Article

Control and acquisition software for the U of C Seismic Physical Modelling Facility

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Abstract

The University of Calgary Seismic Physical Modelling System has undergone significant upgrading. In particular, the positioning system now uses high-precision, high repeatability linear electric motors. Motor control and digital data acquisition are now done by two commercial circuit boards installed in a desktop computer running under the Windows XP Professional operating system. We present an overview of the configuration process needed to enable the eight linear motors that constitute the new positioning system. The use of two separate computer boards (one for motion control and one for data acquisition), coupled with multichannel transmitter and receiver capability, require complex software that synchronizes motion with acquisition. The successful amalgamation of C and C++ code from the separate SDKs (software development kits) provided with the two boards to obtain a single master control program constitutes a simple application of robotics. We have formulated design criteria for control and acquisition software to make scale-model seismic surveying an automatic and efficient procedure. Prototype code based on these criteria, and combining functions from the two separate SDKs, has been developed and is being tested in the Visual Studio integrated development environment.

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... The Aries software development kit (SDK) is used to write customized software in C/C++. A detailed description of the design of the control and acquisition software for the Physical Modelling Facility is described by Wong et al. (2008). ...
Article
The University of Calgary Seismic Physical Modelling System has undergone significant upgrades. These upgrades include the implementation of a precise eight-axis positioning system based on modern linear electric motors, smaller piezoelectric transducers for ultrasonic sources and detectors, design of arrays of receiving and transmitting transducers, better high-voltage circuits for driving the source transducers, and improved amplifier electronics for the receivers. The various essential components have been combined mechanically and electronically in order to form a complete system that is able to automatically run acquisition experiments simulating high-fold 3D marine and land seismic surveys. Testing of the system, and integration with a master program for system control, are on-going.
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Article
The University of Calgary Seismic Physical Modelling System has undergone significant upgrades. These upgrades include the implementation of a precise eight-axis positioning system based on modern linear electric motors, smaller piezoelectric transducers for ultrasonic sources and detectors, design of arrays of receiving and transmitting transducers, better high-voltage circuits for driving the source transducers, and improved amplifier electronics for the receivers. The various essential components have been combined mechanically and electronically in order to form a complete system that is able to automatically run acquisition experiments simulating high-fold 3D marine and land seismic surveys. Testing of the system, and integration with a master program for system control, are on-going.
A physical seismic modeling system
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  • M B Bertram
  • D C Lawton
Cheadle, S.P., Bertram, M.B., and Lawton, D.C., 1985, A physical seismic modeling system, University of Calgary: Current Research, Geological Survey of Canada, Paper, 85-1A, 149-153.
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  • E V Gallant
  • M B Bertram
Lawton, D.C., Cheadle, S.P., Gallant, E.V., and Bertram, M.B., 1989, Elastic physical seismic modelling, CREWES Research Report, 1, 273-288.