CN103353614B - A kind of continuous temperature magnetic parameter measuring system and measuring method - Google Patents
A kind of continuous temperature magnetic parameter measuring system and measuring method Download PDFInfo
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Abstract
The invention discloses a kind of continuous temperature magnetic parameter measuring system and measuring method, measuring system comprises: sample cavity (1), computing machine (2), signal measurement acquisition system (3), machine driven system (4), temperature control system (5), flow delivery systems (6), insulating portion (7), magnetic shielding device (8) and magnetic field control system (9), and wherein signal measurement acquisition system (3) and machine driven system (4) two parts have worked in coordination with the measurement collection of multiple magnetic parameter; Temperature control system (5) and flow delivery systems (6) cooperate with each other and carry out accurate temperature control to sample (10); Magnetic shielding device (8) is for providing a lower magnetostatic environment, and magnetic field control system (9) loads predetermined magnetic field after reaching preset temperature, the collaborative work of computing machine (2) control system various piece.
Description
Technical field
The invention belongs to archeo magnetism Magnetic Measurement field, be specifically related to a kind of continuous temperature magnetic parameter measuring system and measuring method.
Background technology
The motion of earth's core inner fluid is originated from magnetic field of the earth, and its change is richly stored with the information of earth interior dynamic process.The condition that the research of earth history earth magnetic field intensity in period variation characteristic provides important for finally setting up geodynamic models.Therefore, carry out sampling from rock and obtain paleointensity data by the thermal reunite method of archaeomagnetism, just there is very important significance of scientific research.Can say, rock sample is the encrypt file that have recorded important information, and the process decoding these files is exactly the process that archaeomagnetism obtains paleointensity data.But the theory involved by magnetic field of the earth paleointensity measures is more more complex than ancient orientation measurement with experiment, and current paleointensity data, than ancient directional data much less, make people be difficult to the change in full appreciation earth history magnetic field of the earth in period.And then hinder the physical process utilizing magnetic field of the earth to explore earth interior.
And why paleointensity data volume is less, first because sample is complicated from collecting the link made, there is the influence factor of many unknowns, second be because the test job more complicated of sample, need constantly to repeat thermal reunite and measurement of residual magnetism on the temperature spot heated gradually, usual flow process is as follows: 100 degree, heating furnace-be heated to-cool-put into measuring system-measurement put into by sample, and---200 degree, heating furnace-be heated to-cool-put into measuring system-measurement put into by-sample, and--------sample put into 300 degree, heating furnace-be heated to-cool-put into measuring system-measurement--circulates with this, until add thermal measurement to required maximum temperature.Again the data of each temperature spot are carried out curve fitting afterwards, then carry out the data analysis in field, thus surveying work extremely effort is time-consuming, and the demagnetizing curve using a small amount of heating-up temperature point to simulate is also accurate not.And Part II reason is also one of bottleneck restricting the development of whole archeo magnetism field.For Inst of Geology and Geophysics, Chinese Academy of Sciences's archeo magnetism laboratory, whole experimentation just must carry out at FP-PTSD1 thermal reunite instrument and rock superconductive magnetometer two parts.Use thermal reunite instrument to carry out a point temperature section demagnetization to sample, re-use rock remanent magnetic measurement instrument afterwards and carry out Magnetic Measurement.But measuring system is separated with intensity stove in whole measuring process, some the part natural remanent magnetization determining temperature spot and partial thermoremanent magnetization information can only be obtained, and these temperature spot dispersion degrees are very large, such as 100,200,300 degree above-mentioned, therefore, the data of this temperature spot carry out the loss that matching causes a large amount of temperature section data.And magnetic mineral saturation magnetization can vary with temperature and change, the method only at room temperature measuring residual magnetization adds the complicacy of paleointensity theory.
