ABEM WalkTEM Transient Electromagnetic

ABEM WalkTEM transient electromagnetic system (TEM) provides an intuitive user interface combined with stunning performance, making it a powerful tool for surveys in the geological near-surface. Applications include groundwater and mineral exploration and environmental investigations. Now with a new booster option for even deeper soundings.

The Transient Electromagnetic (TEM) method
The transient electromagnetic method offers good penetration of conductive overburden and is increasingly popular for hydrogeological purposes as well as general geological mapping and mineral exploration. Since there is no requirement for galvanic ground contact, data can be collected in high resistivity surficial zones and in areas covered by ice or exposed rock.

Advanced TEM made easy
ABEM WalkTEM is derived from the airborne SkyTEM helicopter system, sharing the technology. While SkyTEM covers large areas, ABEM WalkTEM offers a more accurate resolution of fine details in geology with the transient electromagnetic method. With a set of predesigned protocols, ABEM WalkTEM quickly switches between different tasks. A variety of transmitter loop sizes provides good scalability for the project at hand.

Data collection is complete in a few minutes
With its unique acquisition technology, ABEM WalkTEM accurately resolves a wider span of signals, covering both deep and more near-surface data in one go, greatly improving field survey efficiency. A high level of integration means less carrying and setup. Powerful onboard processing software takes the guessing out of field surveys as a resistivity layer model can be produced within a minute after a transient electromagnetic measurement has been conducted.

New booster option for even deeper soundings
The new ABEM TX-60 is an optional external booster that further widens the ABEM WalkTEM’s application area. With up to 60 A output current it enables even deeper transient electromagnetic soundings with larger transmitter loops.

 

 

Transient Electromagnetic measurement out in the field with WalkTEM

AdvantageS
  • Easy to handle standalone transient electromagnetic system
  • Fast setup, field effective operation and processing directly on site
  • Dual moment transient electromagnetic measuring technique enables high-resolution data from both large and shallow depths
  • Intuitive graphical user interface, easy to switch between pre-installed protocols, integrated easy-to-use processing software
  • Dual channel input utilizes dual antennas working simultaneously
  • High level of integration – a rapid turn-off transmitter, dual channel receiver and computer in one rugged and portable platform
TYPICAL ApplicationS
  • Groundwater prospecting
  • Geological mapping
  • Salinity studies
  • Mineral exploration
Resources

Product Brochure

Technical Specifications

User Manual

TX-60 New booster option

ABEM TX-60 is an optional external booster that further widens the ABEM WalkTEM’s application area, enabling even deeper transient electromagnetic soundings with larger transmitter loops. Like the ABEM WalkTEM transient electromagnetic instrument, the ABEM TX-60 is designed for demanding field work under rough field conditions, housed in a rugged aluminum case that meets IEC IP 66.

The ABEM TX-60 booster interacts with the ABEM WalkTEM transient electromagnetic system via a communication cable and the units are totally isolated from each other. Control power is supplied from an internal rechargeable battery and transmitter power is supplied from an external DC power source.

The ABEM TX-60 outputs a massive 60 Amperes, handles up to 250 V DC input voltage and is synchronized with the ABEM WalkTEM system during transmission.

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System configuration
The ABEM WalkTEM transient electromagnetic system integrates a high current transmitter and a dual channel wide bandwidth receiver in one rugged box, which also contains an integrated PC and dual internal batteries. The transient electromagnetic system is complete with two models of low noise receiver coils; one optimized for high-resolution shallow soundings and the other with a larger effective area, suitable for deeper soundings.

Dual moment measuring technique
Using dual moment transmission the ABEM WalkTEM automatically alternates between the maximum and reduced transient electromagnetic current pulses, thus utilizing the benefits from both high energy fields as well as fast current pulse turn-off. The advantage is a high-resolution response from shallow to maximum depth. With its unique acquisition technology, ABEM WalkTEM accurately resolves a wider span of signals, covering both deep and more near-surface data in one go, greatly improving field survey efficiency.

Processing and visualization
Data processing into a layer model can be done directly on site, using the onboard ViewTEM software. Further processing and visualization can be done with ViewTEM PC version and Aarhus Workbench.

­­Connectivity
A wide range of connectivity, such as GPS, Ethernet, and USB, is available, making it possible to take transient electromagnetic measurements without being close to the instrument, and for our support team to conduct upgrades, support and troubleshooting remotely.

Features

  • Built-in Windows computer and integrated GPS
  • Sunlight visible LCD with a graphical user interface
  • A variety of transmitter loop sizes are available
  • Onboard data processing software
  • ViewTEM processing software is offered as a powerful option for further data editing and processing in the office
  • Fully compatible with Aarhus Workbench for further visualization

 

Technical Specifications

GENERAL

  • Casing: Rugged Aluminum case meets IEC IP66
  • GPS receiver: 50 channels SirFstarIII chip
  • Display: 8,4” Active TFT LCD, full color, daylight visible, with 6 mm shatterproof glass, resolution of 800×600
  • I / O ports: 2x KPT-19 for receiver coils
  • Power: 2x 12 V, 8 Ah internal NiMH power pack, 10-34 VDC external power
  • Battery chargers: Integrated for internal batteries
  • Dimensions(WxLxH): 390x210x320 mm
  • Weight: 14 kg
  • Ambient Temperature Range: -20 °C to +60 °C operating, -30 °C to +70 °C storage

INTEGRATED FIELD PC

  • Processor: Low power Intel Atom,1,6 GHz
  • Operating System: Windows XP Pro
  • Internal RAM: 2 GB (DDR SO-DIMM module)
  • Hard disk capacity: Solid state disk of 100 GB or greater
  • I / O port: 2x USB 2.0 ports
  • Network interfaces: 1x IEEE 802.3, TP-10/100/1000, RJ-45 IP67
  • WiFi interface: Integrated with built-in antenna

TRANSMITTER

  • Output current: 15 A
  • On/Off Time: Adjustable from 1 ms to 500 ms in microsecond steps

RECEIVER

  • Receiver input: 2 Channels
  • Sampling: 1 MHz each channel
  • Dynamic range: 170 dB system 140 dB instantaneously
  • Repetition rate: From 500 Hz to 0.5 Hz in microsecond steps
  • Stacking options: 1 to 65,536 in single steps
  • Windows (Gates): Up to 200 depending on time series selected in 3 sets (optional, user selectable)
  • Functions measured: Transient response, current battery voltage (external an internal), automatic gain/offset calibration, layer model (full data inversion)

FIELD ACCESSORIES

RC-5 Active magnetic receiver coil (frame)

  • Effective area: 5 m2 (20 turns)
  • Bandwidth: 450 kHz
  • Dimensions (W x L x H): 590x590x90 mm

RC-200 Active Flexible magnetic receiver coil (cord)

  • Effective area: 200 m2 (2 turns)
  • Bandwidth: 100 kHz
  • Dimensions: 10×10 meters

TL-400

  • Effective area: 400 m2
  • Dimensions: 20×20 meters

TL-1k6 Flexible transmitter coil (cord)

  • Effective area: 1,600 m2
  • Dimensions: 40×40 meters
  • Conductor cross-sectional area: 2.5 square mm

TL-10k Flexible transmitter coil (cord)

  • Effective area: 10,000 m2
  • Dimensions: 100×100 meters
  • Conductor cross-sectional area: 4 square mm

L-40k Flexible transmitter coil (cord)

  • Effective area: 40,000 m2
  • Dimension: 200×200 meters
  • Conductor cross-sectional area: 4 square mm

Case Stories

Monitoring fresh/saline interface

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