprises: three branch roads in parallel, wherein on the first branch road, be provided with phase locked frequency discriminate module, and on the second branch road, be provided with adjustable capacitive reactance module, on the 3rd branch road, be provided with the first electric capacity.
Preferably, described impedance matching circuit also comprises the filtering circuit being arranged between described adjustable capacitive reactance module and described the first electric capacity, and described filtering circuit comprises the second electric capacity and resistance in parallel.
The present invention also provides a kind of method that reduces ultrasonic transducer work blind area, comprising: control module transmits control signal to push-pull circuit module; Push-pull circuit module produces pulse drive signal according to control signal and drives transducer to produce ultrasound wave; According to transducer, send ultrasonic signal and receive mistiming between corresponding echoed signal and determine the size of testing distance, control module is sent control signal to push-pull circuit module according to the size of described testing distance.
Preferably, described control signal, for comprising driving pulse phase place, driving pulse width and driving three parameters of gap periods, makes push-pull circuit module send pulse drive signal by predetermined order.
Preferably, described control module is also sent impedance matching control signal according to the size of described testing distance; Impedance matching circuit is adjusted direct impedance size according to described impedance matching control signal.
A kind of emitter that reduces ultrasonic transducer work blind area provided by the invention and method are according to actual measurement distance, control module is adjusted control signal, make push-pull circuit module 2 send pulse drive signal by predetermined order and drive transducer, reduce the work blind area of ultrasonic transducer.Control module 1 is adjusted and is driven driving pulse phase place, the driving pulse width of signal and drive gap periods by push-pull circuit module 2, dynamically adjusts the duty of transducer, fast driving or decay transducer.
Accompanying drawing explanation
Fig. 1 is a kind of the first embodiment theory diagram that reduces the emitter of ultrasonic transducer work blind area provided by the invention;
Fig. 2 is the control signal pulse excitation waveform schematic diagram relatively of the generation of pulse excitation waveform and a kind of emitter that reduces ultrasonic transducer work blind area provided by the invention in prior art;
Fig. 3 be in prior art transducer aftershock frequency decay with the middle transducer aftershock frequency attenuation ratio of a kind of emitter that reduces ultrasonic transducer work blind area provided by the invention compared with schematic diagram;
Fig. 4 is a kind of the second embodiment theory diagram that reduces the emitter of ultrasonic transducer work blind area provided by the invention;
Fig. 5 is the circuit structure diagram of a kind of push-pull circuit module provided by the invention;
Fig. 6 is the circuit structure diagram of a kind of impedance matching module provided by the invention;
Fig. 7 is a kind of process flow diagram that reduces ultrasonic transducer work blind area method of the present invention.
Embodiment
In order to make those skilled in the art person understand better technical scheme of the present invention, below in conjunction with accompanying drawing, the present invention is described in further detail.
Referring to Fig. 1, Fig. 1 is a kind of the first embodiment theory diagram that reduces the emitter of ultrasonic transducer work blind area provided by the invention.
The invention provides a kind of ultrasonic transmission device, comprise control module 1, push-pull circuit module 2 and transducer 3, control module 1 connects push-pull circuit module 2, be used for transmitting control signal to push-pull circuit module 2, push-pull circuit module 2 connects transducer 3, for transmitted drive transducer 3, produces ultrasound wave; Described control module 1 is also connected with described transducer 3, for sending ultrasonic signal according to transducer 3 and mistiming of receiving between corresponding echoed signal is determined the size of testing distance, and send control signal to push-pull circuit module 2 according to the size of described testing distance.
Referring to Fig. 2 and Fig. 3, Fig. 2 is the control signal pulse excitation waveform schematic diagram relatively of the generation of pulse excitation waveform and a kind of emitter that reduces ultrasonic transducer work blind area provided by the invention in prior art; Fig. 3 be in prior art transducer aftershock frequency decay with the middle transducer aftershock frequency attenuation ratio of a kind of emitter that reduces ultrasonic transducer work blind area provided by the invention compared with schematic diagram.
Specifically as shown in Fig. 2 a and Fig. 3 a, in general, in prior art, send continuously isopulse width, etc. drive equidirectional several control signal pulsed drive ultrasonic transducers work of gap periods, ultrasonic transducer produces longer aftershock, if the less work blind area that inevitably exists of measuring distance.For solving the problems of the technologies described above, control module 1 can be after powering on first, by push-pull circuit module 2, drive transducer 3 to produce ultrasound wave, and according to transducer 3, send ultrasonic signal and receive mistiming between corresponding echoed signal and determine the size of testing distance, and adjust driving pulse phase place, the driving pulse width of control signal and drive three parameters of gap periods according to the size of described testing distance, make push-pull circuit module 2 send pulse drive signal by predetermined order.By control module 1, adjust driving pulse phase place, the driving pulse width of control signal and drive gap periods, can realize the duty of dynamic adjustment transducer 3, fast driving or decay transducer.
