ultrasonic sensors research papers
RESEARCH PAPERS

ultrasonic sensors research papers




Investigation of laser and ultrasonic ranging sensors for measurements of citrus canopy volume
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ABSTRACT This study compared ultrasonic and laser measurements of citrus canopy volume with manual measurement methods. Fifteen trees with different canopy heights and volumes were used. Manual and ultrasonic measurements provided dimensions for 

Experimental characterization of polaroid ultrasonic sensors in single and phased array configuration
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ABSTRACT Many mobile robots use Polaroid ultrasonic sensors for obstacle avoidance. This paper describes the experimental characterization of these sensors using a unique, fully automated testbed system. Using this testbed, we gathered large data sets of 5,000- 

Citrus fruit identification and size determination using machine vision and ultrasonic sensors
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ABSTRACT Machine vision and image processing have been increasingly used for agricultural applications especially for detection of crop status and quality, and crop harvesting. Estimating the size of the fruit allows growers to get a good idea of the quality of yield. A 

Mobile robot navigation in narrow aisles with ultrasonic sensors
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ABSTRACT This paper describes an experimental obstacle avoidance system for mobile robots traveling through the narrow aisles of a warehouse. In our application the aisles are 91 cm (36" ) wide and the robot has a width of 64 cm (25" ), but the method described here 

Agricultural machinery safety alert system using ultrasonic sensors
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ABSTRACT This article introduces a conceptual safety alert system using ultrasonic sensors. The safety alert system was designed to detect moving objects in the vicinity of agricultural machinery. This system uses two ultrasonic sensors to detect the distances between the 

Global integration of ultrasonic sensors information in mobile robot localization
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ABSTRACT This paper describes an ultrasonic sensors localization system for autonomous mobile robot navigation in a semi-structured indoor environment. A peripheral ring of 24 ultrasonic sensors is used to obtain the information required for the localization process. 

3D gesture acquisition using ultrasonic sensors
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ABSTRACT 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 

Ultrasonic Sensors for the Elderly and Caregivers in a Nursing Home.
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ABSTRACT Workloads on caregivers in nursing home are increasing as the imbalance between the number of elderly people and that of caregivers becomes larger. Excessive workloads on caregivers must be reduced not only because they become burdens for 

Multimodal speech recognition with ultrasonic sensors.
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ABSTRACT In this research we explore multimodal speech recognition by augmenting acoustic information with that obtained by an ultrasonic emitter and receiver. After designing a hardware component to generate a stereo audio/ultrasound signal, we extract sub-band 

Research and development of radiation resistant ultrasonic sensors for quasi-image forming systems in a liquid lead-bismuth
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ABSTRACT The problems of the development of high-temperature radiation resistant ultrasonic sensors operating in a liquid lead-bismuth alloy are analysed. Experimental diffusion bonded bismuth titanate sensors for operation up to 450 C were developed. For acoustical 

Biomimetic smart antenna shapes for ultrasonic sensors in robots
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Antennas are ubiquitous devices in robotics in general and on autonomous robots in particular. They are used for sensing the environment and for maintaining communication links. In both cases, high frequency signals (eg, ultrasonic frequencies), are often used 

Evaluation of ultrasonic snow depth sensors for automated surface observing systems (ASOS)
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Snowfall and snow depth measurements are important to a variety of disciplines including commerce, transportation, winter recreation and water supply forecasting. The western United States depends on snowfall for 75% of their annual water supply

Using ultrasonic and infrared sensors for distance measurement
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ABSTRACT The amplitude response of infrared (IR) sensors depends on the reflectance properties of the target. Therefore, in order to use IR sensor for measuring distances accurately, prior knowledge of the surface must be known. This paper describes the 

A simulation model of indoor environments for ultrasonic sensors
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This thesis addresses the problem of extracting the map of an unknown environment from echo signals received by ultrasonic transducers. A new map-building method is developed and demonstrated through simulations for ultrasonic sensors. Ultrasonic transducer arrays 

Improved signal-to-noise wideband acoustic/ultrasonic contact displacement sensors for wood and polymers
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Research leading to a significant improvement in the signal-to-noise sensitivity of wideband acoustic/ultrasonic contact displacement sensors for wood and polymers is described. Design principles for such high-sensitivity sensors are reviewed. Comparisons of 

Ultrasonic sensors for capturing livescan of fingerprint biometrics
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JK Schneider ,Ultra-Scan Corporation, Amherst, New York ,ultra-scan.com Repeated testing by a variety of agencies and independent test groups throughout the last 20 years has demonstrated that biometric image quality is one of the top variables affecting biometric system accuracy and performance, having a strong influence on system 

Multimodal speech recognition with ultrasonic sensors
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ABSTRACT Ultrasonic sensing of articulator movement is an area of multimodal speech recognition that has not been researched extensively. The widely-researched audio-visual speech recognition (AVSR), which relies upon video data, is awkwardly high-maintenance 

Development of a hybrid device based on infrared and ultrasonic sensors for human resource management
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ABSTRACT Human resources are continuously gaining importance in association with construction site management. With increasing interest being shown in the use of state-of- the-art technologies such as radio frequency identification (RFID) in site management, we 

