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   OhmMapper - Resistivímetro Acoplado por Capacitância

    


Medição rápida de resistividade, sem sondas.

O novo OhmMapper da Geometrics é um resistivímetro acoplado por capacitância que mede as propriedades elétricas das rochas e do solo sem usar as incômodas sondas que são exigidas nos levantamentos tradicionais de resistividade.

Um conjunto simples de cabos coaxiais com seções transmissora e receptora é arrastado sobre o solo por uma pessoa ou por um veículo com tração nas 4 rodas. A aquisição de dados é muito mais rápida do que a oferecida por sistemas que usam o método convencional de medição de resistividade por CC. 

Características:

  • É possível obter um perfil pleno da resistividade de dipolo a dipolo numa fração do tempo tomado pela medida tradicional de resistividade.

  • O equipamento opera sobre solo congelado, gelo, concreto e outras superfícies que dificultam as medidas com dipolo aterrado.

  • Os dados são registrados com o uso do console DataMapper da Geometrics que facilita o acompanhamento do levantamento e o posicionamento dos dados de resistividade.

  • O processamento posterior dos dados é facilitado pelo uso do software DataMap da Geometrics que permite a edição e posicionamento dos dados, alem de criar saídas de dados em formato compatível com os programas de processamento e mapeamento dos clientes.  

Configurações:

Este diagrama mostra a configuração física do OhmMapper TR1. O transmissor fica na ponta do conjunto de sensores. O transmissor inclui a parte eletrônica de transmissão, com suas baterias, além de dois cabos transmissores dipolo.

O transmissor é rebocado através de uma conexão neutra que o une ao receptor. O receptor inclui uma parte eletrônica de transmissão, com suas baterias, além dos cabos dipolo. Os níveis de voltagem que são recebidos são convertidos em sinais digitais, no receptor, e transmitidos para o gravador que é portado pelo operador. O operador porta o console de registro de dados (DataMapper) na sua cintura


Specifications:

Operating principle: Constant-current capacitively-coupled, dipole-dipole resistivity

Operating range: Less than 1 OhmMeters to greater than 100,000 OhmMeters

Cycle Rate: Signal sample and data logging rate at 2 times per second

Data Storage: 2 Mbytes of nonvolatile RAM

Audio Output: Metronome, signal amplitude, disconnect

Visual Output: 320 by 200 graphic LCD display, daylight visible with selectable outputs for:

Data Display: 5 line profiles of resistivity

Internal Clock: Resolution of 0.1 drift <1 second/day.

Weight: Console: 1.6 kg

Transmitter: 2 kg

Receiver: 2 kg

Battery pack/Harness: 1.6 kg

Array Depressor Weight: 3 kg (estimate)

Transmitter specifications:

  • Frequency under 18 kHz

  • Output current: variable from 16 mA to 0.25 mA

    Receiver Specifications:

  • Dipole lengths: 5 m, 10 m, 15 m, 20 m, longer lengths optional

  • Input Specifications: 5 Mhos

  • Measured Voltage Accuracy: 1%

  • Input Voltage Range 0-2 V RMS

  • Power Line Rejections: >100 dB

    Spacing:

  • Variable Spacing.

    Dimensions:

  • Console: 15 × 8 x 28 cm

  • Battery: 8 × 14 × 20 cm

    Battery:

  • Transmitter receiver: 12 V DC

  • Console: 28 V DC

  • Internal battery backup for clock and nonvolatile RAM

    Survey Types:

  • Continuous, constant-offset dipole-dipole resistivity. (Multi-line with constant transmitter-receiver spacing for plan-view mapping.)

  • Variable-offset, dipole-dipole resistivity. (Variable transmitter-receiver spacing for multiple passes on a single profile line to create a pseudosection.)
     

 


OhmMapper Part 1 (Field Set-Up)


OhmMapper Part 2 (Field Set-Up)



OhmMapper Part 1 (Data Analysis)



 


OhmMapper Part 2 (Data Analysis)


OhmMapper Part 3 (Data Analysis)


OhmMapper Part 4 (Data Analysis)

 

 
Prospecto OhmMapper  ( português )

Prospecto OhmMapper ( inglês) 

View OhmMapper PDF Slide Show  em PDF ( tamanho 3.2Mb )

View OhmMapper PPT Slide Show   em PPT ( tamanho 7.9 Mb ).
 

 

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