CN205619868U - Current vortex sensor's probe and current vortex sensor - Google Patents
Current vortex sensor's probe and current vortex sensor Download PDFInfo
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- CN205619868U CN205619868U CN201620147484.7U CN201620147484U CN205619868U CN 205619868 U CN205619868 U CN 205619868U CN 201620147484 U CN201620147484 U CN 201620147484U CN 205619868 U CN205619868 U CN 205619868U
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Abstract
The utility model discloses a current vortex sensor's probe and current vortex sensor. Current vortex sensor's probe includes detecting coil and temperature compensating coil, the detecting coil is parallel with the test surface of probe, the temperature compensating coil perpendicular to the detecting coil, and no longer than the inboard coil place plane of detecting coil, wherein the inboard coil of detecting coil be with the shortest circle detecting coil of test surface distance. The utility model provides a current current vortex sensor floats because of the temperature and leads to detecting the precision and not high or amass great problem because of temperature compensating causes probe body, reduces the size of popping one's head in on realizing guaranteeing detecting the basis of precision, reaches temperature compensating wide range, the little effect of the size of popping one's head in.
Description
Technical field
This utility model embodiment relates to distance-measuring equipment, particularly relates to probe and the current vortex sensor of a kind of current vortex sensor.
Background technology
Eddy current displacement sensor owing to having that noncontact, measurement scope be big, highly sensitive, simple in construction, the many merits such as do not affected by nonmetallic materials, be widely used at detection field.
The probe of common eddy current displacement sensor is made up of the nonmetal skeleton of a flat coil and fixed coil.Owing to coil and skeleton generally use common material, if the variation of ambient temperature of sensor probe is little, the output of sensor is influenced by temperature smaller, and the output of sensor can reflect the size of tested displacement exactly.After the ambient temperature of sensor exceeds the normal working temperature of sensor, the material of sensor probe not only can not bear the effect of high temperature, and hot environment can make the resistance of sensor, inductance and physical dimension that significantly change occurs, and causes the output of eddy current displacement sensor can not reflect the size of tested displacement exactly.
At present, the temperature-compensating of the eddy current displacement sensor on market is to carry out algorithm compensation in fore-lying device, and the method compensation precision is relatively low.It addition, use the head at sensor to use some technical measures the most more on the sensor of the impact of sensor electrical parameter to reduce ambient temperature on market, as with multiply litzendraht wire or with the wire coiling of low-temperature coefficient, the compensation effect of which is limited.Additionally, prior art also have the detection coil on sensor compensate the reduction ambient temperature scheme on the impact of coil output characteristics, as used noninductive bucking coil or with negative temperature coefficient resister, coil temperature being compensated, the probe size using this compensation method to design can be elongated, is unfavorable in some cases installing and displacement detecting.
Utility model content
This utility model provides probe and the current vortex sensor of a kind of current vortex sensor, to realize reducing probe size on the basis of ensureing accuracy of detection, reaches the effect that temperature compensation range is wide, probe size is little.
First aspect, this utility model embodiment provides the probe of a kind of current vortex sensor, including detection coil and temperature-compensating coil, described detection coil is parallel with the test surface of probe, described temperature-compensating coil is perpendicular to described detection coil, and less than the inner coil place plane of described detection coil, the inner coil of wherein said detection coil is a circle detection coil the shortest with described test surface distance.
Second aspect, this utility model embodiment additionally provides a kind of current vortex sensor, including fore-lying device, extension cable and the probe of above-mentioned first aspect；
The detection lead-out wires of coil of described detection coil is electrically connected with described fore-lying device by extension cable；
The bucking coil lead-out wire of described temperature-compensating coil is electrically connected with described fore-lying device by extension cable；
Described fore-lying device, for receiving detection signal and the compensation signal of described temperature-compensating coil of described detection coil, carries out calculus of differences to described detection signal and described compensation signal, to eliminate the temperature drift of described detection coil.
This utility model, by increasing the temperature-compensating coil vertical with detection coil in probe, carries out temperature-compensating to described detection coil, eliminates temperature drift, improves accuracy of detection；Simultaneously as described detection coil is perpendicular with described temperature-compensating coil, it is possible to eliminate the vortex field impact between two coils, obtain wider array of temperature compensation range.This utility model existing current vortex sensor of solution causes accuracy of detection the highest or because temperature-compensating causes the problem that probe size is bigger because of temperature drift, reduce probe size on the basis of realizing ensureing accuracy of detection, reach the effect that temperature compensation range is wide, probe size is little.
