CN204439814U - Microwave ferromagnetic resonance experimental system - Google Patents
Microwave ferromagnetic resonance experimental system Download PDFInfo
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- CN204439814U CN204439814U CN201520122177.9U CN201520122177U CN204439814U CN 204439814 U CN204439814 U CN 204439814U CN 201520122177 U CN201520122177 U CN 201520122177U CN 204439814 U CN204439814 U CN 204439814U
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Abstract
The utility model discloses a kind of microwave ferromagnetic resonance experimental system, belong to ferromagnetic fields of measurement.This system comprises: microlock signal source, if microwave signal output terminal and microwave value display device, frequency is the degree of stability of 9.37GHz is 5 × 10
-6; Magnetic field providing apparatus, if providing end, magnetic field and current value display device; Measurement result display device, if signal receiving end; Sample resonance chamber, is located at providing end, magnetic field providing apparatus magnetic field, if microwave signal input end and signal output part; The microwave signal output terminal of microlock signal source is connected with the microwave signal input end in sample resonance chamber through waveguide coaxial converter, the first isolator, precision attenuator, the second isolator; Sample resonance chamber signal output part is connected with the signal receiving end of measurement result display device through the 3rd isolator, pyron detector.By magnetic field and the precision attenuator of the frequency and magnetic field providing apparatus that regulate microlock signal source, three point method is utilized accurately to measure ferromagnetic resonance line width Δ H.
Description
Technical field
The utility model relates to the apparatus field measuring microwave ferrite performance parameter, particularly relates to a kind of microwave ferromagnetic resonance experimental system of the ferromagnetic resonance line width for measuring microwave ferrite.
Background technology
Ferromagnetic resonance line width Δ H is one of key property index of gyromagnetic ferrite material, and it characterizes the loss of microwave ferrite material and the quality factor of microwave device.The measurement of the existing ferromagnetic resonance line width Δ H to gyromagnetic ferrite material is all adopt the mode of temporarily building experimental facilities to test, and current domestic existing testing apparatus microwave source degree of stability is lower, therefore measuring accuracy, only can meet experimental teaching and use.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of microwave ferromagnetic resonance experimental system, accurately can detect the ferromagnetic resonance line width Δ H of gyromagnetic ferrite material, and can be used for doing ferromagnetic material resonance laboratory at microwave frequency band, ferromagnetic resonance figure can be observed intuitively, thus solve the low problem of existing equipment measuring accuracy.
For solving the problems of the technologies described above, the utility model provides a kind of microwave ferromagnetic resonance experimental system, comprising:
Microlock signal source, is provided with microwave signal output terminal and microwave value display device, this microlock signal source frequency is 9.37GHz, degree of stability is 5 × 10
-6;
Magnetic field providing apparatus, is provided with providing end, magnetic field and current value display device;
Measurement result display device, is provided with signal receiving end;
Sample resonance chamber, is arranged in the providing end, magnetic field of described magnetic field providing apparatus, and this sample resonance chamber is provided with microwave signal input end and signal output part;
The microwave signal output terminal of described microlock signal source is connected with the microwave signal input end in described sample resonance chamber through waveguide coaxial converter, the first isolator, precision attenuator, the second isolator successively;
The signal output part in described sample resonance chamber is connected with the signal receiving end of described measurement result display device through the 3rd isolator, pyron detector successively.
The beneficial effects of the utility model are: be 5 × 10 by arranging degree of stability
-6high-precision Microwave lockin signal source, magnetic field providing apparatus and sample resonance chamber are through waveguide coaxial converter, the first isolator, precision attenuator, the second isolator and the 3rd isolator and pyron detector is organic is connected to form microwave ferromagnetic resonance experimental system, this system is by the magnetic field of the frequency and magnetic field providing apparatus that regulate microlock signal source and precision attenuator, utilize three point method accurately to measure ferromagnetic resonance line width Δ H, this system can measure ferromagnetic resonance line width Δ H more accurately in production and scientific research.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
The formation schematic diagram of the microwave ferromagnetic resonance experimental system that Fig. 1 provides for the utility model embodiment.
Embodiment
Be clearly and completely described the technical scheme in the utility model embodiment below, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on embodiment of the present utility model, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to protection domain of the present utility model.
A kind of microwave ferromagnetic resonance experimental system that Fig. 1 provides for the utility model embodiment, for Measurement accuracy ferromagnetic resonance line width Δ H, this system comprises:
Microlock signal source, is provided with microwave signal output terminal and microwave value display device, and the frequency of described microlock signal source is the degree of stability of 9.37GHz is 5 × 10
-6;
Magnetic field providing apparatus, is provided with providing end, magnetic field and current value display device;
Measurement result display device, is provided with signal receiving end;
Sample resonance chamber, is arranged in the providing end, magnetic field of magnetic field providing apparatus, and this sample resonance chamber is provided with microwave signal input end and signal output part;
The microwave signal output terminal of microlock signal source is connected with the microwave signal input end in sample resonance chamber through waveguide coaxial converter, the first isolator, precision attenuator, the second isolator successively;
The signal output part in sample resonance chamber is connected with the signal receiving end of measurement result display device through the 3rd isolator, pyron detector successively.
