CN102175767B - Electromagnetic ultrasonic signal superposition method - Google Patents
Electromagnetic ultrasonic signal superposition method Download PDFInfo
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- CN102175767B CN102175767B CN 201010623162 CN201010623162A CN102175767B CN 102175767 B CN102175767 B CN 102175767B CN 201010623162 CN201010623162 CN 201010623162 CN 201010623162 A CN201010623162 A CN 201010623162A CN 102175767 B CN102175767 B CN 102175767B
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Abstract
本发明公开了一种电磁超声信号叠加方法。所述电磁超声探伤方法包括按预定的时间间隔顺序地将具有相同脉冲长度的脉冲电压串提供给多个发射线圈，以产生多个超声波信号；多个接收线圈接收所述多个超声波的回波信号；对与接收到的多个回波信号相应的多个电压信号进行移相，以使所述多个电压信号相位相同；将进行相移处理的多个电压信号进行叠加。根据本发明提供的电磁超声探伤方法，将通过多个接收线圈接收的具有预定相位差的超声波的回波信号进行移相并叠加，增加了信号幅度，从而改善了信噪比。
The invention discloses an electromagnetic ultrasonic signal superposition method. The electromagnetic ultrasonic flaw detection method includes sequentially providing pulse voltage trains with the same pulse length to multiple transmitting coils at predetermined time intervals to generate multiple ultrasonic signals; multiple receiving coils receive the echoes of the multiple ultrasonic waves signal; phase-shifting multiple voltage signals corresponding to multiple received echo signals, so that the phases of the multiple voltage signals are the same; superimposing the multiple voltage signals subjected to phase-shift processing. According to the electromagnetic ultrasonic flaw detection method provided by the present invention, the echo signals of ultrasonic waves with a predetermined phase difference received by multiple receiving coils are phase-shifted and superimposed to increase the signal amplitude, thereby improving the signal-to-noise ratio.
Description
Technical field
The present invention relates to a kind of electromagnetic supersonic flaw detecting method, more particularly, relate to a kind of electromagnetic supersonic flaw detecting method based on the signal stack.
Background technology
Electromagnetic supersonic flaw detecting is an emerging ultrasonic detection technology.The magnetizing coil (transmitting coil) that is connected with high-frequency pulse current is placed on the electrically-conducting metal surface of measurand, it is identical that the action of alternating magnetic field that coil produces goes out frequency in measurand superficial layer internal induction, the eddy current of opposite direction, this eddy current is produced by moving charging point, this eddy current be applied to simultaneously stationary magnetic field in another place of measurand (as, permanent magnet or DC electromagnet produce) interact, when the charging point in measurand flows in magnetic field, be subject to being subjected to displacement perpendicular to the effect of power-Lorentz lorentz (Lorentz) power of magnetic direction and particle movement direction, the volume element vibration-generating that eddy current is entered, thereby inspire the ultrasound wave identical with frequencies of eddy currents are, formed ultrasonic source, a minute force direction (horizontal component and vertical component) of regarding as firmly can inspire compressional wave and shear wave simultaneously.
When ultrasound wave is propagated in measurand, if reflect while running into the different object of acoustic impedance, utilize eddy current coil (receiving coil) to receive this reflection wave, by measuring the travel-time of this ultrasound wave in object, just can calculate one-tenth-value thickness 1/10 and/or the defect position of testee.
Receiving ultrasound wave is the inverse process that produces hyperacoustic process, be that ultrasonic reflection echo in measurand causes particle to vibrate in stationary magnetic field, will produce induction current, making to be configured in the lip-deep magnetic test coil of measurand has induced potential to produce, can be used as the reception signal, its frequency has identical frequency with the ultrasound wave received, and its size increases with the increase in magnetic field.
With traditional piezoelectric supersonic wave technology, compare, the electromagnetic supersonic flaw detecting technology has advantages of does not need to use couplant.Yet the sound-electric conversion efficiency of electromagnetic ultrasonic wave is lower, cause the ultrasonic signal that transmits and receives all a little less than, requiring the detection sensitivity high field close or grown while detecting apart from guided wave, the signal to noise ratio (S/N ratio) of flaw detection is lower.
Summary of the invention
To be partly articulated in the following description the other aspect of the present invention and/or advantage, by describing, it can become clearer, or can understand by implementing the present invention.