Meanwhile, if the temperature environment of measurement can be set in arbitrary temperature spot by instrument, be also that an important instrument of magnetic fields is improved.Because a lot of magnetics parameter, such as SIRM (SIRM), anhysteretic remanent magnetization intensity (ARM) etc. are all very important magnetics parameters in rock magnetism, environmental magnetism, the former refers to that material acts on the maximum residual magnetization that can produce by stabilizing magnetic field (being generally 1T) at a certain temperature, not only relevant with magnetic mineral type but also relevant with its content; The latter refers in weak constant win stream magnetic field, the remanent magnetism making sample stand the strong and action of alternating magnetic field being reduced to zero evenly to obtain, responsive especially to the magnetic-particle of single domain.These magnetics parameters of now are all because the measurement environment of continuous alternating temperature useless, after certain high temperature can only be added, be cooled to indoor temperature measurement again, and these parameters are all closely bound up with the change of temperature, so, the limitation of this instrument greatly limit the application of these parameters, also adds the complexity that Paleomagnetism Parameters is explained.Comprehensive above reason, archeo magnetism field is in the urgent need to carrying out the instrument of real-time measurement of residual magnetism at continuous arbitrary temp point.
The current whole world does not still have the commercial apparatus can testing sample remanent magnetism in continuous temperature section, only has scientific research institution of France to build laboratory same quasi-instrument on probation.This Instrument Design thinking is use the temperature of well heater and the complete paired samples of water circulation system to control in magnetic shielding device inside, adopts the principle of oscillation sample to complete the collection of magnetic signal simultaneously.The shortcoming of this mentality of designing is: one is because well heater all needs energising to heat, and due to electromagnetic conversion principle, the well heater of energising will inevitably produce secondary magnetic field, this secondary magnetic field cannot be removed in the inside of shield assembly, again because it is near sample, so the measurement of the magnetic parameter of sample own can be affected greatly.Two what be that this method for designing adopts is oscillation sample Magnetic Measurement principle, and this method needs reciprocating vibration sample under a known magnetic field, uses the magnetic field that pick-up winding collected specimens generates afterwards, and then is finally inversed by the remanent magnetism of sample itself.Its shortcoming is that what to measure is a relative quantity, and each measurement all needs to use standard specimen to correct, and simultaneously its sensitivity of measuring is not high, can only reach 10
-5emu, will a low order of magnitude compared with high performance fluxgate magnetic core.
Summary of the invention
In order to solve the problem, the invention discloses a kind of continuous temperature magnetic parameter measuring system, comprise: sample cavity, computing machine, signal measurement acquisition system, machine driven system, temperature control system, flow delivery systems, insulating portion, magnetic shielding device and magnetic field control system, wherein signal measurement acquisition system and machine driven system two parts have worked in coordination with the measurement collection of multiple magnetic parameter; Temperature control system and flow delivery systems cooperate with each other and use heated air stream to carry out accurate temperature control to sample; Magnetic shielding device is for providing a lower magnetostatic environment, magnetic field control system loads predetermined magnetic field to sample area, the collaborative work of computer control system various piece, can measure under alternating temperature state, thus obtain the multiple magnetic parameter information such as continuous temperature Duan Shangru natural remanent magnetization, SIRM.
Wherein, described signal measurement acquisition system comprises magnetic probe control module, fluxgate magnetic core and data collecting card, wherein magnetic probe control module provides power supply and signal to encourage for fluxgate magnetic core, is electric signal that data collecting card provides the faint magnetic signal that detects of popping one's head in convert to simultaneously.
Wherein, machine driven system comprises driving stepper motor control card, stepper motor and Double-gear driving turntable, for measurement system building one can rotate the operating platform of sample test angle automatically, pinion wheel wherein in the nested Double-gear driving turntable of the rotation axis of stepper motor, pinion wheel motion drives bull gear drive, gear drive and then drive the fluxgate magnetic core on measuring table to rotate.
Wherein, temperature control system comprises thermopair, temperature controller and electric heater, wherein, be placed on the temperature that the thermocouple monitoring sample near sample reaches, computing machine sends temperature control instruction to temperature controller, the temperature data that temperature controller feeds back according to thermopair distributes the heating current that will reach required for target temperature in real time for electric heater, heating after electric heater energising, air heat flow delivery systems flow through, is delivered to sample cavity heated sample.
Wherein, air stream transportation system comprises blower fan and air channel, and blower fan is arranged on the bottom of measuring system, keeps the distance of more than a meter with sample measurement zone.
Wherein, magnetic field control system comprises programmable power supply and controls the control field coil that corresponding electric current is supplied to sample area by field coil programmable power supply magnetic field value as requested, and coil electricity produces magnetic field, the Magnetic control of complete paired samples.
