CN103316831B - A kind of supersonic generator based on linear frequency modulation technology detects the method for metal welding seam defect - Google Patents
A kind of supersonic generator based on linear frequency modulation technology detects the method for metal welding seam defect Download PDFInfo
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Abstract
Supersonic generator based on linear frequency modulation technology detects a method for metal welding seam defect, relates to Welding Structure technical field of quality detection.The ultrasonic signal propagation distance that the invention solves the generation of existing ultrasound detection signal generating means is short, to the problem of the little defect detection ability of heavy thickness super metal part weld seam.Linear FM signal circuit for generating of the present invention produces linear FM signal by the first control unit, the second control unit and host computer, and the weld seam pulse signal of generation being emitted to metal works detects metal works to be measured, ultrasonic collecting device is adopted to gather the ultrasonic signal reflected through metal works weld seam, utilize host computer to carry out matched filtering to the ultrasonic signal received, obtain metal welding seam defective locations.The present invention is applicable to Welding Structure technical field of quality detection.
Description
Technical field
The present invention relates to Welding Structure technical field of quality detection.
Background technology
Along with industrial high speed development, heavy thickness Welding Structure is widely used in the fields such as boiler, pressure vessel, shipbuilding, often be in the extreme environments such as high temperature, high pressure or top load due to these structures, therefore require higher, in case have an accident to its welding quality.As the ultrasonic detecting technology of one of method of quality control, in the welded detection of heavy thickness, occupy critical role.
But, for the welded ultrasound detection of heavy thickness, because ultrasonic signal propagation distance is short and the impact of seam organization, make the Detection capability of little defect poor, be unfavorable for welded quality evaluation.
Summary of the invention
The present invention in order to solve existing ultrasound detection signal generating means produce ultrasonic signal propagation distance short, to the problem of the little defect detection ability of heavy thickness super metal part weld seam, propose a kind of method that supersonic generator based on linear frequency modulation technology detects metal welding seam defect.
A kind of supersonic generator based on linear frequency modulation technology detects the method for metal welding seam defect, it adopts the following supersonic generator based on linear frequency modulation technology to realize, and this supersonic generator is made up of host computer, the first control unit, linear FM signal circuit for generating, the second control unit, power amplification circuit and ultrasonic wave change-over circuit;
First control unit control signal output of host computer connects the control signal input of the first control unit, a control signal input of the control signal output connecting linear FM signal circuit for generating of the first control unit, No. two control signal inputs of the FM signal control signal output connecting linear FM signal circuit for generating of host computer, second control signal output of host computer connects the control signal input that second controls electric unit, No. three control signal inputs of the control signal output connecting linear FM signal circuit for generating of the second control unit, the linear FM signal output of linear FM signal circuit for generating connects the linear FM signal input of power amplification circuit, the amplified signal output of power amplification circuit connects the ultrasonic signal input of ultrasonic wave change-over circuit,
First control unit is used for the dutycycle of the pulse signal that control linear FM signal circuit for generating produces;
Second control unit is used for the pulse width of the pulse signal that control linear FM signal circuit for generating produces;
It is characterized in that, the concrete steps of the method are:
Step one, host computer initialize, and carry out initiation parameter setting to the first control unit, the second control unit and linear FM signal circuit for generating simultaneously;
The duty cycle control signal of pulse signal is sent to linear FM signal circuit for generating by step 2, the first control unit; The width control signal of pulse signal is sent to linear FM signal circuit for generating by the second control unit;
Step 3, linear FM signal circuit for generating receive the control signal of the first control unit and the transmission of the second control unit, produce chirp pulse signal, and the chirp pulse signal of generation is passed to power amplification circuit;
Step 4, power amplification circuit are sent to ultrasonic wave change-over circuit after carrying out power amplification to the chirp pulse signal received;
The chirp pulse signal received is carried out piezoelectricity conversion by step 5, ultrasonic wave change-over circuit, obtains ultrasonic signal, this ultrasonic signal is aimed at the weld seam of metal works to be measured, start to detect metal works to be measured;
Step 6, employing ultrasonic collecting device gather the ultrasonic signal reflected through metal works weld seam, and the ultrasonic signal of collection are passed to host computer;
Step 7, host computer carry out matched filtering to the ultrasonic signal received, and obtain metal welding seam defect curve map;
Step 8, according to the metal welding seam defect curve map obtained, obtain metal welding seam defective locations, complete the detection of a metal welding seam defect.
