LabVIEW

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

Laborelec s future realisations are vibration analysis, control of inspection robots, and all types of system monitoring. LabVIEW will be used as common tool for developers for the coming years. The synergy effect of a common language for everything concerning acquisition, analysis and processing of data will be beneficial for the whole company. 

Signals from detectors were monitored on-line by Virtual Bench-Lab View computation programs or labVIEW 7 programs. Treatments of data were done using Origin 6.1. 

Function verification of user program written in Labview — We designed a simple device that uses a chart recorder, a battery, and four resistors to verify that the program performs as intended. Each arm of the programming tree was tested using different parameter entries. Figure 4.16 presents the raw data from one of the experiments. 

FIGURE 4.17 Control screen of a program written in Labview . 

Desnica, V. and Schreiner, M. (2006). A LabVIEW-controlled portable X-ray fluorescence spectrometer for the analysis of art objects. X-Ray Spectrometry 35 280-286. 

Plate 2 (Figure 6, Chapter 15, p. 309). Screen shot of the LabVIEW curve recognition program. 

This software used to for develop custom software versions for special situations. It is based on the LabView development package and includes the drivers required to operate the Transpector. 

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

A Low-Cost Dynamic Surface Tension Meter with a LabVIEW Interface and Its Usefulness in Understanding Foam Formation 102... 

In addition to computational chemistry, another use of computers in lab is the use of computers in the collection of experimental data. Two cited experiments (101,102) described the use of LabView in the physical chemistry laboratory, while the third involved computer data acquisition in an osmometry experiment (103). 

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. 

The second set-up concept from Microinnova, the Lab Experiment Toolbox , has some minor differences from the first concept. It was designed to speed up process development and reduce the time to market of chemicals or compounding products (Figure 4.25) [77]. A modular toolbox has been developed for laboratory-scale experiments. Small tube connections are used to connect various unit operation devices to each other. Process control and user interface are based on Fieldpoint and LabView or Microinnova Process Control. The integration of the sensors into the system is different to the previous concept. The Fieldpoint unit has a front panel, where sensors can be added on a plug-and-play basis. All experimental data are stored in spreadsheets, which can be transferred to common spreadsheet... 

Another important aspect during the development in the laboratory is that the plant set-up changes frequently. Hence it is highly desirable to work with a flexible and self-explanatory PCS system which is fully adjustable by the user to any specific process set-up. For this purpose, modular built-up software based on the computer language LabView , often used for laboratory applications, was developed and combined with also modular constructed hardware [77]. 

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. 

LabVIEW Front Panel display of g/function (top) and block diagram (bottom) for a Virtual Instrument (VI) for dynamic light scattering measurements. 

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. 

You should observe a dramatic improvement in the noise in gj(q,At) when a data set is taken with = 3,000,000. The LabVIEW gJ[q,At) values should be used to determine the diffusion constant D and thus the particle radius R, using Eq. (9) in the form... 

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