Wherein, described insulating portion is the overall double thermal insulation specimen holder that nonmagnetic transparent quartz material is fired, and fills fire prevention temperature-resistant material in double-deck quartz wall.
Wherein, described magnetic shielding device comprises Superfine crystal material and encloses and make skin, and the internal layer be made up of permalloy.It also can only use wherein a kind of material to make.
The invention also discloses and adopt above-mentioned continuous temperature magnetic parameter measuring system to carry out the method measured, comprise the steps:
1) sample is put into sample cavity, and close hatch door, place magnetic shielding device;
2) series of parameters needed for institute's test sample product is inputted on computers;
3) computing machine controls magnetic field control system, makes magnetic field, sample area reach requirement;
4) system starts temperature control according to set target temperature value; Temperature maintenance is carried out according to the set retention time, to ensure that sample is by complete homogeneous heating after reaching target temperature;
5) signal measurement acquisition system and machine driven system collaborative work, after signal acquiring system gathered the data of a sample angle, machine driven system drives the probe of signal acquiring system to rotate, and measures after translation-angle again; After completing the measurement that rotates a circle, terminate the test to this temperature spot;
6) system is according to the temperature interval of target temperature point of heating, carries out step 4), 5) repetition;
7), after completing the measurement of all temperature spots to be measured, Computer calculates magnetic parameter value and carries out display preservation.
Wherein, in step 4) in, if the sample temperature that thermopair is checked through does not reach target temperature, then temperature controller provides electric current for electric heater, and electric heater generates heat, wind-force transmission system is opened, air is after electric heater is heated, and enter sample cavity heated sample, sample is after reaching target temperature, temperature controller provides a small amount of electric current to make system remain on target temperature, and the secondary magnetic field produced when the method for this use heated air stream heated sample can eliminate electric heater energising is on the impact of sample.
Wherein, step 2) in the parameter of input comprise the selection of magnetic parameter to be measured, the target temperature point (single temperature) of heating, the temperature interval (continuous temperature) of the target temperature point of heating, target temperature retention time, sample area magnetic field set, probe rotation steps angle.
Wherein, when measuring remanent magnetism, the probe of signal acquiring system carries out one-shot measurement around sample every certain angle, and after rotating a circle, Computer calculates orientation angle and the magnetic field intensity of the most high-intensity magnetic field intensity of sample, calculates residual induction by both.
Continuous temperature measurement of residual magnetism system of the present invention, opens the continuous temperature measurement technology of the archaeomagnetism field magnetization, measurement is combined with heating technique, and just energy is measured in the process of heating to make it, does not need to cool down; And can the warming room of control temperature every, the such as intensification of 1 degree 1 degree, measure once for 1 degree often liter, like this, the data volume of actual measurement is just abundant.The present invention can obtain the measurement result under continuous temperature, compensate in traditional measurement process, can only obtain the deficiency of discrete temperature dot information.Meanwhile, it can record the technology of magnetic parameter under warm-up mode, and overcome traditional instrument and to heat the deficiency be separated with measuring system, the technology measuring the magnetic parameters such as SIRM under making alternating temperature state is achieved.Meanwhile, because the present invention adopts the method for heated air stream heated sample, extremely effectively can eliminate the interference that secondary magnetic field that electric heater produces in electrified regulation process is measured sample, ensure that instrument test precision.This Instrument Design theory ground-breaking, manufacture craft is advanced, and accuracy of instrument, stability, all higher than design standards, provide solid technical device support for the test of archeo magnetism paleointensity realizes high-acruracy survey.This system has important science using value, has promotion prospect widely.
Accompanying drawing explanation
Fig. 1: continuous temperature magnetic parameter measuring system fundamental diagram;
Fig. 2: continuous temperature magnetic parameter measuring system structured flowchart;
Fig. 3: Double-gear driving turntable 43 dimensional drawing;
Fig. 4: quartzy heat insulation specimen holder dimensional drawing.