In said system, the precision of precision attenuator is ± 0.02dB; The Q value in sample resonance chamber is greater than 4500.
In said system, the frequency values display device of microlock signal source is numeric display unit, convenient reading intuitively.
In said system, magnetic field providing apparatus to be electrically connected with electromagnet by constant current source and to form, and electromagnet is provided with the providing end, magnetic field of hollow, constant current source is electrically connected current value display device, can indicate the current value of constant current source, current value display device adopts numeric display unit, convenient reading intuitively.Make electromagnet can provide 0 ~ 4000 Oe magnetic field range in its providing end, magnetic field as long as the constant current source output current range of adjustment of this magnetic field providing apparatus meets.
In said system, measurement result display device adopts numeric display unit, convenient reading intuitively.
In reality, microlock signal source, magnetic field providing apparatus and measurement result display device can integrate and become integral type instrument, are convenient to the integrated level of raising system.
This system, by regulating the frequency of microlock signal source, the magnetic field of magnetic field providing apparatus and precision attenuator, utilizes three point method to measure ferromagnetic resonance line width Δ H; Live width test specification: >=10 ~ 200Oe, live width test repeatability :≤10%; This system, by adopting the resonator cavity of high q-factor, High-precision Microwave lockin signal and the precision attenuator of constant current source, high precision, effectively improves the precision of measurement ferromagnetic resonance line width Δ H.
This system, except measurement ferromagnetic resonance line width Δ H, is also applicable to the specialties such as university physics and does ferromagnetic material resonance laboratory at microwave frequency band, can observe ferromagnetic resonance figure intuitively, also can describe resonance curve by instruction of papil.Native system adopts phase-locked microwave signal source, and be furnished with precision attenuator and the high stability constant current source of degree of precision, can measure the ferromagnetic live width of microwave more accurately, have higher repeatability, this system is applicable to production unit, scientific research and teaching unit.
Below in conjunction with specific embodiment, the utility model system is described further.
Utilize the process of said system measurement ferromagnetic resonance line width Δ H as follows:
In sample resonance chamber, sample bead is placed at electromagnetic field antinode place, the microwave exported from sample resonance chamber passes to pyron detector through the 3rd isolator, if this pyron detector is quadratic detection, then the reading of the digital indicator of microlock signal and constant current source is proportional to the microwave power of pyron detector, during measurement, the damping capacity of precision attenuator is placed in certain pad value, and (recommendation is placed on 0 scale, pad value is 0dB), sample is put into sample resonance chamber, the perturbation in sample resonance chamber rod is regulated to make microlock signal maximum with the reading of the detection indicating gauge of constant current source (now sample resonance chamber resonance frequency and microwave signal source frequency consistent), the electric current of about 2.0A is added to electromagnet again by microlock signal and constant current source, that electromagnet produces about 3200Oe steady magnetic field, it is regulated to make the reading of the detection indicating gauge of microlock signal and constant current source minimum, now the reading of detection indicating gauge is I α, (ferromagnetic resonance point) reads the dr (recommendation pad value is 0dB) of precision attenuator reading simultaneously.Turn off the output current of microlock signal and constant current source, adjustment precision attenuator makes the reading of detection indicating gauge be still I α, and the damping capacity reading precision attenuator is d
0(performance number that ferromagnetic resonance absorbs).Due to absorbed power during ferromagnetic resonance and away from the damping capacity increasing precision attenuator when resonating, the reading of detection indicating gauge is made to be I α reading, so the output power being added in fact pyron detector is consistent, namely whether the Detection law of such wave detector be operated in quadratic detection has nothing to do with it, and the damping capacity only changing precision attenuator is to measure absorbed power during ferromagnetic resonance, the computing formula according to IEC relevant criterion provides:
Calculate the damping capacity d of half-power point
1/2, then precision attenuator is placed in corresponding scale value, then constant current source electric current is added, regulate steady magnetic field H, respectively have+a H on the upper and lower both sides of H
1/2with-H
1/2, the reading reading detection indicating gauge with original identical time magnetic field value,
Then Δ H=(+H
1/2)-(-H
1/2);
In addition, by ferromagnetic resonance condition ω r=γ Hr and γ=ge/2mc, according to externally-applied magnetic field Hr and microwave frequency, the g factor can be tried to achieve.
When carrying out ferromagnetic resonance line width and measuring, notably the μ ' of sample can make the resonance frequency of resonator cavity offset (frequency dispersion effect).Obtaining resonance curve and live width accurately, will frequency dispersion be eliminated when measuring, make to be equipped with the sample resonance chamber frequency of sample all the time identical with the microwave frequency of output cavity (tuning).Therefore at pointwise mapping Ferromagnetic Resonance Absorption, be equivalent to the resonance frequency that each additional Constant charge soil will change resonator cavity a little, make it and microwave frequency tuning.