According to embodiments of the invention, a kind of electromagnetic ultrasonic signal superposition method is provided, described method comprises: the pulse voltage string that will have same pulse length by predetermined time intervening sequences ground offers a plurality of transmitting coils, to produce a plurality of ultrasonic signals; A plurality of receiving coils receive described a plurality of hyperacoustic echoed signals; The corresponding a plurality of voltage signals of a plurality of echoed signals with receiving are carried out to phase shift, so that described a plurality of voltage signal phase place is identical; A plurality of voltage signals that will carry out phase-shift processing are superposeed.
In addition, described pulse voltage string is the square-wave signal string.
In addition, control the connection status of transmitting coil and current source by described pulse voltage string, to transmitting coil, provide pulse current.
In addition, described a plurality of pulse voltage string is to cut apart continuous pulse voltage signal by the length by identical to produce.
In addition, a plurality of hyperacoustic echoed signal a plurality of receiving coils received carries out carrying out phase-shift processing after preposition amplification.
According to the present invention, a plurality of transmitting coils by time interval received pulse electric current produce ultrasound wave (, and receive and there is hyperacoustic echoed signal of phase differential and carry out the phase shift processing by a plurality of receiving coils, after eliminating phase differential, superposeed again, thereby increased signal amplitude, therefore reached the purpose that improves signal to noise ratio (S/N ratio).
The accompanying drawing explanation
By the description of embodiment being carried out below in conjunction with accompanying drawing, these and/or other aspect of the present invention and advantage will become clear and be easier to and understand, wherein:
Fig. 1 is the block diagram according to the emission part of the electromagnetic flaw detection device of the embodiment of the present invention;
Fig. 2 is the block diagram according to the acceptance division of the electromagnetic flaw detection device of the embodiment of the present invention;
Fig. 3 is the process flow diagram according to the electromagnetic test method of the embodiment of the present invention;
Fig. 4 and Fig. 5 are the schematic diagram that hyperacoustic echo that the train of impulses that receives according to the transmitting coil of the embodiment of the present invention and receiving coil receive is shown respectively.
Embodiment
Now the embodiment of the present invention is described in detail, its example shown in the accompanying drawings.Below with reference to the accompanying drawings embodiment is described to explain the present invention.
Comprise emission part and acceptance division according to the electromagnetic ultrasonic defect detection device of the embodiment of the present invention, emission part is for generation of ultrasound wave, and defective locations and/or thickness that acceptance division is used for receiving hyperacoustic echo and judges test material according to echo.
Fig. 1 is the block diagram according to the emission part of the electromagnetic ultrasonic defect detection device of the embodiment of the present invention.Comprise transponder pulse control system 10, the 1st driving circuit 20-1 to the N driving circuit 20-N and the 1st transmitting coil 30-1 to the N transmitting coil 30-N according to the emission part of the electromagnetic ultrasonic defect detection device of the embodiment of the present invention.
Transponder pulse control system 10 can produce the multichannel transponder pulse and control their output timing.Transponder pulse control system 10 can receive continuous pulse voltage signal (for example, square-wave signal) and control the sequential that pulse voltage signal is offered to driving circuit (or transmitting coil).
For example, transponder pulse control system 10 only offers pulse voltage signal the 1st driving circuit 20-1 during very first time section, pulse voltage signal is only offered to the 2nd driving circuit 20-2 during the second time period, ..., during the N time period, pulse voltage signal is only offered to N driving circuit 20-N.At this, very first time section, the second time period ...., the length of N time period is identical.Like this, what each receiving coil received will be the pulse voltage string, and can not be continuous pulse voltage signal.And, very first time section is identical with the mistiming between the second time period and the 3rd time with the mistiming between the second time period, the second time period is identical with the mistiming between the 3rd time period and the 4th time period with the mistiming between the 3rd time period, the like.
As mentioned above, transponder pulse control system 10 can be cut apart continuous pulse voltage signal by the length by identical and produces the pulse voltage string.Transponder pulse control system 10 can by the pulse voltage string of generation by predetermined time intervening sequences offer the 1st driving circuit 20-1 to the N driving circuit 20-N.