The present invention is used for the detection to the metal welding seam of thickness within the scope of 0-200mm, hyperacoustic propagation distance that the present invention adopts the supersonic generator based on linear frequency modulation technology to obtain and existing supersonic generator obtain hyperacoustic propagation distance and improve 20% on year-on-year basis, the ultrasonic signal adopting supersonic generator of the present invention to obtain improves the identification to heavy thickness metal weldedstructure defect, and accuracy of identification improves 30% compared with existing apparatus.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of supersonic generator based on linear frequency modulation technology of the present invention;
Fig. 2 is the graph of relation of the Time And Frequency of ultrasound detection signal when adopting sweep method from low to high; In figure, t1 represents pulse width, unit ms, and t2 represents the pulse spacing, and unit is that ms, F1 represent frequency modulation lower limit, and unit is that MHz, F2 represent the frequency modulation upper limit, and unit is MHz;
Fig. 3 is the graph of relation of the Time And Frequency of ultrasound detection signal when adopting the sweep method from high frequency to low frequency;
In figure, t3 represents pulse width, unit ms, and t4 represents the pulse spacing, and unit is that ms, F3 represent frequency modulation lower limit, and unit is that MHz, F4 represent the frequency modulation upper limit, and unit is MHz.
Detailed description of the invention
Detailed description of the invention one: composition graphs 1 illustrates present embodiment, a kind of supersonic generator based on linear frequency modulation technology described in present embodiment, this supersonic generator is made up of host computer 1, first control unit 2, linear FM signal circuit for generating 3, second control unit 4, power amplification circuit 5 and ultrasonic wave change-over circuit 6;
First control unit control signal output of host computer 1 connects the control signal input of the first control unit 2, a control signal input of the control signal output connecting linear FM signal circuit for generating 3 of the first control unit 2, No. two control signal inputs of the FM signal control signal output connecting linear FM signal circuit for generating 3 of host computer 1, second control signal output of host computer 1 connects the control signal input that second controls electric unit 4, No. three control signal inputs of the control signal output connecting linear FM signal circuit for generating 3 of the second control unit 4, the linear FM signal output of linear FM signal circuit for generating 3 connects the linear FM signal input of power amplification circuit 5, the amplified signal output of power amplification circuit 5 connects the ultrasonic signal input of ultrasonic wave change-over circuit 6,
The dutycycle of the pulse signal that the first control unit 2 produces for control linear FM signal circuit for generating 3;
The pulse width of the pulse signal that the second control unit 4 produces for control linear FM signal circuit for generating 3.
The volume of the supersonic generator described in present embodiment is little, relatively carries, easy to use at the scene; Meanwhile, this supersonic generator can be embedded in existing ultrasonic detection equipment because of small volume, detects under making the excitation of existing equipment Linear Frequency Modulation signal.
Signal generation apparatus described in present embodiment can produce the linear FM signal of certain voltage, certain power, and is added on ultrasonic sensor by this signal.
Detailed description of the invention two: present embodiment is further illustrating a kind of supersonic generator based on linear frequency modulation technology described in detailed description of the invention one, linear FM signal circuit for generating 3 adopt model be AD9910 chip realize.
Detailed description of the invention three: embodiment is further illustrating a kind of supersonic generator based on linear frequency modulation technology described in detailed description of the invention one, ultrasonic wave change-over circuit 6 adopts ultrasonic normal probe, ultrasonic angle probe, focus ultrasonic probe, ultrasonic band curvature probe or ultrasonic surface wave probe.