Description of reference numerals:
1-sample cavity;
2-computing machine;
3-signal measurement acquisition system;
31-magnetic probe control module; 32-fluxgate magnetic core; 33-data collecting card;
4-machine driven system;
41-driving stepper motor control card; 42-stepper motor; 43 Double-gear driving turntables;
5-temperature control system;
51-thermopair; 52-temperature controller; 53-electric heater;
6-flow delivery systems;
61-blower fan; 62-air channel;
7-insulating portion (the double thermal insulation specimen holder of the anti-guncotton of inner clip);
8-magnetic shielding device;
9-magnetic field control system;
91-programmable power supply; 92-controls field coil;
10-sample.
Embodiment
Below in conjunction with accompanying drawing, the present invention is specifically described.
As shown in Figure 1, 2, continuous temperature magnetic parameter measuring system of the present invention comprises several major parts such as sample cavity 1, computing machine 2, signal measurement acquisition system 3, machine driven system 4, temperature control system 5, flow delivery systems 6, insulating portion 7, magnetic shielding device 8 and magnetic field control system 9.
Wherein, sample cavity 1 is the placement fixed position of sample 10 in system; Computing machine 2 is responsible for each system of control system and is carried out collaborative work, and complete paired samples carries out magnetic parameter measurement on continuous temperature; Machine driven system 4 is responsible on demand by different angle in rotary moving for sample 10, high-precision signal measurement acquisition system 3 has been responsible for the measurement of magnetic induction density, and signal measurement acquisition system 3 and the collaborative work of machine driven system 4 two parts can complete the measurement collection of multiple magnetic parameter; Temperature control system 5 and flow delivery systems 6 cooperate with each other and use heated air stream to realize controlling the accurate temperature of sample 10; Insulating portion 7 is bilayer quartz framves of the anti-guncotton of inner clip, ensures the temperature not Environmental diffusion towards periphery of heated air stream; Magnetic shielding device 8 provides a lower magnetostatic environment, to ensure the high precision magnetic-field measurement of system for system; Magnetic field control system 9 can load predetermined magnetic field in heating and cooling process, to meet the needs of paleointensity experiment.
Below each ingredient is specifically described.
One, sample cavity
Sample cavity 1 is the space of the fixed sample 10 opened up on double thermal insulation specimen holder 7, it takes and has put a potsherd containing penetrating aperture on the gas channel of internal layer quartz wall formation, make sample 10 can be placed in sample cavity 1, and in outer quartz wall, devise quartz specimen hatch door to be opened/closed, sample cavity can be closed after sample is placed, ensure the effect of heat insulation of system.
Two, computing machine
For multi-purpose computer, but it has multiple COM port to realize each function of system.Wherein user operation software application LabVIEW language compilation, after the setting of user's completion system parameters on interface, computing machine 2 controls flow delivery systems 6 respectively, the temperature of the complete paired samples of temperature control system 5 controls; The magnetic field extra show requirement of the complete paired samples of controlling magnetic field control system 9; Control machine driven system 4 and Magnetic Measurement acquisition system 3 complete the collection to sample magnetic parameter.
Three, signal measurement acquisition system
Signal measurement acquisition system 3 comprises magnetic probe control module 31, fluxgate magnetic core 32, data collecting card 33.Wherein magnetic probe control module 31 had both been responsible for fluxgate magnetic core 32 provides power supply and signal to encourage, the electric signal that the faint magnetic signal that probe can be provided to detect for data collecting card 33 again converts to.Therefore, the process that signal measurement gathers is as follows: magnetic probe control module 31 receives the test instruction that computing machine 2 sends, for fluxgate magnetic core 32 provides power supply to encourage, corresponding magnetic field can be recorded after the probe 32 be placed near sample 10 receives excitation, this field signal is processed into the electric signal that can be read at magnetic probe control module 31 after, gathered by data collecting card 33, transmit back computing machine 2.
The Mag-03 triaxial magnetometer that fluxgate magnetic core 32 can select Ba Tingdun company of Britain to produce.The magnetometer of this compact has the high-performance fluxgate magnetic core of integrated electronic device, can carry out high-acruracy survey to stationary magnetic field and alternating magnetic field.Its measurement range comprises ± 70, ± 100, ± 250, ± 500 or ± 1000 μ T, encapsulate in several ways.This series probe can with the voltage driven of any ± 12V, and with three-phase simulation voltage system in 0-± 10V scope, proportional corresponding Bx, By and Bz export.Probe can with three different noise level supplies.The noise level of low noise version is less than 6pT rms/√ Hz when 1 Hz, can with all packaged type supplies except the encapsulation of MCT type, and range is ± 70, ± 100 μ T.
