CN1090925A - Differential displacement sensor - Google Patents
Differential displacement sensor Download PDFInfo
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- CN1090925A CN1090925A CN 93119125 CN93119125A CN1090925A CN 1090925 A CN1090925 A CN 1090925A CN 93119125 CN93119125 CN 93119125 CN 93119125 A CN93119125 A CN 93119125A CN 1090925 A CN1090925 A CN 1090925A
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- coil
- armature
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Abstract
" differential displacement sensor " is a kind of sensor that is suitable for measuring distortion.It is made up of with the primary and secondary coil of inside and outside two helix tube types that surround armature the armature of displacement vertically.Be characterized in that secondary coil adopts the hollow tubular coil of a plurality of axial array to constitute, each coil voltage is drawn separately, carries out dynamic tracking by switching network and replaces the fixedly connected secondary coil of traditional sensors.Its total of this sensor resembles a plurality of brief biography sensor series connection, thereby has guaranteed in tens millimeters to several meters scopes high measuring accuracy is arranged all, has expanded its application, has also simplified manufacturing process simultaneously.
Description
The present invention relates to a kind of displacement transducer, especially for the helix tube type differential transformer displacement sensor of measuring distortion.
Existing differential transformer displacement sensor is the primary coil by the armature of a displacement vertically and encirclement armature, is enclosed within the secondary coil composition that two outer reversed polarity of primary coil connect.Primary coil connects power supply, utilizes the armature displacement to change the magnetic resistance of magnetic circuit that is coupled between elementary and two secondary coils, subtracts thereby make the induced voltage one of two secondary coils increase one, and its voltage difference has promptly reflected the armature displacement.This sensor, because of having only two fixedly connected secondary coils, no matter range is much, and where armature is in, and is not always the case.When range enlarges, roughly in proportion with armature and coil lengthening.Because of its degree of coupling changes in whole range internal linear, range is big more, changes slow more.So, for different ranges, can only guarantee that relative accuracy is roughly constant, roughly constant to the relative sensitivity of full scale, processing request is also high.
In view of above-mentioned, the purpose of this invention is to provide a kind of in tens millimeters to several meters scopes, when range enlarges, its absolute precision and sensitivity are constant substantially, relative accuracy and differential displacement sensor to the corresponding increase of sensitivity of full scale, thereby the measuring accuracy when having improved wide range greatly, and can reduce difficulty of processing.
Main points of the present invention are to adopt the secondary coil of a plurality of axial array, and its induced voltage is drawn separately, by switching network, carry out dynamic tracking and replace the existing fixedly connected secondary coil of sensor.It is realized as follows, in outside the armature that moves vertically, having surrounded, outer two helix tube type coils, one of them is that primary coil links to each other with power supply, another is a time primary coil, it is to be made of the hollow pipe-type coil that m section (m is the positive integer greater than 2) is arranged vertically, the output of each section coil introduce analog multichannel switch be combined into two secondary, these two secondary output voltages divide two tunnel outputs after signal processor processes, wherein one the tunnel be output as the signal that reflects the armature displacement, the analog multichannel switch of control break coil segment combination is removed in another road output, to realize dynamic tracking.
Above-mentioned inside and outside two toroidal windings can be that interior loop is a primary coil, and exterior loop is a secondary coil, perhaps also can be that interior loop is a secondary coil, and exterior loop is a primary coil.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Fig. 1 is a kind of concrete structure synoptic diagram of sensor of the present invention;
Fig. 2 is the Fundamentals of Sensors block diagrams;
Fig. 3 is the Analysis of Working Performance figure of sensor;
Fig. 4 is a kind of embodiment of the present invention;
Fig. 5 is another kind of embodiment of the present invention.
In concrete structure shown in Figure 1,1 is armature, and 2 is primary coil, and 3 for containing the secondary coil of m section coil, and 4 is shell.Primary coil links to each other with power supply, and the output of each secondary coil introduce analog multichannel switch be combined into two secondary, each coil is not devoted oneself to work simultaneously, but along with the armature position difference, the coil of devoting oneself to work is also different, as establish armature when the diagram solid line position, i, i+1 section coil and i-1, two of i-2 section coil formations are secondary, when armature moves to the diagram dotted line position, i+2 then, i+3 section coil and i+1, i section coil constitute two secondary, generally, each secondaryly contains 2～3 sections coils.Thereby, on a parochial basis, can regard a little range sensors of only forming as by these several sections secondary coils, as long as guarantee this " little sensor " enough precision are arranged, when range enlarged, its absolute precision was constant, and relative accuracy has just improved greatly.General desirable about 1.5～3 times of coil segment lengths of the length of armature.
