Software Applications

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Software

Several software applications were written and used to operate the hardware described in the previous section. This section is a description of the software used in the research.

A software application that controlled the positioning system, the waveform generator, the power supply and the data acquisition from the CPD sensor was written in a graphical programming environment LabView (from National Instruments). The Labview environment was chosen because of the ease of use in user graphic interface designing and the availability of all necessary libraries and drivers for the Labview from the hardware manufacturer. The Labview provided hundreds of built-in libraries for advanced analysis and data visualization as well. The written application communicated with the DAQ PC card and the indexer ISA card installed in the PC to control incoming data from the CPD sensor and its motion over a sample surface. A graphic user interface was also provided to control hardware, to visualize and monitor signals and to set up measurement parameters as well. The application was used to postprocess data and visualize results of surface scanning in 2D and 3D view. A schematic diagram of the application is displayed in Figure 3.17.

Positioning system software

The positioning system manufacturer provided software routine libraries to help to develop programs for the 6400 series motion controller. These libraries were compiled in the Labview to make it usable in this environment.

Figure 3.17: Schematic diagram of the Labview application.

Using routines from compiled libraries the application communicated through the PC ISA card with the indexer to control velocity, direction and acceleration of the motion of the CPD sensor....

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