Impact damage detection in composite structures using passive acousto-ultrasonic sensors
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ABSTRACT This paper reports the application of piezoceramic devices for impact damage detection in composite structures. The study involves a simple impact experiment in which a mass is dropped on a composite panel. The plate is instrumented with piezoceramic 

On-line primary flow monitoring in the PWR hot legs during in-service inspection using high temperature ultrasonic sensors
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Our paper will present in detail the result of the qualification of the coupling material (comparison-attenuation-with the classic organic coupling material used for low temperature operation), the signal attenuation due to pipe steel crossing and global performance in 

Least Entropy-Like Approach for Reconstructing L-Shaped Surfaces Using a Rotating Array ofUltrasonic Sensors
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ABSTRACT This paper introduces a new algorithm for accurately reconstructing two smooth orthogonal surfaces by processing ultrasonic data. The proposed technique is based on a preliminary analysis of a waveform energy indicator in order to classify the data as 

Control of a Simple DC Motor Robot Equipped with Ultrasonic Sensors Via a Field Programmable Gate Array and a Speech Recognition Board and Microphone
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ABSTRACT This paper documents a feasibility study showing the initial development into building a practical robotic speech controlled system; this can be used to assist people with disabilities, gaining more of their independence back. Speech recognition is a very useful, 

Clustering and PCA for Reconstructing Two Perpendicular Planes Using Ultrasonic Sensors
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ABSTRACT In this paper, the authors make use of sonar transducers to detect the corner of two orthogonal panels and they propose a strategy for accurately reconstructing the surfaces. In order to point a linear array of four sensors at the desired position, the motion of a digital 

Ultrasonic and Electromagnetic Sensors for Downhole Reservoir Characterization
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ABSTRACT The current work covers the evaluation of ultrasonic and electromagnetic (EM) techniques applied to temperature measurement and flow characterization for Enhanced Geothermal System (EGS). We have evaluated both ultrasonic techniques and microwave 

Cancelling sinusoidal interferences in ultrasonic applications with a BSS algorithm for more sources than sensors
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ABSTRACT Sinusoidal interferences are found in ultrasonic signals when we try to characterize a material, as for example interferences coming from PC cards. We are interested in obtain a robust method that cancels these interferences preserving the 

The ultrasonic level sensors for precise alignment of particle accelerators and storage rings
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Tasks of slow ground motion studies and high accuracy alignment of large accelerator machine components are important now. In accordance with the program of collaboration between BINP, Russia, SLAC and FNAL, USA, the development of the Slow Ground 

Navigation of Autonomous Mobile Robot Using Ultrasonic and Infrared Sensors
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ABSTRACT –The aim of this paper is to briefly describe proposed algorithms for an autonomous mobile robot. These algorithms concern data processing from sensors, description of environment from these data and finally navigation on these data. Results from these 

Ultrasonic snow depth sensors for measuring snow in the US
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In the early and mid 1990s the National Weather Service (NWS) deployed the Automated Surface Observing System (ASOS) at airport locations across the US The introduction of automated sensors for measuring surface weather conditions led to the abandonment or 

Ultrasonic snow depth sensors for National Weather Service (NWS) snow measurements in the US: Evaluation of operational readiness
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2. BACKGROUND During the 2004-2005 snow season, ultrasonic snow depth sensors from two manufacturers were tested at 14 ASOS and Cooperative observer sites across the US The snow depth sensors utilize ultrasound to measure distance. The sensors transmit a 50 

Structural health monitoring of strands in P/C structures by embedded sensors andultrasonic guided waves
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ABSTRACT The detection of structural defects and the measurement of applied loads in strands is important to ensure the proper performance of civil structures, including post- tensioned concrete structures and cablestayed or suspension bridges. Ultrasonic guided 

Radiation tolerance tests of ultrasonic oxygen deficiency sensors
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ABSTRACT The Large Hadron Collider (LHC), presently under construction at CERN, will contain about 96 tons of high-density helium (liquid and supercritical), mostly located in the underground components of the LHC machine. To detect a dangerous decrease of 

Piezoelectric acoustic sensors and ultrasonic transducers based on textured PZT thin films
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Micro-electro-mechanical systems (MEMS), or microsystems constitute a fascinating world of miniaturized devices that are just beginning to affect many areas of our life ,[2]. The idea behind MEMS is not new. MEMS were foreseen by the legendary physicist Richard 

Classifying Quadrupeds and Bipeds Employing micro-Doppler Active Ultrasonic Sensors
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S Desai, S Quoraishee ,ncpa.olemiss.edu ABSTRACT Proposed here is a series of techniques exploiting micro-Doppler ultrasonic sensors capable of characterizing various detected mammalian targets based on their physiological movements captured a series of robust features. Employed is a combination 

Home Surveillance system using Ultrasonic Sensors
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K Rajalakshmi, R Chakrapani ABSTRACT Each ultrasonic sensor module includes a transmitter and a receiver, and the modules are placed in a line direction. Because the ultrasonic transmission will spread at a beam angle, we use multiple ultrasonic receivers to receive the ultrasonic transmission. If 


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