CN101122639A - Austenitic stainless steel tube inner oxide magnetic damage-free detection device - Google Patents
Austenitic stainless steel tube inner oxide magnetic damage-free detection device Download PDFInfo
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- CN101122639A CN101122639A CNA2007101219942A CN200710121994A CN101122639A CN 101122639 A CN101122639 A CN 101122639A CN A2007101219942 A CNA2007101219942 A CN A2007101219942A CN 200710121994 A CN200710121994 A CN 200710121994A CN 101122639 A CN101122639 A CN 101122639A
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Abstract
A magnetic NDE device for oxides in austenitic stainless steel pipe pertains to the art of magnetic NDE technology, including a probe and a detection meter. The probe is connected with the detection meter provided with 2 to 8 signal channels through wires; the probe consists of an enclosed shell (1), a magnetic field sensor for detection (2) and a permanent magnet (4); the probe is provided with 2 to 8 magnetic field sensors for detection (2) arranged on one side of the internal cylindrical surface of the shell (1); each magnetic field sensor for detection (2) is provided with a strip-shaped permanent magnet (4) or all magnetic field sensors for detection (2) are provided with a public sheet permanent magnet; the magnetic filed built by the permanent magnet (4) magnetizes a strong magnetic oxide (6) possibly existing in a testing tube (5); the magnetic field sensor for detection (2) tests the strength of the stray magnetic field of the oxide (6) inside the tube from the external surface of the testing tube (5). The advantage of the device is being able to make accurate detection of the accumulated thickness of oxide inside the austenitic stainless steel pipe.
Description
Technical field
The invention belongs to the magnetic nondestructive testing field, a kind of magnetic damage-free detection device of austenitic stainless steel tube inner oxide particularly is provided, be used for Austenitic stainless steel pipe road inner oxide is carried out Non-Destructive Testing, particularly detect for the distribution situation of oxide in the pipe interior space.
Background technology
The Austenitic stainless steel pipe road that uses in the large-sized boiler is inwall generation oxidation in operational process.Because the difference of thermal expansivity is bigger between oxidation product and the steel pipe, when pipe temperature changed, oxide skin can be peeled off because of consequent thermal stress, and under under pipeline, depositing near the elbow.In order to guarantee the normal operation of boiler, need determine whether boiler tubing inside has oxide with lossless detection method, wish to know the distribution situation of oxide in managing again under many situations, particularly oxide on local location piling height, it is the degree of hole plug in the pipe in other words, so that the danger that oxide is caused is estimated.
A kind of magnetic lossless detection method and relevant detection device in ZL 03 1 09490.2, have been provided.In this detection method, apply the high-intensity magnetic field of steady in nonmagnetic Austenitic stainless steel pipe outside, with ferromagnetic oxide magnetization in the pipeline, the stray magnetic field signal that utilizes magnetic-field-sensitive element testing oxide to produce from the pipeline outside.Baseband signal on this detection signal and the oxide-free pipeline position is compared, and whether the existence of judgement pipeline inner oxide.But, the detection signal of this pick-up unit is along with the increase of pipe inner oxide ulking thickness is tending towards saturation value than more quickly.In case detection signal approaches its saturation value, just can not judge the ulking thickness of pipe inner oxide again by the intensity of detection signal.Effective detection thickness of existing pick-up unit has only about 10mm, still less than half of conventional utility boiler superheater tube internal diameter (generally all more than 20mm).Like this, when pipe inner oxide ulking thickness surpasses when effectively detecting thickness, existing pick-up unit no longer can effectively be judged the ulking thickness of pipe inner oxide.Rotate detection probe when judging the oxide piling height along the circumferencial direction of pipe, can judge by accident again in some cases.Cause the reason of erroneous judgement to be: the oxide skin that comes off from tube wall generally can move freely in pipe on the one hand; On the other hand, used more intense permanent magnet as its steady strong magnetic field source in the detection probe.Like this, when detecting the pipeline that tube wall is relatively thinner, caliber is smaller, in the detection probe rotation process, wherein keep the changeless U-shaped permanent magnet of relative position to move near the oxide in the pipe can being adsorbed on its magnetic pole with the magnetic-field-sensitive element, perhaps by detection probe near the pipe top directly is adsorbed onto its magnetic pole with oxide from the pipe bottom.This absorption has changed original distribution of pipeline inner oxide, causes the erroneous judgement to pipe inner oxide distribution situation.Such as, often use the Austenitic stainless steel pipe of external diameter in the boiler superheater as 42mm, when detecting with existing pick-up unit, detection probe can't be avoided the absorption of oxide.If pipe inner oxide ulking thickness reaches about 10mm, circumferentially rotate detection probe along pipeline, on each angle, all can obtain detection signal near saturation value, can't will manage inner situation about blocking fully with oxide and distinguish.
