CN1836150A - Waveguide - Google Patents
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- CN1836150A CN1836150A CN 200480023348 CN200480023348A CN1836150A CN 1836150 A CN1836150 A CN 1836150A CN 200480023348 CN200480023348 CN 200480023348 CN 200480023348 A CN200480023348 A CN 200480023348A CN 1836150 A CN1836150 A CN 1836150A
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- waveguide
- position transducer
- aforementioned arbitrary
- coil
- magnetic test
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Abstract
The invention relates to position sensors, especially the detector unit thereof. The aim of the invention is to simplify one such position sensor such that, in spite of significantly low production costs, the function thereof is ensured with sufficient precision. During the use of an electroconductive waveguide that is also used as an electrical conductor, and when the detector coil is coaxially arranged directly on the electrical conductor and a corresponding shield is especially arranged around the detector coil, especially in the form of a flux concentrating piece, the useful signal is sufficiently different to the existing interfering signals, especially when the shield surrounds the detector coil as tightly as possible. The inventive position sensor operating according to the propagation time principle of a mechanical-elastic wave comprises a waveguide (3), a detector coil (5) arranged on the waveguide (3), and a positioning element, e.g. a positioning magnet (28), that can be displaced along the waveguide (3). Said position sensor is characterised in that the waveguide (3) consists of electroconductive material, and the detector coil (5) is arranged coaxially in relation to the waveguide (3) in the detector region.
Description
Technical field
The present invention relates to position transducer, particularly the detector module of position transducer.The principle that this detecting device was measured based on the travel-time of the mechanical elasticity pulse in the waveguide, except that waveguide, the present invention also comprises the relatively movably position element that produces or detect mechanical elastic wave.
Background technology
Waveguide is made up of electron tube, tinsel or ribbon usually, can also be used as electric conductor.Waveguide can be arranged on given form, linear or annular as in plastics or the metallic object, be used for sealing and suspended waveguide pipe.
According to Wiedemann (Wiedemann) effect, the electric current and the external magnetic field that flow into waveguide are stacked, and the side, external magnetic field is towards magnetostrictive waveguide.Electric current is risen in a setting element, and particularly a location magnet produces reversing of mechanical elasticity ripple, and this reverses with 2,500m/s-6, and the speed of 000m/s is propagated by the position of playing source position or setting element, as does not have the waveguide direction of both ends to propagate.
A position, at an end of waveguide, utilize sensor module to detect reversing of mechanical elastic wave usually, sensor module mainly is fixed on the relevant position of waveguide.Utilize the displacement of sensor device measurement and positioning element, thereby can draw the time span that discharges between exciting current and the reception mechanical pulsing by phase magnet or coil or electromagnet.
Typical this sensor is described in the United States Patent (USP) 896714.
The principal focal point of this invention is pick-up unit.This pick-up unit comprises a magnetic test coil, its promptly can be arranged at waveguide around, also can be arranged at around Weiler auspicious (Villary) frequency band and as so-called Weiler auspicious (Villary) detecting device.This pick-up unit is with 90 ° angle that diagonal line stretches out by waveguide and specifically is connected with waveguide in the form of the mechanical fixation mode as welding.Torsional pulses is moved the longitudinal wave that is converted on Weiler auspicious (Villary) frequency band along waveguide, and therefore this longitudinal wave elastic compression or prolongation change its magnetic permeability mu at the Weiler of lattice wave spectrum auspicious (Villary) frequency band.For this purpose, Weiler auspicious (Villary) frequency band is made up of as nickel or nickel alloy the material with high as far as possible magnetoconductivity Δ μ.
A kind of magnetoelasticity parts show that by Weiler auspicious (Villary) frequency band himself being in voltage floats among the Δ U as density wave, and it can be tapped as the information signal at magnetic test coil.
Obviously, information signal Δ U is big more, and the changes delta mu of the magnetoconductivity that obtains is also big more.
In addition, this scope of curve Δ μ (H) is desirable as the magnetoconductivity of operating point or opereating specification or sign above magnetic field intensity, wherein, magnetoconductivity Δ μ is to be linear as much as possible with respect to target, but change and be strong as much as possible, just function Δ μ (H) should be developed in leading edge and is precipitous as much as possible, and why opereating specification should be based upon near linear scope.
