CN102279044A - Method for automatically collimating hydrophone in ultrasonic sound filed measurement - Google Patents
Method for automatically collimating hydrophone in ultrasonic sound filed measurement Download PDFInfo
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- CN102279044A CN102279044A CN 201110112244 CN201110112244A CN102279044A CN 102279044 A CN102279044 A CN 102279044A CN 201110112244 CN201110112244 CN 201110112244 CN 201110112244 A CN201110112244 A CN 201110112244A CN 102279044 A CN102279044 A CN 102279044A
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Abstract
The invention provides a method for automatically collimating a hydrophone and a sound axis in the sound field measurement of an ultrasonic transducer. When the axial sound pressure of the transducer is measured by utilizing the hydrophone, the axial directions of the transducer and the hydrophone are collimated, thereby enabling the geometric axis of the transducer and the receiving direction axis of the hydrophone to be coincided; and a method for collimating visual signals by utilizing adjustment is generally adopted. The method provided by the invention is extremely sensitive to the radial off-axis position according to edge waves received by the hydrophone on the surface of the transducer, can realize accurate collimation of the sound axis through the amplitude of the edge waves and can realize the automatic collimation of the hydrophone and the sound axis by combining the corresponding control system and collimation criteria.
Description
One, technical field
The present invention is to provide a kind of in the ultrasonic transducer acoustic field nautical receiving set and the autocollimating method of acoustic axis.The edge wave that the nearly transducer face nautical receiving set of foundation receives can be realized accurately collimating automatically of nautical receiving set and acoustic axis to radially off-axis position is very responsive by the amplitude criterion of edge wave and in conjunction with the control corresponding system.
Two, technical background
In with nautical receiving set measurement transducer sound field process, before nautical receiving set places tested transducer, its reception directive property need and transducer beam axis are to collimation, this process in nearly all transducer acoustic field measurement standard all with " make nautical receiving set axially and transducer axes to being in a straight line " simplified summary, in fact this adjustment process is generally manual carries out, and its collimation principle also is to make that the nautical receiving set received signal is the strongest.This process not only wastes time and energy but also be not easy accurately, acoustic beam for broad, nautical receiving set is departing from acoustic axis very during small distance, its waveforms amplitude is compared with amplitude on the beam axis and is changed also not quite, be not easy to judge that by vision whether this signal is " the strongest " signal, often brings no small error to measurement.
Three, summary of the invention
The objective of the invention is in order to overcome when nautical receiving set is measured the ultrasonic transducer sound field, the deficiency that nautical receiving set and acoustic axis alignment methods exist, and a kind of nautical receiving set alignment method based on transducer near field edge wave peak value is provided, for the accurate measurement of transducer acoustic field provides theoretical support.
The object of the present invention is achieved like this: analyzing theoretically, is example with the circular transducer, when analyzing its pulse sound field usually, all introduces the notion of plane wave and edge wave.Plane wave is the sound wave that is produced when looking the ultrasonic transducer radiating surface for infinity, and being finiteness by actual ultrasonic transducer radiating surface, edge wave caused, the two separates in time, and the time interval of separating decides on the measurement point position, and the two opposite in sign.In the column region of radiating surface, what at first arrive measurement point is plane wave, after this is only edge wave, then has only edge wave to exist before the radiating surface outside the cylindricality zone.In the far field of transducer, these two kinds of ripples mutual superposition on time domain can't be distinguished, but in the transducer near field, plane wave can separate fully with edge wave.Edge wave is the amplitude maximum only on the transducer beam axis time, and very responsive to off-axis position.So amplitude that can be by this edge wave also realizes the accurate aligning of acoustic axis in conjunction with the control corresponding system.