Use the gamma-rays detection method to carry out Non-Destructive Testing to the deposition of pipeline inner oxide, determine the distribution situation of oxide by image, its shortcoming is to use gamma-rays to bring irradiation hazard, influences other service works in the boiler.
Content of the present invention
The object of the present invention is to provide the magnetic damage-free detection device of austenitic stainless steel tube inner oxide.Utilize this cannot-harm-detection device, realized accurate judgement for pipe inner oxide ulking thickness, solved in the prior art because the saturated problem that can't judge that causes of detection signal has also solved detection probe and changed the problem of managing interior magnetic oxide distribution and causing erroneous judgement.
The present invention includes probe and measuring instrument.Probe is wired on the measuring instrument with 2～8 signalling channels.Wherein, probe is made up of with magnetic-field-sensitive element and permanent magnet package casing, detection.Detect and be packaged in the shell with magnetic-field-sensitive element and permanent magnet; Shell has can be closely attached on the face of cylinder of being examined on the tube wall; 2～8 detections interior face of cylinder one side of magnetic-field-sensitive component positioning shell is arranged in the probe, and each detects uses strip permanent magnet of configuration on the magnetic-field-sensitive element, perhaps is that detection is with disposing public flaky permanent magnet on the magnetic-field-sensitive element.During detection, will be examined the ferromagnetism oxide that may exist in the pipe by the magnetic field of the foundation of the permanent magnet in the probe and be magnetized, examined the intensity of outer surface of tube wall detection from the stray magnetic field of pipe inner oxide by the magnetic-field-sensitive element in the probe.
In the pick-up unit of the present invention, package casing is made by nonmagnetic substance, can fill any non-magnetic material in the space of its inner space.Thereby can fix with the relative position of magnetic-field-sensitive element and permanent magnet and shell detecting.(newly adding content)
In a kind of mode of pick-up unit of the present invention, 2～8 strip permanent magnets in the probe are being like pole on examined tube wall one side.
A kind of mode of pick-up unit of the present invention is that a compensation is installed on the other end of permanent magnet in the probe with the magnetic-field-sensitive element.Constitute differential output signal by the detection in the probe with the signal that magnetic-field-sensitive element and compensation are produced with the magnetic-field-sensitive element,, can reduce or eliminate and detect with signal at the bottom of the back of the body of magnetic-field-sensitive element as the detection signal of pick-up unit.
The another kind of mode of pick-up unit of the present invention is that compensation is contained in the measuring instrument with the permanent magnet of magnetic-field-sensitive element with configuration, constitutes a compensator.Like this, constitute differential output signal by the compensator of popping one's head in and be placed in the measuring instrument, reduction or elimination detect with signal at the bottom of the back of the body of magnetic-field-sensitive element, as the detection signal of pick-up unit.
Detect setting in the probe with the magnetic-field-sensitive element, preferably make its stray magnetic field that detects autoxidisable substance perpendicular to the radial component on the tube wall direction, also can detect this stray magnetic field with the pipeline component on angle certain direction in 0～75 degree scope radially.
The invention has the advantages that:
(1) pick-up unit of the present invention, by comprehensively judge the piling height of pipe inner oxide from the detection signal of the magnetic-field-sensitive element on the diverse location in the detection probe, overcome and relied on the detection signal of a magnetic-field-sensitive element in the detection probe in the prior art along with the saturated problem of bringing of change detection signal of managing the inner oxide ulking thickness, can the ulking thickness of Austenitic stainless steel pipe road inner oxide accurately be detected, the restriction of not managed inner oxide ulking thickness is particularly suitable for the judgement of the ulking thickness of oxide piling height when 10mm is above.
(2) utilize pick-up unit of the present invention can the ulking thickness of the Austenitic stainless steel pipe road inner oxide of all size accurately be detected, avoid in the detected probe of pipe internal cause oxide of small dimension that permanent magnet absorption is unsettled to cause erroneous judgement.
In addition, detection method of the present invention and device not only can be used for the magnetic inner oxide in the Austenitic stainless steel pipe road is detected, and also can detect the magnetic foreign body in other source.