The USB-6251 data collecting plate card that data collecting card 33 can adopt America NI company to produce, it has 16 tunnel analog inputs (16), wherein sampling rate for each channel reaches 1.25 M/s, and can use NI-DAQmx drive software and NI LabVIEW SignalExpress interactive data logging software.NI USB-6251 is a USB high speed M series multifunctional DAQ module, under high sampling rate, also can keep high precision.The installation of its plug and play farthest reduces configuration and setup times, and it can directly be connected with screw terminal simultaneously, thus reduces cost and simplify the connection of signal.NI-DAQmx driver and measurement service software provide the configuration and programming interface that are simple and easy to, and the functions such as DAQ Assistant can shorten the development time.Therefore, its dynamic signal acquisition application just required for native system and the ideal chose of cooperation sensor measurement.
Four, machine driven system
Machine driven system comprises driving stepper motor control card 41, stepper motor 42, and Double-gear driving turntable 43 etc., for measurement system building one can rotate the operating platform of sample test angle automatically.
Wherein, computing machine 2 sends instruction to driving stepper motor control card 41, drived control card 41 needs the step number of running according to command calculations stepper motor, and control step motor 42 moves, pinion wheel in the rotation axis of stepper motor 42 is nested Double-gear driving turntable 43, pinion wheel motion drives bull gear drive, gear drive and then drive the rotation of fluxgate magnetic core 32 on measuring table to complete the change of instrument probe counter sample angle, software simultaneously control signal measurement acquisition system 3 pairs of samples is measured, thus the sample completing robotization full angle is measured.
In the control problem of resolution system to stepper motor and measurement of residual magnetism instrument, native system is by adopting the control of LabVIEW software programming realization to system, and in establishment interface, user can arrange test sample number, each sample test number of times, sample takes measurement of an angle interval etc.When working procedure, the G language of program is converted to the ASCII character that measurement of residual magnetism instrument and stepper motor can identify, to realize the control to the two by serial ports.Wherein, size gear ratio is 198:38, and diameter is than being 400:80.Fig. 3 is Double-gear driving turntable 43 dimensional drawing.
Five, temperature control system
Temperature control system 5 comprises: thermopair 51, temperature controller 52, electric heater 53.Wherein, the temperature that monitoring sample reaches is responsible for by the thermopair 51 be placed near sample 10; Computing machine 2 sends temperature control instruction to temperature controller 52, the temperature data that temperature controller feeds back according to thermopair 51 distributes the heating current that will reach required for target temperature in real time for electric heater 53, electric heater 53 will generate heat after being energized, by the air heat that flow delivery systems 6 flows through, be delivered to sample cavity 1 heated sample 10.
R type thermopair selected by thermopair 51, has precision high, the advantage that temperature drift is little.
The 2604 type temperature controllers that temperature controller 52 selects Eurotherm company to produce.This temperature controller be a kind of modular can free configuration, high precision, high performance temperature and process controller.It has single loop, two-circuit or three circuit patterns.Each loop is except can being arranged to tandem as except common pid loop, the control loops such as ratio.It is furnished with 7 buttons, for switching various state of a control and amendment parameter.Because it has the pattern controlling at most three heating circuits, so make system can have the potential function of the multistage heating of large sample or the Multi-example heating of Future Development.In actual use, the height that its accuracy of temperature control is also suitable, can reach 0.1 DEG C, and therefore, on temperature controls, this system can complete the temperature performance index of room temperature to 800 DEG C, can meet design requirement completely.
Electric heater 53 can select nickel chromium triangle electric furnace heating wire.This stove silk has excellent inoxidizability, relatively preferably anti-carburizing energy, has good corrosion resistance when polluting by sulfur-bearing atmosphere sulfur-bearing atmosphere and surface.Be widely used in the industries such as industrial furnace, metallurgy, machinery, electrical equipment, aircraft, automobile making, military project and make heater element and resistive element.
