TAILIEUCHUNG - Air Pollution Part 11

Tham khảo tài liệu 'air pollution part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Instrumentation and virtual library for air pollution monitoring 243 The main objective of this work is to realize an intelligent system for environmental quality control and monitoring based on specialized sensors that are connected in a unit system. 3. System architecture The hardware of environmental quality monitoring systems sensors conditioning circuits acquisition and communication must usually be complemented with processing blocks to perform different tasks associated to one-dimensional or multi-dimensional data that flow on the system measurement channels. The architecture is composed as follows the specialized sensors detection circuit a prototype data acquisition board PC-host. Using all this hardware we are able to perform a study for Taguchi-type gas sensors. Intelligent system achievement which is dedicated for particular application is not easy. It presume a selection of chemical sensors area which provide a large information quantity and complex algorithms development for signal processing. The developed environmental monitoring systems EMS that use a prototype data acquisition board perform different tasks like multi-sensors multi-point measurement continuum real-time monitoring across limits warnings save data etc. Air quality parameters can be monitories from interested areas like public places enterprises etc. The desktop PC and LabVIEW software have the fallowing functions - DAQB control - Data processing and results display - Data storage and data administration - User warning - Analysis and decision etc. Fig. 1. System architecture. 244 Air Pollution Data acquisition system The data acquisition system is a low cost board realized around the chip LM12H458 that is an integrated DAS and offers a self-calibrating 12-bit a sign A D converter with choice of single ended fully differential or mixed inputs with on-chip differential reference 8-input analog multiplexer sample-and-hold an impressive flexible programmable logic system and a choice