CN1908649B - A concrete structure tomography detection system - Google Patents
A concrete structure tomography detection system Download PDFInfo
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- CN1908649B CN1908649B CN200610104465A CN200610104465A CN1908649B CN 1908649 B CN1908649 B CN 1908649B CN 200610104465 A CN200610104465 A CN 200610104465A CN 200610104465 A CN200610104465 A CN 200610104465A CN 1908649 B CN1908649 B CN 1908649B
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Abstract
本发明公开了一种混凝土结构层析成像检测系统，该系统包括一个由PCI总线相互连接的CPU卡、A/D卡、信号处理卡，还包括一个发射电源和一个接收换能器阵列；接收换能器阵列与超磁致伸缩稀土发射换能器连接，接收换能器阵列的输出端与信号处理卡连接，信号处理卡与超声发射电源相连，超声发射电源与超磁致伸缩稀土发射换能器的输入端连接，信号处理卡与A/D卡连接，CPU卡、A/D卡、信号处理卡分别与PCI总线连接。本发明操作简单，显示直观，对使用者的专业经验和技能要求相对较低，高精度、智能化的超声检测设备，能够实时、准确地显示出混凝土内部结构特征。
The invention discloses a concrete structure tomography detection system, which comprises a CPU card, an A/D card, and a signal processing card interconnected by a PCI bus, and also includes a transmitting power supply and a receiving transducer array; The transducer array is connected with the giant magnetostrictive rare earth transmitting transducer, the output end of the receiving transducer array is connected with the signal processing card, the signal processing card is connected with the ultrasonic transmitting power supply, and the ultrasonic transmitting power supply is connected with the giant magnetostrictive rare earth transmitting transducer. The input end of the energy device is connected, the signal processing card is connected with the A/D card, and the CPU card, A/D card, and signal processing card are respectively connected with the PCI bus. The invention is simple in operation, intuitive in display, relatively low in professional experience and skill requirements for users, high-precision and intelligent ultrasonic detection equipment, and can display concrete internal structure characteristics in real time and accurately.
Description
Technical field
The invention belongs to the xoncrete structure detection technique, particularly xoncrete structure ultrasound computed tomography tomography detection technique.
Background technology
Xoncrete structure is one of important component of engineerings such as bridge, tunnel and industrial civil building, and its bulk properties detect significant for engineering quality evaluating and safety assessment.The traditional detection method of xoncrete structure is to the destructive strength test of the work of the cube specimen of sampling making.Practice shows, with the measured xoncrete structure performance index of specimen test, often with works in the performance of actual xoncrete structure have than big difference.Therefore, directly detect the on-the-spot detection technique of xoncrete structure performance, become the important means of concrete engineering quality management.
The on-the-spot detection comprises core boring sampling and two kinds of methods of Non-Destructive Testing, and wherein the method for Non-Destructive Testing is owing to making things convenient for, efficiently and to the harmless advantage of engineering structure having obtained general application.
In the lossless detection method of xoncrete structure, the most frequently used and effective method is a supersonic testing method, compare as lossless detection methods such as high-frequency electromagnetic radar, infrared imaging, microwave and resilience small strains with other, supercritical ultrasonics technology has that the measurand scope is wide, investigation depth is big, detection sensitivity is high, cost is low, detection speed reaches on-the-spot advantage such as easy to use soon.Therefore, supercritical ultrasonics technology is to be subjected to a kind of xoncrete structure Dynamic Non-Destruction Measurement of extensively paying attention to and developing rapidly both at home and abroad, be widely used at present in the internal soundness detection of xoncrete structure, and be put in the inspection procedure of some departments, place and the Engineering Standardization council.
The principle of ultrasound examination is by ultrasound emission probe effect detected concrete structure, the ultrasonication stress wave penetrates or reflects at the interface at inside concrete, obtain velocity of wave, wave amplitude, signal spectrum and signal waveform by receiving transducer and signal detection apparatus then, pass through to received signal analysis and interpretation again, and obtain quantitative or qualitative description, thereby the security and the quality of xoncrete structure are monitored and estimated concrete component intensity, inherent vice (cavity, crack, segregation, interlayer, leakiness etc.) and thickness etc.
A large amount of both at home and abroad at present concrete nondestructive detecting instruments that adopt are based on analyzing and processing and the artificial interpretation to the one-dimensional signal that is received, inefficiency, poor reliability basically.Because the composite material that concrete is made up of cement, sand, thick bone loose material, simultaneously owing to testing conditions circumstance complication in the bridge detection, influence factor is many, directly from the one dimension received signal, obtain more definitely also to have sizable difficulty and uncertainty, generally need to rely on the suitable working experience of device operator about the description of concrete internal soundness.This has become serious restriction concrete Ultrasonic Detection means and has popularized and the one of the main reasons that develops.
