TN-21 : Data aquisition system

Abstract

Data acquisition systems are used for collection, pre-processing and storage of signals. They provide an accurate, real-time analysis along with data collection and transmission for applications in hydro-meteorology, agricultural engineering, geophysics and related areas. Modern microprocessor-controlled systems can be classified as central data acquisition systems and remote data acquisition systems. The former type is suitable for central station applications, while the latter type is ideal for remote applications e.g. the automatic hydrologic and weather stations. Modular structure of these systems provides enormous expansion capabilities. Additional input/output devices, storage processing and communication facilities can be conveniently hooked up with these systems. The report describes general configurations of the two types ,i.e. Micromet and Auto Met.V,System,of data acquisition systems along with their typical applications. Automatic hydrologic system is described in more detail as it is being procured for installation at the National Institute of Hydrology. Some advanced, mostly electronic, hydrometeorological sensors have also been described as they form important components for use with such acquisition systems.