CN112083361A - Method for enhancing trace magnetic moment measurement signal by adding magnetic particles - Google Patents
Method for enhancing trace magnetic moment measurement signal by adding magnetic particles Download PDFInfo
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- CN112083361A CN112083361A CN202010956471.5A CN202010956471A CN112083361A CN 112083361 A CN112083361 A CN 112083361A CN 202010956471 A CN202010956471 A CN 202010956471A CN 112083361 A CN112083361 A CN 112083361A
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 81
- 238000005259 measurement Methods 0.000 title claims abstract description 49
- 239000006249 magnetic particle Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 230000004907 flux Effects 0.000 claims description 7
- 230000005298 paramagnetic effect Effects 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 230000005415 magnetization Effects 0.000 claims description 4
- 239000002105 nanoparticle Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 241000238366 Cephalopoda Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
- G01R33/0029—Treating the measured signals, e.g. removing offset or noise
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention discloses a method for enhancing a trace magnetic moment measurement signal by adding magnetic particles, which comprises the following steps: s1: manufacturing magnetic particles without magnetic moment anisotropy; s2: uniformly mixing the magnetic particles prepared by the S1 with a non-magnetic setting material to prepare a solid with any shape; s3: placing the solid body made in S2 at the center of each sensing coil or magnetic field sensor or superconducting quantum interference component; s4: placing a sample to be measured in a range in which a sensing coil or a magnetic field sensor or a superconducting quantum interference component can detect signals for measurement; s5: during measurement, different external magnetic fields can be applied to the sample to be measured, vibration with a fixed measurement frequency or reciprocating movement is continuously applied to the sample to be measured in a certain mode, signals of the fixed measurement frequency in the sensing coil are extracted by using signal acquisition equipment, and the magnetic moment of the corresponding sample to be measured can be obtained by deducting the measurement signals contributed by S2.
Description
Technical Field
The invention particularly relates to a method for enhancing a micro magnetic moment measurement signal by adding magnetic particles.
Background
There are many apparatuses for measuring magnetic materials, and the basic apparatuses commonly used include a Superconducting QUantum Interference Magnetometer (SQUID) or a Vibrating Sample Magnetometer (VSM), but the apparatuses have the problem of weak measurement signals, which affects the accuracy of measuring the magnetism of a Sample to be measured.
In a general measurement technique, when measuring the magnetism of a sample to be measured, a vibrator is used to vibrate the sample to be measured at a certain frequency and amplitude. At the same time, a static magnetic field is applied to magnetize the sample to be measured. A set of sensing coils is placed near the sample to be measured to detect the signal voltage in the coil due to the magnetic flux variations caused by the vibrations of the magnetized sample. The signal level of the sensing coil is low, and although increasing the number of turns of the coil can increase the signal level, the resistance of the coil is also increased, which is not favorable for the sensitivity of measurement. The low signal level affects the accuracy of the magnetic measurement, and thus a method for enhancing the trace measurement signal is needed.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, the present invention provides a method for enhancing micro magnetic moment measurement signals by adding magnetic particles, which comprises uniformly mixing magnetic particles (such as paramagnetic or superparamagnetic particles or superparamagnetic nanoparticles) without magnetic moment anisotropy with a non-magnetic shaped material to form a solid, placing the solid in the center of each sensing coil or magnetic field sensor or superconducting quantum interference component, and placing the sample to be measured in the range of the sensing coil or magnetic field sensor or superconducting quantum interference component capable of detecting signals.
In order to achieve the above object, the present invention provides a method for enhancing a micro magnetic moment measurement signal by adding magnetic particles, comprising the following steps:
s1: manufacturing magnetic particles without magnetic moment anisotropy;
s2: uniformly mixing the magnetic particles prepared by the S1 with a non-magnetic setting material to prepare a solid with any shape;
s3: placing the solid body made in S2 at the center of each sensing coil or magnetic field sensor or superconducting quantum interference component;
s4: placing a sample to be measured in a range in which a sensing coil or a magnetic field sensor or a superconducting quantum interference component can detect signals for measurement;
s5: during measurement, different external magnetic fields can be applied to the sample to be measured, vibration with a fixed measurement frequency or reciprocating movement is continuously applied to the sample to be measured in a certain mode, signals of the fixed measurement frequency in the sensing coil are extracted by using signal acquisition equipment, and the magnetic moment of the corresponding sample to be measured can be obtained by deducting the measurement signals contributed by S2.
Preferably, in S1, the magnetic particles are paramagnetic or superparamagnetic particles or superparamagnetic nanoparticles, and magnetic moments inside the magnetic particles can change along the direction of the stray magnetic field or the external magnetic field of the sample to be measured or the superimposed magnetic field thereof at any time.
