CN101915592A - High-accuracy position system based on electromagnetic induction - Google Patents
High-accuracy position system based on electromagnetic induction Download PDFInfo
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- CN101915592A CN101915592A CN2010102272290A CN201010227229A CN101915592A CN 101915592 A CN101915592 A CN 101915592A CN 2010102272290 A CN2010102272290 A CN 2010102272290A CN 201010227229 A CN201010227229 A CN 201010227229A CN 101915592 A CN101915592 A CN 101915592A
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Abstract
The invention belongs to the field of electronic technology and relates to a high-accuracy position system based on electromagnetic induction, which solves the technical problems of the prior art, such as unreasonable design, low accuracy and the like. The position system comprises an electromagnetic induction sensor and a control and measurement system, wherein the control and measurement system comprises a pumping signal generation module which can generate a pumping signal and is connected with the electromagnetic induction sensor. When acting, the electromagnetic induction sensor can generate an electromagnetic induction signal which can be received by the control and measurement system; and the control and measurement system can realize positioning processing according to the pumping signal and the electromagnetic induction signal. The high-accuracy position system based on electromagnetic induction has the advantages of reasonable design, simple structure, high detection accuracy, good working stability, convenient use and operation and low cost; further more, the high-accuracy position system has comprehensive functions, not only can measure displacement, but also can detect displacement direction; and the high-accuracy position system has strong ability to resist ambient interference.
Description
Technical field
The invention belongs to electronic technology field, relate to positioning system, especially relate to a kind of high-accuracy position system based on electromagnetic induction.
Background technology
In order to realize locating exactly, people have carried out long-term exploration, have proposed various solutions.For example, Chinese patent literature discloses a kind of cross wedge rolling rolled piece axial direction positioning device [application number: 93201084.9] that is used for, be characterized in utilizing electromagnetic induction principle, to the coil electricity on the cased coil former, under the effect of magnetic field force, make the core iron action in the coil former hole, the backstay that promotes to connect together with heart yearn moves realization to the axially accurate location of rolled piece.The somebody has invented a kind of four or four fraction antenna arrangements and five-part form coordinate positioning method [application number: 02119706.7] of EM induction system, this patented claim is that antenna loop is divided into directions X and Y direction two groups, same group is all in the same way and has the antenna loop of equidistant property displacement, antenna loop in each direction group comprises a plurality of antenna loops, and the formation of each strip antenna loop comprises self intensive method that repeatedly repeats pitch of the laps, in addition, the five-part form scanning sequence of EM induction system comprises the following step at least: at first, carry out one first program to confirm whether the voltage of signals oscillator intensity is arranged greater than the accurate position of signal identification lower limit; Then, carry out one second program and whether existed, and confirm the immediate antenna loop of emissive source with the signal that affirmation last time scans; Afterwards, carry out one the 3rd program to obtain coordinate figure; At last, the internal microprocessor of EM induction system can calculate one group of absolute coordinates according to the coordinate figure of amplitude.
Technical matterss such as though such scheme has improved accurate positioning to a certain extent, it is reasonable inadequately still to exist structural design, and control accuracy is not high, and the cost cost is higher, and application is extensive inadequately.
Summary of the invention
The objective of the invention is at the problems referred to above, provide a kind of reasonable in design, simple in structure, the bearing accuracy height, easy operating uses, and lower-cost high-accuracy position system based on electromagnetic induction.
For achieving the above object, the present invention has adopted following technical proposal: this is based on the high-accuracy position system of electromagnetic induction, it is characterized in that, this positioning system comprises electromagnetic induction sensor and control and measuring system, described control and measuring system comprise the pumping signal generation module that can produce pumping signal, described pumping signal generation module is connected with the electromagnetic induction sensor that can move under external force, described electromagnetic induction sensor can produce electromagnetic induction signal and this electromagnetic induction signal energy Be Controlled and measuring system and receive when action, described control and measuring system can realize localization process according to pumping signal and electromagnetic induction signal.
In above-mentioned high-accuracy position system based on electromagnetic induction, described electromagnetic induction sensor comprises the electromagnetic coupled coil, in the electromagnetic coupled coil, be equipped with a piston rod, have the magnetic conduction portion that is provided with at interval and non-magnetic conduction portion on this piston rod, the non-magnetic conduction of the equal in length of described magnetic conduction portion and non-magnetic conduction portion and an adjacent magnetic conduction portion and portion constitutes a pitch.
In above-mentioned high-accuracy position system based on electromagnetic induction, described pumping signal generation module comprises crystal oscillator, be connected the frequency division counter unit on the crystal oscillator, on the frequency division counter unit, be connected with sinusoidal signal generation unit and cosine signal generation unit, described sinusoidal signal generation unit links to each other with a pair of sinusoidal signal line by the digital filtering unit, described cosine signal generation unit links to each other with a pair of cosine signal line by another digital filtering unit, and described sinusoidal signal line all links to each other with electromagnetic induction sensor with the cosine signal line.
