CN110161571A - A kind of sine signal source system for metal foreign body detector - Google Patents
A kind of sine signal source system for metal foreign body detector Download PDFInfo
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- CN110161571A CN110161571A CN201910559010.1A CN201910559010A CN110161571A CN 110161571 A CN110161571 A CN 110161571A CN 201910559010 A CN201910559010 A CN 201910559010A CN 110161571 A CN110161571 A CN 110161571A
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- 239000002184 metal Substances 0.000 title claims abstract description 19
- 239000000523 sample Substances 0.000 claims abstract description 20
- 230000001939 inductive effect Effects 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 abstract description 7
- 230000005672 electromagnetic field Effects 0.000 description 6
- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000013528 metallic particle Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B28/00—Generation of oscillations by methods not covered by groups H03B5/00 - H03B27/00, including modification of the waveform to produce sinusoidal oscillations
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- Environmental & Geological Engineering (AREA)
- Electromagnetism (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Power Engineering (AREA)
- Theoretical Computer Science (AREA)
- Geophysics And Detection Of Objects (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention discloses a kind of sine signal source systems for metal foreign body detector, including controller, signal processor, power amplifier and probe, there are five sine-wave generators for connection on the controller, the signal output end of each sine-wave generator is respectively connected with independent signal amplifier, the signal amplifier output end wherein connecting with first via sine-wave generator is also connected with power amplifier, power amplifier is also connected with probe, the signal amplifier output end of remaining No. four sine-wave generator connection is all connected with signal processor, signal processor is also connected with probe, sine signal source system of the present invention for metal foreign body detector is used for product testing after amplifying using four road sine waves by signal, with detection accuracy height, so that the value of the X2 and Y2 of the projection of the inductive signal on receiving coil are equal.
Description
Technical field
The present invention relates to signal processing technology field, specifically a kind of sine signal source system for metal foreign body detector
System.
Background technique
Metal foreign body detector is a kind of different using whether minute metallic particle has been mixed into alternating electromagnetic field testing product
The equipment of object, the generation of alternating electromagnetic field and product testing need the sine wave signal of a few road different parameters.
Existing frequently-used metal foreign body detector is generally to use three road sine wave signals, their amplitude and frequency phase
Together, but phase is different；Wherein phase-adjustable section all the way, this road sine wave is by power amplifier device for generating alternating electromagnetism
, in addition the phase value of the sine wave of two-way is fixed, and phase value all the way is 0 °, and phase value all the way is 90 °.
Its structural block diagram is as shown in Figure 1, first via sine wave is transmitted to metallic foreign body after signal amplification and power amplification
On the transmitting coil of detection machine probe, the alternating electromagnetic field of detection is generated.When having product or foreign matter passes through probe, alternation electricity
The parameter in magnetic field can occur to change accordingly, and the receiving coil on probe then incudes this variation of alternating electromagnetic field.Because logical
The sine wave 1 of the reason of having crossed power amplification, transmitting coil and receiving coil, the signal and source that sense on receiving coil is deposited
In phase difference α, when the phase of sine wave 1 is from 0 ° ~ 360 ° changes, the phase of the signal sensed on receiving coil is then corresponded to
The change of α ~ 360 °+α；But its change be not necessarily it is linear, as shown in Fig. 2, the frequency and width on the second road and third road sine wave
Value is identical as the frequency of first via sine wave and amplitude, but phase value is fixed, and phase value all the way is 0 °, the phase value of another way
It is 90 °, constitutes an orthogonal coordinate system.Two-way sine wave and the signal that upper receiving coil senses of popping one's head in all are input at signal
Manage module.The coordinate system that inductive signal on signal processing module, receiving coil is constituted on the second road and third road sine wave
Upper projection obtains two points of vector signals X, Y.By the phase of mobile first via sine wave signal, divide vector signal X, the value of Y
It is corresponding to change, as shown in Figure 3.
Whether mode has been mixed into minute metallic particle foreign matter to detect there are two types of general in test product:
The first, the phase for changing first via sine wave divides vector signal X, Y to project into phase on coordinate system normal product
It is equivalent.In this way, when normal product passes through probe, | X |-| Y |=0, and when the product containing metallic foreign body passes through probe | X |-| Y |
≠0。
Second, the phase for changing first via sine wave divides vector signal X, Y to project on coordinate system normal product
It is equal to 0, i.e. X=0 or Y=0 at one；In this way, X=0 or Y=0 when normal product passes through probe, and the product containing metallic foreign body
X ≠ 0 or Y ≠ 0 when passing through probe.
