National Instruments LabVIEW

Integration of National Instruments LabVIEW Software into the Chemistry Curriculum 101... 

Overall, most of the requirements for a process spectrometer/analyzer are straightforward to implement, but they do require attention at the design level. Another important area, which is FTIR-specific, is the user interface and the need to provide for industry standard data communications. Standard software packages do exist for process instrumentation. For prototype development, and even for the front-end interface in a standalone mode of operation, software products, such as Microsoft s Visual Basic and National Instruments LabView, are also important instrumentation development tools. Note that National Instruments also provides important computer-based electronics and hardware that meet most of the computer interfacing, and system control and communications needs for modem instrumentation. 

For the tribological measurements, the radial position of the slider during the tests was halfway between the inner and outer diameters of the disk, and the pivot-to-center distance was adjusted so that the slider skew angle was close to 0°. The disk rotation was started with the slider suspension on the load/unload ramp just off the edge of the disk. The slider was accessed to the test radius. The pressure control and measurement of the frictional displacement were performed with The National Instruments LabView software on a PC with interface cards. Average displacement and peak amplitude were recorded after each pressure decrement/incre-ment (4000 samples at 20 kHz for 200 ms). The pressure inside the tester was varied linearly from ambient (100 kPa) to 15 kPa and back up to ambient over about 3 min in approximately 1-kPa increments. At the end of the test, the slider was translated back to the load/unload ramp before stopping the disk rotation. 

The software is both developed using Microsoft Visual Studio. NET and National Instruments Labview and is capable of recording the data at various sample rates directly into an Excel file. 

Two different computer interfaces were created for datalogging for both wearable accelerometer subsystem and instrumented platform. The datalogging interfaces were created using both Microsoft Visual Basic and National Instruments LabView Software. All data could be exported as text file for further analysis. Both interfaces provided realtime display on data collected by both subsystems. Fig. 4 shows the interfaces of the subsystems. 

National Instrument s LabVIEW is the graphical programming language used for the development of this application. 

LabVIEW Front Panel display (top) of photomultiplier count rate in counts per second (cps) and block diagram (bottom) for a Virtual Instrument (VI) that measures this. The VI is used to count scattered photons using a counter (ctrO) on a National Instruments M622at PC board and is useful in optimizing die imaging optics and for ensuring adequate count levels for the experiment. 

The VI is used to count scattered photons using a National Instruments M622x PC board, and the basic functions of parts to C are described in the text. The detailed meaning of each icon, along with descriptions of the controlhng inputs and outputs, can be seen in LabVIEW by positioning the mouse cursor on the icon. See also the discussion in Chapter III of the use of LabVIEW in interfacing situations. 

The protective potential of different positions on the vessel was simultaneously gathered by National Instruments and the Labview 7.1 program. 

A digital acquisition card (DAC) connected to a computer (National instruments) for reading the photodetector signal in real time. The signal acquisition is controlled by a Labview-based application. 

FIGURE 4-18 LabVIEW Ironl panel for a data-acqnisiiion sysiem allows ihe user to choose parameters such as sampling rate, sample IcngUi. and tillering values. (Reprinied with permission of National Instruments Corporation.)... 

Fig. 5 Nanosecond time-resolved absorption spectrometer located in the author s laboratory. The excitation source is one of the harmonics (355 nm/532 nm, 7 ns FWHM) of a Nd YAG laser (Continuum Surelite I) or tunable visible light from an OPO (Opotek). Data are acquired at 5 Hz and analyzed with programs assembled using LabView (National Instruments) software. (View this art in color at w+vw.dekker.com.)...

The specially designed software, called olfaction software, controls the PC-based data acquisition and automated operation of all these cycles. The software has got features like programmable sequence control, dynamic fermentation profile display, datalogging, alarm annunciation, data archival, etc. The software has been developed in LabVIEW of National Instruments. Experimental conditions are as follows ... 

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