magnetometr y theoretical and experimental research
DESCRIPTION
MAGNETOMETR Y Theoretical and experimental research. Baltag Octavian Ioan. Ligns of force of the geomagnetic field (Glatzmaier et Roberts, 1995). http://paleomag.uqar.ca/spip.php?article44. 1971 B.Sc. in Physics - specialized in Electroradiophysics "Alexandru Ioan Cuza" University of Iasi - PowerPoint PPT PresentationTRANSCRIPT
11
MAGNETOMETRYTheoretical and
experimental research
Baltag Octavian IoanBaltag Octavian Ioan
Ligns of force of the geomagnetic field (Glatzmaier et Roberts, 1995). http://paleomag.uqar.ca/spip.php?article44
22
1971 B.Sc. in Physics - specialized in 1971 B.Sc. in Physics - specialized in Electroradiophysics "Alexandru Ioan Cuza" Electroradiophysics "Alexandru Ioan Cuza" University of IasiUniversity of Iasi
1982 Ph.D. with a thesis entitled 1982 Ph.D. with a thesis entitled "Contributions to development of low "Contributions to development of low magnetic fields magnetometers"magnetic fields magnetometers" Central Institute of Physics - BucurestiCentral Institute of Physics - Bucuresti
33
THEORETICAL AND APPLICATIVE THEORETICAL AND APPLICATIVE RESARCH IN MAGNETOMETRY RESARCH IN MAGNETOMETRY
DIRECTIONS 1971 - 2001DIRECTIONS 1971 - 2001
MAGNETOMETRYMAGNETOMETRY Space applicationsSpace applications Marine applications and naval Marine applications and naval
degaussing degaussing Terrestrial – special applicationsTerrestrial – special applications Laboratory – research & industryLaboratory – research & industry
MAGNETIC DETECTIONMAGNETIC DETECTION Magnetic naval and Magnetic naval and
terrestrial mines terrestrial mines Industrial applications -Industrial applications -
buried metallic bodiesburied metallic bodies
METROLOGMETROLOGYY,,
TRANSDUCERS & SPECIAL TRANSDUCERS & SPECIAL DEVICESDEVICES
PROTECTION OF INTELECTUAL & INDUSTRIAL PROPERTYPROTECTION OF INTELECTUAL & INDUSTRIAL PROPERTY Patents Patents TrademarksTrademarks
ELECTROMAGNETIC ELECTROMAGNETIC COMPATIBILITYCOMPATIBILITY
Special applicationsSpecial applications Research & industryResearch & industry
44
HIGH RESOLUTION MAGNETOMETRYHIGH RESOLUTION MAGNETOMETRY BBiomedical iomedical applicationsapplications
MICROWAVE MICROWAVE RADIOMETRRADIOMETRYY Microwave Microwave TThhermografermografy y – – early early detectidetection of the on of the
breast cancerbreast cancer
RESEARCH DOMAIN 2001 - 2008RESEARCH DOMAIN 2001 - 2008
55
MAGNETOMETRYMAGNETOMETRY
Theoretical & experimental research on the fluxgate transducers for Theoretical & experimental research on the fluxgate transducers for low magnetic fieldlow magnetic field
U2fh
I ex
h h
H
ex
H
ex
h + Hex
h - Hex
h
Hex
U2f
Iex
h
h U2f
Iex
Iex
h
ferrofluid
66
Fluxgate diagramFluxgate diagram
B
H
B
t
+Bs
-Bs
d/dt
t
h>0h=0
t
H=H0sint
h>0
Core I
Core II
tU2f
H
77
RESULTS AND APPLICATIONSRESULTS AND APPLICATIONS
Research on the fluxgate Research on the fluxgate transducers & transducers & magnetometmagnetometer er electronics –electronics – applications forapplications for Intercosmos satellitesIntercosmos satellites
Technical data:• range: +/- 80.000 nT• frequency of pulse excitation: 2 kHz,• second harmonic: 4 kHz• noise: < 1 nT• nonlinearity : < 1%• applications: triaxial magnetometer for Intercosmos satellites