In above-mentioned high-accuracy position system based on electromagnetic induction, described electromagnetic coupled coil is connected with control and measuring system by a pair of electromagnetic induction signal line, described electromagnetic induction sensor can produce electromagnetic induction signal when piston rod moves axially in the electromagnetic coupled coil, and this electromagnetic induction signal can transfer to control and measuring system by the electromagnetic induction signal line.
In above-mentioned high-accuracy position system based on electromagnetic induction, described control and measuring system also comprise the displacement computing unit, described electromagnetic induction sensor is connected with the displacement computing unit, and described pumping signal generation module is connected with the displacement computing unit.
In above-mentioned high-accuracy position system based on electromagnetic induction, described displacement computing unit comprises signal amplification unit, shaping unit, zero passage detection unit, data acquisition unit and the signal processor that links to each other successively, described signal amplification unit is connected with electromagnetic induction sensor, described pumping signal generation module is connected with signal processor, described frequency division counter unit is connected with the zero passage detection unit by the reference phase extraction unit, is connected with the displacement data output unit on the described signal processor.
In the above-mentioned high-accuracy position system based on electromagnetic induction, described signal processor comprises the moving direction judging unit that can judge the testee moving direction.
In the above-mentioned high-accuracy position system based on electromagnetic induction, the length of described pitch is 2
nMm, n are natural number.
Compared with prior art, this advantage based on the high-accuracy position system of electromagnetic induction is: 1, reasonable in design, simple in structure, and the accuracy of detection height, good operating stability, and easy for operation, cost is lower.2, complete function can be realized the measurement of displacement size, can detect sense of displacement again.3, anti-environmental interference ability is strong.
Description of drawings
Fig. 1 is a structural representation provided by the invention.
Fig. 2 is a theory diagram provided by the invention.
Fig. 3 is a pumping signal generation module theory diagram provided by the invention.
Fig. 4 is the oscillogram of sinusoidal signal provided by the invention, cosine signal and electromagnetic induction signal.
Among the figure, electromagnetic induction sensor 1, electromagnetic coupled coil 11, piston rod 12, magnetic conduction portion 121, non-magnetic conduction portion 122, pitch T, control and measuring system 2, pumping signal generation module 21, crystal oscillator 211, frequency division counter unit 212, sinusoidal signal generation unit 213, cosine signal generation unit 214, digital filtering unit 215, displacement computing unit 22, signal amplification unit 221, shaping unit 222, zero passage detection unit 223, data acquisition unit 224, signal processor 225, moving direction judging unit 2250, displacement data output unit 226, reference phase extraction unit 20.
Embodiment
Shown in Fig. 1-4, this high-accuracy position system based on electromagnetic induction comprises electromagnetic induction sensor 1 and control and measuring system 2.Control and measuring system 2 comprise the pumping signal generation module 21 that can produce pumping signal.Pumping signal generation module 21 is connected with the electromagnetic induction sensor 1 that can move under external force.Electromagnetic induction sensor 1 can produce electromagnetic induction signal when action and this electromagnetic induction signal can Be Controlled and measuring system 2 receptions.Control and measuring system 2 can realize localization process according to pumping signal and electromagnetic induction signal.
Electromagnetic induction sensor 1 comprises electromagnetic coupled coil 11, is equipped with a piston rod 12 in electromagnetic coupled coil 11, has the magnetic conduction portion 121 that is provided with at interval and non-magnetic conduction portion 122 on this piston rod 12.The non-magnetic conduction of the equal in length of magnetic conduction portion 121 and non-magnetic conduction portion 122 and an adjacent magnetic conduction portion 121 and one portion 122 constitutes a pitch T.Pumping signal generation module 21 comprises crystal oscillator 211, is connected the frequency division counter unit 212 on the crystal oscillator 211, is connected with sinusoidal signal generation unit 213 and cosine signal generation unit 214 on frequency division counter unit 212.Sinusoidal signal generation unit 213 links to each other with a pair of sinusoidal signal line by digital filtering unit 215, and cosine signal generation unit 214 links to each other with a pair of cosine signal line by another digital filtering unit 215.The sinusoidal signal line all links to each other with electromagnetic induction sensor 1 with the cosine signal line.
Electromagnetic coupled coil 11 is connected with control and measuring system 2 by a pair of electromagnetic induction signal line, described electromagnetic induction sensor 1 can produce electromagnetic induction signal when piston rod 12 moves axially in electromagnetic coupled coil 11, and this electromagnetic induction signal can transfer to control and measuring system 2 by the electromagnetic induction signal line.
