Abstract: This study reports the development of a new microwave probe for the nondestructive testing of a pipe. Three-dimensional finite element simulations are carried out to optimize the profile of a microwave probe, whose results show that a probe with elliptic profile enables smaller reflection at the probes as well as much better single-mode propagation inside the pipe than conventional ones. Experimental validations are carried out using a straight brass pipe with an inner diameter of 39 mm and...
英字タイトル:
Enhancement of microwave nondestructive testing method for the inspection of pipes by optimizing the microwave probe profile

Recently, Unmanned Aerial Vehicle is used in many purpose such as wall inspection and disaster relief. When UAV flies indoor field, GPS can’t be used because radio waves from the satellites do not reach. Therefore, other positioning systems are necessary for indoor autonomous flight. Also detecting and avoiding obstacle system is necessary. In this study, we report the result of obstacle detecting / avoiding system using LIDARs. Also we present an indoor flight system including obstacle detecting and avo...
英字タイトル:
An Automatic Navigation System for Multi-copter

Abstract: In this paper, we show an implementation of AR-marker based flight routing system with smartphone-grade visible light camera and low-cost microcontroller board. It not depend on any other special equipment such as depth sensor and visual recongition and can continue to trace markers autonomously. This system is intended to be used as supplemental navigation method in the situation than other sophisticates locating method such as 3D-SLAM cannot be used in acctident or restriction....
英字タイトル:
Autonomous indoor navigation for drones with AR marker

For a long term data gathering over sensor network via battery powered wir eless node, intermittent operation and periodical sleep is mandatory to a chieve energy savings. Synchronized data transmission technique is widely used for this purpose and central controller is usually required. When th e synchronization is lost and a wireless node loses its counterpart, it sh ould start continuous observation and the power consumption increases. Su ch situation is commonly-seen in system failure. In this paper w...
英字タイトル:
Power management for wireless network with long-time sleeping nodes