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Advanced AE Technology for High-Power Microwave Radar Tubes.
Acoustic emission (AE) is one of the most important non-destructive testing (NDT) methods for materials, constructions and machines. Acoustic emission is defined as the transient elastic energy that is spontaneously released when materials undergo deformation, fracture, or both. This interdisciplinary book consists of 17 chapters, which widely discuss the most important applications of AE method as machinery and civil structures condition assessment, fatigue and fracture materials research, detection of material defects and deformations, diagnostics of cutting tools and machine cutting process, monitoring of stress and ageing in materials, research, chemical reactions and phase transitions research, and earthquake prediction.
This book is intended for all those professionals with interest in developing a basic background in acoustic emission and its use as a non-destructive testing technique. The monitoring of high-power microwave radar tubes is an example of the use of such techniques. This book will also be of interest to those involved in the design, maintenance and procurement of high-power microwave radar tubes. And finally, it is also intended for those students of physics and engineering interested in specializing in acoustics and acoustic techniques.
Acoustic emission (AE) is one of the most important non-destructive testing (NDT) methods for materials, constructions and machines. Acoustic emission is defined as the transient elastic energy that is spontaneously released when materials undergo deformation, fracture, or both. This interdisciplinary book consists of 17 chapters, which widely discuss the most important applications of AE method as machinery and civil structures condition assessment, fatigue and fracture materials research, detection of material defects and deformations, diagnostics of cutting tools and machine cutting process, monitoring of stress and ageing in materials, research, chemical reactions and phase transitions research, and earthquake prediction.
In the earlier phases of the Microwave Tube Built-In Test (MTBIT) program (1999-2001), a new advanced nondestructive testing technique was demonstrated using acoustic emission (AE) for in-situ monitoring of normal and abnormal performance of high- power radar tubes such as magnetrons, traveling wave tubes (TWTs), and klystrons. This report details the next step in transitioning the laboratory MTBIT system into a system that is compatible with condition-based maintenance systems employing the Integrated Condition Assessment System (ICAS) used by the Fleet. This report identifies the interface requirements for the sensors and ICAS, as well as accommodating limitations of the ICAS software, which currently is not configured to accommodate the sensor data rates and data sets required. Ten new electronic circuits were designed, built, and tested to interface the outputs of the current sensor and acoustic emission sensor attached to a magnetron through an OPTO22 digital and analog input/output (I/O) hardware along with its Optomux protocol, and the ICAS software (Version 4.11). The complete computerized system to monitor the in-situ performance of the high-power microwave tube was developed, tested, and reported here. The system could be extended to achieve the same goal with other microwave tubes such as TWTs and klystrons with minor modifications.
This thesis is a study of the recent advances in microwave device technology that can be applied to the improvement of phased array radar systems which are able to provide multifunction capabilities to navy ships. The study was undertaken to provide guidance to military planners who are often required to keep abreast of developments in a rapidly changing field of technology. The fact that even the most advanced presently used radar systems in the navy are based on five to ten year-old technology, verifies the need for this study. Microwave Power Modules which combine vacuum tube and Solid State technology have been developed and have demonstrated advanced performance characteristics. Their advantages, such as very wide bandwidth and ability to operate at much higher ambient temperatures over that of the Solid State devices have opened up new opportunities for their use in Radar systems. However, output power capability of MPM while growing rapidly is still below the minimum level required for a phased array radar on board a midsize hip operating in confined waters. The present technology available however in Solid State Transmit Receive modules, does supply the capabilities needed for a realization of an active phased array radar. Such a system will enhance ships operational capabilities while achieving a reduction of the prime power consumption as well as in needed space. The applicability and characteristics of these devices re presented in this thesis.
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