The 1st driving circuit 20-1 to the N driving circuit 20-N is according to the pulse voltage string received, and driving switch pipe (not shown) is connected to the current source (not shown) by transmitting coil, thus transmitting coil received pulse electric current.Differ between the pulse voltage string received due to driving circuit that the schedule time is poor and length each pulse voltage string is identical, therefore, it is poor that the pulse current that transmitting coil receives also has the schedule time.
At this, can be directly the pulse voltage string from 10 outputs of transponder pulse control system be offered to transmitting coil, with for generation of ultrasound wave.
The 1st transmitting coil 30-1 to the N transmitting coil 30-N produces ultrasonic signal according to the pulse current (pulse voltage string) received in the measurand (not shown).
Now, the frequency of the pulse current (or pulse voltage) of accepting due to the 1st transmitting coil 30-1 to the N transmitting coil 30-N is identical, and therefore, hyperacoustic frequency of generation is also identical.In addition, it is poor that the pulse current (or pulse voltage) received due to the 1st transmitting coil 30-1 to the N transmitting coil 30-N has the schedule time, and therefore, the ultrasound wave of its generation has predetermined phase differential.That is, the ultrasound wave produced by the 1st transmitting coil 30-1 to the N transmitting coil 30-N has identical frequency, and has predetermined phase differential.
Fig. 2 is the block diagram according to the acceptance division of the electromagnetic ultrasonic defect detection device of the embodiment of the present invention.
Comprise electric discharge road 50-N and phase shift supercircuit before the 1st receiving coil 40-1 to the N receiving coil 40-N, the 1st front electric discharge road 50-1 to the N according to the acceptance division of the electromagnetic ultrasonic defect detection device of the embodiment of the present invention.
The 1st receiving coil 40-1 to the N receiving coil 40-N receives hyperacoustic echoed signal.At this, i receiving coil 40-i receives hyperacoustic echoed signal of i transmitting coil 30-i emission, wherein, i=1,2 ...., N.
The frequency of the ultrasonic signal produced due to the 1st transmitting coil 30-1 to the N transmitting coil 30-N is identical and have a predetermined phase differential, the frequency of hyperacoustic echoed signal that therefore, the 1st receiving coil 40-1 to the N receiving coil 40-N receives is identical and have a predetermined phase differential.At this, the phase differential between the ultrasound wave that the phase differential between the ultrasonic echo signal that receiving coil receives produces with transmitting coil is identical.The frequency of the voltage signal therefore, produced at receiving coil is identical and have an identical phase differential.
The voltage at the receiving coil two ends that hyperacoustic echoed signal that before the 1st front electric discharge road 50-1 to the N, electric discharge road 50-N will receive with receiving coil is corresponding is amplified.
Fig. 3 is the process flow diagram according to the electromagnetic supersonic flaw detecting method of the embodiment of the present invention.
In step 301, interval will have the pulse voltage string of mistiming and sequentially offer a plurality of transmitting coils on schedule, to produce a plurality of ultrasound waves.
At this, the connection status that can control a plurality of transmitting coils and current source by the pulse voltage string provides pulse current to transmitting coil.
In step 302, a plurality of receiving coils receive hyperacoustic echoed signal that a plurality of transmitting coils produce.
In step 303, a plurality of voltage signals corresponding with a plurality of hyperacoustic echoed signals are amplified;
In step 304, the voltage signal of a plurality of amplifications is carried out to the phase shift processing, carry out the signal stack after eliminating phase differential, thus the amplitude of increase signal.
According to the present invention, a plurality of transmitting coils produce ultrasound wave (as shown in Figure 4) by time interval received pulse electric current, and receive and there is hyperacoustic echoed signal of phase differential and carry out the phase shift processing by a plurality of receiving coils, after eliminating phase differential, superposeed again (as shown in Figure 5), thereby increased signal amplitude, therefore reached the purpose that improves signal to noise ratio (S/N ratio).
Although meaned and described some embodiments of the present invention, having it should be appreciated by those skilled in the art that and can modify to these embodiment in the situation that do not break away from principle of the present invention and the spirit that is limited its scope by claim and equivalent thereof.