Control and measuring system 2 also comprise displacement computing unit 22, and electromagnetic induction sensor 1 is connected with displacement computing unit 22, and pumping signal generation module 21 is connected with displacement computing unit 22.
Displacement computing unit 22 comprises signal amplification unit 221, shaping unit 222, zero passage detection unit 223, data acquisition unit 224 and the signal processor 225 that links to each other successively.Signal amplification unit 221 is connected with electromagnetic induction sensor 1.Pumping signal generation module 21 is connected with signal processor 225.Frequency division counter unit 212 is connected with zero passage detection unit 223 by reference phase extraction unit 20, is connected with displacement data output unit 226 on the signal processor 225.Signal processor 225 comprises the moving direction judging unit 2250 that can judge the testee moving direction.
More particularly, each pitch T is of a size of 2
nMm, wherein n is a natural number.Among the present invention, in order to realize high-acruracy survey, and the precision of measuring is because of the variation of oscillation frequency in the circuit exerts an influence, excitation just, cosine signal adopts digital form to produce fully, and just, the phase differential strict synchronism of cosine signal is at pi/2.Just, the one-period of cosine signal also just in time is the umber of pulse 2 that a pitch T is cut apart
n, wherein n is a natural number.Because of the umber of pulse that produces, sinusoidal, cosine signal all is according to same crystal oscillator 211 again, so guaranteed the precision of measuring.
Piston rod 12 is to be driven by external actuating unit that it is axially movable.Simultaneously, when piston rod 12 moves, the magnetic resistance of electromagnetic coupled coil 11 and magnetic conduction portion 121 and non-magnetic conduction portion 122 repeats to change, the variation of this magnetic resistance just makes the electromagnetic induction voltage phase place in the electromagnetic coupled coil 11 change, the electromagnetic induction voltage here is identical with the cosine signal frequency with sinusoidal signal, but the phase place difference.
The computing formula of electromagnetic induction voltage E is:
E=K Sin (t-2 π x/T), wherein T is a pitch, x is the absolute distance that moves in the pitch.
Electromagnetic induction voltage signal and sinusoidal signal I Sin ω t bit comparison mutually calculate phase difference θ.Δ θ=θ
Induction-θ
Excitation=θ
Induction-0=θ
Induction=2 π x/T
Therefore, x=Δ θ T/2 π so just can utilize Δ θ to calculate displacement x.The key here is: because the generation of I Sin ω t is the method for the umber of pulse generation (starting point of promptly counting umber of pulse is 0) of using tricks, as long as make zero passage detection for electromagnetic induction voltage like this, counting at this moment then, the umber of pulse of meter is exactly the phase delta θ of electromagnetic induction signal.In the actual measurement process because testee is two-way mobile, therefore should detected magnitude to the detection of displacement, again the detection side to.Traditional direction judgment circuit adopts discrete original paper to constitute circuit complexity, cost height.Moving direction judging unit of the present invention has made full use of the computing function of microprocessor (signal processor 225), and not only circuit is simple, and reliable, and cost is low.Read umber of pulse in the frequency division counter unit 212 detecting signal processor 225 in the signal period.The umber of pulse that this detection of example obtains is y
i, and the preceding umber of pulse that once measures is y
I-1, be Δ y then a detection signal cycle intrinsic displacement pulse increment value
i=y
i-y
I-1According to Δ y
iPositive and negative be the decidable moving direction, but owing to do not consider that at pitch T end place, umber of pulse has saltus step, as still pressing Δ y in the situation of pitch T end
i=y
i-y
I-1Calculate, will produce mistake, must be to Δ y
i=y
i-y
I-1Revise.If according to maximum movement speed, pumping signal can be during double sampling, and the absolute value of dfisplacement pulse increment can not surpass particular value.Be no more than 8 meter per seconds with the object maximum movement speed, exciting signal frequency 5khz (0.2ms), then during the double sampling, the absolute value of dfisplacement pulse increment is no more than 4096, promptly | y
i-y
I-1| 4096, Δ y then
i=y
i-y
I-1Be modified to:
Specific embodiment described herein only is that the present invention's spirit is illustrated.The technician of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used electromagnetic induction sensor 1 morely, electromagnetic coupled coil 11, piston rod 12, magnetic conduction portion 121, non-magnetic conduction portion 122, control and measuring system 2, pumping signal generation module 21, crystal oscillator 211, frequency division counter unit 212, sinusoidal signal generation unit 213, cosine signal generation unit 214, digital filtering unit 215, displacement computing unit 22, signal amplification unit 221, shaping unit 222, zero passage detection unit 223, data acquisition unit 224, signal processor 225, moving direction judging unit 2250, displacement data output unit 226, reference phase extraction unit 20 terms such as grade, but do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.
