CN110161571B - Sinusoidal signal source system for metal foreign matter detector - Google Patents
Sinusoidal signal source system for metal foreign matter detector Download PDFInfo
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- CN110161571B CN110161571B CN201910559010.1A CN201910559010A CN110161571B CN 110161571 B CN110161571 B CN 110161571B CN 201910559010 A CN201910559010 A CN 201910559010A CN 110161571 B CN110161571 B CN 110161571B
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- 239000002184 metal Substances 0.000 title claims abstract description 18
- 239000000523 sample Substances 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims description 17
- 230000005672 electromagnetic field Effects 0.000 claims description 9
- 230000003321 amplification Effects 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000126 substance 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)
- Geophysics (AREA)
- 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 sine signal source system for a metal foreign matter detector, which comprises a controller, a signal processor, a power amplifier and a probe, wherein five sine wave generators are connected to the controller, the signal output end of each sine wave generator is connected with an independent signal amplifier, wherein the output end of the signal amplifier connected with a first sine wave generator is also connected with the power amplifier, the power amplifier is also connected with the probe, the output ends of the signal amplifiers connected with the other four sine wave generators are also connected with the signal processor, and the signal processor is also connected with the probe.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a sinusoidal signal source system for a metal foreign matter detector.
Background
The metal foreign matter detector is one device for detecting whether small metal particle foreign matter is mixed into product with alternating electromagnetic field, and the alternating electromagnetic field needs several sine wave signals with different parameters.
The existing common metal foreign matter detection machine generally adopts three paths of sine wave signals, wherein the amplitudes and the frequencies of the three paths of sine wave signals are the same, but the phases of the three paths of sine wave signals are different; the phase of one path of sine wave is adjustable, the sine wave is used for generating an alternating electromagnetic field through a power amplification device, the phase values of the sine waves of the other two paths of sine waves are fixed, the phase value of one path of sine wave is 0 degrees, and the phase value of one path of sine wave is 90 degrees.
The structure block diagram is shown in figure 1, and the first path of sine wave is transmitted to a transmitting coil of a metal foreign matter detector probe after signal amplification and power amplification to generate an alternating electromagnetic field for detection. When a product or foreign matter passes through the probe, the parameters of the alternating electromagnetic field change correspondingly, and a receiving coil on the probe senses the change of the alternating electromagnetic field. Because of the reasons of power amplification, a transmitting coil and a receiving coil, a phase difference alpha exists between a signal sensed on the receiving coil and a sine wave 1 of a source, and when the phase of the sine wave 1 is changed from 0 degrees to 360 degrees, the phase of the signal sensed on the receiving coil corresponds to the change of alpha to 360 degrees plus alpha; however, the change is not necessarily linear, as shown in fig. 2, the frequency and amplitude of the second and third paths of sine waves are the same as those of the first path of sine waves, but the phase value is fixed, the phase value of one path is 0 °, and the phase value of the other path is 90 °, so that an orthogonal coordinate system is formed. The signals sensed by the two paths of sine waves and the receiving coil on the probe are input to the signal processing module. And in the signal processing module, the induction signal on the receiving coil is projected on a coordinate system formed by the second path of sine wave and the third path of sine wave, so that two component signals X and Y are obtained. By shifting the phase of the first sinusoidal signal, the values of the component signals X, Y are changed accordingly, as shown in fig. 3.
There are two general ways to detect whether or not small metal particles are mixed in the product to be tested:
First, changing the phase of the first sine wave projects the component signal X, Y of the normal product into equal value on the coordinate system. Thus, when a normal product passes through the probe, |x|| -y|=0, while the product containing the metal foreign matter passes through when the probe is in use, the ratio of the number of the probes to the number of the probes is not equal to 0.
Second, changing the phase of the first sine wave projects the component signals X, Y of the normal product on a coordinate system to be equal to 0, i.e., x=0, or y=0; thus, x=0, or y=0, when a normal product passes through the probe, and x+note0, or y+note0, when a product containing metallic foreign matter passes through the probe.
The two modes are suitable for different types of products, and the same product is mixed with metal foreign matters with different materials and sizes.