Claims (5)
1. an electromagnetic ultrasonic signal superposition method, is characterized in that, comprising:
The pulse voltage string that will have same pulse length by predetermined time intervening sequences ground offers a plurality of transmitting coils, to produce a plurality of ultrasonic signals;
A plurality of receiving coils receive described a plurality of hyperacoustic echoed signals;
The corresponding a plurality of voltage signals of a plurality of echoed signals with receiving are carried out to phase shift, so that described a plurality of voltage signal phase place is identical;
A plurality of voltage signals that will carry out the phase shift processing are superposeed.
2. the method for claim 1, wherein described pulse voltage string is the square-wave signal string.
3. the method for claim 1, wherein by described pulse voltage string, control the connection status of transmitting coil and current source, to transmitting coil, provide pulse current.
4. the method for claim 1, wherein described pulse voltage string is to cut apart continuous pulse voltage signal by the length by identical to produce.
5. a plurality of hyperacoustic echoed signal the method for claim 1, wherein a plurality of receiving coils received carries out carrying out phase-shift processing after preposition amplification.
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| CN 201010623162 CN102175767B (en) | 2010-12-30 | 2010-12-30 | Electromagnetic ultrasonic signal superposition method |
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| CN 201010623162 CN102175767B (en) | 2010-12-30 | 2010-12-30 | Electromagnetic ultrasonic signal superposition method |
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| CN102175767B true CN102175767B (en) | 2013-12-25 |
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| CN105675731B (en) * | 2016-01-18 | 2018-07-03 | 钢研纳克检测技术股份有限公司 | Array is the same as hair, the detection signal enhancing method with receipts ultrasonic probe |
| CN106568847A (en) * | 2016-11-14 | 2017-04-19 | 哈尔滨零声科技有限公司 | Multicoil ultrasonic guided-wave device of arbitrary frequency, and guided wave excitation method and receiving method thereof |
| CN108613646B (en) * | 2018-05-28 | 2019-08-06 | 新疆维吾尔自治区特种设备检验研究院 | Array electromagnetic ultrasonic resonance probe and method for metal thickness measurement on rough surface |
| CN112326782B (en) * | 2020-11-06 | 2022-06-21 | 爱德森（厦门）电子有限公司 | A kind of eddy current and acoustic impedance detection sensor and its making method |
| CN113866262B (en) * | 2021-10-02 | 2025-03-21 | 爱德森（厦门）电子有限公司 | A method and device for improving eddy current detection rate |
| CN116973982A (en) * | 2023-06-30 | 2023-10-31 | 广东花至美容科技有限公司 | Electromagnetic signal processing method and device and electromagnetic positioning system |
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| CN201229172Y (en) * | 2008-05-23 | 2009-04-29 | 北京工业大学 | Electromagnetical supersonic transducer for detecting ferromagnetic pipe |
| CN101710103A (en) * | 2009-11-27 | 2010-05-19 | 华中科技大学 | Unidirectional testing method of magnetostrictive guided waves |
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| JP2838812B2 (en) * | 1990-09-05 | 1998-12-16 | 富士通株式会社 | Ultrasonic transducer drive system |
| JPH1010099A (en) * | 1996-06-25 | 1998-01-16 | Ishikawajima Harima Heavy Ind Co Ltd | Ultrasonic flaw detector noise eliminator |
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| JP2006242770A (en) * | 2005-03-03 | 2006-09-14 | Japan Nuclear Cycle Development Inst States Of Projects | Electromagnetic ultrasonic flaw detection / measurement method and apparatus |
| CN201229172Y (en) * | 2008-05-23 | 2009-04-29 | 北京工业大学 | Electromagnetical supersonic transducer for detecting ferromagnetic pipe |
| CN101710103A (en) * | 2009-11-27 | 2010-05-19 | 华中科技大学 | Unidirectional testing method of magnetostrictive guided waves |
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Effective date of registration: 20160612 Address after: 100081 Beijing sorghum Bridge ramp street, No. 13, No. Patentee after: NCS Testing Technology Co., Ltd. Address before: 100081 Haidian District Institute of South Road, Beijing, No. 76 Patentee before: Central Iron & Steel Research Institute |
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Address after: 100081 Beijing sorghum Bridge ramp street, No. 13, No. Patentee after: The detection technology of NCS Limited by Share Ltd Address before: 100081 Beijing sorghum Bridge ramp street, No. 13, No. Patentee before: NCS Testing Technology Co., Ltd. |
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