88
FLUXGATE WITH MULTIPLE PATH OF FLUXFLUXGATE WITH MULTIPLE PATH OF FLUXpatent RO, nr. 60.346, Int. Cl. G01R33/00patent RO, nr. 60.346, Int. Cl. G01R33/00
Fluxgate sensor with multiple path Fluxgate sensor with multiple path of fluxof flux, O. Baltag, D. , O. Baltag, D. Costandache„Costandache„ “ “Studies in applied Studies in applied electromagnetics and mechanics”, electromagnetics and mechanics”, vol.13, pp.337-340, 1998, Editor: V. vol.13, pp.337-340, 1998, Editor: V. Kose, J. Sievert, IOS Press- Kose, J. Sievert, IOS Press- Amsterdam, ISSN: 1383-7281Amsterdam, ISSN: 1383-7281
Specifications:• Measuring range: +/- 200.000nT• noise: < 1 nT• excitation: pulse • liniarity: < 1%
Core: permalloy processed by photogravure, trated in hidrogen, coil support: noril and cuartz powder
99
FLUXGATE WITH MULTIPLE PATH OF FLUXFLUXGATE WITH MULTIPLE PATH OF FLUX patent RO, nr. 60.346, Int. Cl. G01R33/00patent RO, nr. 60.346, Int. Cl. G01R33/00
1010
NONLINEAR RESONANCE PHENOMENA IN NONLINEAR RESONANCE PHENOMENA IN FLUXGATEFLUXGATE
Fluxgate transfer characteristic in nonlinear resonance regimeFluxgate transfer characteristic in nonlinear resonance regime
Specific phenomena:• In certain operation conditions the fluxgate transducer no longer works as a magnetic field sensor and it is generating an almost quasisinusoidal signal with a frequency equal to the odd or even harmonics of the excitation signal• The second harmonic phase can only be changed (with 180°) by applying a continuous or alternative magnetic field exceeding the threshold value characteristic to the regime.
1111
Fluxgate – nonlinear resonance
Transfer characteristic U2ω = f (h) of the fluxgate in second harmonic resonance regime
Hysteresis response to applied field of the fluxgate on second harmonic:
- UQ second harmonic quadrature component- US second harmonic, sinphasic component- UA second harmonic amplitude- H external magnetic field
U2f second harmonic amplitude
H external magnetic fieldUex excitation voltagef excitation frequency
1212
Nonlinear resonance - ApplicationsNonlinear resonance - Applications
Double pumping magnetometer and Double pumping magnetometer and measuring methodmeasuring method,, patent Ro, No. patent Ro, No. 67520, Int. Cl. 67520, Int. Cl. G01R33/02G01R33/02
Functional instability of ferromagnetic Functional instability of ferromagnetic sensor in nonlinear resonance regimesensor in nonlinear resonance regime, , digest, digest, IINTERMAG 96,NTERMAG 96, Seattle, 1996 Seattle, 1996
Pecularities of the fluxgate responses Pecularities of the fluxgate responses in the parametric resonance regime, in the parametric resonance regime, O. O. Baltag, D. Costandache, Baltag, D. Costandache, Sensors Sensors Letters, Vol. 7, No.3, pp. 276–277 (2009Letters, Vol. 7, No.3, pp. 276–277 (2009))
Excitation frequency f=2000Hz: first pumping frequency
External magnetic field frequency F=200Hz: second pumping frequency
1313
DOUBLE PUMPING MAGNETOMETERDOUBLE PUMPING MAGNETOMETERPatent RO, no. 67520, Int. Cl. Patent RO, no. 67520, Int. Cl. G01R33/02G01R33/02