The sinusoidal signal source system of the metal foreign matter detection machine has two problems:
1. when the phase of the sinusoidal signal for generating the detection electromagnetic field is adjusted, the phase of the induction signal on the receiving coil is not necessarily changed linearly, which can lead to the detection precision of the detected product corresponding to the phase of a certain range to be reduced;
2. during detection, the projection mode of the signal cannot be changed so as to obtain the optimal detection effect.
Disclosure of Invention
The present invention is directed to a sinusoidal signal source system for a foreign metal detector, which solves the above-mentioned problems.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The utility model provides a sinusoidal signal source system for metal foreign matter detection machine, includes controller, signal processor, power amplifier and probe, be connected with five sine wave generators on the controller, every sine wave generator's signal output part all is connected with independent signal amplifier, wherein the signal amplifier output part that is connected with first way sine wave generator still is connected with power amplifier, power amplifier still connects the probe, the signal processor is all connected to the signal amplifier output part that all other four ways sine wave generator are connected, signal processor still connects the probe, the inside transmitting coil and the receiving coil of being equipped with of probe.
As a further technical scheme of the invention: the transmitting coil is connected with the power amplifier.
As a further technical scheme of the invention: the receiving coil is connected with the signal processor.
As a further technical scheme of the invention: the model of the sine wave generator is AD9832.
As a further technical scheme of the invention: the model of the sine wave generator is AD9833.
As a further technical scheme of the invention: the phase values of the sine waves sent by the first path of sine wave generator are fixed, the phase values of the sine waves sent by the other four paths of sine wave generators can be adjusted, but the phase difference between the sine waves is fixed, and the phase difference between the four paths of sine waves is 90 degrees, 45 degrees and-45 degrees respectively.
As a further technical scheme of the invention: the second and third sine waves form an orthogonal coordinate system, the fourth and fifth sine waves form an orthogonal coordinate system, and the two coordinate systems share an origin but are different in angle by 45 degrees.
Compared with the prior art, the invention has the beneficial effects that: the sinusoidal signal source system for the metal foreign matter detector is used for product detection after four paths of sinusoidal waves are amplified by signals, has high detection precision, and enables the values of X2 and Y2 of projection of the induction signals on the receiving coil to be equal.
Drawings
Fig. 1 is an overall schematic diagram of the prior art.
Fig. 2 is a graph showing the phase of a signal sensed on a receiving coil and the phase of a first path sine wave according to the prior art.
Fig. 3 is a graph of the curvature of the prior art split vector signals X, Y.
Fig. 4 is an overall schematic of the present invention.
Fig. 5 is a schematic diagram of the coordinate system of the second, third, fourth and fifth sine waves of the present invention.
Fig. 6 is a schematic diagram of the coordinate system of the projection X1, Y1, X2, Y2 of the sensing signal on the receiving coil on two coordinate systems according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: referring to fig. 4-6, a sinusoidal signal source system for a foreign metal detector includes a controller, a signal processor, a power amplifier and a probe, wherein a transmitting coil and a receiving coil are arranged in the probe, five sinusoidal wave generators are connected to the controller, the signal output end of each sinusoidal wave generator is connected with an independent signal amplifier, the output end of the signal amplifier connected with the first sinusoidal wave generator is also connected with the power amplifier, the power amplifier is also connected with the transmitting coil, the output ends of the signal amplifiers connected with the other four sinusoidal wave generators are all connected with the signal processor, and the receiving coil is connected with the signal processor. The sine signal system consists of five paths of sine waves, each path of sine wave can be generated by DDS (such as AD9832, AD9833 and the like of ADI) or other modes, and the amplitude and the frequency of each path of sine wave are the same but the phases are different; the phase value of one path of sine wave is fixed, and the sine wave is used for generating an alternating electromagnetic field for detection after signal amplification and power amplification; in addition, the phase values of four paths of sine waves can be adjusted, but the phase difference between the four paths of sine waves is fixed, and the phase difference between the four paths of sine waves is 90 degrees, 45 degrees and-45 degrees respectively; the four paths of sine waves are amplified by signals and then used for product detection.
