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welcome to the national access programme
a programme of the Tyndall National Institute with funding from SFI |
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New
facilities available:
Magnetics
Sensor Characterisation Laboratory
This
page is also available in printer friendly format (pdf)
- click here
Introduction
This new facility contains instrumentation for
characterisation of magnetic field sensors, magnetometers and
electronic compasses. Detailed characterisation with triaxial
Helmholtz coils includes measurement of sensor response to
defined DC magnetic field in all three principal axes. The
data acquired provide information about sensor sensitivity,
linearity, applicable field range, hysteresis, resistance to
shock fields. The characterisation with magnetic shielding may
provide data on sensor noise and stability (ultra-low
frequency noise). The equipment is ready to test fluxgate
sensors, anisotropic magnetoresitors (AMRs), Giant
magnetoresistance sensors (GMRs), Spin-dependent tunnelling
sensors (SDT), magnetoimpedance sensor (MI), Giant
magnetoimpedance sensors (GMI) and Hall effect sensors.
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Triaxial
Helmholtz Coils
- Circular
coils for generation of homogeneous magnetic field
inside the coil volume
- Generate defined
field magnitude in three principal axes and
subsequently measure the sensor response
- Vendor
–
Tomek
,
Czech Republic
; Model – Custom model
- Features
- Coil diameter 48, 54 and
60 cm
- Maximum device dimensions:
sphere diameter 245 mm or block 247x218x276mm
- Coil constant 0.307 mT/A,
alternatively 0.062 mT/A
- Minimum field step 600 nT
(all three axes)
- Maximum generated field 3
mT (all three axes)
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Positioning
rotating device support available
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Magnetic
Shielding
- Cylindrical
multilayer magnetic zero-field chamber for
measurement of sensor noise and stability
(ultra-low frequency noise)
- Eliminates
DC an low-frequency magnetic fields
- geomagnetic
field inside the chamber
- stray
fields from instrumentation (50 Hz)
- Output
of sensor corresponds to its own noise, not
influenced by surrounding magnetic disturbances
- Vendor
– Magnetic Shield Corporation,
USA
; Model – Customized ZG-206
- Features
- 4
layers of Co-Netic AA high permeability material
(standard ZG-206 is 3-layers)
- Shielding
factor transversal > 125 dB, longitudinal >
100 dB
- Remanent
field transversal < 25 nT, longitudinal <
100 nT
- Wire/connector
hole diameter
22
mm
- Chamber
diameter 152 mm. length 381 mm
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Instruments
available
- PC
with National Instruments LabView Professional
- NI
GPIB-USB-HS
- 3x
Agilent E3633A DC power supply 20V/10A
- 3
way current commutator
- 3x
Agilent 34410A multimeter (AC/DC current, AC/DC
voltage, resistance, temperature,…)
- Stanford
Research Systems SR844 lock-in amplifier (25 kHz-200
MHz)
- Signal
Recovery SR7265 lock-in amplifier (1 mHz-250 kHz)
- Amplifier/power
supply Kepco BOP50-8D
- HP3561A
FFT spectrum analyzer
(DC to 100 kHz)
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Signal
generator, digital oscilloscope…
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Measurement
system software “SensorTest 2.1”
- Tyndall
proprietary SW developed in LabVIEW
- Measurement
system to accommodate various types of measurement
sequences
- Controls
measurement instruments via GPIB bus
- Up
to 3 power supplies and associated commutator
- Up
to 3 lock-in amplifiers
- Up
to 6 multimeters
- Bus
trigger synchronised measurement
- Configurable
data display, multimeter measurement mode
- Report
generation, Excel data output
- Timer-based
measurements
- Capabilities
- DC
characteristic measurement
- Perming
measurement
- Cross
field sensitivity measurement
- Offset stability
measurement
- Sensitivity
stability measurement
- Datalogger
- Temperature
monitoring available
Custom
measurement/monitoring system development (PC,
PDA-based) available
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For
further details contact:
Dr.
Jan Kubik
, T: +353 (0)21 490 4003 Email: jan.kubik@tyndall.ie
Dr.
Jan Vcelak, T: +353 (0)21 490 4298 Email: jan.vcelak@tyndall.ie
Ref:
www.tyndall.ie/nap/mscl.html
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Programme Coordinator: Paul Roseingrave | Telephone:
+353 (0)21 490 4268 | Email: nap@tyndall.ie
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