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
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
33
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
44
MAGNETOMETRY – NAVAL & MARINE APPLICATIONSMAGNETOMETRY – NAVAL & MARINE APPLICATIONS Magnetic protection of shipsMagnetic protection of ships
55
MAGNETOMETRY – NAVAL & MARINE APPLICATIONSMAGNETOMETRY – NAVAL & MARINE APPLICATIONS Methods and installations for magnetic protection of ships Methods and installations for magnetic protection of ships
Triaxial magnetometer for SAD installations Triaxial magnetometer for SAD installations control of control of Cercetari in vederea realizarii unui Cercetari in vederea realizarii unui magnetometru triaxial pentru comanda magnetometru triaxial pentru comanda instalatiilor SAD pentru navele dragoare de mineinstalatiilor SAD pentru navele dragoare de mine
66
Degaussing current
MAGNETOMETRY – NAVAL & MARINE APPLICATIONSMAGNETOMETRY – NAVAL & MARINE APPLICATIONS
Romanian degaussing ships: “AUTOMATICA” & “”
http://www.defencetalk.com/pictures/surface-ships/p11192-rsrb-36-degaussing-ship.html
Degaussing ship
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Dragging of the degaussing cable around of ship
MAGNETOMETRY – NAVAL & MARINE APPLICATIONSMAGNETOMETRY – NAVAL & MARINE APPLICATIONS
www.aetherometry.com/.../uft_degaussing.html
http://www.fas.org/man/dod-101/navy/docs/swos/eng/62B-303.html
88
Three channel magnetometerThree channel magnetometer
Old URSS naval fluxgate
Aplications: Aplications: measuring of the measuring of the vertical magnetic fieldvertical magnetic field
• power: 220V/50Hz, 12V power: 220V/50Hz, 12V dc. dc. • 3 channels galvanic 3 channels galvanic separatelyseparately• range:range: 80.000 nT 80.000 nT• manual compensation: manual compensation: 60.000 nT60.000 nT• display: 3 1/2 digitdisplay: 3 1/2 digit• maximum immersion maximum immersion depth: 40m,depth: 40m,
99
Counter – magnetic mine technology:Counter – magnetic mine technology:Triaxial magnetometer for “Triaxial magnetometer for “SADSAD” systems protection ” systems protection of mine sweeperof mine sweeper
Characteristics and performance:Characteristics and performance: Magnetometric channel: 3 orthogonal Magnetometric channel: 3 orthogonal
fluxgates and 3 magnetometric channelsfluxgates and 3 magnetometric channels Fluxgates position: mastheadFluxgates position: masthead Measuring range: +/- 60.000 nTMeasuring range: +/- 60.000 nT Compensation range : +/- 50.000 nTCompensation range : +/- 50.000 nT Coils intensity current: +/- 5 ACoils intensity current: +/- 5 A Amplidyne power: 1-7 kVAAmplidyne power: 1-7 kVA Measuring error: 1%Measuring error: 1% Nonlinearity: < 1%Nonlinearity: < 1%
Degaussing coil: counteract the ship’s longitudinal permanent and induced magnetism- athwart ship coil - loops in vertical fore and aft planes for compensate the permanent and
induced magnetism- longitudinal coil - loops in vertical planes, counteract the ship’s longitudinal magnetism- quarterdeck coil- forecastle coil counteract the ship’s longitudinal magnetism- main coil made in a horizontal plane, encircles the ship and counteract the ship’s vertical
magnetism
MAGNETOMETRY - NAVAL & MARINE APPLICATIONSMAGNETOMETRY - NAVAL & MARINE APPLICATIONS
1313
Research regarding a omnidirectional Research regarding a omnidirectional magneto static transducer magneto static transducer
Magnetometric channel:• gradient channels: 3 orthogonal• magnetic field range: +/- 50.000 nT• sensibility on magnetic field: 0,1 mV / nT• sensibility on magnetic field gradient: 1 mV/ nT • magnetic field detection range: +/- 10.000 nT• gradient base: 2m • gradient magnetic field range: +/- 5.000 nT/m• duration of magnetic gradient pulse: 1s – 10s• astatic performance: 10-3
Destination: Naval mine with multiparametric sensors
MAGNETOMETRY - NAVAL & MARINE APPLICATIONSMAGNETOMETRY - NAVAL & MARINE APPLICATIONS
1414
Marine polygon: magnetic signature Marine polygon: magnetic signature
MAGNETOMETRY - NAVAL & MARINE APPLICATIONSMAGNETOMETRY - NAVAL & MARINE APPLICATIONS
Naval magnetometry polygon
Multichannel magnetometer
1515
Multichannel magnetometric installationMultichannel magnetometric installation