Contrast Fig. 2 schematic diagram, two secondary output voltages that are combined into by analog multichannel switch 5 divide two tunnel outputs after signal processor 6 is handled, wherein one tunnel output is the signal of reflection armature displacement size, the output of another road removes to control analog multichannel switch, so that the combination of each coil changes with the variation of armature position.
The operating characteristic of differential displacement sensor is seen Fig. 3, and wherein (a) figure of Fig. 3 is armature and coil relative position synoptic diagram, and (b) figure of Fig. 3 is that the single coil output characteristics is (as E
3Be the output of the 3rd section coil), (c) figure of Fig. 3 is the characteristic after the adjacent two coils output combination, (d) figure of Fig. 3 is the output characteristics after the combined characteristic " differential ".Horizontal ordinate X represents that with armature A point be the displacement of benchmark among the figure, and ordinate is represented magnitude of voltage.When armature A point at a, in the time of between the b, what devote oneself to work is the 0th, 1,2,3, four sections coils, the 0th, 1 section coil reach respectively 2,3 sections coils constitute respectively two secondary, its output voltage is V
O=(E
3+ E
2-E
1-E
0), when armature A point moves on to b, in the time of between the c, what devote oneself to work is the 1st, 2,3,4 four sections coils, its 1,2 section coil and 3,4 sections coils constitute respectively two secondary, output voltage at this moment is V
1=(E
4+ E
3-E
2-E
1), the rest may be inferred by analogy.This output syntagmatic with each coil of armature position variation the change is dynamic tracking.As seen from the figure, the A point when crossing switching point b from a left side, E
3From less than E
1Become greater than E
1, the control of 6 pairs of analog multichannel switches 5 of signal processor is put according to this and is realized.
In instantiation shown in Figure 4, signal processor is by counter J, logic controller T, comparer P
1, P
2, P
3, operational amplifier S
1, S
2, trigger G
1, G
2, G
3Constitute, suppose that each secondaryly contains three sections coils, the coil of then devoting oneself to work has six sections, and is secondary with 5 two of the formation of six groups of analog multichannel switches, the coil of devoting oneself to work is different with the variation of armature position, is that when counter was output as 0, establishing the coil of devoting oneself to work was the 0th by the output control of counter J, 1,2,3,4,5 these six sections, it is 0 years old, 1,2, and 3,4,5 sections coils are secondary as two respectively, and the output voltage of analog multichannel switch is respectively E from top to bottom
0, E
1, E
2, E
3, E
4E
5, these are exported through operational amplifier S
1Comprehensive is V
0=(E
3+ E
4+ E
5)-(E
0+ E
1+ E
2) at S
aPoint output.It is exactly the solid line of Fig. 3 (d) figure, and its value has determined other point of relative minizone (to be equivalent to m among the figure
1, m
2, m
3Deng point) displacement, and the output S of counter
a, determine it in which interval, they determine the total displacement of armature jointly.When armature moves right, reach E
4＞E
2The time, comparer P
1Be output as high level, make trigger G
1Q
0End is 1, makes counter add 1 by logic controller T, and the coil of at this moment devoting oneself to work is the 1st, 2,3,4, and 5,6 these six sections, the output voltage of analog multichannel switch is respectively E from top to bottom
1, E
2, E
3, E
4, E
5, E
6, this moment operational amplifier S
1Output become V
1=(E
4+ E
5+ E
6)-(E
1+ E
2+ E
3), otherwise, as this moment armature to moving to left, reach E
2＞E
4The time, comparer P
2Be output as high level, make trigger G
2Q
1End is 1, makes counter subtract 1 by logic controller, and the coil of at this moment devoting oneself to work is also corresponding to change.Operational amplifier S
2, comparer P
3, trigger G
3Setting be used for initial search.
In example shown in Figure 5, signal processor is by the A/D transducer, and digital signal device B(generally uses computing machine, also can use single-chip microcomputer), constitute with code translator C, the output of relevant each section of secondary coil inserts the A/D transducer through analog multichannel switch 5, is transformed into digital signal, compares in digital signal device then, combination, 0 output digital displacement value, in K point output control signal, this control signal is through code translator C input analog multichannel switch.Here, analog multichannel switch can adopt common analog multichannel switch.