Accompanying drawing explanation
Fig. 1 is the floor map of the probe of a kind of current vortex sensor in this utility model embodiment one；
Fig. 2 be a kind of current vortex sensor in this utility model embodiment one probe in detect coil and the schematic perspective view of temperature-compensating coil；
Fig. 3 is the floor map of the probe of a kind of current vortex sensor in this utility model embodiment two；
Fig. 4 is the floor map of the probe of a kind of current vortex sensor in this utility model embodiment three；
Fig. 5 is the floor map of the probe of the another kind of current vortex sensor in this utility model embodiment four；
Fig. 6 is the floor map of the probe of the another kind of current vortex sensor in this utility model embodiment five；
Fig. 7 is the structured flowchart of a kind of current vortex sensor in this utility model embodiment six；
Fig. 8 is the structured flowchart of fore-lying device in a kind of current vortex sensor in this utility model embodiment seven.
Detailed description of the invention
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.It is understood that specific embodiment described herein is used only for explaining this utility model, rather than to restriction of the present utility model.It also should be noted that, for the ease of describing, accompanying drawing illustrate only the part relevant to this utility model rather than entire infrastructure.
Embodiment one
The floor map of the probe of a kind of current vortex sensor that Fig. 1 provides for this utility model embodiment one, the present embodiment reduces the situation of probe size on the basis of being applicable to ensure accuracy of detection, specifically include: detection coil 1 and temperature-compensating coil 2, described detection coil 1 is parallel with the test surface 31 of probe 3, described temperature-compensating coil 2 is perpendicular to described detection coil 1, and less than the inner coil place plane of described detection coil 1, the inner coil of wherein said detection coil 1 is apart from a shortest circle detection coil with described test surface 31.
According to Faraday law of electromagnetic induction, when the detection coil 1 in probe 3 passes to sinusoidal alternating current i1Time, detection coil 1 surrounding space necessarily leads to sine alternating magnetic field H1, it makes the metal conductor measured surface being placed in this magnetic field produce faradic current, i.e. current vortex.Meanwhile, current vortex i2Produce again new alternating magnetic field H2；H2With H1In opposite direction, and play weakening H1The effect of magnetic field intensity, thus cause the equivalent resistance detecting coil 1 correspondingly to change.Its intensity of variation depends on the parameters such as distance x of the electricalresistivityρ of metal conductor measured, magnetic permeability μ, coil and metallic conductor, and frequency f of coil energizing current.If only changing distance x in above-mentioned parameter, and remaining parameter keeping constant, then the equivalent resistance Z of detection coil 1 just becomes the monotropic function about distance x.It is thus possible to determined the size of distance x by the equivalent resistance Z of detection coil 1.
But, in the case of temperature is higher, the output signal of detection coil 1 can be affected by temperature, causes the output signal of current vortex sensor to produce bigger error.Thus, the probe 3 of described current vortex sensor increases temperature-compensating coil 2, balances out the temperature drift of detection coil 1 according to the temperature drift of temperature-compensating coil 2.Wherein, temperature-compensating coil 2 is preferably identical with the structurally and electrically parameter of described detection coil 1.Further, identical enamel-covered wire coiling detection coil 1 and temperature-compensating coil 2 respectively can be used, and detection coil 1 is with temperature-compensating coil 2Circle coil bundle, wherein L is the external diameter difference with internal diameter of coil, and W is the width of coil.Owing to temperature-compensating coil 2 is as the benchmark of detection coil 1, by detection lead-out wires of coil 11 by the equivalent resistance Z of detection coil 11Export to fore-lying device, meanwhile, by bucking coil lead-out wire 21 by the equivalent resistance Z of temperature-compensating coil 2 with the output signal of distance x change2Export to fore-lying device with the output signal of distance x change.Along with the impedance of two coils of change of temperature all occurs identical change, carry out, by fore-lying device, two coil impedance differences that calculus of differences obtains and keep constant, therefore, effectively can carry out temperature-compensating to detecting coil 1 by temperature-compensating coil 2.