In the explanation of prior art, so-called magnetic bias is that the form with permanent magnet is arranged in the space near magnetic test coil, is used for the adjustment of operating point, and is parallel as auspicious with Weiler (Villary) frequency band.
The operating point of magnetoelasticity pick-up unit depends primarily on its position with respect near the inspection lateral coil the magnetic parameter of magnetic bias.
In many aspects, this is harmful to, for example, the occasion of sensor is being set, can be subjected to the particularly dynamics mechanical stress of machinery and wearing and tearing or even quicken the heat bump, it changes the magnetic parameter of magnetic bias, its ageing process particularly, the result equally also has the variation of magnetic parameter.
In addition, depart to come from all of object form and prepare magnetic bias in an identical manner, that is, in the process of making magnetic bias, all be suitable for identical application for the variation of the production requirement of magnetic parameter.
Another shortcoming is, if phase magnet is too near near magnetic test coil, operating point is negative value to be changed.According to the explanation of prior art to detecting operation, therefore, in order to reduce electromagnetic interference (EMI) to controllable degree, waveguide must extend to is enough to surpass measurement range.Therefore yet the length overall of the alignment sensor that forms is obviously greater than its measurement range.
The design of prior art mainly is dispersed in by waveguide and is Weiler auspicious (Villary) frequency band that diagonal line stretches out, and its detected coil is packaged, realizes its effect based on high amplitude.This technology has the shortcoming of complicate fabrication process.
Utilize waveguide self to have solid cross section and can be used as conductor or have hollow cross-section and be common method in the past as conduit.Can also use waveguide as a kind of electric conductor.Aforementioned forms is useful, because in the inside of tubular type electric conductor, lacks the magnetic field that is produced by electric current.
Empty in the invention
A) technical assignment
Effect of the present invention is a position transducer of simplifying this aufbauprinciple, and makes it when obviously reducing production costs, and guarantees accurate fully effect.
A) solution of task
The solution of task of the present invention is that advantageous embodiments result is from appended claims by the feature of claim 1 and 8.
Regardless of how expecting, definite, when using the waveguide of conduction, its has the coaxial configuration of direct magnetic test coil on electric conductor and the structure of the corresponding shielding around the magnetic test coil simultaneously as electric conductor.Particularly, with the form of direct traffic parts, particularly when shielding as far as possible tightly around magnetic test coil, information signal distinguishes over existing undesired signal fully.
In this case, the current feed of magnetic test coil can not be exempted, but would rather thisly may have negative influence, after sensor is energized, can save the compensation of the temperature variation between detector array.
Therefore, detector coil is axially set in the end scope of thread waveguide, before or after, shielding is provided, particularly utilize same cylindrical flow guide piece.After magnetic test coil is affixed to testing circuit-suitably behind the suspended waveguide pipe, but operation sensor.
Select the setting and the form of the relative magnetic test coil of direct traffic device, so that the flow path that is started by the direct traffic device is especially at one deck at least, especially at least one axial layer, around the coil winding of whole magnetic test coil.Preferably, the magnetic test coil encapsulation does not have the flow path of interference.
For reaching this effect, the form of flow conductor part can structurally change.
In a simple embodiment, axial overlap is applied in the waveguide at the C-of magnetic test coil shape flow conductor part, so as C part with less distance directly near the two ends of the free end and the coil of waveguide.Thereby by the small air gap between waveguide and the direct traffic parts, this air gap is represented the magnetic current path, is started by the direct traffic parts from the appropriate section of all magnetic circuits of C-shape direct traffic parts and waveguide.
Though most magnetic test coil is positioned at the outside of this magnetic circuit, the signal quality of the electric signal of being carried by magnetic test coil has obtained increasing powerfully.
The additional effect that the present invention improves is to utilize the magnetic current path, makes the magnetic test coil of winding be positioned at total energy raising measurement effect.As being distributed on the waveguide along its length by two C-shape direct traffic parts or the more C-shape direct traffic parts that opposition is set.