Preferably analog multichannel switch and signal processor are encapsulated in the sensor body,, increase reliability to reduce lead-in wire.
Because displacement transducer of the present invention has adopted multisection type secondary coil and Dynamic Tracing Technology, total resembles the series connection of a plurality of little sensors, and has realized smooth connection, the value when absolute precision still remains on a small amount of journey so reached range extension, improved measuring accuracy greatly, also expanded simultaneously its application, can be used for the processing of large scale high-accuracy mechanical, the operation of rolling is measured control, large-deformation measuring is waited for, in addition, because of coil grading, also simplified manufacturing process.
Claims (5)
1, a kind of differential displacement sensor, have the armature [1] of displacement vertically and surround armature in, outer two helix tube type coils, one of them is that primary coil [2] links to each other with power supply, another is secondary coil [3], it is characterized in that secondary coil is to be made of the hollow pipe-type coil that m section (m is the positive integer greater than 2) is arranged vertically, the output of each section coil introduce analog multichannel switch [5] be combined into two secondary, these two secondary output voltages divide two tunnel outputs after signal processor [6] is handled, wherein one the tunnel be output as the signal that reflects the armature displacement, the analog multichannel switch of control break coil segment combination is removed in another road output.
2, by the described displacement transducer of claim 1, it is characterized in that inside and outside two toroidal windings are that interior loop is a primary coil, exterior loop is a secondary coil, or interior loop is secondary coil, exterior loop is a primary coil.
3, by the described displacement transducer of claim 1, it is characterized in that said signal processor is by counter [J], logic controller [T], comparer [P
1, P
2, P
3], operational amplifier [S
1, S
2], trigger [G
1, G
2, G
3] constitute.
4, by the described displacement transducer of claim 1, it is characterized in that said signal processor is by the A/D transducer, digital signal device [B] and code translator [C] constitute.
5, by the described displacement transducer of claim 1, it is characterized in that analog multichannel switch [5] and signal processor [6] are encapsulated in the sensor body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93119125 CN1090925A (en) | 1993-10-14 | 1993-10-14 | Differential displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93119125 CN1090925A (en) | 1993-10-14 | 1993-10-14 | Differential displacement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1090925A true CN1090925A (en) | 1994-08-17 |
Family
ID=4992786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93119125 Pending CN1090925A (en) | 1993-10-14 | 1993-10-14 | Differential displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1090925A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063121A (en) * | 2012-12-26 | 2013-04-24 | 东北农业大学 | Displacement measuring device and displacement measuring method used for differential transformer and based on switch type excitation source |
| CN103900527A (en) * | 2012-12-26 | 2014-07-02 | 贵州风雷航空军械有限责任公司 | Air pressure altitude detection apparatus |
| CN104697427A (en) * | 2014-12-12 | 2015-06-10 | 中国航空工业集团公司北京长城计量测试技术研究所 | Differential transformer type inductance displacement sensor composed of multiple coils |
| CN114659438A (en) * | 2022-05-20 | 2022-06-24 | 山东华东风机有限公司 | Detection device and detection method for differential displacement sensor |
-
1993
- 1993-10-14 CN CN 93119125 patent/CN1090925A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063121A (en) * | 2012-12-26 | 2013-04-24 | 东北农业大学 | Displacement measuring device and displacement measuring method used for differential transformer and based on switch type excitation source |
| CN103900527A (en) * | 2012-12-26 | 2014-07-02 | 贵州风雷航空军械有限责任公司 | Air pressure altitude detection apparatus |
| CN103063121B (en) * | 2012-12-26 | 2015-10-28 | 东北农业大学 | Based on differential transformer displacement measurement mechanism and the measuring method thereof in switched energization source |
| CN104697427A (en) * | 2014-12-12 | 2015-06-10 | 中国航空工业集团公司北京长城计量测试技术研究所 | Differential transformer type inductance displacement sensor composed of multiple coils |
| CN104697427B (en) * | 2014-12-12 | 2017-06-09 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of differential transformer type inductance displacement sensor being made up of multiple coils |
| CN114659438A (en) * | 2022-05-20 | 2022-06-24 | 山东华东风机有限公司 | Detection device and detection method for differential displacement sensor |
| CN114659438B (en) * | 2022-05-20 | 2022-08-05 | 山东华东风机有限公司 | Detection device and detection method for differential displacement sensor |
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