CN109813745A - Non-destructive measuring method based on infrared thermal imaging on-line measurement hyperconductive cable back twist angle - Google Patents
Non-destructive measuring method based on infrared thermal imaging on-line measurement hyperconductive cable back twist angle Download PDFInfo
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- CN109813745A CN109813745A CN201910046554.8A CN201910046554A CN109813745A CN 109813745 A CN109813745 A CN 109813745A CN 201910046554 A CN201910046554 A CN 201910046554A CN 109813745 A CN109813745 A CN 109813745A
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Abstract
The invention discloses a kind of non-destructive measuring methods of pitch variation when on-line measurement hyperconductive cable back twist based on infrared thermal imaging, under the conditions of identical transillumination, utilize the infrared pitch image obtained between sub- cable, and then measurement of the realization to cable pitch variation, then pass through formula scales and obtain cable back twist angle.The present invention finally calculates the exact value of back twist angle in the case where not destroying conductor, through the size of infrared gap image between sub- cable on measurement egative film to determine the length and variation of sub- cable pitch, has the advantages that error is small, high-efficient.
Description
Technical field
It is specifically a kind of to be based on infrared thermal imaging on-line measurement the present invention relates to nuclear fusion device conductor measurement method field
The non-destructive measuring method of hyperconductive cable back twist angle.
Background technique
Nb3Sn superconducting wire is widely used in high field due to high ambient field (> 12T) still has compared with high current carrying capacity because of it
The Cable-in-conduit conductor of magnet system, such as magnetic confinement nuclear fusion device, high-intensity magnetic field, accelerator magnet etc..
And the conductor that Nb3Sn CICC conductor is traditional as superconduction forceful electric power technical field, it has been widely used in ITER TF
Conductor, CS conductor, Chinese high-intensity magnetic field device etc..In all devices, superconducting conductor is run under conditions of multi- scenarios method.Not
Come fusion demonstration reactor DEMO (power > 2GW, magnetic field > 15T, electric current > 100kA) or even commercial heap, it is strong to superconducting magnet magnetic field
Degree, superconducting coil ess-strain allow characteristic to have a higher requirement, and carrying is up to the electromagnetic force of 150 tons/meter and more by conductor
Up to hundreds of thousands of electromagnetism circulations, these will lead to the abrupt degradation of conductor performance.
Back twist is as Nb3The new phenomenon of Sn conductor performance degradation, causes the highest attention of ITER IO.2012, ITER
International group has found that back twist can cause Nb3The performance degradation of Sn conductor, each side carry out first with the help of the group of the world ITER
The test of conductor back twist rate, i.e. measurement back twist angle.Since conductive surface has stainless steel sheath, cable surface has stainless ladle
Band, it is difficult to directly measure.The method of existing general tested conductor back twist is to carry out the detection of cable pitch by destructive test,
And it can not on-line real-time measuremen.
Summary of the invention
The object of the present invention is to provide a kind of lossless surveys based on infrared thermal imaging on-line measurement hyperconductive cable back twist angle
Amount method, to solve Nb in prior art nuclear fusion device3Sn conductor back twist measurement can not on-line checking the problem of.
In order to achieve the above object, the technical scheme adopted by the invention is as follows:
Non-destructive measuring method based on infrared thermal imaging on-line measurement hyperconductive cable back twist angle, it is characterised in that: utilize
The heat distribution field of infrared detector and optical imaging objective acquisition when working online on tested hyperconductive cable, to be superconducted
The Infrared Thermogram of cable；Pitch between sub- cable will be shown in image with colour differentiation, using infrared between adjacent sub- cable
Image measures its spacing, is compared by authentic specimen, can get the variable quantity of cable pitch, then convert by correlation formula
It can get back twist rate, that is, back twist angle of cable, specifically includes the following steps:
(1), it samples: choosing authentic specimen of one section of cable without wearing cable as without back twist when first；Nb3Sn conductor
Wear cable it is molding during, due to the effect by tensile stress and compression, the back twist rate of cable be will increase, therefore select respectively
It takes and wears cable Nb after molding3The straightway at Sn conductor both ends is as subsequent contrast's sample；One section of front end conductor label is used as first
Sample, while choosing and wearing the molding Nb of cable3The continuous conductor in two sections of Sn conductor rear end is marked respectively as the second sample, third sample
The length of product, the first sample, the second sample and third sample is consistent with authentic specimen length；
(2), infrared thermal imaging acquires image: Nb3When Sn conductor coils are powered on online, infrared detector and light are utilized
It learns image-forming objective lens and receives Nb3The infrared radiation energy distribution pattern of Sn conductor, to obtain Nb3The Infrared Thermogram of Sn conductor, it is red
Pitch between each sub- cable is distinguished in the surface different temperatures region and conductor of conductor in outer thermal image in different colors；
(3), it measures: according to the infrared image for the thermal-induced imagery neutron cable that step (2) obtains, measuring electric in the first sample
Pitch size d1, d2, d3 between the infrared image of cable, keep identical measurement parameter, measure the second sample cable section respectively
Away from size d11, d21, d31 and third sample cable pitch size d12, d22, d32；
(4), it calculates cable pitch variation amount: step (3) being measured resulting as a result, being done respectively with the pitch of authentic specimen
Difference is denoted as Δ d finally using the average value of the difference of three samples as the variable quantity of pitch；
(5), it calculates cable back twist angle: according to the cable pitch variation amount Δ d in step (4), being calculated according to formula (1)
Cable back twist angle out:
R is cable radius when back twist not occurring in formula (1).