The shortcoming of traditional ultrasound wave concrete nondestructive testing instrument mainly contains following aspect:
1) the ultrasonic emitting source is made by piezoceramic material, and emissive power is little, and in the xoncrete structure of large volume detected, therefore the poor signal to noise of received signal detected effect meeting serious degradation;
2) frequency band of piezoelectric ceramic ultrasonic emissive source is narrow, and therefore when the transponder pulse signal, aftershock hangover long (being generally 5 above oscillation period) is disturbed owing to hangover forms reflection wave in thickness measuring is used, and made that the detection performance is seriously limited.
3) adopt single pass one-dimensional signal collection and analysis, the related information of adjacent check point is not used effectively.
Summary of the invention
The objective of the invention is to overcome above-mentioned prior art deficiency, a kind of concrete structure tomographic imaging detection system is provided, this system operation is simple, intuitive display, professional experiences and technical ability to the user require relatively low, high precision, intelligentized ultrasonic detection equipment can demonstrate the concrete inner structure feature in real time, exactly.
Technical scheme of the present invention is achieved in that and the present invention includes one by the interconnective CPU card of pci bus, A/D card, signal processing card, also comprises an emission power and a receiving transducer array; The receiving transducer array is connected with the super magnetostrictive rare-earth transmitting transducer, the output terminal of receiving transducer array and signal Processing card connection, signal processing card links to each other with the ultrasound emission power supply, the ultrasound emission power supply is connected with the input end of super magnetostrictive rare-earth transmitting transducer, signal processing card and A/D card connection, CPU card, A/D card, signal processing card are connected with pci bus respectively.
Described ultrasound emission power supply is linked to each other with resistance R 1 by direct supply E, and R1 links to each other with diode D1, diode D1 respectively with storage capacitor C and resistance R
TLink to each other, storage capacitor C respectively with diode D2, resistance R
SLink to each other resistance R
TWith switching tube V
TLink to each other resistance R
S, inductance L
S, inductance L
eLink to each other switching tube V successively
T, diode D2, inductance L
eGround connection.
Described super magnetostrictive rare-earth transmitting transducer, the giant magnetostrictive rod shell is housed in the enclosure, in the giant magnetostrictive rod shell, giant magnetostrictive rod is housed, giant magnetostrictive rod one end links to each other with attacking head, the other end is fixed on the briquetting, fixed block is housed above briquetting, both sides are equipped with transducer winding respectively between giant magnetostrictive rod shell and giant magnetostrictive rod, transducer winding one end links to each other with power supply by lead, the other end is fixed on the giant magnetostrictive rod shell, two transducer winding link to each other with lead, and pretension spring is equipped with in both sides between shell and giant magnetostrictive rod shell, and power supply is arranged in the giant magnetostrictive rod shell.
Described signal processing card, connecting first respectively by first attenuator circuit selects amplifying circuit and the 3rd to select amplifying circuit, first selects amplifying circuit to link to each other with logic control circuit, logic control circuit also selects amplifying circuit, the 4th to select amplifying circuit, the 3rd to select amplifying circuit to link to each other with pci controller with second attenuator circuit, second respectively, the 4th selects amplifying circuit to be connected with second attenuator circuit, and second attenuator circuit and second selects amplifying circuit to be connected.
The present invention passes through the further investigation to the theory and technology problem of ultrasound wave xoncrete structure Non-Destructive Testing, improving aspect supersonic source, the ultrasonic signal Acquisition Circuit, the emissive source of system has adopted the ultra-magnetic telescopic ultrasonic transducer based on rare earth material, because its emissive power is big, can detect the xoncrete structure of more volume, simultaneously because the aftershock little (less than 2 cycles) of pulse emission has special advantage in the concrete thickness measuring.The signal of system receives the parallel data acquisition circuit that has adopted 24 passages, and the A/D resolution of every passage is 12, and the sampling rate maximum can arrive per second 30M sampled point, and this makes tomography detect becomes possibility.In addition, the data channel of 24 passages can realize 24 acceptance points received signal simultaneously, has not only improved detection efficiency greatly, can guarantee the accurate consistance of sampling point position simultaneously, improves the precision degree of tomography.Because the employing of above-mentioned new technology, the system that is developed than traditional ultrasound measuring instrument intuitive, easy to operate, analyze the raising that aspects such as quantitatively objective and human factor influence is little have essence.
Description of drawings
Fig. 1 is a system construction drawing of the present invention.
Fig. 2 is ultrasound emission power supply architecture figure of the present invention.
Fig. 3 is a giant magnetostrictive transducer structural representation of the present invention.
Fig. 4 is a signal processing card principle assumption diagram of the present invention.
