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LMX-200 Utility Location GPR

LMX-200 ready for testing with GPS installedIntroduction

The Sensors and Software LMX-200 is the latest in their longstanding utility location range. On site it can quickly take depth slices and wirelessly export site reports with geo-located data. Offsite review with Ekko-Project combined with Utility Suite can overlay data with Global Positioning locations with site photographs, CAD or even google maps. Like all Sensors and Software GPR systems the LMX 200 is extremely rugged and easy to use. The controls are touchscreen and extremely intuitive. The lightweight trolley is really ergonomic, easy to pack and very easy to manuveur.

Applications

  • Location and mark pipes, services and utility as well as other buried objects (tanks etc)
  • Create expert maps and reports using images and locations recorded from scans
  • Also useful for Geology, Archaeology and Civil applications

Features

  • High visibility, touch screen display
  • Display depth slices from collected grids, right in the field
  • UWB Antenna producing highest data quality
  • Dynamic Target Enhancement (DynaT), allows user to selectively view small, medium or large subsurface targets
  • Lightweight fibreglass cart frame
  • Built-in WiFi capability
  • Integrated GPS receiver with optional external GPS for increased positional accuracy for geo-referencing data
  • Ability to mark surface flags and subsurface interpretations
  • Display your travelled path and targets in Map View
  • Seamless export of data to EKKO_Project software for further data analysis

Benefits

  • Easy integration with internal GPS or high precision external GPS
  • On site reports, including line, grid or map views can be viewed or emailed with WiFi hotspots
  • Target enhancement priortises views of small or large utlity targets
  • External GPS activates Map view, targets displayed on screen in real longitude and latitude

System Video

 

 

System Overview

LMX200 Overview

Theory

Ground penetrating radar (GPR) technology uses radio waves to image objects in the subsurface. The subsurface may consist of soil, rock, asphalt and other materials. GPR systems emit high frequency radio wave pulses and detect the echoes that return from objects within the subsurface. Echoes are produced when the target material is different from the host material (eg. PVC pipe in gravel) The GPR display shows signal amplitude versus depth (time) and sensor position along a line. This is called a "Line Scan". Since radar energy radiates in a 3D cone shape rather than a thin beam, a hyperbola (or inverted U) is the GPR response from a small point target like a pipe, rock, or a tree root. The radar wave hits the object before and after going over it and forms a hyperbolic reflection that can appear on the record even though the object is not directly below the radar. Grid scans are conducted to generate depth slices over a given area. This is useful for locating all known and unknown objects, as well as their orientation, in a graphical manner that is easy to interpret.

Configurations

The LMX 200 comes in two configurations:

  • LMX 200 Basic 200 is a standard locate and mark machine. It is for the user that only wants to be able to mark targets as they go.
  • LMX 200 Enhanced opens up a whole new world. It is capable of collecting lines and grids for viewing in the field and also for viewing in the office for reporting. Having geotagged data, when use in conjunction with the external GPS, means that reports can integrate information from Google maps and CAD.

Operation

Line Scan

Line-Scans

The first mode of operation is the line scan or B-Scan mode. The image is essentially a vertical slice into the ground following the path of the antenna. The LMX200 has a number of features that make the Line Scan mode easy to work with:

Back Up Indicator- Essentially this allows the using to back up the system and see on the screen any features that correspond with the location. The depth of the target can also be estimated using the cross hairs that appear.
DynaQ- this advanced patented technology that adjusts data quality as the system movement speed varies. It also gives the operator an indication of the perfect speed to travel at by giving a colour scale that is easy to follow.
Zoom- should the operator wish to increase the depth or length of scan shown on the screen this can be done on the fly without stopping the scan.
Gain- Since the material being scanned absorbs the GPR signal, deeper targets return weaker signals. Gain acts like an audio volume control, amplifying signals and making deeper targets appear stronger in the image. Gain values vary from 1 to 9. This easy to use feature can also be controlled on the fly.
DynaT- DynaT is a feature that can selectively enhance small, medium or large size targets for easier viewing and detection. Pressing DynaT cycles between options: All, Small, Medium and Large. Each option allows the user to enhance part of the ultra-wide band (UWB) spectrum to focus on those desired features.
Soil Cal- The soil calibration (also known as velocity) is a parameter used to ensure that measured depths are accurate. The best way to ensure this is by using the hyperbola-fitting method, since it is based on data collected in the area. This can be done live during a scan (or after) and is made easy to use by allowing the user to select a soil type and then fine tune the velocity for the best results.
Interp- Short for field interpretation, Interps are used to mark subsurface features. Seven colours are available, which allow you to designate different types of subsurface objects. Either during collection, back-up or review, you can simply touch anywhere on the screen to add an Interpretation These field interpretations remain with the data and can be used to check if a feature is linear (in Map View or in Google EarthTM), but only if the more accurate external GPS is used.

