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T-VLF System
 Features
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Lightweight system weighs less than 6kg.
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Sensor unit is back-mounted and has a hand held
controller unit.
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VLF radio wave receiver with frequency range 10 to
30kHz.
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Serial link for data transfer to microcomputer or
printer.
General
No orientation of the operator with the direction of the
transmitter is required. Three magnetic sensors measure the components of the VLF field.
The sensor unit has two inclinometers to correct for tilt.
The microprocessor automatically takes the measurement. The
frequency is keyboard selectable and two frequencies can be measured at the same time.
Low noise magnetic sensors and digital filtering produce good
measurements even in areas where primary fields are weak. A quality factor is given at
each measurement to control the quality of the data
Operation
The classical kilt angle mode, based on the measurement of
magnetic-only components, is used to prospect conductive dyke-like structures that
generally correspond to weathered or mineralized zones.
The resistivity mode is based on the measurement of magnetic
and electric components. When working with the resistivity mode, a short electric line and
two metaDic electrodes are used. Applications include the prospecting of resistive
dyke-like structures, and geological mapping (structural studies).
Display
A large graphic display gives the operator complete
information about the measurement: Tilt angle and ellipticity, with their Fraser
derivative values (mode 1); resistivity and phase (mode 2). The tilt or resistivity curve
is automatically plotted after each station to enable the operator to make a first
analysis of the measurements.
Internal Memory
All measured parameters, with frequency value, station and
line number, are stored in a solid state memory system capable of containing more than
four thousand measuring stations. At the end of the day, or on the field site, data can be
transferred to a printer or microcomputer.
Specifcations
VLF radio wave receiver with frequency range
10 to 30kHz.
Fully automatic measurement through
microprocessor control.
Frequency keyboard selectable in 100Hz
steps. Two frequencies can be measured at the same time.
Two measurement modes:
Large graphic display (240 x 64 points),
with display of:
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frequency, station and line numbers,
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Ellipticity and tilt angle (mode 1), or resistivity and phase
(mode 2),
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Quality factor for each measurement,
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Automatic curve plot for raw or Eraser derivative values.
Data storage in solid state memory.
Serial link for data transfer to
microcomputer or printer
Standard Components
Sensor console, logger, system software and instruction
manual.
Ordering Information
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Description
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Order Number
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| T-VLF System |
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500-190-0150 |
| Electric Field Sensor |
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500-190-0160 |
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