Six, air stream transportation system
The air stream transportation system 6 of system is made up of blower fan 61 and air channel 62.The magnetic field produced when moving to prevent blower fan is measured sample and is produced interference, blower fan 51 is designed the bottom in system, maintain a certain distance (preferably 1 meter) with sample measurement zone, add the effect of shielding harness like this, fan blower 51 will be got rid of completely on the impact that sample is measured.In order to ensure the realization of heating power, can select 330W, rotating speed is at the centrifugal blower of 3000r/min.The pipeline that can bend that transmission pipeline selects aluminium foil to make, pipe end access electric heater 53, after making air heat, passes into sample cavity 1, like this, just achieves the heat transfer of air-flow.
Seven, insulating portion
In order to ensure the needs of high temperature test, simultaneously in view of native system is to the superelevation requirement of magnetic parameter, devise the overall double thermal insulation specimen holder 7 fired by nonmagnetic transparent quartz material, fill the heat-barrier material such as ceramic fiber wherein with the air themperature guaranteed air stream transportation system 6 and transport not Environmental diffusion towards periphery, simultaneously, specimen holder 7 entirety is all made by non-magnetic material, ensure that in measuring process and does not introduce other interference.The heat insulation specimen holder dimensional drawing of quartz is shown in Fig. 4.
Eight, magnetic shielding device
The interference excluding surrounding magnetic field to make native system in Magnetic Measurement process and produce it, must use the test zone of magnetic shielding device 8 pairs of systems to carry out magnetic shielding.Magnetic shielding material the most frequently used at present has ultracrystallite and permalloy two kinds, wherein Superfine crystal material is easy to advantages such as processing, cheap, but because its magnetic permeability is high less than permalloy, therefore needing to enclose the more number of plies of system than more than 100nT in the magnetic shielding of below 100nT can realize; Although permalloy magnetic permeability is high, expensive, processing difficulties.This bi-material all can separately as the magnetic shielding material of this patent, but consider the factor of the aspect such as price and processing, preferred version of the present invention is: first use the Superfine crystal material system of enclosing outer, after treating that the shielding in magnetic field reaches 100nT rank, innermost layer re-uses the internal layer shielding bucket manufactured by permalloy, because its magnetic permeability is higher, effectively environmental magnetic field can be dropped to scope within comparatively ideal 20nT.
Nine, magnetic field control system
Mensuration due to some magnetic parameters needs to provide the magnetic field of specifying and requiring to sample, and therefore native system devises magnetic field control system.The magnetic field control system 9 of system comprises programmable power supply 91 and control field coil 92.Send instruction in computing machine 2 to programmable power supply 91, corresponding electric current is supplied to the control field coil 92 of sample area by power supply magnetic field value as requested, and coil electricity produces magnetic field, the Magnetic control of complete paired samples.
Ten, sample
Native system test the standard model that sample 10 is archeo magnetism field.Concrete specification is: high 2cm, the cylindrical rock sample of diameter 2.54cm; Or the cube Loess Samples of 2cm.
Describing below in conjunction with accompanying drawing 1-4 adopts measuring system of the present invention to carry out the process measured.
First sample 10 is put into sample cavity 1 by 1, and closes hatch door, places magnetic shielding device 7.Input the series of parameters needed for institute's test sample product afterwards on the computer 2, computing machine, according to inputted parameter, starts to control each several part and carries out work.
The parameter of 2 inputs comprises measures which kind of magnetic parameter (such as remanent magnetism, SIRM (SIRM)); The target temperature point (single temperature spot measurement) of heating; The temperature interval (measurement of continuous temperature point) of the target temperature point of heating; The target temperature retention time; The setting in magnetic field; Probe rotation steps angle etc.
The selection of A wherein magnetic parameter can have two classes: the first kind is vector parameters, be exactly both needed to survey intensity size, what need again to survey the strongest direction in angle, this kind of parameter take remanent magnetism as representative, remanent magnetism comprises three parameters, intensity, magnetic declination and magnetic dip, these three parameters are calculated by size and Orientation.Because this class parameter needs direction of measurement, so just need driven by motor driven by rotary disc to pop one's head in carry out the wheel measuring at least one week around sample, namely mechanical rotation system is measured with measurement acquisition system cooperative cooperating.Equations of The Second Kind is scalar parameter, only need to measure the value of sample on fixed-direction, this kind of parameter with SIRM (SIRM) for representative, it needs the sample value measuring sample loading magnetic direction of different temperature points after loading saturation magnetic field (be generally and be greater than 1T), so just do not need the work of machine driven system.And the traditional measurement method of this kind of parameter is as follows: be separated with heating system owing to measuring, sample is needed first to add saturation field, heat again, measure again after cooling, therefore measured value is value at ambient temperature, but can by the impact of temperature on this parameter theory, therefore, the value that different temperatures is measured is different.Classic method cannot be measured when heating, and the feature that the present invention can measure under the condition of heating measures the magnetic parameters such as SIRM technology under making alternating temperature state is achieved.
