CN106290453A - A kind of detection method of material solidification - Google Patents
A kind of detection method of material solidification Download PDFInfo
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- CN106290453A CN106290453A CN201610771224.1A CN201610771224A CN106290453A CN 106290453 A CN106290453 A CN 106290453A CN 201610771224 A CN201610771224 A CN 201610771224A CN 106290453 A CN106290453 A CN 106290453A
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- piezoelectric patches
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- solidification
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
- G01N25/06—Analysis by measuring change of freezing point
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The method that the invention discloses the detection of a kind of material solidification, the present invention is based on ultrasound wave propagation characteristic in a fiber, choose suitable piezoelectric patches and optical fiber couples, produce ultrasound wave by applying suitable pumping signal to piezoelectric patches, received the signal reflected the most again by piezoelectric patches.Because the difference of detection material solidification degree can cause them different from the degree of coupling of optical fiber, in turn result in the difference of energy attenuation, so the energy of the ultrasound wave finally reflected will be different.Utilize this characteristic, observe the signal amplitude change received and just can interpolate that whether material solidifies.The present invention uses optical fibers as ultrasound waveguide structure, it is possible to whether effectively detection material solidifies, and can be used for mixing the detection of the material solidification states such as earth, circuit board soldering tin, composite substrate, has a good application prospect.
Description
Technical field
The present invention relates to material solidification detection field, particularly relate to one and carry out material using optical fiber as ultrasound waveguide structure
The method of material solidification detection.
Background technology
The process that material becomes solid-state from liquid is called solidification, and in this process, its physics and chemical property all exist
Change.The method having multiple material solidification detection at present, mainly includes pulse current detection, electromagnetic detection, chemistry inspection
Survey, image detects and Acoustic detection etc..
The Chinese patent " for the power control system of metal solidification process " of Publication No. CN 1583326 A utilizes
It is in molten metal, be passed through pulse current, current amplitude can be made automatically to remain stable, pulse width and frequency continuously adjustabe, pulse
Metal alloy process of setting is accurately controlled and divides by the characteristic that electric current can carry out changing between unipolarity and bipolarity
Analysis.
The Chinese patent application of Publication No. CN 102500747 A discloses one and utilizes electromagnetic acoustic technology to detect
The technical scheme of continuous casting billet solidifying end, owing to S/N is low, low precision and damage billet quality, and can not expand electromagnetic acoustic
The scope that lifts away from of wave sensor and continuous casting billet and can not the problems such as stably long-time measurement continuously, utilize electromagnetic ultrasonic wave
Technology detects the technology of continuous casting billet solidifying end does not has an example to be successfully applied to the report of practice.
The patent " continuous casting billet solid rate and the detection method of solidification end " of Publication No. CN 103048242 A is by adopting
With directly applying vibratory stimulation to continuous casting billet, make continuous casting billet generation elastic deformation, and then measure continuous casting billet and vibratory stimulation resonance
After maximum strain, the stress being applied on continuous casting billet and stress/strain phase contrast, can be according to the solid rate of continuous casting billet-dynamic
Morphotype rating curve obtains solid rate and the solidification end position of continuous casting billet.
As the method for the solidified structure manifesting ingot bar, generally implement following method: use picric acid as main constituent
Corrosive liquid etc. come corrosion sample surface.It addition, the method for the solidified structure manifested as record, etch printing method is proposed
So-called etch printing method, be make the abradant surface contact corrosion liquid of sample and corrode abradant surface after, carry out sample washing, being dried,
In the etch pit on the abradant surface surface corroded, imbed grounds travel, at abradant surface surface mount Clear tape, make etch pit
In grounds travel be adhered to Clear tape after, peel off adhesive tape, the then method of glue adhesive tape on the hardboard of white.
Grounds travel in embedment etch pit is needed on adhesive tape, makes solidified structure show by glue adhesive tape on hardboard
On hardboard.
Japan Patent JP52-130422 utilizes electromagnetic acoustic transverse wave sensor that continuous casting billet is projected electromagnetic acoustic shear wave, and
Utilize electromagnetic acoustic shear wave can not pass through the principle of liquid phase to judge the complete curdled appearance of continuous casting billet.But, through continuous casting billet
The signal of the electromagnetic ultrasonic wave shear wave that CN 102500747A description is page 4 2,/11 5 there occurs that weaken or disappear can not the most only
One judges to there is residual motlten metal in foundry goods, because there is also other the factor causing signal to weaken or disappearing.
Current acoustic detection has been able to detect for the solidification of steel billet, and utilization is that ultrasound wave propagation on steel billet is special
Property and the change of material self.