Desirable situation is the corresponding direct traffic body package detection coil that forms-except the import and outlet of needs, encapsulate fully as much as possible.Thereby the direct traffic body is made up of the casting mold of two complementations usually.
Even so, can replace or replenish the measurement of above stated specification, if the electric loop of alignment sensor necessity be arranged on magnetic test coil around, at least in the zone of magnetic test coil, especially in tubular type, be preferably in the sealing of broad range in any case, also can realize the improvement of the information signal of relative undesired signal.
Use when the loop and to be not only conduction, but also when being the material of magnetic shielding, can make effect of the present invention more special, its magnetoconductivity is μ＞1.
C) embodiment
Describe embodiments of the invention in detail in conjunction with example given below.
Fig. 1 is the synoptic diagram according to position transducer of the present invention
Fig. 2 represents the xsect by waveguide 3
The additional design of Fig. 3-6 expression direct traffic device
Fig. 1 represents whole position sensor, and this sensor is included in the waveguide 3 of direction of measurement, With it on checkout gear 105 and the testing circuit 50 that is connected with checkout gear 105.
Need not contact, but position transducer measurement and positioning magnet 28 along on the direction of measurement 10 of waveguide assembly with respect to the sensor head of waveguide 3, or until the position of moving of magnetic test coil 5.
As shown in Figure 2, at least in the subregion, the solid cross section exterior contour that waveguide 3 shows particularly surpasses its length overall preferably ringwise.
For example, in it advance, waveguide 3 is accommodated in the stay pipe 4, stay pipe 4 has the outer dia of obviously big inside diameter as waveguide 3, form dividing plate 2 by being provided with of a flexible pipe, dividing plate is more preferably plastics especially and is formed by non-conductive and material non-magnetic conduction, be axially disposed within the waveguide 3 that has stay pipe 4 around.
The free end of waveguide 3 is away from the detection head of facing, thereby magnetic test coil 5 is accommodated in the damping device of a special use.
At magnetic test coil 5, coil can be the stratiform diagonal line and be arranged at vertically 10, maybe can also construct magnetic test coil 5 for annular-longitudinally 10 are stratiform.
In this case, direct traffic device 30 as shown in Figure 1a, can comprise two and half shells, connects the plane parallel with longitudinal direction 10 or forms cup-shaped housing with preceding overlay, shown in Fig. 1 b.
Even the design of the opening surface of two shellies direct traffic device respect to one another 30c also may be at the contact plane 30c of two hull shape parts, shown in longitudinal sectional drawing and front view (FV) among Fig. 6, wherein waveguide is passed hull shape part 30c and is passed the closed bottom that central waveguide opening 5a or 5a ' enter the hull shape part, and being electrically connected of coil 5 makes the inside of direct traffic device by the opening that can not see here.
Opposite with foregoing variation, direct traffic device 30 in this variant, except passing the opening of being electrically connected, surround inductive coil 5 and waveguide 3 as best one can fully, illustrate side and positive solution among Fig. 3-5, wherein the direct traffic device comprises one or more C shape conductance element 30a or 20b, so it not exclusively surrounds inductive coil 5.
In the simple workaround according to Fig. 3, C shape conductance element 30a use to connect longitudinal rod and installs at longitudinal direction 10 or the direction that is parallel to waveguide 3, two free end directions of C shape part 30a are towards the both sides of the front end of inductive coil 5, against waveguide 3 and conductance element 30a like this.
According to Fig. 4, two such C shape part 30a correspondingly are arranged on the side of waveguide 3, and each other over against placement, so whole inductive coils 5 are in the direct traffic device 30, but are not fully tightly to be surrounded by it.
By increasing the quantity of this C shape part 30a along length distribution, three C shape part 30a as shown in Figure 5, the perhaps C shape part of greater number, conductance element do not have the coverage of the inductive coil 5 that covers to become littler, and therefore the signal quality by the inductive coil transmission strengthens greatly.
Figure 4 shows that two C shape conductance element 30b of modification, they are not arranged in the housing of two sides of waveguide in this case, but the waveguide openings 5a of the connecting link by being positioned at C shape part 30b is wired to waveguide 3, the free end bar of direct traffic element and need contact with each other toward each other.
