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Applications

• Geotechnical surveys
• Groundwater surveys
• Site remediation
• Rippability surveys
• Mining
• VSP and tomography

The RAS-24 is a modular 24-channel, high resolution, signal enhancement seismograph designed for shallow refraction and reflection surveys. Based on a "distributed" approach, like larger seismic systems used for oil and gas surveys, the RAS-24 is the first seismograph to combine state-of-the-art 24-bit conversion with a flexible, expandable architecture that provides the ease of use of a conventional system with the advantages of a distributed system.

Easy to use
Operating under Windows 98, the RAS-24 system software has a familiar point and click interface which is easy to learn and operate. With buttons, scroll bars and single key commands for commonly used functions, the RAS-24 user interface is designed to allow direct access to important system functions.
And setting up the RAS-24 couldn’t be easier. Select the type of survey you want to perform -- refraction, 2D reflection with roll, or 3D -- and the RAS-24 configures itself.

Expandable
The RAS-24 provides unique flexibility not found in other systems. Connect one RAS-24 to a laptop and you have a very portable 24-channel seismograph for refraction or reflection. Connect eight units together in a line and you have a 240-channel, 2D line complete with roll. Rearrange those same ten units and you have a ten line, 24 channel/line 3D spread. And no special hardware is required for any of these configurations. The system software manages the roll for 2D and the active portion of the spread for 3D operation so no roll switches or CDP cables are required.

48 Channel Single Line Layout

3 Line - 72 Channel Line Layout

Consistent Data Quality
The RAS-24 provides an extensive array of tests to ensure that the system is functioning properly and that your data is being accurately recorded. And the tests are easy to perform, requiring no external equipment or connections. Select the tests to perform, click the TEST button and the results are graphically displayed and automatically logged to disk. Tests include amplifier noise, dynamic range, A/D offsets, amplifier pulse, CMR, timing accuracy, crosstalk, sine wave, phase similarity, and gain similarity.

Reduced Field Setup Time

Advanced System Software
The RAS-24 provides advanced features such as an integrated observers log recorded with each record, and a time stamped shot log which provides a continuous log of recording activity allowing you to retrace events that happened in the field. For refraction or reflection surveys, data may be previewed, filtered, AGC'd, stacked or unstacked as desired.

The RAS-24 provides a broad range of intuitive display options which allows you to view the data the way you prefer. With a single click, you may expand or contract the display in the time or channel direction, display all the even or all the odd traces, or zoom in on an individual channel.

For 2D reflection shooting, the RAS-24 offers integrated line management with autorolland a graphical line geometry display showing the shot point, roll direction, total number of channels on line, and active channel positions.

For 3D surveys, the RAS-24 has an integrated, graphical 3D script editor for specifying how the RAS-24s are connected and which portion of the spread is active for each shot.
	3D Script Editor

And when you’re back in the office, you can review the observers log and view, pick and print records on your office system using the same software that you ran in the field.

RAS-24 Advantages Over Conventional Seismic Systems

• Expandable in inexpensive 24-channel units. Just add
  another RAS-24 and the system automatically recognizes it.
• No roll switch for reflection shooting. Roll is controlled
  by the system software.
• No heavy, expensive CDP cables. Uses 12-channel
  spread cables for all configurations.
• System designed from the ground up as a distributed system.
  Networking boxes together wasn't added as an after thought.
• Integrated 3D operation. The RAS-24 system software manages
  each line as an independent entity.
• All testing functions are built in and are controlled by the
  operator from the laptop using the RAS-24 system software.
• Since the RAS-24 acquisition unit is separate from the
  controller (the laptop), the controller may be easily upgraded
  to faster, more capable models as they become available.

Whether you’re looking for a 12 channel seismograph for small refraction jobs or a 240 channel system for 3D reflection, the RAS-24 has the data quality, features and performance you need for the most demanding jobs.

To download the RAS-24 system software or to receive a free evaluation copy by mail, please send a request to [email protected].

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