Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Design of a Versatile and Low Cost μVolt Level A to D Conversion System for Use in Medical Instrumentation Applicatio | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 370171 6 pages doi 2008 370171 Research Article Design of a Versatile and Low Cost Volt Level A to D Conversion System for Use in Medical Instrumentation Applications Kerry Williamsand Neil Robinson School of Applied Sciences RMIT University Melbourne Victoria 3000 Australia Correspondence should be addressed to Kerry Williams Received 27 November 2007 Revised 3 April 2008 Accepted 14 August 2008 Recommended by . Chung Modern medical facilities place considerable reliance on electronic instrumentation for purposes of calibration and monitoring of therapeutic processes many of which employ electrical and electronic apparatus that itself generates considerable levels of interference in the form of background electromagnetic radiation EMR . Additionally diverse ambient conditions in the clinical environment such as uncontrolled temperature humidity noise and vibration place added stress on sensitive instrumentation. In order to obtain accurate repeatable and reliable data in such environments instrumentation used must be largely immune to these factors. Analogue instrumentation is particularly susceptible to unstable environmental conditions. Sensors typically output an analogue current or voltage and it can be demonstrated that considerable overall benefit to the measuring process would result if sensor outputs could be converted to a robust digital format at the earliest possible stage. A practical and low cost system for A to D conversion at Volt signal levels is described in this work. It has been successfully employed in portable radiation dosimetry instrumentation and used under diverse clinical conditions and it affords an improvement in signal resolution in excess of an order of magnitude over commonly used analogue techniques. Copyright 2008 K. Williams and N. Robinson. This is an open access article distributed under .
