PSOC BASED DIGITAL FILTER DESIGN FOR PROCESSING SODIUM FLOW FROM EDDY CURRENT FLOWMETER FOR SAFETY OF SODIUM COOLED FAST BREEDER REACTORSPoornapushpakala Suriyamoorthi and Gomathy Chidambaram
Safe operation of the nuclear reactor is important for secure human life and their environment. Continuous monitoring of sodium flow is done by a measuring electronics which ensures the protection of reactor from loss of coolant. This paper discusses a novel approach in the design and implementation of digital signal conditioning system which is free of computation. It is developed for improving the performance of the analog signal conditioning circuit of the measuring electronics used for eddy current flowmeter. This flowmeter is employed in sodium cooled fast breeder reactors for monitoring the sodium flowrate. Sodium is the main coolant of the reactor. Hence monitoring is essential to check performance of primary sodium pump which ensures the safety of the reactor. The present work involves in bandpass filter design using Programmable system on Chip (PSoC) microcontroller which is a part of the monitoring system. The signal to noise ratio of the design is 15 dB as against 2.4 dB of the existing analog signal conditioning system. The average response time of the digital signal conditioning system is improved to 10.64 ms.
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