Solidification detection the most only applies in the middle of industry, also has at medical domain and uses widely.Such as apply for disclosure
Number CN 102478580 A " method for quick of a kind of whole blood coagulation function ", the method is by using ultrasound examination whole blood
In specimen, metal bar rotates (movement) situation and detects the solidification function of blood.The method is without separated plasma, directly by whole blood
Adopt in detection cup (anticoagulant or not anticoagulant), detection cup has the stirring that a metal (or can be with other material of outer wrapping) is bar-shaped
Son, is additionally arranged at the bottom a rotating magnet at detection cup during detection.Front stirrer is not solidified along with rotating magnet rotation, blood at blood
After liquid solidification, stirrer meets obstructions and stops operating.Install a supersonic detector additional in the side of detection cup, existed by detection
Stirrer rotation/static judgement blood coagulation situation in blood.
Application publication number CN 103543278 A " determines blood coagulation characteristic ", and this invention relates to determining that blood coagulation is special
Property.In some instances, equipment applies voltage difference on blood sample.Equipment measures the telecommunications through blood sample within certain persistent period
Number, to obtain multiple measurement results of the measurement functions of express time.May determine that the accumulative characteristic of measurement functions so that accumulative
Characteristic is relevant to blood coagulation characteristic.
Detection method in sum, has significant limitation, and cost is relatively big, and operating process is the most complex.
So invention utilization is ultrasound wave propagation characteristic in a fiber, the change of optical fiber surrounding can affect ultrasound wave
By processing acoustic signal analysis, propagation in a fiber, judges that material solidifies the most completely.This method is not only limited to
Solidification in metal material detects, it may also be used for the inspection of the mixed nonmetallic materials curdled appearance such as clay structure, composite substrate
Survey.Detection range is extensive, simple to operate efficiently, and material itself will not be brought damage.
Summary of the invention
The present invention provides a kind of applied widely and material solidification detection method of efficient lossless.
The technical solution adopted in the present invention is: propagate ultrasound wave using optical fiber as waveguiding structure, utilizes ring around optical fiber
The change in border can affect ultrasound wave this characteristic of propagation in a fiber.The process that material becomes solid-state from liquid is called solidification,
In this process, its physics and chemical property are all changing.When material is when being in the state of complete liquid, optical fiber
Coupled degree is the highest, adds and can be reflected to around by liquid when ultrasound wave is propagated in a fiber, energy attenuation system
Number maximum, thus cause energy loss is also maximum, the energy of the echo therefore received is minimum, is presented as in an experiment
Reflex amplitude is minimum.But when material is in the state solidified completely, the degree of coupling and energy decay estimation are all significantly less than
In process of setting, Minimal energy loss when ultrasound wave is propagated in a fiber, the energy of the echo therefore received is maximum, in reality
It is presented as in testing that reflex amplitude is maximum.The curdled appearance of material so can be detected by the change of ultrasonic energy.This
Method comprises the following steps:
1. choose suitable piezoelectric patches to couple with optical fiber one end, the other end of piezoelectric patches then with Signal generator and letter
The coupling of number amplifier；
2. load appropriate excitation signal to piezoelectric patches by signal exciting bank；
3. on piezoelectric patches, connect the docking collection of letters number of suitable amplifier be amplified processing；
4. connect data acquisition unit at amplifier out；
5. the other end of optical fiber is inserted in non-condensable material to be detected；
6. gather data in computer；
It is analyzed processing to collection data the most on computers and obtains and demonstrate the piezoelectric patches signal received；
The most As time goes on, judge whether material solidifies by observation comparison signal amplitude change.
Compared with prior art, the invention have the advantage that
(1) optical fiber and piezoelectric patches are easier to obtain, and cost of manufacture is low；
(2) test system structure is fairly simple, it is not necessary to complicated Design and Machining；
(3) chemical constitution of some materials will not be damaged；
(4) easily operate, it is not necessary to the most complicated analysis and calculating.
Accompanying drawing explanation
Fig. 1 is detecting system structured flowchart；
Fig. 2 is 5 cycles normalization sinusoidal signals after Hanning window is modulated；
Fig. 3 is ethyl α-cyanoacrylate (being commonly called as 502 glue) receiving end signal when not having started solidification；
Receiving end signal when Fig. 4 is that after 5 minutes, ethyl α-cyanoacrylate solidifies；
Receiving end signal when Fig. 5 is that after 15 minutes, ethyl α-cyanoacrylate solidifies completely.
Detailed description of the invention
Content in conjunction with the inventive method provides the following example detecting material solidification, specifically comprises the following steps that
1. choose long strip type PZT piezoelectric ceramics, a size of 30mm × 3mm × 1mm；
2. choosing fiber lengths is 50mm, and wherein fibre external diameters is 62.5um.