In further scheme, specifically, as shown in Fig. 2 b and Fig. 3 b, control module 1 is controlled push-pull circuit module 2 and is produced periodically successively forward narrow pulse signal, forward wide pulse signal and anti-phase narrow pulse signal.Be that control module 1 first sends forward narrow pulse signal driving transducer 3 resonance by push-pull circuit module 2, then utilize forward wide pulse signal to drive transducer 3 work, after surveying work, control module 1 sends anti-phase narrow pulse signal by push-pull circuit module 2 and drives transducer 3, the artificial transducer of decay fast, transducer aftershock signal descending slope strengthens, and aftershock signal time is shorter, and transducer aftershock decays rapidly.
Referring to Fig. 4, Fig. 4 is a kind of the second embodiment theory diagram that reduces the emitter of ultrasonic transducer work blind area provided by the invention.
The difference of the second embodiment and the first embodiment is, described control module 1 is also for sending impedance matching control signal according to the size of described testing distance.Described a kind of emitter that reduces ultrasonic transducer work blind area also comprises impedance matching module 4, impedance matching module 4 is connected with described control module 1, transducer 3, the impedance matching control signal that described impedance matching module 4 can be sent according to control module 1 is adjusted direct impedance size, and then adjusts the resonance size of described ultrasonic transducer 3 (it can be equivalent to inductance-resistance-capacitance oscillatory circuit); Described impedance matching control signal for the impedance of controlling described impedance matching module 4 along with the change of described testing distance is large and become large, correspondingly the resonance of described ultrasonic transducer 3 also becomes large, and reduce along with reducing of described testing distance for controlling the impedance of described impedance matching module 4, correspondingly the resonance of described ultrasonic transducer 3 also diminishes.By when recognizing testing distance and approach blind area scope, gate impedance matching module 4, the impedance of coupling ultrasonic transducer, the fast aftershock of decay probe.
Referring to Fig. 5, Fig. 5 is the circuit structure diagram of a kind of push-pull circuit module provided by the invention.
As shown in Figure 5, push-pull circuit module 3 adopts triode two-stage push pull mode.Control module 1 transmits control signal to push-pull circuit module 2, and control signal is selected to flow to through bi-directional thyristor switch element and driven loop one or drive loop two.When device powers on first, control signal is through driving loop one to produce direct impulse signal driver ultrasonic transducer, transducer sends ultrasonic signal and receives mistiming between corresponding echoed signal determines the size of testing distance, and control module is sent control signal to push-pull circuit module according to the size of described testing distance.When testing distance more in short-term control module to push-pull circuit module, send control signal, through driving loop one to produce forward narrow pulse signal, drive transducer resonance, then the control signal that control module is sent drives transducer work through driving loop one to produce forward wide pulse signal, after surveying work, control module is sent control signal and is driven transducer through driving loop two to produce anti-phase narrow pulse signal, the artificial transducer of decay fast.Fig. 5 is the particular circuit configurations figure of push-pull circuit module, and its mechanism and principle, with the same described in push-pull circuit module 2 in above-described embodiment, repeat no more.
Referring to Fig. 6, the circuit structure diagram that Fig. 6 is a kind of impedance matching module provided by the invention.
Impedance matching module comprises: three branch roads in parallel, are wherein provided with on the first branch road on phase locked frequency discriminate module 31, the second branch roads and are provided with on adjustable capacitive reactance module 32, the three branch roads and are provided with the first capacitor C 1; This ultrasonic transducer 3 is equivalent to the series arm of capacitor C 3 and resistance R 3.In addition, adjusting selecting is joined electronic switch and is controlled gate impedance matching module, from the hardware aspect probe aftershock that decays fast.
Referring to Fig. 7, Fig. 7 is a kind of process flow diagram that reduces ultrasonic transducer work blind area method of the present invention.
The described ultrasonic transducer work blind area method that reduces comprises:
S71 control module transmits control signal to push-pull circuit module;
S72 push-pull circuit module produces pulse drive signal according to control signal and drives transducer to produce ultrasound wave;
S73 sends ultrasonic signal according to transducer and receives mistiming between corresponding echoed signal and determines the size of testing distance;
S74 control module is sent control signal to push-pull circuit module according to the size of described testing distance.
Preferably, described control signal is for comprising driving pulse phase place, driving pulse width and driving three parameters of gap periods.
S75 push-pull circuit module, according to control signal, is adjusted pulse drive signal.
In the present embodiment by control module according to the big or small adjustment control signal of testing distance, change dynamically the duty of transducer, fast driving or decay transducer, make transducer Aftershock attenuation faster, reduce the work blind area of ultrasonic transducer.
In further scheme, the described ultrasonic transducer work blind area method that reduces also comprises:
S76 sends impedance matching control signal;
S77 impedance matching module is adjusted direct impedance size.
Impedance matching module is adjusted direct impedance size according to described impedance matching control signal, and then adjusts the resonance size of described ultrasonic transducer; Described impedance matching control signal, and reduces along with reducing of described testing distance for controlling the impedance of described impedance matching module along with the change of described testing distance is large and become large for the impedance of controlling described impedance matching module.Thereby the impedance of coupling ultrasonic transducer, the fast aftershock of decay probe.
