CN203786279U - System for sampling and processing signals of vibrating specimen magnetometer - Google Patents
System for sampling and processing signals of vibrating specimen magnetometer Download PDFInfo
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- CN203786279U CN203786279U CN201420194555.XU CN201420194555U CN203786279U CN 203786279 U CN203786279 U CN 203786279U CN 201420194555 U CN201420194555 U CN 201420194555U CN 203786279 U CN203786279 U CN 203786279U
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Abstract
The utility model belongs to the technical field of electromagnetic processing and particularly relates to a system for sampling and processing signals of a vibrating specimen magnetometer. The system comprises one pre-amplification circuit, two operational amplification circuits, one addition circuit and one AC-DC conversion circuit. A vibration frequency signal passes through a first amplification circuit and then enters the addition circuit. A detection coil signal passes through the pre-amplification circuit, and then enters the first amplification circuit and the addition circuit. Two paths of signals are superposed via the addition circuit, and the amplitude of an AC signal after superposition is changed with the magnitude and direction of magnetization intensity. The AC signal enters the AC-DC conversion circuit to be converted into a DC signal. The system can distinguish the positive and the negative of sample magnetization direction during real-time synchronous measurement.
Description
Technical field
The utility model belongs to Electromagnetic Treatment technical field, be specifically related in a kind of vibrating sample magnetometer vibration frequency signal and detecting coil signal to carry out the device of sampling processing, the vibration frequency signal of especially can take carries out the system of signal stack and feedback as background.
Background technology
Vibrating sample magnetometer is a kind of highly sensitive magnetic moment measurement instrument.It adopts electromagnetic induction principle, measures the magnetic moment of the sample vibrating with fixed frequency and amplitude work at one group of detecting coil center.Its vibration frequency signal and detecting coil signal are sinusoidal signal, general separately processing after sampling, vibration frequency signal sends the control system of vibration source to as the feedback signal of closed-loop control, make the frequency of vibration source keep constant, and being the magnetic line of force, the signal of detecting coil cut produced signal, it changes direct current signal into and directly by reometer or voltage table, shows, or sends the coordinate figure that image processing system becomes a certain dimension in coordinate system to.But, identical with amplitude in sample vibration frequency, in the contrary situation of sample magnetization equal direction, the signal amplitude frequency of detecting coil output is all without changing, only in phase place, distinguish, after changing direct current signal into, both are identical, are difficult to distinguish the positive and negative of sample direction of magnetization when real-time synchronization is measured.
Summary of the invention
In order to overcome existing vibrating sample magnetometer signal sampling disposal system, be difficult to distinguish the positive and negative deficiency of magnetic sample direction when real-time synchronization is measured, the utility model provides a kind of signal sampling disposal system, this system not only can keep the basic function of original system, and just can distinguish easily the positive and negative of sample direction of magnetization without doing larger change.
The utility model solves the technical scheme that its technical matters adopts:
A kind of vibrating sample magnetometer signal sampling disposal system is provided, comprises: a pre-amplification circuit, 2 operational amplification circuits, an adding circuit and an alternating current-direct current permutation circuit; Wherein, vibration frequency signal enters adding circuit after the first operational amplification circuit; Detecting coil signal, through pre-amplification circuit, is sent into the first operational amplification circuit after amplifying, and then enters adding circuit; The amplitude of two paths of signals AC signal after adding circuit stack changes with size and the direction of the magnetization; Then enter alternating current-direct current permutation circuit, AC signal is converted to direct current signal.
In the utility model, the structure of two signal sources as shown in Figure 1.Comprise: vibrating arm 1, sample box 2, magnet steel 3, vibration frequency coil 4, detecting coil 5, electromagnet 6; Vibration frequency coil 4 and magnet steel 3 are positioned at one end of vibrating arm 1, and sample box 2, detecting coil 5 are positioned at the other end of vibrating arm 1, and are placed between the magnetic pole of electromagnet 6.
In the utility model, when the closed-loop control that vibration frequency signal is vibration frequency provides feedback also and detecting coil signal superimposed, the AC signal after stack is converted to direct current signal.
In the utility model, take vibration frequency signal as background signal, vibration frequency signal and detecting coil signal are superimposed.
In the utility model, pre-service vibration frequency signal and detecting coil signal before signal stack, make vibration frequency signal amplitude be greater than detecting coil signal.
Ultimate principle of the present utility model is as follows:
Utilize the mechanism that vibration frequency signal is identical with detecting coil signal frequency, vibration frequency signal is when providing feedback signal for closed-loop control, also as the background signal of detecting coil signal, superimposed with the signal of detecting coil; When magnetic field is forward, the sinusoidal signal of vibration frequency is identical with the sinusoidal signal phase place of detecting coil, and after stack, signal amplitude increases, and changes into show as curtage after direct current signal and increase; When magnetic field is while being reverse, the sinusoidal signal phase difference of pi phase place of the sinusoidal signal of vibration frequency and detecting coil, after stack, signal amplitude reduces, and shows as reducing of curtage after changing direct current signal into.
