Evaluation of acoustic microphone for sensing in-vessel noise

not registered; not registered; not registered

Acoustic sensing technique is regarded as one of means of to detect the unusual conditions detection in-a reactor vessel of FBR. This study aims at investigating data which are useful to develop the microphone which can be used continuously under sodium in a reactor vessel, and have good sensitivity and high temperature resistance. The acoustic characteristics of the existing high temperature microphone was investigated. And the shape and fixation of element and the inner structure of the microphone were confirmed by means of X-ray photographing. The arrangement, materials and environment resistance of the existing microphone were conjectured and subjects of the future development were picked up based on the above investigation's results.