This paper presents a novel coding method for sonar systems, used by autonomous mobile vehicles. The coding method is developed to protect a proper and high accuracy work for the ultrasonic sensors and to allow them an operation without complications by the range measurement, if multiple vehicles with identical sonar systems move the same time. The specific of the known ultrasonic sensors in th...

We have recently introduced a novel approach to sonarbased object recognition for robotics. The sonar recognition system—consisting of a Polaroid sonar coupled with an A/D data acquisition board in a LINUX-based PC— uses a fuzzy ARTMAP neural network classification system to recognize objects at varying distances. In this article we report additional results in which we test systematically reco...

This paper presents a strategy for fuzzy logic based robot navigation in uncertain environments by multisensor integration. The main idea of the study is to coordinate conflicts and competitions among multiple reactive behaviors efficiently by fuzzy sets and a rule base. To achieve this objective, an array of ultrasonic sensors and a vision system are mounted on a mobile robot. The ultrasonic s...

Highly textured undoped (pure) and Al doped ZnO nanocrystalline thin films prepared by ultrasonic atomization and pyrolysis method are reported in this paper. ZnCl2 water solution was converted into fine mist by ultrasonic atomizer (Gapusol 9001 RBI Meylan, France). The mist was pyrolyzed on the glass substrates in horizontal quartz reactor placed in furnace. The Structural and microstructural ...

Successful in-situ monitoring of crack initiation and growth is a necessary prerequisite for applying ultrasonic methods to structural health monitoring. For conventional ultrasonic testing methods, a focused beam may be used to directly image the crack tip; however, this method is difficult to apply during fatigue testing because of access limitations and couplant contamination issues. However...

Ultrasonic sensors are commonly used in robotics for range measurement in obstacle detection and avoidance systems. They have also been used for localization by map matching techniques. This paper presents a novel use of ultrasonic sensors for the measurement of angular position of a mobile robot relative to a known ultrasonic source. The method is based on measurement of the phase difference o...

High data transmission efficiency is a key requirement for an ultrasonic phased array with multi-group ultrasonic sensors. Here, a novel FIFOs scheduling algorithm was proposed and the data transmission efficiency with hardware technology was improved. This algorithm includes FIFOs as caches for the ultrasonic scanning data obtained from the sensors with the output data in a bandwidth-sharing w...

This paper introduces error eliminating rapid ultrasonic$nng(EERUF), a new method for firing multiple ultrasonic sensors in mobilerobot applications. EERUF allows ultrasonic sensors to fire at ratesthat are five to ten times faster than those customary in conventionalapplications. This is possible because EERUF reduces the number oferroneous readings due to ultrasonic noise ...

The modal vibration characteristics of new MEMS (microelectromechanical systems) ultrasonic sensors have been studied theoretically and experimentally. Such studies are needed in order to design MEMS sensors with improved sensitivity for detection of ultrasound. The determination of vibration behavior of such sensors is critical for a successful design, and a validated vibration characterizatio...