Detailed description of the invention four: adopt a kind of supersonic generator based on linear frequency modulation technology described in detailed description of the invention one to detect the method for metal welding seam defect, the concrete steps of the method are:
Step one, host computer 1 initialize, and carry out initiation parameter setting to the first control unit 2, second control unit 4 and linear FM signal circuit for generating 3 simultaneously;
The duty cycle control signal of pulse signal is sent to linear FM signal circuit for generating 3 by step 2, the first control unit 2; The width control signal of pulse signal is sent to linear FM signal circuit for generating 3 by the second control unit 4;
Step 3, linear FM signal circuit for generating 3 receive the control signal of the first control unit 2 and the transmission of the second control unit 4, produce chirp pulse signal, and the chirp pulse signal of generation is passed to power amplification circuit 5;
Step 4, power amplification circuit 5 are sent to ultrasonic wave change-over circuit 6 after carrying out power amplification to the chirp pulse signal received;
The chirp pulse signal received is carried out piezoelectricity conversion by step 5, ultrasonic wave change-over circuit 6, obtains ultrasonic signal, this ultrasonic signal is aimed at the weld seam of metal works to be measured, start to detect metal works to be measured;
Step 6, employing ultrasonic collecting device gather the ultrasonic signal reflected through metal works weld seam, and the ultrasonic signal of collection are passed to host computer;
Step 7, host computer carry out matched filtering to the ultrasonic signal received, and obtain metal welding seam defect curve map;
Step 8, according to the metal welding seam defect curve map obtained, obtain metal welding seam defective locations, complete the detection of a metal welding seam defect.
Detailed description of the invention five: composition graphs 2 and Fig. 3 illustrate present embodiment, present embodiment detects further illustrating of the method for metal welding seam defect to a kind of supersonic generator based on linear frequency modulation technology described in detailed description of the invention three, and the mode that the weld seam to metal works described in step 2 carries out frequency sweep is mode from low to high or the mode from high frequency to low frequency.
Detailed description of the invention six: present embodiment detects further illustrating of the method for metal welding seam defect to a kind of supersonic generator based on linear frequency modulation technology described in detailed description of the invention four, and the tuning range of the acquisition chirp pulse signal described in step 3 is 0Hz-20MHz.
Detailed description of the invention seven: present embodiment detects further illustrating of the method for metal welding seam defect to a kind of supersonic generator based on linear frequency modulation technology described in detailed description of the invention one, acquisition chirp pulse signal described in step 3, pulse width is 1 μ s to 1ms, and the pulse spacing is greater than 1ms.
Host computer of the present invention adopts the desktop operating system operating in PC and Mac machine: Mac OS X or Linux issues version (as Debian, Ubuntu, Linux Mint, openSUSE, Fedora etc.), Windows XP, WindowsVista, Windows 7 or Windows 8; Operate in the operating system that built-in field is conventional: built-in Linux, WindowsEmbedded, VxWorks; Operate in the operating system of the consumption electronic product such as smart mobile phone or panel computer: Android, iOS, Symbian, Windows Phone or BlackBerry OS.
