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GEOREF RECORD

The development and applications of the helicopter-borne transient electromagnetic system CAS-HTEM

Abstract

Over the past decade, helicopter-borne transient electromagnetic (HTEM) systems have been rapidly developed. A new HTEM prototype (referred to as a CAS-HTEM) has been developed by the Chinese Academy of Sciences. In terms of hardware, the CAS-HTEM system uses an inflatable structure to carry the transmitting loop, which significantly reduces the weight of the system and makes it easier to transport. A dual gain receiver was innovated to extend the dynamic range of the system. In addition, an observation circuit for transmitting voltage waveform is introduced, so that the derivative waveform of transmitting current with higher SNR could be calculated. In terms of data processing, more reliable early time data could be obtained by band-limited effect removal; a weighted stacking algorithm is introduced to reduce the narrow band noise more effectively and increase the sensitivity of data to the anomaly location; a method based on tau -domain transform is used for late time signal processing. The results of the field test which was carried out in Inner Mongolia were found to be consistent with the drill data, which effectively verified the performance of this HTEM prototype.


ISSN: 1083-1363
EISSN: 1943-2658
Serial Title: Journal of Environmental & Engineering Geophysics
Serial Volume: 24
Serial Issue: 4
Title: The development and applications of the helicopter-borne transient electromagnetic system CAS-HTEM
Title: Geophysics for urban underground space studies
Author(s): Wu XinFang GuangyouXue GuoqiangLiu LihuaLiu LeisongLi Jutao
Author(s): Liu, Lanboprefacer
Author(s): Qian Rongyiprefacer
Affiliation: Chinese Academy of Sciences, Institute of Geology and Geophysics, Key laboratory of Mineral Resources, Beijing, China
Affiliation: University of Connecticut, Department of Geosciences, Storrs, CT, United States
Pages: 653-663
Published: 201912
Text Language: English
Publisher: Environmental and Engineering Geophysical Society, Englewood, CO, United States
References: 36
Accession Number: 2020-006975
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N37°40'00" - N53°30'00", E98°00'00" - E126°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, copyright, Environmental & Engineering Geophysical Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202006
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