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 Sistema de Imageamento por Condutividade Elétrica - StrataGem EH-4

 
 


O STRATAGEM resultou do esforço conjunto da Geometrics, Inc. e da Electromagnetic Instruments, Inc. (EMI), que haviam assinado um acordo para intercâmbio de informações sobre pesquisa, desenvolvimento e marketing.

O STRATAGEM fornece imagens de alta resolução do subsolo, em profundidades variando entre 10 e 500 metros, obtidas pela medição da condutividade elétrica.

A informação sobre a condutividade resulta de cálculo baseado em medidas dos campos elétricos e magnéticos de superfície, tomadas ao longo de uma série de perfis.

O STRATAGEM obtém a informação de profundidade de um determinado sítio pela medida de sinais de uma vasta gama de freqüências. A imagens das estruturas profundas (mais de 100 metros) são obtidas com o uso de campos-fonte que resultam da medição de sinais magnetotelúricos de fundo ou de fontes CSMAT convencionais. Para obter imagens de estruturas mais rasas é fornecido um transmissor portátil de baixa potência que suplementa os sinais de fundo obtidos no campo.
 

 
 

 

 

 

A configuração do STRATAGEM permite registrar dados de campos elétricos e magnéticos ortogonais que são processados para obter os valores do tensor impedância necessarios para interpretar estruturas complexas em duas dimensões.

As unidades de controle de dados, gravação e o monitor do STRATAGEM são plenamente compatíveis com o sistema multicanal StrataView da Geometrics.

Se o usuário desejar registrar os dados sísmicos multicanal e as imagens de condutividade elétrica em cada ponto do campo, é possível combinar os sistemas StrataView e STRATAGEM em uma única unidade compacta.

 

 
 


Features:

Fast Data Collection and Instrument Set Up: The operator can select the frequency bands and the number of time series stacks for data collection allowing optimization for data collection. Typical data collection times of 10 minutes per station and instrument set up time of 10 minutes per station.
One-dimensional and Two-dimensional Field Plots: Stratagem allows viewing of 1D soundings and 2D sections in the field.
Built-in Thermal Printer: Built in thermal printer can print hard copy of time series, signal amplitude, signal phase, coherency, apparent resistivity, resistivity curves, and depth and frequency sections.
Exploration as Shallow as 10 Meters and as Deep as 1 km: Actual depth of investigation will vary with the ground resistivity, signal quality, and whether low-frequency options are employed.
Complete Data Sets: Stratagem data file store complete time series, cross-power data, spectral amplitudes, scalar resistivity, tensor resistivity, phase, and coherency.
 

Configurations:

The Stratagem EH4 transmitter consists of a dual-loop antenna, transmitter electronics, and controller. The transmitter provides unpolarized source fields, which allow for true tensor measurements of ground resistivities. This provides more accurate interpretation of true resistivities than conventional single-dipole transmitter source signals. The transmitter is powered by a 12 V DC battery.

The illustration shows a typical configuration of the Stratagem receiver. The magnetic fields are detected with two perpendicular H-field sensors. The electric fields are detected by measuring the differential voltage between the two electrodes of the electric dipole. For example, the X-direction E field is measured between Ex0 and Ex1 as shown in the diagram. The response of the E-field sensors is amplified and filtered by the Analog Front End and transmitted to the Stratagem console for analog-to-digital conversion and digital signal processing..

The standard configuration provides for acquiring data in the range of 10 Hz to 92 kHz. The low-frequency configuration will allows the use of frequencies to as low as 0.1 Hz and thus greater depth of investigation.

The standard configuration uses a small, portable controlled-source antenna with a magnetic moment of approximately 400 A-m2. For work in highly resistive areas there is an optional large-loop antenna available of approximately 6,000 A-m2


Specifications:

Imaging System:

•Operating Principle: Natural and Controlled Source Tensor MT
•Frequency Range: 10 Hz to 92 kHz
•Transmitter: Model TxIM2 with Vertical Loop Antenna with Frequency Range of 1 kHz to 70 kHz. Antenna Moment of 400 Amp-m2 from Two Perpendicular Vertical Loop Antennae Each 4 m3. Operates on 12 V DC.
•Electrical Sensors: Four Model BE-26 Buffered Active High-Frequency Dipole 26-Meter Cable with Four SSE Stainless-Steel Electrodes
•Magnetic Sensors: Two Model BF-IM Magnetic Field Sensors (10 Hz to 100 kHz) with 10-Meter Cables
•Analog Front End: One Model AFE-EH4 Unit for Analog Signal Conditioning. Couples 2 Electric and 2 Magnetic Channels to the Data Acquisition Package.


Data Acquisition Package

•Channels: Four (2E, 2H)
•Hard Disk: 1.2 Gbyte or greater
•Analog-to-Digital: 18 bit
•Digital Signal Proces: 32-bits floating point with bandwidth of DC to 96 kHz
•Display: Liquid Crystal VGA
•Plotter: Built-in 4" (11 cm) wide plotter
•Power: 12 V DC, 40 Ah
•Operating: 0 C to +50 C in rugged portable/waterproof case
Options:
•Seismograph channels for integrated seismic measurements
Available with 12, 24, 36, or 48 channels.

•Magnetic Sensors:
Low-frequency 0.1 Hz to 1 kHz Sensors

 

Stratagem

Part 1: Receiver


Stratagem

Part 2: Transmitter


 

 

 

 

Prospectos: 

Stratagem EH-4 ( português )

Stratagem EH-4  ( inglês )

Informações Preliminares - tamanho: 844 KB

Deep Groundwater Exploration Using Geophysics - tamanho: 184 KB

Eh4 Mapping Structure China - tamanho: 154 KB

Eh4 Water basis USGS - tamanho: 1040 KB

Culpeper Basin, Virginia: Audio-magnetotelluric Data Processing

 Stratagem - EH4 - informations

Entire StrataGem EH Data Sheet ( .pdf, 1200 KBb)

StrataGem EH4 Presentation (.ppt, 11.8 Mb)

Case history

Work done by the US Geological Survey using the Stratagem for ground water exploration.

 

  

 

 

 

Principal | Produtos | Prospectos | Fale Conosco

      Copyright © 2007 Alpha Geofisica - Brasil 

 

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