The RAS-120 is a 72, 96 or 120-channel, high resolution, signal enhancement seismograph designed for shallow refraction and reflection surveys, and general geophysical exploration.
Oil & gas exploration
Surface wave analysis
EASY TO USE
Operating under Windows XP/Vista, the RAS-120 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-120 user interface is designed to allow direct access to important system functions.
And setting up the RAS-120 couldn’t be easier. Select the type of survey you want to perform -- refraction or 2D reflection with roll and the RAS-120 configures itself. And once you’re back in the office, you can review the observer's log and view pick and print records on your office system using the same software that you ran in the field.
120 Channel Shot
CONSISTENT DATA QUALITY
The RAS-120 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 an individual test to verify the performance of a particular specification or choose System Test and the RAS-120 will automatically step through all available tests. Results are graphically displayed and logged to disk. Tests include geophone pulse, geophone resistance, geophone similarity, leakage, amplifier noise, dynamic range, A/D offsets, amplifier pulse, CMR, system timing accuracy, channel to channel crosstalk, sine wave, phase similarity, and gain similarity.
REDUCED FIELD TIME SETUP
Finding faulty or marginal geophones and intermittent spread cables can be a real chore in the field, especially as the channel count goes up. But with geophone resistance, geophone pulse, geophone similarity, and cable leakage tests, the RAS-120 can easily locate geophone and cable problems before they affect your data.
Geophone Resistance Test
ADVANCED SYSTEM SOFTWARE
The RAS-120 provides advanced features such as an integrated observer's 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.
The system provides two adjustable filters which may be independently configured as low-cut, high-cut, bandpass or bandstop. For surveys using weight-drop or hammer energy sources, the signal enhancement feature may be used to add (stack) successive shots together to improve the signal-to-noise ratio. Individual shots may be stacked and unstacked as desired and the polarity of each stack may be changed to facilitate shear wave studies.
For 2D reflection shooting, the RAS-120 offers integrated line management with autoroll and a graphical line geometry display showing the shot point, roll direction, total number of channels on line, and active channel positions.