Above a kind of emitter and method that reduces ultrasonic transducer work blind area provided by the present invention is described in detail.Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand core concept of the present invention.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. an emitter that reduces ultrasonic transducer work blind area, it is characterized in that, comprise control module, push-pull circuit module and transducer, control module connects push-pull circuit module, be used for transmitting control signal to push-pull circuit module, push-pull circuit module connects transducer, for transmitted drive transducer, produces ultrasound wave; Described control module is also connected with described transducer, for sending ultrasonic signal according to transducer and mistiming of receiving between corresponding echoed signal is determined the size of testing distance, and send control signal to push-pull circuit module according to the size of described testing distance.
2. the emitter that reduces ultrasonic transducer work blind area according to claim 1, it is characterized in that, also comprise impedance matching module, impedance matching module is connected with described control module, transducer, and the impedance matching control signal that described impedance matching module can be sent according to control module is adjusted direct impedance size.
3. the emitter that reduces ultrasonic transducer work blind area according to claim 1, it is characterized in that, described control module is sent control signal and is comprised driving pulse phase place, driving pulse width and drive three parameters of gap periods, makes push-pull circuit module send pulse drive signal by predetermined order.
4. the emitter that reduces ultrasonic transducer work blind area according to claim 3, is characterized in that, described control module is controlled push-pull circuit module and produced periodically successively forward narrow pulse signal, forward wide pulse signal and anti-phase narrow pulse signal.
5. according to the emitter that reduces ultrasonic transducer work blind area described in claim 1 to 6 any one, it is characterized in that, described push-pull circuit module adopts triode two-stage push pull mode.
6. the emitter that reduces ultrasonic transducer work blind area according to claim 2, it is characterized in that, described impedance matching circuit comprises: three branch roads in parallel, wherein on the first branch road, be provided with phase locked frequency discriminate module, on the second branch road, be provided with adjustable capacitive reactance module, on the 3rd branch road, be provided with the first electric capacity.
7. the emitter that reduces ultrasonic transducer work blind area according to claim 8, it is characterized in that, also comprise the filtering circuit being arranged between described adjustable capacitive reactance module and described the first electric capacity, described filtering circuit comprises the second electric capacity and resistance in parallel.
8. a method that reduces ultrasonic transducer work blind area, is characterized in that, comprising:
Control module transmits control signal to push-pull circuit module;
Push-pull circuit module produces pulse drive signal according to control signal and drives transducer to produce ultrasound wave;
According to transducer, send ultrasonic signal and receive mistiming between corresponding echoed signal and determine the size of testing distance, control module is sent control signal to push-pull circuit module according to the size of described testing distance.
9. the method that reduces ultrasonic transducer work blind area according to claim 8, it is characterized in that, described control signal, for comprising driving pulse phase place, driving pulse width and driving three parameters of gap periods, makes push-pull circuit module send pulse drive signal by predetermined order.
10. the method that reduces ultrasonic transducer work blind area according to claim 8 or claim 9, is characterized in that, described control module is also sent impedance matching control signal according to the size of described testing distance;
Impedance matching circuit is adjusted direct impedance size according to described impedance matching control signal.
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| CN201410386630.7A CN104154961B (en) | 2014-08-07 | 2014-08-07 | A kind of emitter and method reducing ultrasonic transducer work blind area |
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| CN201410386630.7A CN104154961B (en) | 2014-08-07 | 2014-08-07 | A kind of emitter and method reducing ultrasonic transducer work blind area |
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Cited By (5)
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| CN105954539A (en) * | 2016-07-11 | 2016-09-21 | 南京世海声学科技有限公司 | Method for reducing ADCP transducer blind area |
| CN106871980A (en) * | 2017-02-13 | 2017-06-20 | 合肥工业大学 | The excitation of gas ultrasonic flowmeter batch (-type) and signal processing method and system based on adjacent peak maximum difference |
| CN109589134A (en) * | 2019-01-29 | 2019-04-09 | 河南省中医院（河南中医药大学第二附属医院） | Ultrasonic radiography auxiliary monitoring device |
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| CN112504395A (en) * | 2020-11-30 | 2021-03-16 | 中建八局轨道交通建设有限公司 | Receiving and transmitting integrated ultrasonic oil level gauge |
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| CN112504395A (en) * | 2020-11-30 | 2021-03-16 | 中建八局轨道交通建设有限公司 | Receiving and transmitting integrated ultrasonic oil level gauge |
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Denomination of invention: Emission device and method capable of reducing work blind areas of ultrasonic energy converter Effective date of registration: 20181227 Granted publication date: 20180918 Pledgee: Business Department of Hunan Branch of China Construction Bank Co., Ltd. Pledgor: Hunan Sany Intelligent Control Equipment Co., Ltd. Registration number: 2018430000146 |
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