Below embodiment by pick-up unit the present invention is illustrated.Working condition when as a comparison, an embodiment who has provided the pick-up unit of prior art detects.
Description of drawings
Photo when Fig. 1 probe of the prior art detects wherein, is that 42mm, wall thickness are that the stainless-steel tube of 6mm will manage inner oxide when detecting and be adsorbed to external diameter, causes the oxide ulking thickness to judge by accident.(Comparative Examples)
The embodiment of one four probe is in the synoptic diagram on the detection position among Fig. 2 the present invention.Wherein, one side of something 5 of shell 1, detection magnetic-field-sensitive unit 2, compensation magnetic-field-sensitive element 3, strip permanent magnet 4, tested pipe, the interior oxide 6 of pipe.
Fig. 3 probe shown in Figure 2 is for the detection family curve of pipe inner oxide piling height.s
1～s
4The detection signal at four check point places that is probe respectively is along with the change curve of pipe 5 inner oxides 6 piling heights, and these four signals compensate with differential form with magnetic-field-sensitive element 4 with magnetic-field-sensitive element 2 and through over-compensation from from bottom to top four detections in the probe.
Fig. 4 one three spot check probing embodiment synoptic diagram of the present invention.Wherein, 1 is shell, and 2 are detection magnetic-field-sensitive element, and 3 is that the magnetic-field-sensitive element is used in compensation, and 4 is strip permanent magnet.
Fig. 5 one two spot check probing embodiment synoptic diagram of the present invention.Wherein, shell 1, detection magnetic-field-sensitive unit 2, compensation magnetic-field-sensitive element 3, strip permanent magnet 4.
Embodiment
Photo when the pick-up unit of the prior art that has provided ZL 03109490.2 among Fig. 1 detects, the external diameter of wherein being examined pipe is the stainless-steel tube of 42mm.The detection signal that this pick-up unit provides effectively detects thickness and generally is no more than 10mm along with the increase of pipe inner oxide piling height more promptly is tending towards saturated.In order to judge the ulking thickness of pipe inner oxide, need sometimes around being examined pipeline rotation detection probe.Fig. 1 shows: when detection probe was in the pipe top, the oxide in the pipe was popped one's head in adsorbed, made that the pipe inner oxide no longer is the NATURAL DISTRIBUTION state that is tiled in the pipe bottom.Still obtain very strong detection signal when at this moment, pick-up unit detects at the pipe top.Thus we draw probably in the pipe oxide fill full, be the wrong conclusion that the complete oxide of pipe interior xsect blocks.
Figure 2 shows that the structural representation of a kind of probe in the pick-up unit of the present invention.Probe among the figure is on the position that the examined pipe 5 to horizontal positioned detects, and has wherein only provided and has been examined the part that pipe 5 is positioned at probe one side, in the pipe 5 oxide 6 is arranged.Detection probe is made up of with magnetic-field-sensitive element 2 and permanent magnet 3 shell 1, detection.Shell 1 has the circular bottom profile of part, and the arc diameter on the inboard face of cylinder and the external diameter of detected pipe are complementary, so that cling on the wall of being examined pipe 5 when detecting, gap between the two is smaller as far as possible.In the probe, near equally spaced having settled on the circumference at its inner arc edge four detections with magnetic-field-sensitive elements 2, such as Hall element, its setting makes its stray magnetic field that detects oxide 6 perpendicular to the radial component on the tube wall direction.Detect with strip permanent magnet 4 of magnetic-field-sensitive element 2 configurations for each in the probe.Along the strip permanent magnet 4 of its longitudinal magnetization, along radially settling radially.Their same pole, all be arranged near the inboard face of cylinder of probe such as all N utmost points (perhaps its all S utmost point).Also has compensation magnetic-field-sensitive element 3 in the probe, it is near the outer ledge of shell 1, away from the detection of examined pipe 5 bottoms magnetic-field-sensitive element 2 public strip permanent magnets 4, the two is placed in respectively near two terminations of permanent magnet 4 during with detection.Selection by polarity makes compensation offset with magnetic-field-sensitive element 2 with detection with the output of magnetic-field-sensitive element 3, realize detecting compensation in differential mode, thereby reduce or eliminate and detect with signal at the bottom of the back of the body of magnetic-field-sensitive element 2 with magnetic-field-sensitive element 2 output valve in the magnetic field of permanent magnet 4.Also be furnished with the supply line and the output signal lead line of all magnetic-field-sensitive elements that do not provide among the figure in the probe, be connected with the measuring instrument of pick-up unit by lead, come out from four detections of the probe detection signal of magnetic-field-sensitive element 2 after over-compensation by measuring instrument while detection by quantitative.