Fluxgate responses U2f (second harmonic 2f) at second pumping field F=200Hz, and measuring field Ho
Second harmonic U2f of the fluxgate modulated in amplitude by second pumping field with frequency F=200Hz
Functional characteristics:• first pumping frequency (fluxgate excitation): f=2 kHz• second pumping frequency: F=200 Hz• noise: < 0,1 nT• measuring range: +/- 200.000 nT
1414
FERROFLUID FLUXGATE TRANSFERROFLUID FLUXGATE TRANSDDUCERUCER
Behaviour of some nonlinear devices with ferrofluid, O. Baltag, D. Costandache, Behaviour of some nonlinear devices with ferrofluid, O. Baltag, D. Costandache, C. Cotae, JMMM, vol. 157 , pp. 591,1996C. Cotae, JMMM, vol. 157 , pp. 591,1996
Magnetometer with ferrofluid sensor, Baltag O., D.Costandache, IEEE Magnetometer with ferrofluid sensor, Baltag O., D.Costandache, IEEE Instrumentation & Measurement Technology Conference IMTC 96, Brussels, Instrumentation & Measurement Technology Conference IMTC 96, Brussels, 1996, pp.263-265, ISBN: 0-7803-3312-8, IEEE Xplore, INSPEC Number: 1996, pp.263-265, ISBN: 0-7803-3312-8, IEEE Xplore, INSPEC Number: 53918105391810
Sensor with ferrofluid for magnetic measurements, O. Baltag, D. Costandache, Sensor with ferrofluid for magnetic measurements, O. Baltag, D. Costandache, IEEE Trans. on Instrumentation and Measurement, vol. 46, nr.2, pp. 629-631, IEEE Trans. on Instrumentation and Measurement, vol. 46, nr.2, pp. 629-631, 19971997
Nonlinear behaviour of the ferrofluid in orthogonal magnetic fields, O. Baltag, D. Nonlinear behaviour of the ferrofluid in orthogonal magnetic fields, O. Baltag, D. Costandache, JMMM, 201, pp.123-125, 1999Costandache, JMMM, 201, pp.123-125, 1999
The study of a magnetic fluid based sensor, C. Cotae, O. Baltag, R.Olaru, The study of a magnetic fluid based sensor, C. Cotae, O. Baltag, R.Olaru, D.Calarasu, D.Costandache, JMMM, 201, pp.393-397, 1999D.Calarasu, D.Costandache, JMMM, 201, pp.393-397, 1999
Sensor with ferrofluid for magnetic measurements, Sensor with ferrofluid for magnetic measurements, O. Baltag,O. Baltag, D. Costandache, D. Costandache, Conference on Precision Electromagnetic Measurements, Braunschweigh, June Conference on Precision Electromagnetic Measurements, Braunschweigh, June 1996, CPEM-96, pp.61-62, ISBN: 0-7803-3376-41996, CPEM-96, pp.61-62, ISBN: 0-7803-3376-4
1515
FERRITE FLUXGATEFERRITE FLUXGATE
GGaussmeter, O.Baltag, D. Costandache, IEEE Proceedings of the aussmeter, O.Baltag, D. Costandache, IEEE Proceedings of the International Symposium on Signal, Circuits & Systems, Iasi 1995, pp. 473International Symposium on Signal, Circuits & Systems, Iasi 1995, pp. 473
Magnetic field measurement with soft ferrite cored sensors, Baltag O., D. Magnetic field measurement with soft ferrite cored sensors, Baltag O., D. Costandache, 7-th, International Conference on Ferrites, Bordeaux,1996Costandache, 7-th, International Conference on Ferrites, Bordeaux,1996
Toroidal Fluxgate Sensor Compared in Dynamic Preisach Framework, Toroidal Fluxgate Sensor Compared in Dynamic Preisach Framework, Salceanu A., Baltag O., Costandache D., The 7-th European Magnetic Salceanu A., Baltag O., Costandache D., The 7-th European Magnetic Materials and Applications Conference, EMMA ‚98, Zaragoza, Spain, pp. 248Materials and Applications Conference, EMMA ‚98, Zaragoza, Spain, pp. 248