Two ways is suitble to different types of product and like products is mixed into the metallic foreign body of unlike material and size.
Above-mentioned metal foreign body detector sine signal source system has two:
1, the phase of inductive signal is not necessarily when adjustment is for generating the phase for detecting the sinusoidal signal of electromagnetic field, on receiving coil
Linear change, this will lead to the detection accuracy decline of the corresponding test product of phase of some range；
2, when detecting, the projection pattern of signal cannot be changed, to obtain optimal detection effect.
Summary of the invention
It is above-mentioned to solve the purpose of the present invention is to provide a kind of sine signal source system for metal foreign body detector
The problem of being proposed in background technique.
To achieve the above object, the invention provides the following technical scheme:
A kind of sine signal source system for metal foreign body detector, including controller, signal processor, power amplifier and
It pops one's head in, there are five sine-wave generators, the signal output end of each sine-wave generator to be respectively connected with for connection on the controller
Independent signal amplifier, wherein the signal amplifier output end connecting with first via sine-wave generator is also connected with power and puts
Big device, power amplifier are also connected with probe, and the signal amplifier output end of remaining No. four sine-wave generator connection is all connected with letter
Number processor, signal processor are also connected with probe, and probe is internal to be equipped with transmitting coil and receiving coil.
As further technical solution of the present invention: the transmitting coil connects power amplifier.
As further technical solution of the present invention: the receiving coil connection signal processor.
As further technical solution of the present invention: the model AD9832 of the sine-wave generator.
As further technical solution of the present invention: the model AD9833 of the sine-wave generator.
As further technical solution of the present invention: the phase value for the sine wave that first via sine-wave generator issues is solid
Fixed, the sine wave phase value that remaining No. four sine-wave generator issues is adjustable, but between phase difference fix, four roads sine
Phase difference between wave is 90 °, 45 ° and -45 ° respectively.
As further technical solution of the present invention: the second road and third road sine wave constitute an orthogonal coordinate system, the
Four roads and the 5th road sine wave constitute an orthogonal coordinate system, and two coordinate systems are total to origin, but angle differs 45 °.
Compared with prior art, the beneficial effects of the present invention are: the present invention is used for the sinusoidal signal of metal foreign body detector
Source system is used for product testing after amplifying using four road sine waves by signal, has detection accuracy high, so that on receiving coil
Inductive signal projection X2 and Y2 value it is equal.
Detailed description of the invention
Fig. 1 is the overall schematic of the prior art.
Fig. 2 is the phase and the variation song of first via sine wave phase of the signal sensed on the receiving coil of the prior art
Line chart.
Fig. 3 is that the prior art divides vector signal X, the Qu Xingtu of Y.
Fig. 4 is overall schematic of the invention.
Fig. 5 is the coordinate system schematic diagram on the second tunnel of the invention, third road, the 4th road and the 5th road sine wave.
Fig. 6 is the coordinate of projection X1, Y1, X2, Y2 of the inductive signal on two coordinate systems on receiving coil of the present invention
It is schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1: Fig. 4-6, a kind of sine signal source system for metal foreign body detector, including control are please referred to
Device, signal processor, power amplifier and probe, probe is internal to be equipped with transmitting coil and receiving coil, connects on the controller
It connecing there are five sine-wave generator, the signal output end of each sine-wave generator is respectively connected with independent signal amplifier,
In the signal amplifier output end that is connect with first via sine-wave generator be also connected with power amplifier, power amplifier also connects
Transmitting coil is connect, the signal amplifier output end of remaining No. four sine-wave generator connection is all connected with signal processor, receives line
Enclose connection signal processor.For the sinusoidal signal system by five road sine wave components, every road sine wave can be with DDS(such as ADI's
AD9832, AD9833 etc.) or other modes generation, the amplitude of every road sine wave is identical with frequency, but phase is different；It is sinusoidal all the way
The phase value of wave is fixed, by the alternating electromagnetic field for being used to generate detection after signal amplification and power amplification；Other four tunnel is just
The phase value of string wave is adjustable, but between phase difference fix, the phase difference between four road sine waves be respectively 90 °, 45 ° and-
45°；Four road sine waves are used for product testing after amplifying by signal.
Second road and third road sine wave constitute an orthogonal coordinate system, and the 4th road and the 5th road sine wave are constituting one just
Coordinate system is handed over, two coordinate systems are total to origin, but angle differs 45 °.