The beneficial effects of the utility model are, distinguish easily the positive and negative of sample direction of magnetization, and simultaneously also can be as the feedback signal of closed-loop control as the vibration frequency signal of background signal, simple in structure.
Accompanying drawing explanation
Fig. 1 is the structural map of two signal sources of the utility model.
Fig. 2 is the block scheme of the utility model signal processing system.
Fig. 3 is the oscillogram of the utility model signal when sample is not magnetized.
Fig. 4 is that the utility model is the oscillogram of timing signal in sample direction of magnetization.
Fig. 5 is the utility model in the oscillogram of sample direction of magnetization signal when negative.
Number in the figure: 1 is vibrating arm, 2 is sample box, and 3 is magnet steel, and 4 is vibration frequency coil, and 5 is detecting coil, 6 is electromagnet pole.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further illustrated.
In Fig. 1, sample box 2 and magnet steel 3 are arranged on same vibrating arm 1, vibration frequency coil 4 output be voltage or the current signal that the magnetic line of force of its cutting magnet steel 3 produces, detecting coil 5 output be voltage or the current signal that the magnetic line of force of sample produces that be magnetized in its cutting sample box 2, when vibrating arm 1 is during along its axial vibration, sample in sample box 2 and magnet steel 3 have identical vibration frequency, so the signal frequency of vibration frequency coil 4 and detecting coil 5 outputs is identical.
In Fig. 2, vibration frequency signal and detecting coil signal are after amplifying respectively, the closed-loop control that vibration frequency signal one tunnel is vibration frequency provides feedback, another road and detecting coil signal enter adding circuit and superpose, AC signal after stack is converted to direct current signal via ac-dc converter circuit again, then be shown in voltage or reometer, or input computer acquisition card carries out real-time synchronization collection.Wherein it should be noted that, before stack, the vibration frequency signal amplitude after amplifying must be greater than the detecting coil signal after amplifying.
In Fig. 3, because sample is not magnetized, the output of detecting coil no signal, only has vibration frequency signal after stack, be converted to background direct current signal.
In Fig. 4, sample direction of magnetization is for just, and the signal of detecting coil output is all identical with vibration frequency signal frequency, phase place, signal amplitude increase after stack, and the signal after conversion is greater than background direct current signal.
In Fig. 5, sample direction of magnetization is for negative, and the signal of detecting coil output is identical with vibration frequency signal frequency, but phase difference of pi phase place, after stack, signal amplitude reduces, and the signal after conversion is less than in background direct current signal.
Claims (3)
1. a vibrating sample magnetometer signal sampling disposal system, is characterized in that comprising: a pre-amplification circuit, 2 operational amplification circuits, an adding circuit and an alternating current-direct current permutation circuit; Wherein, vibration frequency signal enters adding circuit after the first operational amplification circuit; Detecting coil signal, through pre-amplification circuit, is sent into the first operational amplification circuit after amplifying, and then enters adding circuit; The amplitude of two paths of signals AC signal after adding circuit stack changes with size and the direction of the magnetization; Then enter alternating current-direct current permutation circuit, AC signal is converted to direct current signal;
Wherein, the structure of two signal sources is: involving vibrations bar, sample box, magnet steel, vibration frequency coil, detecting coil, electromagnet; Vibration frequency coil and magnet steel are positioned at one end of vibrating arm, and sample box, detecting coil are positioned at the other end of vibrating arm, and are placed between the magnetic pole of electromagnet.
2. vibrating sample magnetometer signal sampling disposal system according to claim 1, is characterized in that take that vibration frequency signal is as background signal, and vibration frequency signal and detecting coil signal are superimposed.
3. vibrating sample magnetometer signal sampling disposal system according to claim 1, is characterized in that the front pre-service vibration frequency signal of signal stack and detecting coil signal, makes vibration frequency signal amplitude be greater than detecting coil signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420194555.XU CN203786279U (en) | 2014-04-22 | 2014-04-22 | System for sampling and processing signals of vibrating specimen magnetometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420194555.XU CN203786279U (en) | 2014-04-22 | 2014-04-22 | System for sampling and processing signals of vibrating specimen magnetometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203786279U true CN203786279U (en) | 2014-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420194555.XU Expired - Fee Related CN203786279U (en) | 2014-04-22 | 2014-04-22 | System for sampling and processing signals of vibrating specimen magnetometer |
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| CN (1) | CN203786279U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333465A (en) * | 2019-07-22 | 2019-10-15 | 杨培成 | A kind of dynamic sample magnetic strength instrument |
-
2014
- 2014-04-22 CN CN201420194555.XU patent/CN203786279U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333465A (en) * | 2019-07-22 | 2019-10-15 | 杨培成 | A kind of dynamic sample magnetic strength instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20160422 |
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| CF01 | Termination of patent right due to non-payment of annual fee |