3. use 502 glue PZT piezoelectric ceramic piece and optical fiber to be coupled and keep piezoelectric ceramics length direction with
Fiber length is consistent；
4. build detecting system structured flowchart as shown in Figure 1；
5. applying 5 cycle peak-to-peak values by ultrasonic action device is 10V, and mid frequency is the Hanning window modulation of 700kHz
After sinusoidal signal, normalized curve is as shown in Figure 2；
6. at computer terminal, collection data are analyzed process obtain and demonstrate piezoelectric patches signal；
7. taking appropriate 502 glue and drop in optical fiber connector, be t=0min when note optical fiber has just touched glue, now signal is adopted
Collection data obtain signal as it is shown on figure 3, the label 1 in Fig. 3 is ultrasound wave first reflection after computer analyzes and processes
Signal, owing under liquid condition, signal attenuation coefficient is maximum to such an extent as to can only receive reflected signal once, its peak-to-peak value is
14.4mV；
8. to Computer display signal after 502 glue 5min as shown in Figure 4, glue is solidifying but the most complete optical fiber contact
Solidification, the label 1,2,3,4,5 in Fig. 4 is the reflected signal of the first time to the 5th time that signal receiver receives respectively, its
Peak-to-peak value is respectively 3.60mV, 1.733mV, 1.06mV, 1.01mV, 0.76mV.
9. optical fiber contact to Computer display signal after 502 glue 15min as it is shown in figure 5, now glue the most solidifying
Gu, the attenuation quotient of signal arrives minimum, the reflected signal amplitude maximum received.Label 1,2,3,4,5 in Fig. 5 is respectively
The reflected signal of the first time that signal receiver receives to the 5th time, its peak-to-peak value be respectively 5.70mV, 3.16mV,
2.610mV、2.30mV、1.91mV。
10. by optical fiber contact to the obvious decay of signal amplitude after glue, along with glue solidification amplitude attenuation gradually
Weakening and finally tend towards stability until material solidifies completely, amplitude no longer changes, and draws the conclusion of material solidification.
Claims (3)
1. the method for a material solidification detection, it is characterised in that comprise the following steps:
1) choosing suitable piezoelectric patches to couple with optical fiber one end, the other end of piezoelectric patches is then put with Signal generator and signal
Big device coupling.
2) appropriate excitation signal is loaded to piezoelectric patches by signal exciting bank.
3) on piezoelectric patches, connect the docking collection of letters number of suitable amplifier be amplified processing.
4) data acquisition unit is connected at amplifier out.
5) other end of optical fiber is inserted in non-condensable material to be detected.
6) data are gathered in computer.
7) it is analyzed processing and obtains and demonstrate the piezoelectric patches signal received gathering data on computers.
8) As time goes on, judge whether material solidifies by observation comparison signal amplitude change.
Method the most according to claim 1, it is characterised in that step 1) in, piezoelectric patches chooses strip, keeps piezoelectric patches
Length direction is consistent with fiber length.
Method the most according to claim 1, it is characterised in that step 1) in, the fibre diameter chosen is ultrasonic less than being applied
Wave-wave is long.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610771224.1A CN106290453A (en) | 2016-08-30 | 2016-08-30 | A kind of detection method of material solidification |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610771224.1A CN106290453A (en) | 2016-08-30 | 2016-08-30 | A kind of detection method of material solidification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562824A (en) * | 2018-06-20 | 2018-09-21 | 武汉讯康电子技术有限公司 | A kind of electric cable failure detector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2232983C2 (en) * | 2002-10-02 | 2004-07-20 | Белов Михаил Алексеевич | Method and device for laser-acoustic test of solid materials |
| CN101256171A (en) * | 2008-04-03 | 2008-09-03 | 华中科技大学 | Method and system for real time monitoring ultrasound wave during composite material curing process |
| CN101817074A (en) * | 2009-08-18 | 2010-09-01 | 韩德玮 | Continuous casting and continuous forging device and method |
| CN104359633A (en) * | 2014-12-05 | 2015-02-18 | 电子科技大学 | Ultrasonic testing method for liquid leakage |
| CN104764803A (en) * | 2014-12-25 | 2015-07-08 | 电子科技大学 | Material stress detection technology based on changes of wavelength of supersonic waves |
-
2016
- 2016-08-30 CN CN201610771224.1A patent/CN106290453A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2232983C2 (en) * | 2002-10-02 | 2004-07-20 | Белов Михаил Алексеевич | Method and device for laser-acoustic test of solid materials |
| CN101256171A (en) * | 2008-04-03 | 2008-09-03 | 华中科技大学 | Method and system for real time monitoring ultrasound wave during composite material curing process |
| CN101817074A (en) * | 2009-08-18 | 2010-09-01 | 韩德玮 | Continuous casting and continuous forging device and method |
| CN104359633A (en) * | 2014-12-05 | 2015-02-18 | 电子科技大学 | Ultrasonic testing method for liquid leakage |
| CN104764803A (en) * | 2014-12-25 | 2015-07-08 | 电子科技大学 | Material stress detection technology based on changes of wavelength of supersonic waves |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562824A (en) * | 2018-06-20 | 2018-09-21 | 武汉讯康电子技术有限公司 | A kind of electric cable failure detector |
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