1616
AMORPHOUS AND NANOCHRISTALINE AMORPHOUS AND NANOCHRISTALINE FLUXGATEFLUXGATE
Preisach approach for modelling an Preisach approach for modelling an amorphous toroidal fluxgate sensor, A. amorphous toroidal fluxgate sensor, A. Salceanu, O. Baltag, D.Costandache, Salceanu, O. Baltag, D.Costandache, Sensor and Actuators, A, vol. 81, pp.207-211, Sensor and Actuators, A, vol. 81, pp.207-211, 1999, ISSN: 0925-40051999, ISSN: 0925-4005
Study of a magnetic field sensor with Study of a magnetic field sensor with nanocrystalline materials, Snanocrystalline materials, Saalceanu A., Baltag lceanu A., Baltag O., et all, Bul.Inst.Politehnic Iaşi, Tom XLV (IL), O., et all, Bul.Inst.Politehnic Iaşi, Tom XLV (IL), Fasc.5A, pp.381-384, 1999, ISSN 0258-9109Fasc.5A, pp.381-384, 1999, ISSN 0258-9109
Fluxgate sensor with nanocrystaline Fluxgate sensor with nanocrystaline ferromagnetic core, Baltag O.ferromagnetic core, Baltag O.,, M.Craus, D. M.Craus, D. Costandache, "43 Internationales Costandache, "43 Internationales Wissenschaftliches Kolloquium", Ilmenau , Wissenschaftliches Kolloquium", Ilmenau , sept. 1998sept. 1998
Study of a ferrite sensor for medium magnetic Study of a ferrite sensor for medium magnetic field intensity measurement, O. Baltag, D. field intensity measurement, O. Baltag, D. Costandache, A. Salceanu, Studies in applied Costandache, A. Salceanu, Studies in applied electromagnetics and mechanics, in „Studies in electromagnetics and mechanics, in „Studies in Applied Electromagnetics and Mechanics”, Applied Electromagnetics and Mechanics”, vol.18, Editori: P.di Barba, A. Savini, pp.665-vol.18, Editori: P.di Barba, A. Savini, pp.665-669, 2000, IOS Press-Amsterdam, ISSN: 669, 2000, IOS Press-Amsterdam, ISSN: 1383-72811383-7281
1717
ELECTRONIC CIRCUITS ELECTRONIC CIRCUITS FOR FLUXGATE MAGNETOMETERFOR FLUXGATE MAGNETOMETER
Electronic devices for fluxgate Electronic devices for fluxgate excitation and generating of excitation and generating of reference signalreference signal,, Patent RO., No. Patent RO., No. 8014080140 ( (19821982), Int. Cl. ), Int. Cl. G01G33/02G01G33/02
1818
ELECTRONIC CIRCUITS ELECTRONIC CIRCUITS FOR FLUXGATE MAGNETOMETERFOR FLUXGATE MAGNETOMETER
Negative feedback networkNegative feedback network
Fluxgate
Reference 2fFrequency divider 1/2
Synchro-nous
Detector
Phase shift
Selective amplifier
Excitationgenerator
Generator2f
f
D.C. AmplifierNegative feedback
circuit
ExcitationGenerator
SUe
h
hr
ir
Ur
Feedbackcoil
Ku , Ki , rr
Ur = Ue
Us
Reference 2f
1919
ELECTRONIC CIRCUITS ELECTRONIC CIRCUITS FOR FLUXGATE MAGNETOMETERFOR FLUXGATE MAGNETOMETER
Integrated hybrids circuits for Integrated hybrids circuits for magnetometrymagnetometry
- ceramics support - ceramics support
- resistors – laser trimming- resistors – laser trimming
- active components: integrated - active components: integrated circuits circuits
- packaging – epoxy resins and - packaging – epoxy resins and quartz powderquartz powder