Virtual Instrumentation

TECHNICAL SEMINAR

VIRTUAL INSTRUMENTATION Prepared By :

INTRODUCTION A virtual instrumentation system is computer software that a user would employ to develop a computerized test and measurement system for controlling from a computer desktop an external measurement hardware device and for displaying test or measurement data collected by the external device on instrument-like panels on a computer screen.

TRADITIONAL Vs VIRTUAL

ADVANTAGES OF VIRTUAL INSTRUMENTS 

Lower costs of instrumentation

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Portability between various computer platforms Easy-to-use graphical user interface Graphical representation of program structures Code can be compiled to standalone .EXE or .DLL file TCP/IP connectivity (Web server integrated into virtual instrument)

CONCEPTUAL MODEL OF EARLY COMPUTERISED INSTUMENTATION

THE GENERAL CONCEPTION OF VIRTUAL INSTRUMENT

FRONT PANEL AND BLOCK DIAGRAM

VIRTUAL LABORATORY

BASIC COMPONENTS OF VI  Computer and Display  Software -Driver level software - Register Level Software -High-level tool software  Interconnect Buses  Instrument Hardware

INTERCONNECT BUSES

 SERIAL PORT

 GPIB  PC-BUS  VXI BUS

A VXI bus system controlled by GPIB

DISTRIBUTED MEASUREMENT SYSTEMS

LAB VIEW  Lab VIEW is a graphical programming language that uses icons instead of lines of text.  Lab VIEW is an integral part of virtual instrumentation.  A virtual instrument consists of an industry standard computer or workstation equipped with powerful application software, effective hardware, and driver software.

Interfaces of a VI  Front pane: Serves as the user interface.  Block diagram: Contains the graphical source code that defines the functionality of the VI.  Icon and connector pane: Identifies the VI so that you can use the VI in another VI. A VI within another VI is called a sub VI.  A sub VI corresponds to a subroutine in text-based programming languages

User Interface of Tank Simulation

Graphical Code of Tank Simulation

Conclusion  Virtual instrumentation is fueled by ever-advancing computer technology and offers you the power to create and define your own system based on an open framework.  LabVIEW was designed with scientists and engineers in mind, providing powerful tools and a familiar development environment created specifically for the design of virtual instruments.

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