Seeing described in Fig. 1, described detection coil 1 is parallel with the test surface 31 of probe 3, and described temperature-compensating coil 2 is perpendicular to described detection coil 1.Pass to, with temperature-compensating coil 2, the pumping signal that frequency is the most identical with amplitude to detection coil 1 respectively by peripheral circuit.Necessarily lead to the magnetic field of a high frequency oscillation at detection coil 1 surrounding space, according to right-hand screw rule, magnetic direction is perpendicular to measured object 4.Also necessarily lead to the magnetic field of a high frequency oscillation at temperature-compensating coil 2 surrounding space, according to right-hand screw rule, magnetic direction is parallel to measured object 4.Now, the magnetic field of temperature-compensating coil 2, without interference with the magnetic field of detection coil 1, during displacement detecting, reaches to be compensated temperature, and is not introduced into due to electromagnetic effect and the purpose of new error that produces between two coils.
See described in Fig. 2, detection coil 1 is parallel to measured object 4, and temperature-compensating coil 2 is perpendicular to described detection coil 1, and less than the inner coil place plane of described detection coil 1, the inner coil of wherein said detection coil 1 is apart from a shortest circle detection coil with described test surface 31.Owing to when actual package, the distance between the test surface 31 of detection coil 1 and probe 3 is less, if temperature-compensating coil 2 is beyond detection coil, then encapsulation can be affected.For the ease of encapsulation, use the temperature-compensating coil 2 design less than the inner coil place plane of detection coil 1.
The technical scheme of the present embodiment, by increasing the temperature-compensating coil 2 vertical with detection coil in probe 3, carries out temperature-compensating to described detection coil, eliminates temperature drift, improves accuracy of detection；Simultaneously as described detection coil is perpendicular with described temperature-compensating coil 2, it is possible to eliminate the vortex field impact between two coils, obtain wider array of temperature compensation range.The technical scheme of the present embodiment solves existing current vortex sensor and causes accuracy of detection the highest because of temperature drift or cause the problem that probe 3 volumes are bigger because of temperature-compensating, probe 3 length making sensor on the basis of realizing ensureing accuracy of detection reduces 20%-30%, reaches the effect that temperature compensation range is wide, 3 sizes of popping one's head in are little.
Embodiment two
Fig. 3 is the floor map of the probe of a kind of current vortex sensor in this utility model embodiment two.The technical scheme of the present embodiment is on the basis of above-described embodiment, the position of detection coil 1 and temperature-compensating coil 2 is specifically limited, specifically include: described detection coil 1 is circle with the profile of described temperature-compensating coil 2, and the diameter of the inner coil of described detection coil 1 is tangent with the outline of described temperature-compensating coil 2.So design is advantageous in that eliminating temperature-compensating coil 2 reduces probe size to while the vortex field impact of detection coil 1.
Embodiment three
Fig. 4 is the floor map of the probe of a kind of current vortex sensor in this utility model embodiment three.The technical scheme of the present embodiment is on the basis of embodiment one, the position of detection coil 1 and temperature-compensating coil 2 is specifically limited, specifically include: described detection coil 1 is circle with the profile of described temperature-compensating coil 2, the outline of the diameter of the inner coil of described detection coil 1 and described temperature-compensating coil 2 from, and the diameter of outer coil of described detection coil 1 intersects with the outline of described temperature-compensating coil 2, wherein, the outer coil of described detection coil 1 is apart from a farthest circle detection coil with described test surface.So design is advantageous in that eliminating temperature-compensating coil 2 reduces probe size to while the vortex field impact of detection coil 1.
Embodiment four
Fig. 5 is the floor map of the probe of a kind of current vortex sensor in this utility model embodiment four.The technical scheme of the present embodiment is on the basis of embodiment one, the position of detection coil 1 and temperature-compensating coil 2 is specifically limited, specifically include: described detection coil 1 is circle with the profile of described temperature-compensating coil 2, the diameter of the outer coil of described detection coil 1 is tangent with the outline of described temperature-compensating coil 2, wherein, the outer coil of described detection coil 1 is apart from a farthest circle detection coil with described test surface.So design is advantageous in that eliminating temperature-compensating coil 2 reduces probe size to while the vortex field impact of detection coil 1.