Below in conjunction with accompanying drawing content of the present invention is described in further detail.
Embodiment
With reference to shown in Figure 1, super magnetostrictive rare-earth transmitting transducer 1 is connected with receiving transducer array 2, the output terminal of receiving transducer array 2 is connected with signal processing card 6, signal processing card 6 links to each other with ultrasound emission power supply 7, ultrasound emission power supply 7 is connected with the input end of super magnetostrictive rare-earth transmitting transducer 1, signal processing card 6 is connected with AD card 5, and CPU card 4, AD card 5, signal processing card 6 are connected with pci bus 8 respectively.
The course of work of system is: CPU card 4 sends various configuration orders by pci bus 8 to signal processing card 6 and A/D card 5, and signal processing card 6 is ready with A/D card 5; After software was carried out the beginning acquisition, CPU card 4 write the beginning acquisition by pci bus 8 to the trigger register of signal processing card 6.Signal processing card 6 receives the triggering control signal of sending specific width, specific delays after the beginning acquisition respectively to emission power 7 and A/D card 5, emission power 7 is triggered after the trigger action beginning to transmitting transducer 1 effluve, begin after transmitting transducer 1 is excited to detected concrete member emission ultrasound wave, ultrasound wave is propagated to receiving transducer 2 arrays in the detected concrete member; Receiving transducer 2 array received are to ultrasonic signal and be converted into electric signal, and electric signal is delivered to A/D card 5 after signal processing card 6 is handled; A/D card 5 begins the A/D conversion after the control signal that receives signal processing card 6, the digital signal after will changing simultaneously is sent to calculator memory by pci bus 8, carries out data processing and tomography then and calculates.
With reference to shown in Figure 2, direct supply E links to each other with resistance R 1, and resistance R 1 links to each other with diode D1, and diode D1 links to each other with resistance R T with storage capacitor C respectively, and storage capacitor C links to each other resistance R with diode D2
TWith switching tube V
TLink to each other, trigger pulse links to each other with resistance R 2, resistance R 2 and switching tube V
TLink to each other storage capacitor C, resistance R
S, inductance L
SLink to each other inductance L successively
SLink to each other switching tube V respectively with inductance L e, capacitor C e, resistance R e
T, diode D2, inductance L e, capacitor C e, resistance R e ground connection.
The transducer drive process is: C is charged to 500V and is kept this voltage constant by direct supply E.When arriving, trigger pulse makes switching tube V
TAfter the conducting, the electric charge on the storage capacitor C is by switching tube V
TRapidly to coil B discharge, by B, C and R (≈ R
T+ R
S) discharge circuit formed is second order loop.In order to produce high-frequency current pulse, can be when discharge current reach the highest (≈ 100A), rapid on-off switching tube V
T, make electric current reduce to zero suddenly, so big electric current steep-sided pulse will cause the magnetostrictive rod attitude that affranchises after producing fierce expansion, thereby will make L at once
e, C
eParallel resonance (≈ 25kHz) takes place and to the external radiation high-strength ultrasonic.
With reference to shown in Figure 3, giant magnetostrictive rod shell 5 is housed in shell 1, giant magnetostrictive rod shell 5 is fixing by screw 3 and briquetting 4.Giant magnetostrictive rod 6 is housed in giant magnetostrictive rod shell 5, and giant magnetostrictive rod 6 one ends link to each other with attacking head 9, and the other end is fixed on the giant magnetostrictive rod shell 5.Between giant magnetostrictive rod shell 5 and giant magnetostrictive rod 6 transducer winding 7 is housed, transducer winding 7 one ends link to each other with power supply 2 by lead 10, and the other end is fixed on the giant magnetostrictive rod shell 5.Power supply 2 can provide 400v voltage.Utilize lead to link to each other between two transducer winding 7.Between shell 1 and giant magnetostrictive rod shell 5, pretension spring 8 is housed.
Its course of work is to produce a pulse current after power supply connects electricity, and this pulse current is applied on the transducer winding, and the transducer winding 7 after the energising produces alternating magnetic field.Giant magnetostrictive rod 6 produces telescopic variation under this action of alternating magnetic field, and puss head 9 produces vibration.Thus electric impulse signal is converted to efficiently the reciprocating machine vibration of attacking head 9, makes attacking head 9 send ultrasonic signal to testee.
With reference to shown in Figure 4, signal processing card 6, connecting first respectively by first attenuator circuit 20 selects amplifying circuit 21 and the 3rd to select amplifying circuit 25, first selects amplifying circuit 21 to link to each other with logic control circuit 23, logic control circuit 23 also selects amplifying circuit the 24, the 4th to select amplifying circuit the 26, the 3rd to select amplifying circuit 25 to link to each other with pci controller 22 with second attenuator circuit 27, second respectively, the 4th selects amplifying circuit 26 to be connected with second attenuator circuit 27, and second attenuator circuit 27 and second selects amplifying circuit 24 to be connected.