According to the side view shown in Fig. 4 d, can see that in side view or cross-sectional view inductive coil 5 is flexible, and the coil chassis is not empty on H shape coil chassis 1, expression self-supporting inductive coil 5 in other accompanying drawings.
In two relative skeleton views, Fig. 4 c is depicted as not the side of the inductive coil 5 that is covered by the direct traffic body, and the correspondingly connection of inductive coil 5 can be drawn from the direct traffic body covers.
In addition, Fig. 1 c illustrates a solution, and the coaxial inductive coil 5 that wherein is arranged in the waveguide 3 is not surrounded by the direct traffic device, but is surrounded by coaxial, tubulose, the electric loop that are provided with around inductive coil 5.This effect especially appears at material not only for conduction, and when having magnetic shield character, so unit permeance μ＞1.
In addition, the magnetic field from external impact inductive coil 5 is shielded in the outside by this means.
Two kinds of possibilities also capable of being combined, the direct traffic device that has described characteristic in other words adds coaxial loop 6.
The device assembly tabulation:
1 chassis
2 support flexible pipe
3 waveguides
4 stay pipes
5 magnetic test coils
5a, 5a ' waveguide openings
The 5b connection opening
6 loops
7 vibration absorbers
10 is vertical
28 phase magnets
29 flow coupling arrangements
30a C-shape direct traffic parts
30b C-shape direct traffic parts
30c hull shape direct traffic parts
50 estimate circuit
105 pick-up units
Claims (26)
1. position transducer is followed mechanical elasticity wave propagation time principle, has
-waveguide (3),
-be arranged in the magnetic test coil (5) on the waveguide (3),
-one location parts, as a location magnet (28), it can be moved along waveguide (3), it is characterized in that,
-waveguide (3) is made up of conductive material,
-magnetic test coil (5) is axially disposed within sensing range on the waveguide (3).
2. according to the position transducer of claim 1, it is characterized in that magnetic test coil (5) is set in a flow guide piece (30).
3. position transducer is followed mechanical elasticity wave propagation time principle, has
-waveguide (3),
-be arranged in the magnetic test coil (5) on the waveguide (3),
-one location parts, as a location magnet (28), it can be moved along waveguide (3), particularly in aforementioned arbitrary claim, it is characterized in that in the axial range of magnetic test coil (5), electric loop (6) are axially disposed within the exterior circumferential of magnetic test coil (5) at least.
4. according to the position transducer of aforementioned arbitrary claim, it is characterized in that waveguide (3) has solid cross section.
5. according to the position transducer of aforementioned arbitrary claim, it is characterized in that the xsect that runs through the waveguide (3) of whole measurement range is a solid.
6. according to the position transducer of aforementioned arbitrary claim, it is characterized in that the detecting device (5) or the part of pick-up unit are as a testing circuit (50).
7. according to the position transducer of aforementioned arbitrary claim, it is characterized in that, set the direct traffic device (30) of magnetic test coil (5), so that its shield detection coil (5) and resist undesirable external magnetic field simultaneously.
8. according to the position transducer of aforementioned arbitrary claim, it is characterized in that the magnetic current path of being enabled magnetic flux by direct traffic device (30) comprises at least one time coil winding, particularly in the flow path, comprise waveguide (3).
9. according to the position transducer of aforementioned arbitrary claim, it is characterized in that the flow path that is started by direct traffic device (30) is around whole winding, especially at one deck at least, especially at least one axial layer, wound coil fully.
10. position transducer according to Claim 8 is characterized in that, loop (6) are made up of the magnetic shielding material that reaches of conduction, and its magnetoconductivity is μ＞1.
11. the position transducer according to claim 9 is characterized in that, loop (6) demonstrate as far as possible widely, particularly the xsect of complete closed.
12. the position transducer according to aforementioned arbitrary claim is characterized in that, shielding, particularly direct traffic device (30), and local at least package detection coil (5), particularly along one deck of magnetic test coil (5), an axial layer axially encapsulates.
13. the position transducer according to aforementioned arbitrary claim is characterized in that, magnetic test coil (5) is configured to not have the self-supporting coil of coil housing.
