We have been developed 9.4 GHz X-Band linac and 250kW magnetron for X-ray nondestructive tes ting system for Condition Based Maintenance (CBM). Our linac's energy is 950 keV, which fits to Japanese regulation to take them to outside of radiation controlled area. This small port able linac enables to diagnosis the moving facility, such as bearing in Nuclear Power Plants....
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Development of 960keV X-Band Linac for Portable Nondestructive Testing System

This study proposes an innovative method for the monitoring the nuclear power plant. In this field, false detection of the trouble, both “false negative” and “false positive” will become a serious problem. In the other hand, since its complexity of nuclear power plant, simplicity of monitoring system is strongly required. Here, we propose a new simple and reliable health monitoring sensor n etwork system. Our pulse width modulation technique realizes a self-maintenance function in single signal line (token...
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Designing Reliable Sensor Network for Nuclear Power Plant

A new electromagnetic method for the nondestructive evaluation of electric pumps with ball bearings is proposed. A permanent magnet generates a static magnetic field and a coil of several hundred turns wrapped around it is used to pick up eddy currents induced inside rotating ball bearings and impellers. First, a method that makes use of the autocorrelation is applied to the signals of the ball bearings. A relation between the processed signals and the size of the defects in the bearings is obtained....
英字タイトル:
Electromagnetic Nondestructive Detection for Wounded Bearings and Correlation of Size of Defect and Signal

Neutron diffraction technique is one of prevailing method to measure inner structure of material, such as molecular arrangement and lattice spacing by means of penetration of neutron. In particular the residual stress measurement by neutron diffraction has been developed an d is greatly performed in many research facilities, because the examination of residual stress existing materials is critically important to estimate fatigue of the materials and to maintain structural objects for efficient utilization....
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Measurement of Inner Residual Stress of Bearing by Neutron Diffraction Technique

Abstract In the environment such as outer space where we cannot maintain the artifacts, it is the robustness that is important for artifacts. Thus the system which has the information processing circui t realizing self-maintenance function is desirable. So far some approach is tried to realize self-maintenance function using the qualitative reasoning technique. In this study, we try to apply distribu ted information processing technique to this qualitative reasoning information processor, by arranging many...
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Self-Maintenance Sensor Network Based on Mutual Communications With Reliability Index

Abstract I n an environment such as outer space where we cannot maintain the artifacts, it is the robustness that is important for artifacts. Thus the system, which has the i nformation processing circuit realizing self-maintenance function is desirable. So far some approach is tried to realize self-maintenance function using the qualitative reaso ning technique. In this study, we try to apply distributed information processing technique to this qualitative reasoning information processor, by arranging man...
英字タイトル:
Sensor Network Based on Mutual Communications With Reliability Index

Our portable X-band (9.3GHz) 950KeV linac has been successfully upgraded. The problems of RF power oscillation , beam current oscillation and reduction and finally lack of X-ray intensity were solved by replacing the axia l coupling cavities with the side-coupled ones. Designed X-ray dose rate of 0.05 Sv/min@lm is going to be achi eved. Length of the accelerating tube is reduced to less than 25 cm. X-ray source part with the local radiation shielding is connected by the flexible waveguide with the box of t...
英字タイトル:
Study on Portable X-band 950keV linac X-ray Sourcefor On-site Nondestructive Inspection

This study proposes an innovative method for the monitoring the nuclear power plant. In this field, false detection of the trouble, both “false negative” and “false positive” will become a serious problem. In the other hand, since its c omplexity of nuclear power plant, simplicity of monitoring system is strongly required. Here, we propose new method of signal processing and data transmission to realize reliable monitoring system consisted of multiple nodes of sensors....
英字タイトル:
Sensor Network for Nuclear Power Plant