The super magnetostrictive rare-earth transmitting transducer is a kind of high-power efficiently energy conversion, and it can be converted into mechanical sound wave with the current impulse of input, and is radiated in the detected concrete member by radiating surface.The receiving transducer array is made up of 24 piezoelectric ceramic ultrasonic transducers, spacing between each transducer monomer is identical, the receiving transducer array can receive by rare earth transmitting transducer ultrasonic waves transmitted simultaneously at 24 measuring points of detected concrete member equal intervals, and the ultrasound wave that receives is converted to electric signal.24 passage ultrasonic signal samplers are made of Portable Reinforced Computer and built-in plug-in card, major function be with the simulating signal that the receiving transducer array transmits amplify decay, A/D conversion, digital signal processing and analysis etc., it is also to transmitting transducer output excitation pulse simultaneously.
The course of work of system is: 1) CPU sends various configuration orders by pci bus to signal processing card and A/D card, and signal processing card and A/D card are ready; 2) after software was carried out the beginning acquisition, CPU write the beginning acquisition by pci bus to the trigger register of signal processing card.Signal processing card receives the triggering control signal of sending specific width, specific delays after the beginning acquisition respectively to emission power and A/D card, emission power is triggered after the trigger action beginning to the transmitting transducer effluve, begin after transmitting transducer is excited to detected concrete member emission ultrasound wave, ultrasound wave is propagated to the receiving transducer array in the detected concrete member; 3) the receiving transducer array received is to ultrasonic signal and be converted into electric signal, and electric signal is delivered to the A/D card after signal processing card is handled; 4) beginning A/D changed after A/D was stuck in the control signal that receives signal processing card, and the digital signal after will changing simultaneously is sent to calculator memory by pci bus, carries out data processing and tomography then and calculates.
The present invention further adopts the emission of Data fusion technique and multiple tracks dot matrix to gather at random imaging technique with the multiple tracks dot matrix keeping traditional acquisition mode (single-shot list receipts or two are received) and surveying strong the survey on the scarce data processing technique basis. Can obtain more accurately first arrival time by spectrum analysis, improve and survey strong accuracy, by overlap-add procedure, can press and make an uproar, improve signal to noise ratio, outstanding useful information. In detecting, adopts on bridge the computer intelligence imaging technique, detected concrete member and reinforced concrete member are carried out the bidimensional tomography, reach position that the engineering problems such as the various defectives of reflection directly perceived, dialyse, crack exist and shape etc., realize that defective integrated image systems technology reproduces. Compare with conventional ultrasound detecting instrument equipment, main improvement is at aspects such as supersonic source, ultrasonic signal Acquisition Circuit and tomography algorithms.
Claims (3)
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| CN200610104465A CN1908649B (en) | 2006-08-03 | 2006-08-03 | A concrete structure tomography detection system |
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|---|---|---|---|
| CN200610104465A CN1908649B (en) | 2006-08-03 | 2006-08-03 | A concrete structure tomography detection system |
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| CN1908649B true CN1908649B (en) | 2010-05-12 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220767A (en) * | 2010-04-13 | 2011-10-19 | 云南航天工程物探检测股份有限公司 | Stress wave signal tester and acquisition method |
| CN103017954B (en) * | 2011-09-22 | 2015-07-15 | 北京理工大学 | Measuring method for plate stress field |
| CN103743820B (en) * | 2014-02-28 | 2016-08-17 | 江苏理工学院 | Concrete column quality ultrasonic detection device and method based on global transit time parameter |
| CN104090031B (en) * | 2014-07-16 | 2016-05-11 | 浙江省交通规划设计研究院 | A kind of pumping of prostressed duct quality detection device based on Ultrasonic Annular Phased Arrays |
| CN106556646B (en) * | 2016-11-18 | 2019-08-16 | 金陵科技学院 | Sound emission tomography determines the detection system at damages of concrete structures position |
| CN106525976B (en) * | 2016-11-18 | 2019-08-16 | 金陵科技学院 | Method based on sound emission tomography quantitative analysis damages of concrete structures position |
| CN106767515A (en) * | 2017-01-09 | 2017-05-31 | 重庆大学 | A kind of tunnel defect quick diagnosis prevention and controls |
| CN107643096A (en) * | 2017-07-24 | 2018-01-30 | 成都东易盛泰科技有限公司 | A kind of concrete porosity monitoring and recording instrument |
| CN112177672B (en) * | 2020-09-11 | 2021-09-03 | 山东大学 | Non-contact railway tunnel lining defect disease monitoring and early warning system and method |
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