If not pointwise is tuning when measuring, the frequency dispersion effect of sample can not be ignored again (particularly when narrow Δ H), after the impact correctly considering frequency dispersion, also can make Δ H by correction formula from the P-H curve measured.
By above-mentioned steps, utilize system of the present utility model to measure conveniently, accurately and obtain ferromagnetic resonance line width Δ H.
The above; be only the utility model preferably embodiment; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claims.
Claims (6)
1. a microwave ferromagnetic resonance experimental system, is characterized in that, comprising:
Microlock signal source, is provided with microwave signal output terminal and microwave value display device, and the frequency of described microlock signal source is the degree of stability of 9.37GHz is 5 × 10
-6;
Magnetic field providing apparatus, is provided with providing end, magnetic field and current value display device;
Measurement result display device, is provided with signal receiving end;
Sample resonance chamber, is arranged in the providing end, magnetic field of described magnetic field providing apparatus, and this sample resonance chamber is provided with microwave signal input end and signal output part;
The microwave signal output terminal of described microlock signal source is connected with the microwave signal input end in described sample resonance chamber through waveguide coaxial converter, the first isolator, precision attenuator, the second isolator successively;
The signal output part in described sample resonance chamber is connected with the signal receiving end of described measurement result display device through the 3rd isolator, pyron detector successively.
2. microwave ferromagnetic resonance experimental system according to claim 1, is characterized in that, the precision of described precision attenuator is ± 0.02db.
3. microwave ferromagnetic resonance experimental system according to claim 1, is characterized in that, the Q value in described sample resonance chamber is greater than 4500.
4. the microwave ferromagnetic resonance experimental system according to any one of claims 1 to 3, is characterized in that, the frequency values display device of described microlock signal source is numeric display unit.
5. the microwave ferromagnetic resonance experimental system according to any one of claims 1 to 3, it is characterized in that, described magnetic field providing apparatus to be electrically connected with electromagnet by constant current source and to form, electromagnet is provided with the providing end, magnetic field of hollow, described constant current source is electrically connected described current value display device, described current value display device adopts numeric display unit.
6. the microwave ferromagnetic resonance experimental system according to any one of claims 1 to 3, is characterized in that, described measurement result display device adopts numeric display unit.
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|---|---|---|---|
| CN201520122177.9U CN204439814U (en) | 2014-09-16 | 2015-03-02 | Microwave ferromagnetic resonance experimental system |
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| CN201420532029 | 2014-09-16 | ||
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950518A (en) * | 2017-03-07 | 2017-07-14 | 中电海康集团有限公司 | The test device and method of ferromagnetic resonance |
| CN106950244A (en) * | 2017-02-27 | 2017-07-14 | 西安交通大学 | A kind of method that ferroelectricity relaxation phase transformation in ferroelectric is detected based on electron spin resonance |
| CN108459284A (en) * | 2017-02-20 | 2018-08-28 | 武汉市欧睿科技有限公司 | The ferromagnetic resonance experimental rig of Microwave Iron Oxide Elements |
| CN112816922A (en) * | 2021-01-29 | 2021-05-18 | 南京大学 | Coplanar waveguide ferromagnetic resonance measurement system and method |
-
2015
- 2015-03-02 CN CN201520122177.9U patent/CN204439814U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459284A (en) * | 2017-02-20 | 2018-08-28 | 武汉市欧睿科技有限公司 | The ferromagnetic resonance experimental rig of Microwave Iron Oxide Elements |
| CN106950244A (en) * | 2017-02-27 | 2017-07-14 | 西安交通大学 | A kind of method that ferroelectricity relaxation phase transformation in ferroelectric is detected based on electron spin resonance |
| CN106950244B (en) * | 2017-02-27 | 2019-03-01 | 西安交通大学 | A method of based on ferroelectricity-relaxation phase transformation in electron spin resonance detection ferroelectric |
| CN106950518A (en) * | 2017-03-07 | 2017-07-14 | 中电海康集团有限公司 | The test device and method of ferromagnetic resonance |
| CN106950518B (en) * | 2017-03-07 | 2020-07-31 | 中电海康集团有限公司 | Ferromagnetic resonance testing device and method |
| CN112816922A (en) * | 2021-01-29 | 2021-05-18 | 南京大学 | Coplanar waveguide ferromagnetic resonance measurement system and method |
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Address after: 100083 Xueyuan Road, Haidian District, Beijing, No. 5 Patentee after: Beijing Dahua Radio Instrument Co., Ltd. Address before: 100083 Xueyuan Road, Haidian District, Beijing, No. 5 Patentee before: Beijing Dahua Radio Instrument Factory |