Claims (8)
1. high-accuracy position system based on electromagnetic induction, it is characterized in that, this positioning system comprises electromagnetic induction sensor (1) and control and measuring system (2), described control and measuring system (2) comprise the pumping signal generation module (21) that can produce pumping signal, described pumping signal generation module (21) is connected with the electromagnetic induction sensor that can move under external force (1), described electromagnetic induction sensor (1) can produce electromagnetic induction signal and this electromagnetic induction signal energy Be Controlled and measuring system (2) and receive when action, described control and measuring system (2) can realize localization process according to pumping signal and electromagnetic induction signal.
2. the high-accuracy position system based on electromagnetic induction according to claim 1, it is characterized in that, described electromagnetic induction sensor (1) comprises electromagnetic coupled coil (11), in electromagnetic coupled coil (11), be equipped with a piston rod (12), have the magnetic conduction portion (121) and the non-magnetic conduction portion (122) that are provided with at interval on this piston rod (12), the equal in length of described magnetic conduction portion (121) and non-magnetic conduction portion (122) and an adjacent magnetic conduction portion (121) and a non-magnetic conduction portion (122) constitute a pitch (T).
3. the high-accuracy position system based on electromagnetic induction according to claim 2, it is characterized in that, described pumping signal generation module (21) comprises crystal oscillator (211), be connected the frequency division counter unit (212) on the crystal oscillator (211), on frequency division counter unit (212), be connected with sinusoidal signal generation unit (213) and cosine signal generation unit (214), described sinusoidal signal generation unit (213) links to each other with a pair of sinusoidal signal line by digital filtering unit (215), described cosine signal generation unit (214) links to each other with a pair of cosine signal line by another digital filtering unit (215), and described sinusoidal signal line all links to each other with electromagnetic induction sensor (1) with the cosine signal line.
4. the high-accuracy position system based on electromagnetic induction according to claim 2, it is characterized in that, described electromagnetic coupled coil (11) is connected with control and measuring system (2) by a pair of electromagnetic induction signal line, described electromagnetic induction sensor (1) can produce electromagnetic induction signal when piston rod (12) moves axially in electromagnetic coupled coil (11), and this electromagnetic induction signal can transfer to control and measuring system (2) by the electromagnetic induction signal line.
5. according to claim 3 or 4 described high-accuracy position systems based on electromagnetic induction, it is characterized in that, described control and measuring system (2) also comprise displacement computing unit (22), described electromagnetic induction sensor (1) is connected with displacement computing unit (22), and described pumping signal generation module (21) is connected with displacement computing unit (22).
6. the high-accuracy position system based on electromagnetic induction according to claim 5, it is characterized in that, described displacement computing unit (22) comprises the signal amplification unit (221) that links to each other successively, shaping unit (222), zero passage detection unit (223), data acquisition unit (224) and signal processor (225), described signal amplification unit (221) is connected with electromagnetic induction sensor (1), described pumping signal generation module (21) is connected with signal processor (225), described frequency division counter unit (212) is connected with zero passage detection unit (223) by reference phase extraction unit (20), is connected with displacement data output unit (226) on the described signal processor (225).
7. the high-accuracy position system based on electromagnetic induction according to claim 6 is characterized in that, described signal processor (225) comprises the moving direction judging unit (2250) that can judge the testee moving direction.
8. according to claim 2 or 3 or 4 described high-accuracy position systems based on electromagnetic induction, it is characterized in that the length of described pitch (T) is 2nmm, n is a natural number.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764289A (en) * | 2016-08-18 | 2018-03-06 | 德克萨斯仪器股份有限公司 | For the method and apparatus for the degree of accuracy for improving digital converter of rotary transformer |
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| CN201724686U (en) * | 2010-07-15 | 2011-01-26 | 常州华辉电子设备有限公司 | High-accuracy positioning system based on electromagnetic induction |
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| CN2151819Y (en) * | 1993-01-11 | 1994-01-05 | 吉林工业大学 | Axially positioning device for rolling work |
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| US20100090688A1 (en) * | 2006-12-21 | 2010-04-15 | Micro-Epsilon Messtechnik Gmbh & Co., Kg | Method and sensor arrangement for determining the position and/or change of position of a measured object relative to a sensor |
| WO2009081310A1 (en) * | 2007-12-20 | 2009-07-02 | Koninklijke Philips Electronics N. V. | Positioning of magnetic coils in a sensor device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107764289A (en) * | 2016-08-18 | 2018-03-06 | 德克萨斯仪器股份有限公司 | For the method and apparatus for the degree of accuracy for improving digital converter of rotary transformer |
| CN107764289B (en) * | 2016-08-18 | 2021-10-08 | 德克萨斯仪器股份有限公司 | Method and apparatus for improving accuracy of resolver digitizer |
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Application publication date: 20101215 |