Claims (5)
1. the method for the detection of the supersonic generator based on a linear frequency modulation technology metal welding seam defect, it realizes according to the following supersonic generator based on linear frequency modulation technology, and this supersonic generator is made up of host computer (1), the first control unit (2), linear FM signal circuit for generating (3), the second control unit (4), power amplification circuit (5) and ultrasonic wave change-over circuit (6);
First control unit control signal output of host computer (1) connects the control signal input of the first control unit (2), a control signal input of control signal output connecting linear FM signal circuit for generating (3) of the first control unit (2), No. two control signal inputs of FM signal control signal output connecting linear FM signal circuit for generating (3) of host computer (1), second control signal output of host computer (1) connects the control signal input that second controls electric unit (4), No. three control signal inputs of control signal output connecting linear FM signal circuit for generating (3) of the second control unit (4), the linear FM signal output of linear FM signal circuit for generating (3) connects the linear FM signal input of power amplification circuit (5), the amplified signal output of power amplification circuit (5) connects the ultrasonic signal input of ultrasonic wave change-over circuit (6),
The dutycycle of the pulse signal that the first control unit (2) produces for control linear FM signal circuit for generating (3);
The pulse width of the pulse signal that the second control unit (4) produces for control linear FM signal circuit for generating (3);
It is characterized in that, the concrete steps of the method are:
Step one, host computer (1) initialize, and carry out initiation parameter setting to the first control unit (2), the second control unit (4) and linear FM signal circuit for generating (3) simultaneously;
The duty cycle control signal of pulse signal is sent to linear FM signal circuit for generating (3) by step 2, the first control unit (2); The width control signal of pulse signal is sent to linear FM signal circuit for generating (3) by the second control unit (4);
Step 3, linear FM signal circuit for generating (3) receive the control signal that the first control unit (2) and the second control unit (4) send, produce chirp pulse signal, and the chirp pulse signal of generation is passed to power amplification circuit (5);
Step 4, power amplification circuit (5) are sent to ultrasonic wave change-over circuit (6) after carrying out power amplification to the chirp pulse signal received;
The chirp pulse signal received is carried out piezoelectricity conversion by step 5, ultrasonic wave change-over circuit (6), obtains ultrasonic signal, this ultrasonic signal is aimed at the weld seam of metal works to be measured, start to detect metal works to be measured;
Step 6, employing ultrasonic collecting device gather the ultrasonic signal reflected through metal works weld seam, and the ultrasonic signal of collection are passed to host computer;
Step 7, host computer carry out matched filtering to the ultrasonic signal received, and obtain metal welding seam defect curve map;
Step 8, according to the metal welding seam defect curve map obtained, obtain metal welding seam defective locations, complete the detection of a metal welding seam defect.
2. a kind of supersonic generator based on linear frequency modulation technology according to claim 1 detects the method for metal welding seam defect, it is characterized in that, linear FM signal circuit for generating (3) employing model is that the chip of AD9910 realizes.
3. a kind of supersonic generator based on linear frequency modulation technology according to claim 1 detects the method for metal welding seam defect, it is characterized in that, ultrasonic wave change-over circuit (6) adopts ultrasonic normal probe, ultrasonic angle probe, focus ultrasonic probe, ultrasonic band curvature probe or ultrasonic surface wave probe to realize.
4. a kind of supersonic generator based on linear frequency modulation technology according to claim 1 detects the method for metal welding seam defect, and it is characterized in that, the tuning range of the acquisition chirp pulse signal described in step 3 is 0Hz-20MHz.
5. a kind of supersonic generator based on linear frequency modulation technology according to claim 1 detects the method for metal welding seam defect, it is characterized in that, the pulse width of the acquisition chirp pulse signal described in step 3 is 1 μ s to 1ms, and the pulse spacing is greater than 1ms.
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| KR102193234B1 (en) * | 2013-11-25 | 2020-12-18 | 현대모비스 주식회사 | Device for increasing the detection distance of ultrasonic sensors of vehicle and method thereof |
| CN103808809B (en) * | 2014-03-12 | 2016-02-17 | 哈尔滨工业大学 | A kind of ultrasound echo signal real-time processing device based on linear FM signal excitation and disposal route |
| CN104634874B (en) * | 2015-02-06 | 2018-08-24 | 宝钢轧辊科技有限责任公司 | Large forged back -up roll body of roll working lining defect inspection method |
| EP3620292A1 (en) * | 2018-09-07 | 2020-03-11 | Aisapack Holding SA | Method and device for producing a packing weld |
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