When detection, sine wave 2, sine wave 3, sine wave 4, sine wave 5 while mobile identical phase value pass through DDS etc.
Linear phase variation may be implemented in the sine wave digitally generated, in this way when mobile sine wave 2, sine wave 3, sine wave 4, just
When string wave 5, opposite linear change that the inductive signal on receiving coil is just realized.
Projection of the inductive signal on two coordinate systems on receiving coil is respectively X1, Y1, X2, Y2.Moving coordinate system
Angle so that the value of the X1 and Y1 of the projection of the inductive signal on receiving coil are equal, i.e., | X1 |=| Y1 |, because of two seats
The angle of mark system differs 45 °, at this moment, so that Y2=0 of the projection of the inductive signal on receiving coil.When normal product passes through spy
When head, | X1 |-| Y1 |=0, and | Y2 |=0, when the product containing metallic foreign body passes through probe | X |-| Y | ≠ 0, and | Y2 | ≠ 0.I
It is also possible that the value of the X2 and Y2 of the projection of the inductive signal on receiving coil are equal.
In this way, we are obtained with optimal detection effect.
Embodiment 2, and is in place of the difference of embodiment 1, the sine wave of the design can with such as ADI AD9832,
AD9833 chip generates, not only small in size, and integrated level is high, and the sine wave signal generated is stablized.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (7)
1. a kind of sine signal source system for metal foreign body detector, including controller, signal processor, power amplifier
And probe, which is characterized in that there are five sine-wave generator, the signal of each sine-wave generator is defeated for connection on the controller
Outlet is respectively connected with independent signal amplifier, wherein the signal amplifier output end connecting with first via sine-wave generator is also
Power amplifier is connected, power amplifier is also connected with probe, and the signal amplifier of remaining No. four sine-wave generator connection is defeated
Outlet is all connected with signal processor, and signal processor is also connected with probe, is equipped with transmitting coil and receiving coil inside the probe.
2. a kind of sine signal source system for metal foreign body detector according to claim 1, which is characterized in that institute
State transmitting coil connection power amplifier.
3. a kind of sine signal source system for metal foreign body detector according to claim 1, which is characterized in that institute
State receiving coil connection signal processor.
4. a kind of sine signal source system for metal foreign body detector according to claim 1, which is characterized in that institute
State the model AD9832 of sine-wave generator.
5. a kind of sine signal source system for metal foreign body detector according to claim 1, which is characterized in that institute
State the model AD9833 of sine-wave generator.
6. -5 any a kind of sine signal source system for metal foreign body detector according to claim 1, feature
It is, the phase value for the sine wave that first via sine-wave generator issues is fixed, remaining No. four sine-wave generator issues just
String wave phase value is adjustable, but between phase difference fix, the phase difference between four road sine waves be respectively 90 °, 45 ° and-
45°。
7. a kind of sine signal source system for metal foreign body detector according to claim 6, which is characterized in that the
Two roads and third road sine wave constitute an orthogonal coordinate system, and the 4th road and the 5th road sine wave constitute an orthogonal coordinate system,
Two coordinate systems are total to origin, but angle differs 45 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910559010.1A CN110161571B (en) | 2019-06-26 | 2019-06-26 | Sinusoidal signal source system for metal foreign matter detector |
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|---|---|---|---|
| CN201910559010.1A CN110161571B (en) | 2019-06-26 | 2019-06-26 | Sinusoidal signal source system for metal foreign matter detector |
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| CN110161571B CN110161571B (en) | 2024-05-17 |
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Citations (9)
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|---|---|---|---|---|
| JPH06337752A (en) * | 1993-05-28 | 1994-12-06 | Pentel Kk | Coordinate detection device |
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| US20150311890A1 (en) * | 2012-12-13 | 2015-10-29 | Nec Corporation | Signal generator, signal generation method, and numerically controlled oscillator |
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-
2019
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| US20150311890A1 (en) * | 2012-12-13 | 2015-10-29 | Nec Corporation | Signal generator, signal generation method, and numerically controlled oscillator |
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| CN105676297A (en) * | 2016-04-21 | 2016-06-15 | 上海明强智能技术有限公司 | All metal foreign substance detection device used for aluminum foil packed products |
| CN205982670U (en) * | 2016-08-31 | 2017-02-22 | 上海太弘威视安防设备有限公司 | Metal detection door with multifrequency is from balance function |
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