measuring rangemeasuring range: +/-20.000 n: +/-20.000 nT T +/-+/- 2.000 nT2.000 nT field compensationfield compensation: +/- 60.000 nT: +/- 60.000 nT error compensationerror compensation: 5 nT: 5 nT resolutionresolution: 1 nT: 1 nT measurement emeasurement errrorror: 2%: 2% channelchannel: 24: 24 fluxgate cable length: 200 mfluxgate cable length: 200 m calibrations testing calibrations testing galvanic separation between channelsgalvanic separation between channels analogic output:+/-5 V/50.000 nT/10 kanalogic output:+/-5 V/50.000 nT/10 kΩΩ temperature coefficient: 4 nT / °Ctemperature coefficient: 4 nT / °C
Magnetometer channel – hybrid integrated circuits
1616
Computerized sub aquatic magnetic polygonComputerized sub aquatic magnetic polygon
128 magnetometric128 magnetometric channelschannels
1717
Computerized sub aquatic magnetic polygonComputerized sub aquatic magnetic polygon
• 128 magnetometric channels • measuring range: +/- 80.000 nT• analogical output: 8V / 80.000nT• galvanic separation• length of the cable: 1.200 m
• magnetic field compensation: 16 step • magnetic field step: 5.000nT• A/D conversion: 16 bit• calibration step: 10.000 nT
1818
Computerized sub aquatic magnetic polygonComputerized sub aquatic magnetic polygon
Magnetometers arrangements
Magnetometer case
1919
Magnetic DMagnetic Detecţia de anomalii magnetice în mediuletecţia de anomalii magnetice în mediul marin marin – Marea Neagra - – Marea Neagra - produsul produsul ““SMM IIISMM III””
detecţia unor variaţii a câmpului magnetic mai mici de 1 nTdetecţia unor variaţii a câmpului magnetic mai mici de 1 nT acurateţe absolută a măsurării mai bună de 0,2 nTacurateţe absolută a măsurării mai bună de 0,2 nT să lucreze în condiţii de temperatură de la –să lucreze în condiţii de temperatură de la – 4040 C la +C la + 60 C60 C un număr de măsurări pe secundă mai mare de 3un număr de măsurări pe secundă mai mare de 3
Corp aerodinamic tractat
Magnetometru cu efect Overhauser
Unitate dispusă în aeronavă
Troliu electric pentru
lansarea şi
recuperarea
corpuluitractat
Unitatea de
calcul şi
afişare
Cablu specialde semnal şi
tracţiune(70m)
2121
Overhauser magnetometer Overhauser magnetometer CCaracteristici:aracteristici:
domeniudomeniu: 28: 28..000 – 75000 – 75..000 nT;000 nT; zgomot: 0zgomot: 0,,03 nT/Hz;03 nT/Hz; precizie: 0.5 nT;precizie: 0.5 nT; ieşire digitală cu rata de 10 Hz;ieşire digitală cu rata de 10 Hz; senzor omnidirecţional.senzor omnidirecţional.
Corpul tractat este realizat din Corpul tractat este realizat din materiale amagnetice compozite, fiind materiale amagnetice compozite, fiind acoperit cu materiale de amortizare a acoperit cu materiale de amortizare a şocurilor. Acesta este conectat cu şocurilor. Acesta este conectat cu cablul de tracţiune printr-o montură cablul de tracţiune printr-o montură specială.specială.
Corpul este tractat în mediu cu viteză Corpul este tractat în mediu cu viteză de până la 10 Nd la distanţa maximă de până la 10 Nd la distanţa maximă de 300 m. Adâncimea de lucru de 300 m. Adâncimea de lucru maximă este de 300 m. maximă este de 300 m.
Aceste echipamente sunt prevăzute Aceste echipamente sunt prevăzute cu mijloace de poziţionare de tip GPS cu mijloace de poziţionare de tip GPS de mare precizie pentru o localizare de mare precizie pentru o localizare corectă şi eficientă a obiectelor corectă şi eficientă a obiectelor căutate.căutate.
2222
O.Baltag, D. Costandache, Electromagnetic detection of the metallic O.Baltag, D. Costandache, Electromagnetic detection of the metallic hidden objects, International conference on “The detection of abandoned hidden objects, International conference on “The detection of abandoned lands mines”, Edinburg, 1996lands mines”, Edinburg, 1996
O. Baltag, D. Costandache, Detectia electromagnetica a corpurilor O. Baltag, D. Costandache, Detectia electromagnetica a corpurilor metalice, Conferinta Nationala de Fizica Aplicata, Iasi 2004metalice, Conferinta Nationala de Fizica Aplicata, Iasi 2004
Electromagnetic detection of metallic objects, Electromagnetic detection of metallic objects, O. Baltag,O. Baltag, D.Costandache, D.Costandache, Bul. Inst Pol. Iasi, tom LII (LVI), fasc. 1-2, 2006, pp.Bul. Inst Pol. Iasi, tom LII (LVI), fasc. 1-2, 2006, pp.
CERCETARI DE DETECTIE MAGNETICA CERCETARI DE DETECTIE MAGNETICA Cercetari privind dCercetari privind detectetectiaia subacvatic subacvaticaa a unora unor corpuri metalice corpuri metalice
aflate pe fundul mariiaflate pe fundul marii
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