Home Products Rentals Services Case Histories Contact  
Airborne Surveying Systems
Borehole Logging Systems
Earthquake Detection & Vibration Monitoring
Electromagnetic Systems
Environmental, Engineering & Archaeology
Ground Penetrating Radar
Induced Polarization Systems
Magnetic Susceptibility Meters
Magnetometers
Marine Systems
Physical Properties
Proton Magnetic Resonance
Radiation Detection
Resistivity Meters
Seismic Equipment
Software
UXO Detection
XRF

TEM 47 Shallow TEM Transmitter
  BACK



Features
  • Applications include mineral exploration, structural mapping, resistivity sounding, and contaminant plume mapping.
  • Very fast sum-off time enables near surface response measurements.
  • Good response and resolution to depths down to 150m.
  • Optimal for Slingram (horizontal loop) surveys for mineral exploration to shallow depths, and for groundwater exploration in bedrock fractures.
  • High-frequency receiver coil has the bandwidth necessary to capture the earliest portion of the transient decay.


General

Three interchangeable transmitters -TEM 47, TEM 57 and TEM 37—are used with the Protem receiver and the appropriate receiver coil to make up different Protem systems for various applications such as mineral exploration, structural mapping, resistivity sounding, and contaminant plume mapping.

The TEM 47 is the smallest, lightest battery operated transmitter of the three models and has a very fast turn-off time to enable the near surface response to be measured. The Protem 47 (protein receiver and TEM 47 transmitter) is most often used for shallow geoelectric sounding looking for conductive contaminant plumes, saline intrusion or general stratigraphy mapping. In this mode, single turn transmitter loops from 5m up to 100m on a side, with turn-off times as short as half a microsecond, can be used to give maximum near surface resolution.

The maximum transmitter output of 3 A into a lOOm x 100m loop gives a good response and resolution to depths down to 150m. This ability makes the TEM 47 the ideal instrument for resistivity sounding over a large area.

The TEM 47 uses a reference cable to achieve the high synchronization accuracy required for shallow sounding. Regardless of application, the high-frequency receiver coil is used in Protem 47 systems. This receiver coil has the bandwidth necessary to capture the earliest portion of the transient decay.

When the TEM 47 is used in a Protem 47 system for profiling, it supplies 3 A to an 8-turn, 5 x 5m moving transmitter loop to provide a dipole moment of 600 ampere square meters. With base frequency of 75Hz and 20 gates from 49ps to 2.9ms, this configuration is optimal for Slingram (horizontal loop) surveys for mineral exploration to shallow depths, and for groundwater exploration in bedrock fractures. Electrical sounding is performed simultaneously with the search for fault or dike-like targets.

Specifications
  • Current Waveform: Bipolar rectangular current with 50% duty cycle
  • Frequency: 30, 75 or 285Hz where powerline frequency is 60Hz. 25, 62.5 or 262.5Hz where powerline frequency is 50Hz
  • Turn-Off Time: 2.5 ps at 2 A into 40 x 40m loop. Faster into smaller loop
  • Transmitter Loop: 5 x 5 to 100 x lOOm single turn loop, or 5 x 5m 8-turn loop
  • Output Voltage: 0 to 9V, contnuously variable
  • Power Supply: Internal 12V rechargeable battery
  • Battery Life: 5 furs. continuous operation at 2 A output
  • Dimensions: 10.5 x 24 x 32cm
  • Weight: 6.3kg
Standard Components
Transmitter, shipping case and instruction manual