The Evolution of Virtual Instrumentation
Abstract:
This paper presents the evolution of instrumentation and its applications. A virtual instrumentation is computer software that a user would employ to develop a computerised 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 . Virtual instrumentation extends also to computerised systems for controlling processes based on data collected and processed by a computerized instrumentation system.
Virtual instrumentation systems typically also comprise pure software instruments, such as oscilloscopes and spectrum analysers ,for processing he collected sensor data and messaging it in ways useful to the users of the data. Also, data collecting hardware devices differ in their internal structures and functions, requiring virtual instrumentation systems to take these differences into account. Thus, some data acquisition devices are so-called “register-based” instruments, controlled by streams of 1s and 0s sent directly to control components within the instrument; others are “message-based” instruments, and are controlled by “strings” of ASCII characters, effectively constituting written instructions that must be decoded within the instrument.
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