Inner oxide 6 piling heights that Figure 3 shows that the Austenitic stainless steel pipe 5 that probe is internal, external diameter is respectively 35mm and 55mm, wall thickness 10mm among Fig. 2 detect the detection family curve that obtains.It by from from bottom to up the detection signal of four detecting elements 2 in the probe along with the change curve s of pipe 5 inner oxides 6 from the piling height (thickness just) of managing 5 bottoms and beginning
1, s
2, s
3, s
4Form.
From detection family curve shown in Figure 3, can see: when oxide 6 ulking thickness are no more than 10mm in the pipe 5, the detection that is positioned at the probe bottommost increases sharply with the output signal of magnetic-field-sensitive element 2, very sensitive for pipe 5 inner oxides 6 piling heights, and the approximate between the two linearity that is, see curve s among the figure
1Can draw the piling height of oxide 6 in pipe 5 thus by the intensity of detection signal.But, the piling height of managing 5 inner oxides 6 is above behind the 10mm, and the detection of bottommost begins to be tending towards saturated with the detection signal of magnetic-field-sensitive element 2, has lost the sensitivity for pipe 5 inner oxides 6 piling heights.So effective detection altitude range of detecting element 2 is 0 to 10mm in the probe.
Along with oxide 6 piling heights in the pipe 5 increase, the S-shaped increase of detection signal that two detecting elements 2 in the probe on the centre position produce almost is the linear relation that increases in certain middle piling height scope of oxide 6, see curve s among Fig. 3
2, s
3, therefore form effectively detecting separately for pipe 5 inner oxides 6 piling heights.Wherein, second detection that makes progress from the bottom is piling height scopes of about 7.5mm to 15mm with the valid analysing range of magnetic-field-sensitive element 2, and the 3rd detection that the bottom makes progress is 10mm to 27.5mm with the valid analysing range of magnetic-field-sensitive element 2.Equally, manage 5 inner oxides, 6 piling heights when exceeding certain limit, two middle detections lose susceptibility for the oxide piling height with the output signal of magnetic-field-sensitive element 2, such as, manage 5 inner oxides, 6 piling heights when being respectively about 20mm and 30mm, second and the 3rd detection that makes progress from the bottom is with output signal value of reaching capacity of magnetic-field-sensitive element 2.
Oxide 6 piling heights reach 20mm when above in pipe 5, and the output signal that is in the detecting element 2 of the top in the probe begins obvious enhancing, sees curve s among the figure
4Oxide 6 piling heights reach 25mm when above in pipe 5, and detection signal increases near linear with oxide 6 piling heights, reach maximum 35mm, be about to manage 5 and all fill up up to pipe 5 inner oxides 6 piling heights.And the detection of the top output signal s of magnetic-field-sensitive element 2
4For almost not response of the oxide 6 of piling height below 15mm in the pipe 5.Therefore, the detection of the top can be for the valid analysing range of pipe 5 inner oxides 6 piling heights in 25mm to 35mm scope with magnetic-field-sensitive element 2, just the oxide 6 piling height sensitivities to managing 5 tops.
The intensity distributions situation of the detection signal that four detections that provide according to probe provide with magnetic-field-sensitive element 2 can accurately be judged oxide 6 piling heights on the xsect of the residing pipe 5 of pipeline 4 inherent detection probe.Each detects with magnetic-field-sensitive element 2 separately effective detection altitude range, and the different valid analysing ranges that detect with magnetic-field-sensitive element 2 have overlapping mutually, and their whole valid analysing range then covers to be examined manages 5 entire inner diameter height.
Below to use probe shown in Figure 2 to be example, detection method of the present invention is described.
According to relative position relation shown in Figure 2, be posted by the inboard face of cylinder of probe on the outer wall of being examined pipe 5 from the side of being examined pipe 5, detection in the probe is on certain longitudinal cross-section of stainless-steel tube 5 with magnetic-field-sensitive element 2, formation is to locational four check points of differing heights on the side of being examined pipe 5, and they are distributed in equally spacedly detects near the outer surface of tube wall.Provide the detection signal strength at four check point places respectively with magnetic-field-sensitive element 2 by these four detections.Known detection family curve s by these 4 detection data and probe shown in Figure 3
1, s
2, s
3, s
4Contrast, judge examined pipe 5 inner oxides 6 existence whether and piling height.Following several situation specifically may appear.