The second and third sine waves form an orthogonal coordinate system, the fourth and fifth sine waves form an orthogonal coordinate system, and the two coordinate systems share an origin but are different in angle by 45 degrees.
During detection, the sine wave 2, the sine wave 3, the sine wave 4 and the sine wave 5 simultaneously move by the same phase value, and linear phase change can be realized by the sine wave generated in a digital mode such as DDS, so that when the sine wave 2, the sine wave 3, the sine wave 4 and the sine wave 5 are moved, relative linear change is realized by the induction signal on the receiving coil.
The projections of the sensing signals on the receiving coil on two coordinate systems are respectively X1, Y1, X2 and Y2. The angles of the coordinate systems are shifted such that the values of X1 and Y1 of the projection of the inductive signal on the receiving coil are equal, i.e., |x1|= |y1|, because the angles of the two coordinate systems differ by 45 °, at which time y2=0 of the projection of the inductive signal on the receiving coil is made. When a normal product passes through the probe, |x1| -y1|=0, and |y2|=0, when a product containing a metal foreign substance passes through the probe, |x| -y|noteq0, and |y2|noteq0. We can also make the values of X2 and Y2 of the projection of the sense signal on the receiving coil equal.
In this way, we can obtain the optimal detection effect.
Embodiment 2 differs from embodiment 1 in that the sine wave of the present design can be generated by using AD9832 and AD9833 chips such as ADI, which is small in size and high in integration, and the generated sine wave signal is stable.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (3)
1. The sine signal source system for the metal foreign matter detector comprises a controller, a signal processor, a power amplifier and a probe, and is characterized in that five sine wave generators are connected to the controller, the signal output end of each sine wave generator is connected with an independent signal amplifier, the output end of the signal amplifier connected with a first path of sine wave generator is also connected with the power amplifier, the power amplifier is also connected with the probe, the output ends of the signal amplifiers connected with the other four paths of sine wave generators are all connected with the signal processor, the signal processor is also connected with the probe, a transmitting coil and a receiving coil are arranged in the probe, the phase value of the first path of sine wave is fixed, and the signal amplifier and the power amplifier are used for generating an alternating electromagnetic field for detection; in addition, the phase values of four paths of sine waves can be adjusted, but the phase difference between the four paths of sine waves is fixed, and the phase difference between the four paths of sine waves is 90 degrees, 45 degrees and-45 degrees respectively; the second sine wave and the third sine wave form an orthogonal coordinate system, the fourth sine wave and the fifth sine wave form an orthogonal coordinate system, the two coordinate systems share an origin, but the angles are different by 45 degrees, the model of the sine wave generator is AD9832, and the model of the sine wave generator is AD9833.
2. The sinusoidal signal source system for a metal foreign object detection machine of claim 1 wherein the transmit coil is connected to a power amplifier.
3. The sinusoidal signal source system for a metal foreign object detection machine of claim 1 wherein the receiver coil is connected to a signal processor.
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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 true CN110161571B (en) | 2024-05-17 |
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|---|---|---|---|---|
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| CN102298159A (en) * | 2010-06-22 | 2011-12-28 | 上海多科电子科技有限公司 | Metal detector |
| CN103149594A (en) * | 2013-01-15 | 2013-06-12 | 同济大学 | Metal detecting door with parameter automatic setting function |
| KR20150059305A (en) * | 2013-11-22 | 2015-06-01 | 엘지디스플레이 주식회사 | Apparatus for outputting a driving signal and display device and method of driving the display device using the same |
| KR20160005181A (en) * | 2014-07-03 | 2016-01-14 | 아이탑스오토모티브 주식회사 | Inductive sensing type position detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9787297B2 (en) * | 2012-12-13 | 2017-10-10 | Nec Corporation | Signal generator, signal generation method, and numerically controlled oscillator |
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2019
- 2019-06-26 CN CN201910559010.1A patent/CN110161571B/en active Active
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| CN102298159A (en) * | 2010-06-22 | 2011-12-28 | 上海多科电子科技有限公司 | Metal detector |
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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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| Title |
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