Four, description of drawings
Fig. 1 is the transducer volume coordinate;
Fig. 2 is a transducer sound radiation pressure time domain waveform in different distance place on the axis that calculates;
Fig. 3 be calculate apart from transducer face 5mm place different from wheelbase from last time domain waveform;
Fig. 4 be the difference of 0.2mm nautical receiving set experiment measuring from wheelbase from last time domain waveform;
Fig. 5 is a nautical receiving set autocollimation process control flow;
Five, embodiment
For a more detailed description to the present invention for example below in conjunction with accompanying drawing:
In conjunction with Fig. 1, be depicted as the volume coordinate setting among the present invention, be initial point with the aperture center of tested transducer, vertical with transducer face and what point to the acoustic beam transmit direction is the Z axle;
In conjunction with Fig. 2, be depicted as transducer sound radiation pressure time domain waveform in different distance place on the axis that calculates.Wherein first wave group is a direct wave among (a) figure, and second wave group is an edge wave.These two kinds of ripples mutual superposition on time domain can't be distinguished when far away apart from transducer face as can be seen from (b) figure, but in the transducer near field, plane wave can separate fully with edge wave.
In conjunction with Fig. 3, when being positioned on the beam axis (x=0mm) then and there, the through wave amplitude gap in edge wave amplitude and plane is little, but along with from wheelbase from continuous expansion edge wave decay rapidly, when edge wave has decayed on the axis during from 0.3mm from wheelbase about 10%.Amplitude maximum when as seen edge wave is only on the transducer beam axis, but the amplitude transformation of the plane direct wave of this moment is little, that is to say, and with respect to plane wave, edge wave is responsive more for off-axis position.This is the theoretical foundation of this autocollimation method just.
In conjunction with Fig. 4, in order to verify the feasibility of this method, provided the experimental measurements of nautical receiving set, measurement result and theoretical analysis are in full accord, the edge wave that nearly transducer face nautical receiving set receives can be realized the accurate aligning of acoustic axis by the amplitude of this edge wave to radially off-axis position is very responsive.Utilize this principle just can realize the autocollimation of nautical receiving set, also need the setting on the hardware and software certainly, can realize by software program module for motion control arithmetic.
In conjunction with Fig. 5, the control flow of alignment procedure is divided into coarse scan and accurately scans two steps, and the purpose of coarse scan is the general location of locating acoustic axis fast, less scanning step pitch is set then carries out fine scanning.In the fine scanning process, need not to carry out two-dimensional scan, only need radially carry out scanning on the Z-axis and get final product, for example X-axis and Y-axis at two of transducer.Accurately scanning process need be carried out the calculating of waveform character value in real time, follows the tracks of the change situation of second wave group (edge wave) amplitude, finds out the peak of two scan axis coboundary ripples, and this position promptly is the real center of acoustic axis.
Claims (5)
1. nautical receiving set and the autocollimating method of acoustic axis in a ultrasonic transducer acoustic field.It is characterized in that: the edge wave that the nearly transducer face nautical receiving set of foundation receives can be realized accurately collimating automatically of nautical receiving set and acoustic axis to radially off-axis position is very responsive by the amplitude criterion of edge wave and in conjunction with the control corresponding system.
2. method according to claim 1 is characterized in that, in the far field of transducer, these two kinds of ripples mutual superposition on time domain can't be distinguished, but in the transducer near field, plane wave can separate fully with edge wave.
3. method according to claim 1 is characterized in that: edge wave is the amplitude maximum only on the transducer beam axis time, but the amplitude transformation of the plane direct wave of this moment is little, and edge wave is responsive more for off-axis position.
4. method according to claim 3 is characterized in that: by the amplitude variation of edge wave and the accurate aligning of realizing acoustic axis in conjunction with the control corresponding system, can realize by control flow for motion control arithmetic.