If B only needs the data measuring some temperature spots, user needs the target temperature point (single temperature spot measurement) arranging heating;
If C needs to measure the data (such as 20-700 every 50 degree of measurements point) in continuous temperature section, need the temperature interval (measurement of continuous temperature point) of the target temperature point that heating is set.
The D target temperature retention time, different samples needs the different target temperature retention times to guarantee that sample enough heats on design temperature.
The setting in E magnetic field, guarantees that sample is in set magnetic field.
F probe rotation steps angle, when measuring vector, probe needs at least within one week, to measure the strongest direction that just can calculate sample around sample, therefore, probe rotation steps angle is less, and pendulous frequency is more, the result calculated is also more accurate, but the corresponding test duration also can increase.
3 computing machines are coil power supply according to the setup control programmable power supply 91 in magnetic field, make magnetic field, sample area reach requirement.
4 systems start temperature according to set target temperature value and control, the sample temperature detected as thermopair does not reach target temperature, then temperature controller provides electric current for electric heater, electric heater generates heat, and wind-force transmission system is opened, and air is after electric heater is heated, enter sample cavity heated sample, sample is after reaching target temperature, and the target temperature retention time that system is arranged according to user, controlling temperature controller provides a small amount of electric current to make system remain on target temperature to electric heater.After retention time terminates, enter test link.
If what 5 users measured is the such vector parameters of remanent magnetism, signal measurement acquisition system and machine driven system collaborative work, probe carries out one-shot measurement around sample every certain angle, after rotating a circle, the orientation angle that computing machine can calculate the most high-intensity magnetic field intensity of sample is how many, and magnetic field intensity is how many, and both can calculate residual induction and (comprise magnetic dip, magnetic declination, field strength values); If what measure is the such scalar of SIRM, then system only need control signal acquisition device of mechanical rotation system and probe moved to aligning and add field direction and carry out measurement and gather.
If 6 users' tests is the data of single temperature spot, so after 4,5 liang of EOSs, computer accounting calculates magnetic parameter value and carries out display preservation; If user's test is test in continuous temperature section, so system can carry out the repetitions of 4,5 liang of steps according to the temperature interval of the target temperature point of heating, until complete the measurement of all temperature spots to be measured.
Claims (8)
1. a continuous temperature magnetic parameter measuring system, it is characterized in that, comprise: sample cavity (1), computing machine (2), signal measurement acquisition system (3), machine driven system (4), temperature control system (5), flow delivery systems (6), insulating portion (7), magnetic shielding device (8) and magnetic field control system (9), sample cavity (1) is arranged in insulating portion (7), insulating portion (7) is arranged in magnetic shielding device (8), machine driven system (4) can rotate the operating platform of sample test angle automatically for measurement system building one, signal measurement acquisition system (3) and machine driven system (4) two parts have worked in coordination with the measurement collection of multiple magnetic parameter, air stream transportation system (6) is arranged on the bottom of measuring system, be connected with sample cavity (1) through insulating portion (7) by transmission pipeline, temperature control system (5) and flow delivery systems (6) cooperate with each other and use heated air stream to carry out temperature control to sample (10), magnetic shielding device (8) is for providing a magnetostatic environment, magnetic field control system (9) loads predetermined magnetic field to sample area, the collaborative work of computing machine (2) control system various piece, can measure under alternating temperature state, thus obtains multiple magnetic parameter information in continuous temperature section.
2. continuous temperature magnetic parameter measuring system according to claim 1, it is characterized in that, described signal measurement acquisition system (3) comprises magnetic probe control module (31), fluxgate magnetic core (32) and data collecting card (33), wherein magnetic probe control module (31) provides power supply and signal to encourage for fluxgate magnetic core (32), the electric signal that the faint magnetic signal that probe detects converts to is supplied to data collecting card (33) simultaneously.