Preferably, in S2, the non-magnetic setting material is a polymer material, cement, gypsum, clay or other settable material.
Preferably, in S3, the sensing coil structure or magnetic field sensor or superconducting quantum interference assembly design may be single, double or multi-group paired.
More preferably, when there are pairs of multiplied sensing coils in S3, the pairs need to be connected in series and in reverse.
Preferably, in S5, the signal extraction method is: the change of the magnetic flux induced by the sensing coil is measured, and the paramagnetic or superparamagnetic particles also enhance the magnetic flux value, so that the induced electromotive force which is generated in proportion to the magnetization intensity is enhanced, and the corresponding electric signal result is captured by the signal capturing equipment.
Preferably, in S5, the driving manner of the sample to be tested to vibrate may be mechanical driving, electromagnetic driving, or other driving manners.
Compared with the prior art, the invention utilizes the magnetic particles without magnetic moment anisotropy to be uniformly mixed in the non-magnetic shaped material and made into a solid body which is arranged at the central position of each sensing coil or magnetic field sensor or superconducting quantum interference component, and then the sample to be measured is placed in the range of detectable signals of the sensing coil or magnetic field sensor or superconducting quantum interference component for measurement, thereby solving the problem of weak micro-magnetic moment measurement signals, enhancing the measurement signals and improving the measurement sensitivity.
Drawings
Fig. 1 is a schematic view of a magnetic measurement system according to an embodiment of the present invention.
The labels in the figure are: 1. a vibrator; 2. a sample rod; 3. a sample to be tested; 4. an electromagnet; 5. magnetic particles; 6. a sensing coil; 7. a signal acquisition device; 8. and (4) a computer.
Detailed Description
The following detailed description is to be read with reference to the drawings and specific examples.
The devices currently used for measuring the basic physical parameters of magnetic materials are superconducting quantum interference magnetometers or vibration sample magnetometers, and the magnetic measuring devices are hereinafter collectively referred to as magnetic measuring devices. The magnetic measurement equipment has the problem of weak measurement signals in the use process, which affects the accuracy of measuring the magnetism of the sample to be measured. The magnetic particle enhanced micro magnetic moment measurement signal is added, namely, the magnetic particles are added into a sensing coil of the magnetic measurement equipment to enhance the magnetic field, so that the measurement signal is enhanced, and preparation is made for accurately measuring the signal of the sample to be measured.
When the vibration sample magnetometer is used for actual measurement, the vibrator is used for driving a sample to be measured in a magnetization field to vibrate, the voltage of the vibrator is output to the signal acquisition equipment as a reference signal, the induced voltage of the sensing coil is transmitted to the signal acquisition equipment and output as direct current voltage, two voltages corresponding to each other are graphed to obtain a hysteresis loop, and the magnetic parameters of the sample to be measured in a certain magnetic field are obtained through the hysteresis loop.
The invention uses magnetic particles without magnetic moment anisotropy to be uniformly mixed in a non-magnetic setting material to be made into a solid body, the solid body is arranged at the central position of each sensing coil, and then a sample to be measured is arranged in the range of detectable signals of the sensing coil to be measured, so that the measurement signals of the sensing coil can be enhanced.
In view of this, the embodiment of the present invention provides a method for enhancing a micro magnetic moment measurement signal by adding magnetic particles, comprising the following steps: s1: manufacturing magnetic particles without magnetic moment anisotropy; s2: uniformly mixing the magnetic particles prepared by the S1 with a non-magnetic setting material to prepare a solid with any shape; s3: placing the solid body made of S2 at the center of each sensing coil; s4: placing a sample to be measured in a range of detectable signals of the sensing coil for measurement; s5: during measurement, different external magnetic fields can be applied to a sample to be measured, the sample to be measured in the magnetic field is driven by the vibrator to vibrate at a fixed measurement frequency, the voltage of the vibrator is output to the signal acquisition equipment to be used as a reference signal, the signal acquisition equipment is used for acquiring a signal of the fixed measurement frequency in the sensing coil, and the magnetic moment of the corresponding sample to be measured can be obtained by deducting the measurement signal contributed by S2.
The method comprises the following specific operation processes:
s1: magnetic particles without magnetic moment anisotropy are manufactured, the magnetic particles are paramagnetic or superparamagnetic particles or superparamagnetic nano particles, and the magnetic moments inside the magnetic particles can change along the direction of an dissipated magnetic field or an external magnetic field of a sample to be detected or the superposed magnetic field of the sample to be detected at any time.
S2: and (3) uniformly mixing the magnetic particles prepared by the step (S1) with a non-magnetic sizing material to prepare a solid in any shape, wherein the non-magnetic sizing material is a high polymer material, cement, gypsum, clay or other settable materials.
