LEMI-423 Magnetotelluric Data Acquisition System

• Type Name: Magnetic Field/Electric Field Instruments
  Type Identifier: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/bb175474-5e70-47be-8e1f-8dcd7563cc5b
  Type Identifier Type: URL
• Type Name: Magnetotelluric data acquisition system
  Type Identifier: https://pidinst.data.auscope.org.au/taxonomies/term/a2fb0e94-3bd0-4c51-b1f1-b2fcf58d8d37
  Type Identifier Type: URL

• Owner: Adelaide University
  Owner Contact: graham.heinson@adelaide.edu.au

• Manufacturer: Laboratory of Electromagnetic Innovations (LEMI)

• Model Name: LEMI-423
  Model Identifier: https://lemisensors.com/?p=485
  Model Identifier Type: URL

• Date: 2019-05
  Date Type: Commissioned

• Variable Name: MAGNETIC FIELD
  Variable Identifier: https://gcmd.earthdata.nasa.gov/kms/concept/204b482b-449b-42c9-a5bb-f6da42bee3a4
  Variable Identifier Type: URL
• Variable Name: ELECTRICAL FIELD
  Variable Identifier: https://gcmd.earthdata.nasa.gov/kms/concept/3202dab6-144a-4bfb-9bda-9d07e5ee7ec2
  Variable Identifier Type: URL

• Magnetotelluric
• MT
• Broadband MT

The LEMI-423 is a portable broadband magnetotelluric (MT) data acquisition system designed to measure naturally occurring electromagnetic field variations for passive electromagnetic sounding. The instrument simultaneously records three orthogonal magnetic field components using induction coil sensors and two orthogonal electric field components, enabling broadband magnetotelluric observations across a wide frequency range. The LEMI-423 incorporates low-noise analogue signal conditioning, high-resolution analogue-to-digital conversion, and GPS time synchronisation to support accurate, time-aligned acquisition of electromagnetic field data. It is commonly deployed in crustal and lithospheric imaging, mineral and geothermal exploration, groundwater investigations, and tectonic studies. This instrument instance forms part of the AuScope - ANSIR: Research Facilities For Earth Sounding and has been deployed in multiple research surveys across Australia.

• Funder: AuScope

• Alternate Identifier Type: Serial Number
  Alternate Identifier: #0036