14. the position transducer according to aforementioned arbitrary claim is characterized in that, magnetic test coil (5) is wrapped on the coil housing, particularly on the coil housing of the H of longitudinal view shape.
15. position transducer according to aforementioned arbitrary claim, it is characterized in that, shielding, particularly direct traffic device (30) be package detection coil (5) fully, except the opening (5a) of waveguide (3) and be used for guide openings (5b) that electric conductor is connected with magnetic test coil (5) at least.
16. position transducer according to aforementioned arbitrary claim, it is characterized in that, direct traffic device (30c) is mainly hull shape, particularly has the cylindrical of two openings, the front side (5a, 5a ') that the opening of two opposition is positioned at sealing is used for the entrance and exit of waveguide (3), and ((5b) is used for the electric conductor by magnetic test coil (5) to the conductor mouth, wherein, conductor mouth (5b) is arranged on the cyclindrical surface region of direct traffic device (30) especially.
17. the position transducer according to aforementioned arbitrary claim is characterized in that, columniform direct traffic device (30) comprises cup shell and unlimited front portion and the suitable capping that covers preceding bead.
18. the position transducer according to aforementioned arbitrary claim is characterized in that, cylindrical housings is made up of two semi-cylindrical shells.
19. the position transducer according to aforementioned arbitrary claim is characterized in that, direct traffic device (30) is made up of ferromagnetic material, and its magnetoconductivity is μ＞10, particularly μ＞1,000, particularly μ＞10,000.
20. the position transducer according to aforementioned arbitrary claim is characterized in that, direct traffic device (30) particularly is made up of from ferritic Alperm Alperm.
21. the position transducer according to aforementioned arbitrary claim is characterized in that, the electric current of process waveguide (3) is a direct current.
22. the position transducer according to aforementioned arbitrary claim is characterized in that, pick-up unit (105) does not comprise any magnet, does not particularly comprise magnetic bias.
23. the position transducer according to aforementioned arbitrary claim is characterized in that, the vertical consistency of the axial and waveguide (3) of magnetic test coil (5).
24. the position transducer according to aforementioned arbitrary claim is characterized in that, magnetic test coil (5) is a toroid winding.
25. the position transducer according to aforementioned arbitrary claim is characterized in that, toroidal length is at least corresponding to the diameter of its free center mouth (5a), preferably at least greater than twice.
26. position transducer according to aforementioned arbitrary claim, it is characterized in that, toroid winding is packaged by direct traffic device (30), it has, and some are cylindrical and preferably be made up of two and half housings, each half housings close is in the front side, except central passage (5a), be similar to toroidal passway, toroidal contact layer is the diagonal angle operation for toroidal longitudinal axis and direct traffic device (30).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10337455.8 | 2003-08-14 | ||
| DE10337455 | 2003-08-14 | ||
| DE10344628.1 | 2003-09-25 | ||
| DE10351650.6 | 2003-11-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1836150A true CN1836150A (en) | 2006-09-20 |
Family
ID=37003314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200480023348 Pending CN1836150A (en) | 2003-08-14 | 2004-08-12 | Waveguide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1836150A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102265120A (en) * | 2009-01-02 | 2011-11-30 | Asm自动化传感器测量技术有限公司 | Sensor according to the propagation time principle having a detector unit for mechanical-elastic density waves |
| CN104583729A (en) * | 2012-08-14 | 2015-04-29 | 保险丝公司 | Extended stroke position sensor |
-
2004
- 2004-08-12 CN CN 200480023348 patent/CN1836150A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102265120A (en) * | 2009-01-02 | 2011-11-30 | Asm自动化传感器测量技术有限公司 | Sensor according to the propagation time principle having a detector unit for mechanical-elastic density waves |
| CN102265120B (en) * | 2009-01-02 | 2014-06-04 | Asm自动化传感器测量技术有限公司 | Magnetostriction position sensor according to the propagation time principle having a detector unit for mechanical-elastic density waves |
| CN104583729A (en) * | 2012-08-14 | 2015-04-29 | 保险丝公司 | Extended stroke position sensor |
| CN104583729B (en) * | 2012-08-14 | 2019-03-01 | 哈姆林电子(苏州)有限公司 | The distance position sensor of extension |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |