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We report a method to directly measure the jumping force during the coalescence of two water droplets on a superhydrophobic surface using a MEMS-based force sensor as shown in Figure 1(a). The sensor is designed to measure the jumping force during the coalescence of two droplets whose radii are several hundred μm. The measurement results show that the maximum jumping force could be more than 10 times...
This paper presents a novel control method for autonomous-odor-source localization using vision and odor sensing by micro air vehicles (MAVs). Our method is based on biomimetics, which enable highly autonomous localization. Our method does not need any instruction signals, including even global positioning system (GPS) signals. An experimenter just blows a whistle, and the MAV starts to hover, to...
The continuous environmental radiation monitoring is very important after Fukushima accident especially for the evaluation of the decontamination. A portable gamma camera system is designed and fabricated with a compact digital front-end detector. A front-end detector consists of an 12 × 12 GAGG-APD (pixel size = 2 × 2 × 5 mm3) array combined with 144 channel Time over Threshold based ASIC. All the...
We are developing a portable Compton camera to be placed inside the human body for local inspection of metabolic functions of metastatic lymph node in gastric cancer. Before fabricating the portable Compton camera, Radioactivity measurement of metastatic and non-metastatic lymph nodes with an injection of FDG was conducted at the University of Tokyo Hospital. The detector that used to measure the...
In this work the feasibility of digital silicon Photomultipliers (dSiPM) coupled to GAGG (Gadolinium Aluminium Gallium Garnet) scintillator was tested as a Compton camera system for environmental radiation survey applications. The dSiPM is a newly developed photon counting device by Philips which digitizes the photon counts already on the cell level. One sensor tile consists of 4 × 4 dies with 2 ×...
We have designed, fabricated and tested a 64-channel ohmic-type CdTe detector for the gamma camera application with a conventional PHA (Pulse Height Analysis) circuit dynamic ToT based circuit. The pixel size of the detector is 2mm x 2mm and it consists of 8x8 arrays. The thickness of detectors is 1mm. Our group has been proposing the energy resolving Time over Threshold method with a dynamically...
An acoustic-optical integrated measurement deep-tow system called J-QUEST (the Japanese quantitative echo sounder and stereo-video camera system), consisting of a quantitative echo sounder and two synchronized cameras, has been developed for the observation of mesopelagic fishes such as lanternfish by the Fisheries Research Agency, Japan. The quantitative echo sounder is designed for measuring fish...
The purpose of this study is to discuss the mechanism of brain injury experimentally paying attention to the pressure changes on the surface of a brain agar phantom generated by a cavitation. In this paper, first, an experimental system for performing an simple impact experiment is presented. A simple human head model consists of a skull, cerebrospinal fluid (CSF) and brain tissue, represented by...
Finding objects and tracking their poses are essential functions for service robots, in order to manipulate objects and interact with humans. We present an approach for object detection and 3D pose estimation for autonomous mobile robots, that is suitable for general uses in a modularized robot control system. Our approach extracts local features from the input images, searches for the reference pattern,...
The purpose of this study is to discuss the mechanism of brain injury experimentally, with respect to the pressure changes on the surface of a brain agar phantom by cavitation. First, an experimental system to perform an impact experiment is presented. We present some images taken by a high-speed camera of the behavior of a simple physical head model with and without the brain agar phantom during...
We have previously proposed the three-dimensional (3D) display system based on the reconstruction of parallax rays. In order to display real 3D object, applying image-based rendering technique, we have also proposed a camera system that captures light ray data needed for reconstructing natural 3D images by using parallax rays reconstruction method from multiple images captured from multiple viewpoints...
We have developed three-dimensional endoscopic system by Compound Eye. The system consists of micro lens array and an image sensor. As a micro lens array, we used GRIN lens array. It decreases a cross talk which lens-to-lens occurs on image sensor. This module uses a micro-lens array to form multiple images, which are captured on a photo-detector array. Digital processing of the captured multiple...
We have previously proposed the thin natural three-dimensional (3D) display system based on the reconstruction of parallax rays. In order to display real 3D scene, applying image-based rendering technique, we have also proposed a camera system that captures light ray data needed for reconstructing 3D images by using parallax rays reconstruction method from multiple images captured from multiple viewpoints...
In the field of ITS technology, many methods have been proposed for detecting and recognizing road signs from car-mounted cameras. Most of these techniques are, however, for only still images. Therefore, the recognition results are affected by occasional changes of light conditions or occlusions. Moreover, though recognition of far placed signs are meaningful for safety driving, these signs are taken...
This paper describes a camera system based on the ray-space principle, as a system for three-dimensional (3D) image input of the 3D display based on the principle of the reconstruction of parallax rays. Applying the principle of ray-space representation, which is one type of image-based rendering technology, we have proposed a camera system that captures light ray data needed for reconstructing 3D...
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