Grid Scan

Grid-ScanA grid scan is a group of lines scans collected in parallel lines criss-crossing and area. A grid scan image is produced which allows the user to view the area scanned in a plan view. The user can view the plan in several slices at different depths depending on the targets found. This is useful for locating all known and unknown objects, as well as their orientation, in a graphical manner that is easy to interpret.

The LMX200 is the only system on the market which allow Grid Scans to be collected and viewed on the system itself. It also simplifies the collection of this data which can be a challenge in the field. The users has the option of 5m x5m, 10m x10m or 15m x 15m grid sizes with line spacing from 0.25-1m. Once created the user has the ability to view the individual line scans, view 0.1m depth slices, adjust colour and colour sensitivity as well as using grid lines to accurately locate targets in the field.

Lines collected in the grid can be truncated if there are obstructions. Lines can also be retaken during the scanning process or after the final grid scan has been viewed. The easy to follow diagrams on the screen means the user will find it hard to lose track of their progress.

Map View

Map-View2Map View is a unique feature that allows the user to graphically view the path travelled by the system, and any flags or interpretations made. This is helpful in determining the linearity and consistency of buried objects. It will also display a view showing the lines collected as part of a grid.

A common use of this feature is to snake back and forth over a given area. Each time you cross a target producing a hyperbola, back up to the top of the hyperbola and add an interpretation. If the object is a linear feature, all the interpretations will line up when viewed in Map View.

Map View only works if GPS data is collected with the GPR data.

Configurations

The LMX 200 comes in two configurations:
LMX 200 Basic 200 is a standard locate and mark machine. It is for the user that only wants to be able to mark targets as they go.
LMX 200 Enhanced opens up a whole new world. It is capable of collecting lines and grids for viewing in the field and also for viewing in the office for reporting. Having geotagged data, when use in conjunction with the external GPS, means that reports can integrate information from Google maps and CAD.

On-board Reporting

Short-ReportBoth the LMX 200 and LMX 200 Enhanced allow for screenshots to be taken in line scan and grid scan mode (as well as map view for the LMX 200 Enhanced). The image is saved as a jpg that can be transferred to PC using the USB stick. Additionally provided the WiFi and Email are set up and connected you can email selected images directly from the system itself. These "Short Reports" can be emailed to a customer or colleague and contain information about the scan and the screenshot selected. Interps can be captured in screenshots so this excellent feature means most jobs are complete when you leave site even if reporting is required..

Software

The LMX 200 Utility Suite Software comes as part of the LMX 200 Enhanced Bundle or as a separate accessory pack. It includes the following modules:

Ekko_project Software

LineView module: for modifying and displaying GPR lines. Including:

  • Image optimization of gain, colour palette, contrast and sensitivity, as well as wiggle trace options.
  • Velocity measurement from hyperbolas and CMP data files.

LineView-Vel-Match

SliceView module: for modifying and displaying slices from GPR grid data and plotting them in Google Earth (.kmz) files.

Google-Earth-with-Slices

Interpretation Module: for adding point, polyline, box and annotation interpretations to GPR lines in post-processing

Line-Scan-Interps2s

Reports can be directly generated from Ekko_project to contain report information, scans, interpretation and explanatory notes. The report can be branded for supply to customers through the insertion of logos etc.

GPS

The LMX200 has an internal GPR. Essentially this does not provide the resolution for geo-locating individual scans but is used for error-logging and tracking of the systems movements. The LMX-200 Enhanced comes with a TopCon SRG-1 antenna with 2m horizontal resolution. The system has a dedicated mount, and data transfer/power cable. The GPS is powered from the systems battery.

Specifications

Specification Value
Height 115 cm
Width 70 cm
Length 100 cm
Weight 26 kg
Power 1.25A @ 12 V
Battery Sealed Lead Acid, 4-8 hours, 9 Ah
Environmental IP 65
Temperature - 10 °C -> 50°C
Signal Enhancement Dyna Q stacking, DynaT
Data Analysis In field, Enhanced processing Ekko_Project
Data Storage 350 km of line data

VIC:

Melbourne

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t (03) 9938 3830

m 0428 315 502

NSW:

Sydney

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t (02) 9986 1857

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QLD:

Brisbane

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t (07) 3040 6166

m 0419 477 715

WA:

Perth (Head Office)

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t (08) 9322 4020

m 0408 034 668

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