SkyTEM–a New High-resolution Helicopter Transient Electromagnetic System

2004 ◽  
Vol 35 (3) ◽  
pp. 194-202 ◽  
Author(s):  
K. I. Sorensen ◽  
Esben Auken
Keyword(s):  
High Resolution ◽  
Electromagnetic System ◽  
Transient Electromagnetic

High resolution 3D subsurface mapping using a towed transient electromagnetic system ‐ tTEM: case studies

2020 ◽  
Vol 18 (3) ◽  
pp. 249-259 ◽  
Author(s):  
Pradip Kumar Maurya ◽  
Anders Vest Christiansen ◽  
Jesper Pedersen ◽  
Esben Auken
Keyword(s):  
High Resolution ◽  
Case Studies ◽  
Electromagnetic System ◽  
Transient Electromagnetic ◽  
Subsurface Mapping

tTEM — A towed transient electromagnetic system for detailed 3D imaging of the top 70 m of the subsurface

Geophysics ◽  
2019 ◽  
Vol 84 (1) ◽  
pp. E13-E22 ◽  
Author(s):  
Esben Auken ◽  
Nikolaj Foged ◽  
Jakob Juul Larsen ◽  
Knud Valdemar Trøllund Lassen ◽  
Pradip Kumar Maurya ◽  
...  
Keyword(s):  
High Resolution ◽  
Raw Materials ◽  
Geophysical Methods ◽  
Central Valley ◽  
Aquifer Vulnerability ◽  
Late Time ◽  
Electromagnetic System ◽  
Aquifer Storage ◽  
Transient Electromagnetic ◽  
Subsurface Layers

There is a growing need for detailed investigation of the top 30–50 m of the subsurface, which is critical for infrastructure, water supply, aquifer storage and recovery, farming, waste deposits, and construction. Existing geophysical methods are capable of imaging this zone; however, they have limited efficiency when it comes to creating full 3D images with high resolution over dozens to hundreds of hectares. We have developed a new and highly efficient towed transient electromagnetic (tTEM) system, which is capable of imaging the subsurface up to depth of 70 m at a high resolution, horizontally and vertically. Towed by an all-terrain vehicle, the system uses a [Formula: see text] transmitter coil and has a [Formula: see text]-component receiver placed at 9 m offset from the transmitter. The tTEM uses dual transmitter moment (low and high moment) measurement sequence to obtain the early and late time gates corresponding to shallow and deep information about the subsurface layers. The first bias-free gate is as early as [Formula: see text] from beginning of the ramp ([Formula: see text] after end of ramp). Data are processed and inverted using methods directly adopted from airborne electromagnetics. The system has been successfully used in Denmark for various purposes, e.g., mapping raw materials, investigating contaminated sites, and assessing aquifer vulnerability. We have also used the tTEM system in the Central Valley of California (United States) for locating artificial recharge sites and in the Mississippi Delta region, to map complex subsurface geology in great detail for building hydrogeologic models.

Rapid Mapping of Hydrological Systems in Tanzania Using a Towed Transient Electromagnetic System

Ground Water ◽  
2021 ◽  
Author(s):  
Denys Grombacher ◽  
Pradip Kumar Maurya ◽  
Johan Christensen Lind ◽  
John Lane ◽  
Esben Auken
Keyword(s):  
Electromagnetic System ◽  
Rapid Mapping ◽  
Transient Electromagnetic

Drone-borne transient electromagnetic system and its application in UXO detection

2018 ◽  
Author(s):  
Zhi-peng Qi ◽  
Xiu Li ◽  
He Li ◽  
Ying-ying Zhang ◽  
Jianmei Zhou
Keyword(s):  
Electromagnetic System ◽  
Transient Electromagnetic

Reducing Motion-Induced Noise With Mechanically Resonant Coil Sensor in a Rigid Helicopter Transient Electromagnetic System

2020 ◽  
Vol 67 (3) ◽  
pp. 2391-2401
Author(s):  
Fei Liu ◽  
Jun Lin ◽  
Yanzhang Wang ◽  
Shilong Wang ◽  
Quan Xu ◽  
...  
Keyword(s):  
Electromagnetic System ◽  
Transient Electromagnetic
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