Embodiment five
Fig. 6 is the floor map of the probe of a kind of current vortex sensor in this utility model embodiment five.The technical scheme of the present embodiment is on the basis of embodiment one, the position of detection coil 1 and temperature-compensating coil 2 is specifically limited, specifically include: described detection coil 1 is circle with the profile of described temperature-compensating coil 2, the outline of the diameter of the outer coil of described detection coil 1 and described temperature-compensating coil 2 from, wherein, the outer coil of described detection coil 1 is apart from a farthest circle detection coil with described test surface.So design is advantageous in that eliminating temperature-compensating coil 2 reduces probe size to while the vortex field impact of detection coil 1.
Embodiment six
Fig. 7 is the structured flowchart of a kind of current vortex sensor in this utility model embodiment six.This current vortex sensor includes the probe 710 of fore-lying device 730, extension cable 720 and any of the above-described embodiment；
The detection lead-out wires of coil of described detection coil is electrically connected with described fore-lying device 730 by extension cable 720；
The bucking coil lead-out wire of described temperature-compensating coil is electrically connected with described fore-lying device 730 by extension cable 720；
Described fore-lying device 730, for receiving detection signal and the compensation signal of described temperature-compensating coil of described detection coil, carries out calculus of differences to described detection signal and described compensation signal, to eliminate the temperature drift of described detection coil.
The technical scheme of the present embodiment, by using the probe 710 described in above-described embodiment, realize two coil magnetic fields to be vertically independent of each other, the vortex field impact between two coils can either be eliminated, temperature-compensating can be carried out again, reach to reduce the purpose of sensor probe volume, and then, effectively reduce sensor bulk, and due to the interpolation of temperature-compensating coil, the computing in fore-lying device 730 is made to form closed loop, it is possible to effectively detection coil to be carried out Temperature Feedback compensation.
Embodiment seven
Fig. 8 is the structured flowchart of fore-lying device in a kind of current vortex sensor in this utility model embodiment seven.The structure of fore-lying device, on the basis of embodiment seven, is defined, specifically includes by the technical scheme of the present embodiment further: difference channel 731, detecting circuit 732, filtering and amplifying circuit 733 and processor 734；
Described difference channel 731 electrically connects with described detection coil and temperature-compensating coil respectively, is used for receiving described detection signal and described compensation signal, and output differential signal is to described detecting circuit 732；
Described detecting circuit 732 electrically connects with described filtering and amplifying circuit 733, is used for receiving described differential signal, output low frequency signal to described filtering and amplifying circuit 733；
Described filtering and amplifying circuit 733 electrically connects with described processor 734, is used for receiving described low frequency signal, described low frequency signal is amplified process and Filtering Processing obtains output signal, described output signal is inputted described processor 734；
Described processor 734, obtains testing result for described output signal carries out linearity correction operation.
Shown in Figure 8, the output voltage of detection coil is V1, the output voltage of temperature-compensating coil is V2, by difference channel 731 to V1And V2Carrying out subtraction and obtain differential signal, the voltage of differential signal is V, i.e. V=V1-V2。
Under probe is in the condition of high temperature, detect coil output voltage V1With temperature-compensating coil output voltage V2All can produce temperature drift, two coil dimensions are identical with structural parameters, and temperature identical with the temperature drift that temperature-compensating coil produces to detection coil (the predominantly equivalent resistance change of coil produces), the temperature drift produced at such a temperature is VR, output voltage V under current high-temperature conditionout, i.e. Vout=(V1±VR)-(V2±VR)=V1-V2=V.Therefore, in hot environment, the difference channel 731 of current vortex sensor exports total voltage V after processingoutUnder temperature-compensating coil effect identical with the voltage V of differential signal of output in home, therefore, temperature-compensating coil effectively compensates because temperature that high temperature produces is floated detecting coil in current vortex sensor.Difference channel 731 exports differential signal extremely described detecting circuit 732, and after detection, output low frequency signal is to filtering and amplifying circuit 733.Filtering and amplifying circuit 733 receives described low frequency signal, described low frequency signal is amplified process and Filtering Processing obtains output signal, described output signal is inputted described processor 734.The operation of digital signal (A/D) is turned and linearity correction operation obtains testing result through analogue signal.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.It will be appreciated by those skilled in the art that this utility model is not limited to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute without departing from protection domain of the present utility model.Therefore, although this utility model being described in further detail by above example, but this utility model is not limited only to above example, in the case of conceiving without departing from this utility model, other Equivalent embodiments more can also be included, and scope of the present utility model is determined by scope of the appended claims.