First, if in the probe each to detect with magnetic-field-sensitive element 2 given detection signals all be its zero output signal (just pop one's head in and manage on 5 certain output signal can confirm that inside does not have on the position of oxide 6 time), with the stray magnetic field of oxide 6 is that zero situation is corresponding, and can confirm thus to manage does not have oxide 6 in 5.
Second, detection in probe all is that zero-signal or numerical value are when very low with magnetic-field-sensitive element 2 given detection signals, and when the detecting element 2 of below detects oxide 6 and mainly has been higher than its zero-signal by the detection signal of the stray magnetic field that provides after permanent magnet 4 magnetization, the detection family curve s that can provide by Fig. 3
1, draw the piling height of oxide 6 in pipe 5.Wherein, should be noted that: the effective value of oxide 6 ulking thickness is in 0～10mm scope in the pipe 5 that obtains like this.
The 3rd, if pop one's head in the given detection signal, not only the detection of bottommost is bigger with the detection signal that magnetic-field-sensitive element 2 provides, and the second even the 3rd the signal value that makes progress from the bottom detects the detection signal that provides with magnetic-field-sensitive element 2 also all than higher, especially the detection of bottommost has reached with the detection signal of magnetic-field-sensitive element 2 or during near its saturation value, and the detection of topmost is with the detection signal of magnetic-field-sensitive element 2 when very low, exists the piling height of oxide 6 to rely on detection family curve s shown in Figure 3 respectively in the pipe 5
2Or/and s
1, or s
3And/or s
2Calculate.Attention: utilize second, third effective range that oxide 6 piling heights of the detection signal calculating that provides with magnetic-field-sensitive element 2 are provided that makes progress from the bottom to be respectively 7.5mm～15mm and 10mm～27.5mm.
The 4th, if four detections in the probe are with in the given detection signal of magnetic-field-sensitive elements 2, three given detection signals of bottom are all near its saturation value, and the signal value that uppermost detection provides with magnetic-field-sensitive element 2 is also than higher, oxide 6 piling heights are very big in the pipe 5, rely on detection family curve s shown in Figure 3
4And/or s
3Calculate oxide 6 piling heights.Utilize s
4The effective range of oxide 6 piling heights of calculating is at 25mm to 35mm.
Observation for actual detected shows: permanent magnet 4 does not cause oxide 6 whole moving substantially for the attractive force of being examined oxide 6 in the pipe 5 in the probe, just near the inner surface of tube wall of probe place one side, cause a small amount of oxide on chip 6 to change distribution a little, the magnetic line of force direction of the magnetizing field on the present position of just its sheet plane being tried one's best is parallel, almost not displacement.Probe from manage remove near 5 walls after, oxide 6 almost completely recovers ortho states.Therefore, during detection, probe does not make pipe 5 inner oxides 6 distributional patterns change.Reason is: at first compared with prior art, use bar-shaped magnet 4 in the probe of the present invention, pass through with the layout of magnetic pole in a side, avoid using the U-shaped permanent magnet, therefore can not form bridge joint by absorbing oxide, thereby alleviate managing the adsorption of 5 inner oxides 6 in the part of tube wall; The second, the permanent magnet 4 of probe bottom will be managed 5 inner oxides 6 and will be adsorbed on the original position, add the effect of oxide 6 self gravitations, and the permanent magnet 4 on probe top can not be adsorbed onto higher position with oxide 6 and get on; The 3rd, no longer need be in the testing process along the circumferential mobile probe of being examined pipe, therefore the permanent magnet in the probe can be from absorbing oxide 6 on the lower height and position, be carried to the higher position again and get on.Like this, detection probe changes the problem of managing the inner oxide distribution and causing erroneous judgement in the prior art with regard to having avoided.
