A mobile robot system, capable of performing various tasks for the physically disabled, has been developed. To avoid collision with unexpected obstacles, the mobile robot uses ultrasonic range finders for detection and mapping. The obstacle avoidance strategy used for this robot is described. Since this strategy depends heavily on the performance of the ultrasonic range finders, these sensors a...

Control method for moving robotics in closed areas based on creation and sharing maps through shortest path findings and obstacle avoidance is proposed. Through simulation study, a validity of the proposed method is confirmed. Furthermore, the effect of map sharing among robotics is also confirmed together with obstacle avoidance with cameras and ultrasonic sensors. Keywords-domestic robotics; ...

This paper proposes new method for object reference which enables a person to find surrounding objects and develops a navigation system named CoCo. CoCo employs an ultrasonic directional speaker with a rotating base. Ultrasonic wave transmitted by an ultrasonic directional speaker is converted to audible sound when it reflects on floor, wall, or object. Based on this property, CoCo can emit aud...

This work aimed to contribute to the modelling of slurry flows in horizontal pipes supported by experimental data gathered in a well instruments pilot rig. An ultrasonic sensor system was inserted in the pipe in order to calculate the slurry velocity profiles using a time domain correlation method. Effects of particles concentrations and slurry flow rates were investigated. A comparison of the ...

This paper describes an ultrasonic tagging system developed for robustly observing human activity in a living area. Using ultrasonic transmitter tags with unique identifiers, the system is shown through experimental application to be able to track the three-dimensional motion of tagged objects in real time with high accuracy, resolution and robustness to occlusion. The use of an ultrasonic syst...

Research and musical creation with gestural-oriented interfaces have recently seen a renewal of interest and activity at Ircam. In the course of several musical projects, issued either by from young composers enrolled in the Cursus of Composition and Computer Music or by guests artists, the Pedagogy and Creation departments of Ircam have proposed various solutions for gesture-controlled sound s...

Flexural ultrasonic transducers are principally used as proximity sensors and for industrial metrology. Their operation relies on a piezoelectric ceramic to generate a flexing of a metallic membrane, which delivers the ultrasound signal. The performance of flexural ultrasonic transducers has been largely limited to excitation through a short voltage burst signal at a designated mechanical reson...

This paper presents a novel ultrasonic sensing system for autonomous mobile systems. We describe how wide-angled ultrasonic transducers can be used to obtain substantial information of the environment. This can be achieved by exploiting the overlapping of the detection cones from neighbor sensors. The ultrasonic sensing system also allows the detection of multiple echoes from different echo pat...

INTRODUCTION Noncontact transfer devices are demanded when silicon wafers or glass plates are carried in clean environment. Because contact of such products with a conveyer belt damaged their surface, non-contact transfer devices are needed for the use in clean environment. Many transfer devices using ultrasonic, electromagnetic or electrostatic levitation have been proposed. The authors also h...

Laser ultrasonic sources and guided wave sensing methods, using sub-wavelength miniature sensors, are utilized to nondestructively evaluate composite materials. These methods enable in-plane characterization of the ultrasonic signals directional velocities. Additionally, sensing of the guided wave modes changes, in the geometrically complex composite structures, enables detection of the materia...