Products
EMFAD® - UG12 GPS 

Measurement Methods








Extension with GPS receiver


Previously, the measurement had to be made in a fixed grid in order to obtain a geographic assignment. In the new version, random measurement points now are possible, whose positions are stored as GPS coordinates. An additional GPS receiver is used.


Horizontal measuring method A-B:
The main application area for measurements is the horizontal method. With the comfortable posture of the device, large areas can be easily measured.
Both antennas can be controlled individually.
You can choose between automatic
and manual measuring point
you can decide.
In general, the automatic measuring point acquisition is used for
overview measurements in easily accessible terrain. The step speed and step distance selected once must be maintained for the entire area.
Vertical measuring method B-A:
This method is used for smaller areas and where high resolution is required for small target structures.

The measurement itself is done according to the requirements in a suitable grid on as straight as possible profiles. The profiles are either always unidirectional or meandering. With the meander-shaped measuring fixture, the running direction is changed by 180 degrees for every other profile.

If a detail measurement is made
or the terrain is difficult to walk,
should be a manual measuring point recording
be performed.
Single antenna for:
- Overview measurements
- to locate suspected areas
- Measurements in difficult terrain









XZ measuring method:


-The Hx/Hz measurement method is used in professional position and depth determination. 


Selectable scope of delivery

1. Basic Set


Hardware:

- Receiver UG12

- Tablet 12 Inch with 

   detachable keypad

- Mounting rod for one antenna

- Antenna No.1


- Carrier bag 1 for hardware  Basic Set


Software EMUNI package:

- Measurement software 

 „Profile- ESD“

- Frequency Search with

 „Spectrum“

- Evaluationsoftware „2D/3D“

- „Setup“, 

- „Connect“


2. Enhancements


Hardware for Measurements A-B, B-A and XZ-Depth determination 

 

 - Mounting rod for two Antennas

  - Antenna No. 2


  - Carrier bag 2 for hardware

    Enhancements and Transmitter



Software packages:


- Measurement software 

    „Profile- EXZ“ (depth

     determination)

    - Tools, Calibration 

     software


GPS Measurement Software and Hardware   

    - Scan GPS

    - Path

    - Map

    - Assign


Evaluation software for depth determination

   - „HzEMSoft“ from  EMTOMO LDA

This software is already installed with the EMUNI package. However, the unlock code must be requested from EMTOMO LDA. 


3. Transmitter


- TRX 2 with 6 frequencies

 19, 24, 33, 70, 90, 124 kHz


          the frequencies can be

          changed on request


- TRX 2 cable antenna

- Fits in carrier bag 2








Carrier Bag for the Basic Set







Carrier Bag for the Enhancements and Transmitter

EMFAD - TRX2 Transmitter


If the reception of existing (external) longwave transmitters is poor, the own transmitter (TRX2) is used. It can also be used to perform measurements with frequencies for which no long-wave transmitters exist or do not provide sufficient field strength.

Front panel:

On the front panel are the controls for frequency change, output power in percent, on/off switch and a display showing the respective status.

In measurement areas where no or only weakly incident transmitters can be determined, the dedicated TRX2 transmitter/generator is used. Six frequencies (19, 24, 33, 70, 90 and 124 kHz) can be generated with the transmitter. The transmitting frequency is coupled via a 40m wire antenna, which is laid out as round as possible on the ground.




Rear panel:

At the rear are the outputs for the wire antenna, the charging socket for the lead/gel battery and a microfuse.

EMFAD®- EMUNI:
Recording and evaluation software


Spectrum (frequency analysis):
In the subprogram "spec" All receivable locally Frequencies are shown in a dynamic display in percent as well as in a waterfall display as a different bright bar.
The tool can be used locally to determine the frequencies that can be received there and to overwrite up to seven previously stored frequencies with "change and save frequency",
Set up:
In the subroutine "setup" all necessary settings for a survey are made.

GPS - measurement


EMFAD-UG12 GPS builds on the proven EMFAD-UG12 and facilitates the measurement of large areas in particular due to its GPS receiver. With the GPS coordinates, the measurement no longer needs to be carried out in a fixed grid, but can be carried out at random points. In addition, measurement paths can be subsequently displayed on maps.

During the running measurement with "scanGPS" the following data are displayed for each measuring point:


- GPS, LAT, LON

- Available and used transmitter

- Position of the measuring points and signal strength




In the display "path" various evaluations can be made, e.g:

- in "set point" the position of the anomalies in

  meters from the start point of the measurement in X/Y direction

  or

  distance in meters and  degree number

- in "mode select" all stored frequencies can bedisplayed



With "map" the GPS measurement can be transferred to a map

Profile raster measurement




The picture shows a measurement performed with "profile ESD" with all additionally displayed settings from the "Setup".


Picture shows the beginning of a profile EXZ measurement, which is used as a basis for a depth determination. For this measurement, the horizontal alignment of the X antenna must always point to the transmitter. As soon as this is the case, a green point appears in the compass rose. The measurement point is then saved with Step.

Scan 2D/3D:
Data evaluation:
The data recorded with a frequency in "profile ESD" or "Profile EXZ" are displayed on a TABLET-PC in real time.
The measurement frequency used, as well as 6 further preselected frequencies, are automatically saved and can be further processed and evaluated with the evaluation software "scan 2D/3D on site with the TABLET-PC or later on a notebook or PC.

The possibility to compare all 7 frequencies stored as raw data in scan2D/3D in the evaluation is unique in geophysics and leads to a considerable time saving in the evaluation.

"scan2D/3D" allows interpretation of data in 2D and 3D view, modeling, documenting and printing. After processing, the data can be exported to programs that can process ASCII files, such as Golden Software's "SURFER".
3D view:
The example in the main window shows anomalies with high conductivity. The color assignment as well as options for setting the graphic view as well as the language can be freely selected,
With a double click in the graph you can get detailed information for each measured profile in the upper window "single profile".
2D-view:
The Main window shows the same anomalies. In the 2D view detailed information, such as X / Y coordinates,  relative conductivity and the approximate depth of the anomaly can be determined.
Raw data, numeric:
For each measurement, the minimum and maximum values ​​are automatically displayed above the EMFAD®-logo. The numeric display allows quick localization of minimum and maximum values ​​in each individual profile and thus the classification of positive or negative anomalies.

Position and depth determination




The program HzEMSoft from EMTOMO LDL is part of the software package EMFAD-EMUNI and is used for professional depth determination.



The picture shows the measurement result of a profile EXZ measurement above a gas tube. Wherever the Hz-component of the electromagnetic field has a minimum, the Hx-component shows a maximum. This can be seen very well in this measurement example. The profile EXZ measurement is the data basis for a depth and position determination with HzEMSoft.

Figure shows the result of a depth and position determination of the pipe (distance Xo = 5.8m from the starting point of the measurement and the depth = 2.0m).

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