The invention proposes a kind of non-destructive measuring methods based on infrared thermal imaging on-line measurement hyperconductive cable back twist angle.
Thermal imaging be received using infrared detector and optical imaging objective measured target infrared radiation energy distribution pattern reflection arrive
On the light-sensitive element of infrared detector, to obtain Infrared Thermogram, this thermography is opposite with the heat distribution field of body surface
It answers, the different colours of the upper surface of thermal image represent the different temperatures of testee.Pitch between sub- cable will be distinguished with colour
Display in the picture, using the infrared image between adjacent sub- cable, measures its spacing, is compared by authentic specimen, can get electricity
The change rate of cable pitch, then converted by correlation formula and can get the back twist rate of cable, i.e. back twist angle.
Detailed description of the invention
Fig. 1 is measuring principle figure of the present invention.
Fig. 2 is Nb of the present invention3Sn conductor draws over to one's side the first, second, third sample schematic diagram after molding.
Fig. 3 is that the present invention utilizes infrared image progress pitch instrumentation plan.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, the non-destructive measuring method based on infrared thermal imaging on-line measurement hyperconductive cable back twist angle, including with
Lower step:
(1), it samples: firstly, choosing authentic specimen of one section of cable without wearing cable as without torsion when；Nb3Sn is led
Body wear cable it is molding during, due to the effect by tensile stress and compression, the back twist rate of cable be will increase, thus respectively
Cable Nb after molding is worn in selection3The straightway at Sn conductor both ends is as subsequent contrast's sample.As shown in Fig. 2, one section of front end conductor
Label is used as the first sample, while choosing the molding Nb of take-up3The continuous conductor in two sections of Sn conductor rear end is marked respectively as the
The length of two samples, third sample, the first sample, the second sample and third sample is consistent with authentic specimen length；
(2), infrared thermal imaging acquires image: Nb3When Sn conductor is powered on online, using infrared detector and optics at
As object lens receive Nb3The infrared radiation energy distribution pattern of Sn conductor, to obtain Nb3The Infrared Thermogram of Sn conductor, infrared heat
Pitch between each sub- cable is distinguished in the surface different temperatures region and conductor of conductor in image in different colors；
(3), it measures: according to the infrared image for the thermal-induced imagery neutron cable that step (2) obtains, measuring electric in the first sample
Pitch size d1, d2, d3 between the infrared image of cable keep identical measurement parameter, the second sample cable pitch of difference
Size d12, d22, d32 of size d11, d21, d31 and third sample cable pitch, as shown in Figure 3.
(4), it calculates cable pitch variation amount: step (3) being measured resulting as a result, being done respectively with the pitch of authentic specimen
Difference is denoted as Δ d finally using the average value of the difference of three samples as the variable quantity of pitch.
(5) it calculates cable back twist angle: according to the cable pitch variation amount Δ d in step (4), being calculated according to formula (1)
Cable back twist rate, that is, windup-degree out:
R is cable radius when back twist not occurring in formula (1).
Claims (1)
1. the non-destructive measuring method based on infrared thermal imaging on-line measurement hyperconductive cable back twist angle, it is characterised in that: utilize red
The heat distribution field of external detector and optical imaging objective acquisition when working online on tested hyperconductive cable, to obtain hyperconductive cable
Infrared Thermogram；Pitch between sub- cable will be shown in image with colour differentiation, utilize the infrared shadow between adjacent sub- cable
Picture measures its spacing, is compared by authentic specimen, can get the variable quantity of cable pitch, then can by correlation formula conversion
Back twist rate, that is, back twist angle of cable is obtained, specifically includes the following steps:
(1), it samples: choosing authentic specimen of one section of cable without wearing cable as without back twist when first；Nb3Sn conductor is being worn
During cable is molding, due to the effect by tensile stress and compression, the back twist rate of cable be will increase, therefore chooses wear respectively
Cable Nb after molding3The straightway at Sn conductor both ends is as subsequent contrast's sample；One section of front end conductor label is used as the first sample,
It chooses simultaneously and wears the molding Nb of cable3The continuous conductor in two sections of Sn conductor rear end is marked respectively as the second sample, third sample, the
The length of a sample, the second sample and third sample is consistent with authentic specimen length；
(2), infrared thermal imaging acquires image: Nb3When Sn conductor coils are powered on online, using infrared detector and optics at
As object lens receive Nb3The infrared radiation energy distribution pattern of Sn conductor, to obtain Nb3The Infrared Thermogram of Sn conductor, infrared heat
Pitch between each sub- cable is distinguished in the surface different temperatures region and conductor of conductor in image in different colors；
(3), it measures: according to the infrared image for the thermal-induced imagery neutron cable that step (2) obtains, measuring cable in the first sample
Pitch size d1, d2, d3 between infrared image, keep identical measurement parameter, measure the second sample cable pitch respectively
Size d12, d22, d32 of size d11, d21, d31 and third sample cable pitch；
(4), it calculates cable pitch variation amount: step (3) being measured resulting as a result, being made the difference respectively with the pitch of authentic specimen
Value, finally using the average value of the difference of three samples as the variable quantity of pitch, is denoted as Δ d；
(5), it calculates cable back twist angle: according to the cable pitch variation amount Δ d in step (4), electricity being calculated according to formula (1)
Cable back twist angle:
R is cable radius when back twist not occurring in formula (1).
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