Use pick-up unit of the present invention, longitudinal translation detection probe along examined pipe 5, on the xsect of record different longitudinal position with pipe 5 inner oxides, 6 stray magnetic field signals corresponding detection signal, along with the variation of piling height in detector segments that the variation of lengthwise position can draw pipe inner oxide 6, determine to be examined the distribution situation of the oxide 6 of pipe 5 in detector segments from detection signal thus.Actual observation shows: detection probe abuts on pipeline 4 sides when vertically moving, the oxide 6 of scale just in time is in when certain permanent magnet pole is neighbouring in the probe in the pipe 5, can be varied to the state vertical by original attitude, and permanent magnet is removed the original form of back recovery with inside pipe wall.Detection probe can't adsorption tube 5 inner oxides 6 moves together, and this may be because the oxide 6 of powdery or sheet is subjected to the cause that other oxides hinder or influenced by the frictional resistance of tube wall.So in the testing process, probe does not influence for the distributional pattern of the oxide 6 in the pipe 5, thereby avoids the distribution situation of managing 5 inner oxides 6 is caused erroneous judgement.
Figure 4 shows that the embodiment of one three spot check probing head of the present invention.Probe has three detections with magnetic-field-sensitive element 2, has correspondingly disposed three strip permanent magnets 4.Detect and be spacedly distributed with magnetic-field-sensitive element 2.Probe has a public compensation magnetic-field-sensitive element 3.After the detection family curve of this probe has been determined in test in advance, adopt the similar of method that this probe detects and above-mentioned four points probing head, repeat no more.
Fig. 5 has provided one two a spot check probing embodiment of the present invention, can be used for the piling height of the Austenitic stainless steel pipe inner oxide of less caliber is detected.Probe has two detections with magnetic-field-sensitive element 2, has correspondingly disposed two strip permanent magnets 4.Probe has a public compensation magnetic-field-sensitive element 3.Use the detection method of detection probe, similar with above-mentioned probe, wherein, the detection signal that detection probe provides simultaneously calculates the piling height of managing inner oxide with predetermined detection family curve contrast.
Pick-up unit of the present invention is not limited to the foregoing description.In framework of the present invention, can be by changing employed material of permanent magnet and the magnetic property rank thereof in the probe, change shape or its relative setting of permanent magnet, such as with strip permanent magnet arrangement parallel to each other, and change detects the direction with magnetic-field-sensitive magnetic-field component that element detects, change permanent magnet and detect the relative position relation of using between the magnetic-field-sensitive element, obtain various realizations pick-up unit of the present invention and become example.
Claims (5)
1. a magnetic damage-free detection device comprises probe and measuring instrument, it is characterized in that, probe is wired on the measuring instrument with 2～8 signalling channels, and probe is made up of with magnetic-field-sensitive element (2) and permanent magnet (4) package casing, detection; Detect and be packaged in the shell (1) with magnetic-field-sensitive element (2) and permanent magnet (4), shell (1) has can be closely attached on the face of cylinder that is subjected on inspection pipe (5) wall, there are 2～8 detections to settle the interior face of cylinder one side of shell (1) in the probe with magnetic-field-sensitive element (2), each detects with magnetic-field-sensitive element (2) and goes up a configuration strip permanent magnet (4), perhaps goes up the public flaky permanent magnet of configuration for all detect with magnetic-field-sensitive element (2); The magnetic field magnetisation of being set up by permanent magnet (4) is subjected to inspection to manage the ferromagnetism oxide (6) that may exist in (5), by detecting with magnetic-field-sensitive element (2) in the intensity that is subjected to the detection of inspection pipe (5) wall outside surface from the stray magnetic field of pipe inner oxide (6).
2. pick-up unit as claimed in claim 1 is characterized in that, the shell of probe (1) is made by nonmagnetic substance, fills non-magnetic material in the internal voids.
3. pick-up unit as claimed in claim 1 is characterized in that, 2～8 strip permanent magnets (4) in the probe are being like pole on examined pipe (5) wall one side.
4. pick-up unit as claimed in claim 1 is characterized in that, a compensation is installed in the other end of permanent magnet (4) with magnetic-field-sensitive element (3), perhaps will compensate with magnetic-field-sensitive element (3) to be placed in the measuring instrument with permanent magnet (4).
5. pick-up unit as claimed in claim 1 is characterized in that, detects the setting with magnetic-field-sensitive element (2) in the probe, make its stray magnetic field that detects autoxidisable substance (6) with the pipeline component of angle on 0～75 degree direction radially.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101219942A CN100533176C (en) | 2007-09-19 | 2007-09-19 | Austenitic stainless steel tube inner oxide magnetic damage-free detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101219942A CN100533176C (en) | 2007-09-19 | 2007-09-19 | Austenitic stainless steel tube inner oxide magnetic damage-free detection device |
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| CN101122639A true CN101122639A (en) | 2008-02-13 |
| CN100533176C CN100533176C (en) | 2009-08-26 |
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