3. continuous temperature magnetic parameter measuring system according to claim 2, it is characterized in that, machine driven system (4) comprises driving stepper motor control card (41), stepper motor (42), with Double-gear driving turntable (43), pinion wheel wherein in the nested Double-gear driving turntable (43) of the rotation axis of stepper motor (42), pinion wheel motion drives bull gear drive, gear drive and then drive the fluxgate magnetic core (32) on measuring table to rotate.
4. the continuous temperature magnetic parameter measuring system according to Claims 2 or 3, it is characterized in that, temperature control system (5) comprises thermopair (51), temperature controller (52) and electric heater (53), wherein, be placed on the temperature that thermopair (51) the monitoring sample near sample (10) reaches, computing machine (2) sends temperature control instruction to temperature controller (52), the temperature data that temperature controller (52) feeds back according to thermopair (51) distributes the heating current that will reach required for target temperature in real time for electric heater (53), heating after electric heater (53) energising, by the air heat that flow delivery systems (6) flows through, be delivered to sample cavity (1) heated sample (10), the secondary magnetic field that the method for this use heated air stream heated sample produces when can eliminate electric heater (53) energising is on the impact of sample, air stream transportation system (6) comprises blower fan (61) and air channel (62), and blower fan (61) is arranged on the bottom of measuring system, keeps the distance of more than a meter with sample measurement zone.
5. continuous temperature magnetic parameter measuring system according to claim 4, it is characterized in that, magnetic field control system (9) comprises programmable power supply (91) and control field coil (92), corresponding electric current is supplied to the control field coil (92) of sample area by programmable power supply (91) magnetic field value as requested, control field coil (92) energising produces magnetic field, the Magnetic control of complete paired samples.
6. the continuous temperature magnetic parameter measuring system according to claim 1-3,5 any one, it is characterized in that, the overall double thermal insulation specimen holder that described insulating portion (7) is fired for nonmagnetic transparent quartz material, fills fire prevention temperature-resistant material in double-deck quartz wall; Described magnetic shielding device (8) comprises the skin that Superfine crystal material is made, and the internal layer made of permalloy or be only made up of wherein a kind of material.
7. adopt the continuous temperature magnetic parameter measuring system described in any one of 1-6 to carry out the method measured, it is characterized in that, comprise the steps
1) sample (10) is put into sample cavity (1), and close hatch door, place magnetic shielding device (8);
2) series of parameters needed for computing machine (2) upper input institute test sample product, described parameter comprises the selection of magnetic parameter to be measured, the target temperature point of heating, the temperature interval of the target temperature point of heating, target temperature retention time, sample area magnetic field set and probe rotation steps angle;
3) computing machine controls magnetic field control system (9), makes magnetic field, sample area reach requirement;
4) system starts temperature control according to set target temperature value, if the sample temperature that the thermopair of temperature control system (5) is checked through does not reach target temperature, then the temperature controller of temperature control system (5) provides electric current for electric heater, and electric heater generates heat, and air stream transportation system (6) is opened; Air is after electric heater is heated, enter sample cavity heated sample, sample is after reaching target temperature, and temperature controller provides a small amount of electric current to make system remain on target temperature, temperature maintenance is carried out according to the set retention time, to ensure that sample is by complete homogeneous heating after reaching target temperature;
5) signal measurement acquisition system (3) and machine driven system (4) collaborative work, after signal acquiring system gathered the data of a sample angle, machine driven system drives the probe of signal acquiring system to rotate, and measures after translation-angle again; After completing the measurement that rotates a circle, terminate the test to this temperature spot;
6) system is according to the temperature interval of target temperature point of heating, carries out step 4), 5) repetition;
7), after completing the measurement of all temperature spots to be measured, Computer calculates magnetic parameter value and carries out display preservation.
8. method according to claim 7, when measuring remanent magnetism, the fluxgate magnetic core (32) of signal measurement acquisition system (3) carries out one-shot measurement around sample every certain angle, after rotating a circle, Computer calculates orientation angle and the magnetic field intensity of the most high-intensity magnetic field intensity of sample, calculates residual induction by both.
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