Claims (9)
1. the probe of a current vortex sensor, including detection coil and temperature-compensating coil, it is characterized in that, described detection coil is parallel with the test surface of probe, described temperature-compensating coil is perpendicular to described detection coil, and less than the inner coil place plane of described detection coil, the inner coil of wherein said detection coil is a circle detection coil the shortest with described test surface distance.
Probe the most according to claim 1, it is characterised in that described detection coil is identical with the structurally and electrically parameter of described temperature-compensating coil.
Probe the most according to claim 1, it is characterised in that described detection coil is with described temperature-compensating coilCircle coil bundle, wherein L is the external diameter difference with internal diameter of coil, and W is the width of coil.
4. according to described probe arbitrary in claims 1 to 3, it is characterised in that described detection coil is circle with the profile of described temperature-compensating coil, and the diameter of the inner coil of described detection coil is tangent with the outline of described temperature-compensating coil.
5. according to described probe arbitrary in claims 1 to 3, it is characterized in that, described detection coil is circle with the profile of described temperature-compensating coil, the diameter of the inner coil of described detection coil and the outline of described temperature-compensating coil from, and the diameter of outer coil of described detection coil intersects with the outline of described temperature-compensating coil, wherein, the outer coil of described detection coil is apart from a farthest circle detection coil with described test surface.
6. according to described probe arbitrary in claims 1 to 3, it is characterized in that, described detection coil is circle with the profile of described temperature-compensating coil, the diameter of the outer coil of described detection coil is tangent with the outline of described temperature-compensating coil, wherein, the outer coil of described detection coil is apart from a farthest circle detection coil with described test surface.
7. according to described probe arbitrary in claims 1 to 3, it is characterized in that, described detection coil is circle with the profile of described temperature-compensating coil, the diameter of the outer coil of described detection coil and the outline of described temperature-compensating coil from, wherein, the outer coil of described detection coil is apart from a farthest circle detection coil with described test surface.
8. a current vortex sensor, including fore-lying device and extension cable, it is characterised in that also include arbitrary described probe in claim 1 to 7；
The detection lead-out wires of coil of described detection coil is electrically connected with described fore-lying device by extension cable；
The bucking coil lead-out wire of described temperature-compensating coil is electrically connected with described fore-lying device by extension cable；
Described fore-lying device, for receiving detection signal and the compensation signal of described temperature-compensating coil of described detection coil, carries out calculus of differences to described detection signal and described compensation signal, to eliminate the temperature drift of described detection coil.
Current vortex sensor the most according to claim 8, it is characterised in that described fore-lying device includes difference channel, detecting circuit, filtering and amplifying circuit and processor；
Described difference channel electrically connects with described detection coil and temperature-compensating coil respectively, is used for receiving described detection signal and described compensation signal, and output differential signal is to described detecting circuit；
Described detecting circuit electrically connects with described filtering and amplifying circuit, is used for receiving described differential signal, output low frequency signal to described filtering and amplifying circuit；
Described filtering and amplifying circuit electrically connects with described processor, is used for receiving described low frequency signal, described low frequency signal is amplified process and Filtering Processing obtains output signal, described output signal is inputted described processor；
Described processor, obtains testing result for described output signal carries out linearity correction operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620147484.7U CN205619868U (en) | 2016-02-25 | 2016-02-25 | Current vortex sensor's probe and current vortex sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620147484.7U CN205619868U (en) | 2016-02-25 | 2016-02-25 | Current vortex sensor's probe and current vortex sensor |
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| CN205619868U true CN205619868U (en) | 2016-10-05 |
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| CN201620147484.7U Expired - Fee Related CN205619868U (en) | 2016-02-25 | 2016-02-25 | Current vortex sensor's probe and current vortex sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105737727A (en) * | 2016-02-25 | 2016-07-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Probe of eddy current sensor and eddy current sensor |
-
2016
- 2016-02-25 CN CN201620147484.7U patent/CN205619868U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105737727A (en) * | 2016-02-25 | 2016-07-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Probe of eddy current sensor and eddy current sensor |
| CN105737727B (en) * | 2016-02-25 | 2019-03-19 | 珠海格力电器股份有限公司 | A kind of probe and current vortex sensor of current vortex sensor |
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Granted publication date: 20161005 Termination date: 20170225 |