Notre partenaire Lake Shore Cryotronics

Capteurs à effet Hall (magnétique)

Lake Shore Cryotronics

Les capteurs à effet Hall mesurent ou détectent électroniquement les champs magnétiques. Ils fournissent une tension de sortie proportionnelle à la densité du flux magnétique. Ce dispositif repose sur l'effet Hall. L'effet Hall est le développement d'une tension à travers une feuille de conducteur lorsque le courant circule, et que le conducteur est placé dans un champ magnétique. Nous proposons une gamme de capteurs à effet Hall pour diverses applications. Dans tous les cas, ces capteurs vont au-delà de la simple détection de présence magnétique, comme ceux utilisés dans les codeurs, les interrupteurs sans contact et les boussoles électroniques. Les capteurs Lake Shore sont utiles pour les applications de mesure de champ, où la valeur, la direction et la polarité du champ sont intéressantes.

Caractéristiques
  • Configurations à un ou trois axes
  • Large gamme de températures de fonctionnement
  • Une version plug-and-play est disponible pour les teslamètres et les gaussmètres

Plus d'informations

A Hall sensor is a 4-lead device. The control current (IC) leads are normally attached to a current source such as the Lake Shore Model 121. The Model 121 provides several fixed current values compatible with various Hall sensors.

The Hall voltage leads may be connected directly to a readout instrument, such as a high impedance voltmeter, or can be attached to electronic circuitry for amplification or conditioning. Device signal levels will be in the range of microvolts to hundreds of millivolts.

The Hall sensor input is not isolated from its output. In fact, impedance levels on the order of the input resistance are all that generally exist between the two ports. To prevent erroneous current paths, which can cause large error voltages, the current supply must be isolated from the output display or the downstream electronics.

 

2Dex

InAs—stable

InAs—sensitive

GaAs

What makes this work?
Words to impress your boss

Thin-film technology using a 2‑dimensional electron gas (2DEG) structure

Indium arsenide bulk material, doped for high stability

Indium arsenide bulk material, doped for high sensitivity

Gallium arsenide thin film

Temperature range
An advantage of non-silicon-based Hall sensors is the opportunity for use in more extreme temperatures

1 K to 402 K
(-272 °C to 125 °C)

1.5 K to 375 K
(-271.5 °C to 102 °C)

208 K to 373 K
(-65 °C to 100 °C)

233 K to 402 K
(-40 °C to 125 °C)

Interchangeability
Ability to operate multiple sensors with identical drive and measurement setups

Good—narrow range of sensitivity values, excellent linearity, and small offset voltage

Poor—sensitivity range is large enough to require knowledge of the average sensitivity value

Poor—sensitivity range is large enough to require knowledge of the average sensitivity value

Poor—sensitivity range is large enough to require knowledge of the average sensitivity value

Ruggedness
Ability to survive shock and vibration

Good

Poor

Poor

Good

Lake Shore instrument compatibility
Gaussmeter/teslameter compatibility for these sensors, allowing for field values to automatically be displayed by the instrument

F71 or F41 teslameter with plug-and-play sensors—full sensor calibration and temperature compensation providing accuracy equivalent to a full teslameter probe

425 or 475 gaussmeter using HMCBL cable; field conversion accomplished with single sensitivity value only, meaning linearity and temperature compensation is not carried out by the gaussmeter

425 or 475 gaussmeter using HMCBL cable; field conversion accomplished with single sensitivity value only, meaning linearity and temperature compensation is not carried out by the gaussmeter

None

Planar Hall effect
Physical property related to Hall element thickness that introduces measurement error when the field is in-plane with the sensor element

None, making these sensors ideal for measuring fields with unknown orientation

Significant—bulk material produces enough of a planar Hall effect that fields with known directions are required for accurate measurements

Significant—bulk material produces enough of a planar Hall effect that fields with known directions are required for accurate measurements

Some—thin film elements may exhibit small amounts of planar Hall effect error

Sensitivity at nominal current
Impacts measurement accuracy and resolution—a higher number is better

50.5 to 52.5 mV/T

5.5 to 11 mV/T

55 to 125 mV/T

110 to 280 mV/T

Sensitivity temperature coefficient
Impacts accuracy during large temperature shifts

200 ppm/°C

50 ppm/°C

800 ppm/°C

600 ppm/°C

Nominal drive current
The recommended excitation level for these sensors

1 mA

100 mA

100 mA

1 mA

Typical input resistance
Useful when selecting the drive circuit

800 Ω

2 Ω

2 Ω

750 Ω

Typical input resistance temperature coefficient
An additional source of measurement error if using a voltage source (rather than current source) to power the sensor

0.7%/°C

0.15%/°C

0.18%/°C

0.2%/°C

Best offset voltage (field equivalent)
An error component that has a bigger impact at small fields

±25 µV (0.5 mT)

±50 µV (4.5 mT)

±75 µV (0.6 mT)

±2.8 mV (10 mT)

Specification

2Dex™ Hall Sensors

  • Multiple package types
  • Small active areas
  • Single or 3-axis configurations
  • Suitable for extreme environments (temperature, radiation, vacuum)
  • Plug-and-play version available for direct connection to Lake Shore F71/F41 teslameters

2Dex™ Plug-and-Play Hall Sensors

  • Multiple package types
  • Small active areas
  • Single or 3-axis configurations
  • Plug-and-play sensors
  • Inline connector
  • Easy extension

InAs and GaAs Hall Sensors

  • Multiple packages available
  • Options for high stability or sensitivity
  • Compatible with Lake Shore 400 Series gaussmeters

Téléchargements

2Dex Hall sensors
Magnetic field sensors Hall generators

Contact

Elodie Ponsard
Elodie Ponsard

Contact

Quantum Design S.A.R.L.

1 avenue de l’Atlantique
Bâtiment Mac Kinley
91940 Les Ulis
France

Tél. :01 69 19 49 49
Fax :01 69 19 49 30
Email :france@qd-europe.com
Elodie PonsardIngénieur Technico-Commercial
01 69 19 49 49
ponsard@qd-europe.com