5. method according to claim 4 is characterized in that: control flow is divided into coarse scan and accurately scans two steps, and the purpose of coarse scan is the general location of locating acoustic axis fast, less scanning step pitch is set then carries out fine scanning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110112244 CN102279044A (en) | 2011-05-03 | 2011-05-03 | Method for automatically collimating hydrophone in ultrasonic sound filed measurement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110112244 CN102279044A (en) | 2011-05-03 | 2011-05-03 | Method for automatically collimating hydrophone in ultrasonic sound filed measurement |
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| CN102279044A true CN102279044A (en) | 2011-12-14 |
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| CN 201110112244 Pending CN102279044A (en) | 2011-05-03 | 2011-05-03 | Method for automatically collimating hydrophone in ultrasonic sound filed measurement |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140777A (en) * | 2015-09-11 | 2015-12-09 | 武汉理工光科股份有限公司 | Control method and system for output wavelength of widely tunable semiconductor laser |
| CN109520612A (en) * | 2018-11-13 | 2019-03-26 | 上海交通大学 | The burnt system and method for the quick survey of the practical sound field of immersion type focused transducer |
| CN110559013A (en) * | 2019-07-17 | 2019-12-13 | 聚融医疗科技(杭州)有限公司 | Method and system for automatically testing ultrasonic sound field |
| CN110726470A (en) * | 2019-11-04 | 2020-01-24 | 河北工业大学 | High-precision three-dimensional sound field measuring system of medical ultrasonic equipment |
| CN113008354A (en) * | 2021-02-25 | 2021-06-22 | 西安邮电大学 | Manual sound axis alignment method for ultrasonic sound field measurement system |
| CN113188650A (en) * | 2021-03-11 | 2021-07-30 | 聚融医疗科技(杭州)有限公司 | Method and system for measuring parallelism of mechanical axis and acoustic beam collimation axis of sound field |
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| US4441503A (en) * | 1982-01-18 | 1984-04-10 | General Electric Company | Collimation of ultrasonic linear array transducer |
| CN1453562A (en) * | 2003-05-29 | 2003-11-05 | 上海交通大学 | Output measuring system for medical ultrasonic equipment |
| CN101398328A (en) * | 2008-10-28 | 2009-04-01 | 北京理工大学 | Automatic measurement mechanism for ultrasonic liquid-dipping transducer acoustic field |
| CN101936770A (en) * | 2010-08-27 | 2011-01-05 | 上海交通大学 | Measuring system of high-intensity focusing ultrasonic sound field |
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2011
- 2011-05-03 CN CN 201110112244 patent/CN102279044A/en active Pending
Patent Citations (4)
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| US4441503A (en) * | 1982-01-18 | 1984-04-10 | General Electric Company | Collimation of ultrasonic linear array transducer |
| CN1453562A (en) * | 2003-05-29 | 2003-11-05 | 上海交通大学 | Output measuring system for medical ultrasonic equipment |
| CN101398328A (en) * | 2008-10-28 | 2009-04-01 | 北京理工大学 | Automatic measurement mechanism for ultrasonic liquid-dipping transducer acoustic field |
| CN101936770A (en) * | 2010-08-27 | 2011-01-05 | 上海交通大学 | Measuring system of high-intensity focusing ultrasonic sound field |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140777A (en) * | 2015-09-11 | 2015-12-09 | 武汉理工光科股份有限公司 | Control method and system for output wavelength of widely tunable semiconductor laser |
| CN105140777B (en) * | 2015-09-11 | 2019-07-23 | 武汉理工光科股份有限公司 | Width tunable semiconductor laser output wavelength control method and system |
| CN109520612A (en) * | 2018-11-13 | 2019-03-26 | 上海交通大学 | The burnt system and method for the quick survey of the practical sound field of immersion type focused transducer |
| CN110559013A (en) * | 2019-07-17 | 2019-12-13 | 聚融医疗科技(杭州)有限公司 | Method and system for automatically testing ultrasonic sound field |
| CN110726470A (en) * | 2019-11-04 | 2020-01-24 | 河北工业大学 | High-precision three-dimensional sound field measuring system of medical ultrasonic equipment |
| CN110726470B (en) * | 2019-11-04 | 2021-07-20 | 河北工业大学 | High-precision three-dimensional sound field measuring system of medical ultrasonic equipment |
| CN113008354A (en) * | 2021-02-25 | 2021-06-22 | 西安邮电大学 | Manual sound axis alignment method for ultrasonic sound field measurement system |
| CN113008354B (en) * | 2021-02-25 | 2022-01-04 | 西安邮电大学 | Manual sound axis alignment method for ultrasonic sound field measurement system |
| WO2022179325A1 (en) * | 2021-02-25 | 2022-09-01 | 西安邮电大学 | Manual acoustic axis alignment method for ultrasonic acoustic field measurement system |
| CN113188650A (en) * | 2021-03-11 | 2021-07-30 | 聚融医疗科技(杭州)有限公司 | Method and system for measuring parallelism of mechanical axis and acoustic beam collimation axis of sound field |
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Application publication date: 20111214 |