When building applications or products, it is essential to have the right systems that meet the application needs. Over the last 2 decades, personal computers have been adopted at a high rate. The developer's needs always tend to change. The system that they work on should be flexible to build their solutions. So, they need a system that meets their needs without having to replace the entire device. Laboratory Virtual Instrument Engineering Workbench (LabVIEW) from National Instruments is a development environment where we can create innovative graphical diagrams. In this post, we will give you a detailed understanding of virtual instrumentation. We will also give an explanation of how virtual instruments are different than traditional instruments. Let us go ahead into the details.
Virtual instrumentation is the process of combining commercial technologies like C, with measurement and control hardware. This produces systems that meet the expectations of applications for engineers and scientists. The industry-standard system that is built using the powerful application software and cost-effective hardware like plug-in boards is called a virtual instrument.
These virtual instruments enable engineers and scientists to test, control, and design applications. Although the circuit technology has advanced so much, it is the software that leverages the true potential of creating virtual instruments. They provide ways to innovate and reduce costs. Virtual instruments are necessary for product and process design, development, and delivery.
With virtual instrumentation, engineers can create user-defined instruments that help increase productivity, accuracy, and performance. LabVIEW speeds up the development by using symbolic or graphical representations.
Traditional instruments oscilloscopes and waveform generators are built to perform tasks defined by the vendor. So the user cannot perform their customized tasks. The instruments are developed with built-in circuitry that fits the nature of the instrument. The special technology used in building these instruments is expensive, making the overall instrument very expensive.
As virtual instruments are PC-based, it takes advantage of the latest technology already built within the PCs. Unline the traditional instruments with knobs and switches, the virtual instruments include powerful processors like Pentium 4 and an operating system like Windows, Mac OS, etc. They also make it possible to access the internet.
The key component of a virtual instrument is the software. With the right software, developers can design, create applications, and integrate routines that the process needs. They can also create a user interface that suits the needs of the application and the users. They explain how the application reads the data from the device, how it processes, manipulates, and stores the data, and how it presents the data back to the user.
Intelligence and decision-making capabilities can be built into the virtual instruments so that it adapts to the signal changes. It can also specify when processing power is required. The software also provides modularity. When developers work on a project, they divide the task into several sub-tasks. A virtual instrument can be built with reduced dependencies to solve these subtasks and then combine them to make up the main task.
LabVIEW provides an application development environment that is designed specifically to meet the needs of scientists and engineers. It offers features that connect to various hardware and software that make it easy for virtual instrumentation. It provides a graphical programming environment for developers. By using this graphical user interface, developers can create custom virtual instruments.
Developers can create graphical programs, control selected software, analyze data, and display the results. They can customize and include knobs, buttons, dials, and graphs that emulate control panels. The developers can also represent the control and operation of processes through graphical representation (block diagrams). LabVIEW provides built-in libraries to integrate stand-alone instruments, data devices, vision products, motion controls, and a lot more.
Key advantages of virtual instrumentation in LabVIEW
Elements of virtual instruments
With LabVIEW, developers use a graphical programming language with drag-and-drop icons for creating virtual instruments. LabVIEW uses data flow programming, where the execution order is specified by the flow of data. A virtual instrument contains 3 parts.
Front Panel - It is the user interface through which the users interact with the virtual instrument.
Block Diagram - It is similar to a flow chart, which includes the code to control the program.
Icon/Connector - It specifies the connection between a virtual instrument with another.
When the program is run, the users can give inputs and observe the given data being updated in real-time. The values through the block diagram are passed through wires or terminals. To start or stop a program, or any other function, controls can be used. The output data can be displayed through thermometers, lights, and any other indicators.
LabVIEW is a great tool for developers to create virtual environments. It provides control, function, and other palettes with graphical icons that can be used in either the front panel or the block diagram. With the many built-in libraries and functionalities, developers can build their own virtual instruments on an open framework, and maintain them for the long term.