S3: placing the solid body made by S2 at the center of each sensing coil, wherein the sensing coil structure can be designed to be single, double or multi-group paired;
it should be noted that, when the sensing coils are multiplied in pairs in S3, the pairs need to be connected in series and in reverse.
S4: placing a sample to be measured in a range of detectable signals of the sensing coil for measurement;
s5: during measurement, different external magnetic fields can be applied to a sample to be measured, the sample to be measured in the magnetic field is driven by the vibrator to vibrate at a fixed measurement frequency, the voltage of the vibrator is output to the signal acquisition equipment to be used as a reference signal, the signal acquisition equipment is used for acquiring a signal of the fixed measurement frequency in the sensing coil, and the magnetic moment of the corresponding sample to be measured can be obtained by deducting the measurement signal contributed by S2.
In S5, the signal extraction method is as follows: the change of the magnetic flux induced by the sensing coil is measured, and the paramagnetic or superparamagnetic particles also enhance the magnetic flux value, so that the induced electromotive force which is generated in proportion to the magnetization intensity is enhanced, and the corresponding electric signal result is captured by the signal capturing equipment.
In S5, the driving method for the sample to be tested to vibrate may be mechanical driving, electromagnetic driving, or other driving methods.
The present invention describes preferred embodiments and effects thereof. Additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for enhancing a micro magnetic moment measurement signal by adding magnetic particles is characterized by comprising the following steps:
s1: manufacturing magnetic particles without magnetic moment anisotropy;
s2: uniformly mixing the magnetic particles prepared by the S1 with a non-magnetic setting material to prepare a solid with any shape;
s3: placing the solid body made in S2 at the center of each sensing coil or magnetic field sensor or superconducting quantum interference component;
s4: placing a sample to be measured in a range in which a sensing coil or a magnetic field sensor or a superconducting quantum interference component can detect signals for measurement;
s5: during measurement, different external magnetic fields can be applied to the sample to be measured, vibration with a fixed measurement frequency or reciprocating movement is continuously applied to the sample to be measured in a certain mode, signals of the fixed measurement frequency in the sensing coil are extracted by using signal acquisition equipment, and the magnetic moment of the corresponding sample to be measured can be obtained by deducting the measurement signals contributed by S2.
2. The method of claim 1, wherein in step S1, the magnetic particles are paramagnetic or superparamagnetic particles or superparamagnetic nanoparticles, and magnetic moments inside the magnetic particles can change along a direction of an stray magnetic field or an applied magnetic field of a sample to be measured or a superimposed magnetic field thereof at any time.
3. The method of claim 1, wherein in step S2, the non-magnetic setting material is polymer material, cement, gypsum, clay or other settable material.
4. The method of claim 1, wherein in step S3, the sensing coil structure or the magnetic field sensor or the superconducting quantum interference element design can be single, double or multi-group paired.
5. The method of claim 1, wherein the pairs of the sensing coils in S3 are multiplied by two pairs, wherein the pairs are connected in series and in reverse.
6. The method of claim 1, wherein in step S5, the signal is extracted by: the change of the magnetic flux induced by the sensing coil is measured, and the paramagnetic or superparamagnetic particles also enhance the magnetic flux value, so that the induced electromotive force which is generated in proportion to the magnetization intensity is enhanced, and the corresponding electric signal result is captured by the signal capturing equipment.
7. The method of claim 1, wherein in step S5, the driving means for driving the sample to be tested to vibrate may be mechanical driving, electromagnetic driving, or other driving means.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010956471.5A CN112083361A (en) | 2020-09-11 | 2020-09-11 | Method for enhancing trace magnetic moment measurement signal by adding magnetic particles |
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| CN202010956471.5A CN112083361A (en) | 2020-09-11 | 2020-09-11 | Method for enhancing trace magnetic moment measurement signal by adding magnetic particles |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113791371A (en) * | 2021-07-15 | 2021-12-14 | 苏州芯兴科技有限公司 | Sample carrying platform for measurement in magnetic field and use method |
| CN117148239A (en) * | 2023-10-30 | 2023-12-01 | 华中科技大学 | Method for measuring equivalent magnetic moment of magnetic particles and standard sample |
-
2020
- 2020-09-11 CN CN202010956471.5A patent/CN112083361A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113791371A (en) * | 2021-07-15 | 2021-12-14 | 苏州芯兴科技有限公司 | Sample carrying platform for measurement in magnetic field and use method |
| CN117148239A (en) * | 2023-10-30 | 2023-12-01 | 华中科技大学 | Method for measuring equivalent magnetic moment of magnetic particles and standard sample |
| CN117148239B (en) * | 2023-10-30 | 2024-02-20 | 华中科技大学 | Method for measuring equivalent magnetic moment of magnetic particles and standard sample |
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