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This work assesses the ability of tidal resources at two locations in the Western Pacific to supply enough power to support persistent oceanographic sensing equipment. We consider the extraction of energy in (1) the three Indonesian straits of Lombok, Ombai, and Timor, and (2) the four Philippines straits of Mindoro, Panay, Tablas, and Dipolog via a small-scale, bottom-mounted turbine. We then relate...
In this paper, we present a novel approach for the sensing of erosive cavitation phenomena in underwater facilities. Cavitation phenomena are known for their destructive capacity of underwater structures and are caused by the pressure decreasing followed by an implosion when the cavitation bubbles find an adverse pressure gradient. Conventional cavitation detection techniques are based on passive...
The Autonomous Surface / Sub-surface Survey System (ASSSS) research program combines long endurance autonomous surface vessels (ASVs) and long endurance autonomous underwater vehicles (AUVs) to create an integrated cooperative navigation system effectively transforming the capabilities and accuracy of AUV survey. ASV is leading the project, working alongside National Oceanography Centre, a world leading...
This paper reports what to our best knowledge is the first commercially delivered under-ice survey carried out by an autonomous underwater vehicle (AUV). The campaign was completed as a collaboration between Kongsberg Maritime (KM) and Ballard Marine Construction in January 2017. The surveys took place beneath a frozen lake in North America using a rental KM MUNIN AUV, with launch and recovery through...
In order to understand the underwater environment, it is essential to use sensing methodologies able to perceive the three dimensional (3D) information of the explored site. Sonar sensors are commonly employed in underwater exploration. This paper presents a novel methodology able to retrieve 3D information of underwater objects. The proposed solution employs an acoustic camera, which represents the...
Development of 3D-printed devices, sensors, and actuators has become increasingly popular in recent years due to low cost, rapid production, and device personalization. This personalization process allows development of devices with unique physical properties and phenomena that enhance the desired properties of the 3D-printed part. Biomimetics is a commonly used technique to develop 3D-printed devices,...
This paper presents a potentially cheap oxygen sensor based on photo acoustic (PA) principle. Commercially available low cost devices are used for this implementation. The presentation is focused on aspects related to PA signal analysis, PA chamber influence on sensor response and environmental humidity impact on sensor sensitivity.
This paper addresses the problem of joint wideband localization and acquisition of acoustic sources. The source locations as well as acquisition of the original source signals are obtained in a joint fashion by solving a sparse recovery problem. Spatial sparsity is enforced by discretizing the acoustic scene into a grid of predefined dimensions. In practice, energy leakage from the source location...
Circular differential microphone arrays (CDMAs) facilitate compact superdirective beamformers whose beampatterns are nearly frequency invariant, and allow perfect steering for all azimuthal directions. Herein, we eliminate the inherent limitation of symmetric beampatterns associated with a linear geometry, and introduce an analytical asymmetric model for Nth-order CDMAs. We derive the theoretical...
Sensing of food spoilage and contamination is an active area of research, with many types of contact and noncontact sensors are being developed that can track fresh food quality throughout the distribution process. In this paper, we consider the communication of the sensed product quality along with the box position (in the stack of boxes in the truck or in a warehouse room) to the next level, in...
This study proposes a novel wearable device, called HARS (Hybrid-based Aspiration and Respiration Sensing), made of a flexible material for respiratory measurement and home monitoring of asthma. This paper mainly mentions about the method of respiratory phase identification using respiratory sounds and chest movements. The main challenge is to implement chest movement acquisition with a small device,...
We have designed, implemented and evaluated the novel single array acoustic localization system SAILoc. The SAILoc system can interact with the commercial-off-the-shelf (COTS) smart phone and it is easier to deploy than multiple sensors' system. We also propose a robust time delay estimation (TDE) algorithm which is based on frequency domain (FD-TDE) and has an advantage over generalized cross-correlation...
In this paper some methods of ultrasonic signals energy estimation are presented. The origin of this study is a target strength and distance estimation using air coupled ultrasound sensors applied in ie. proximity sensors. In the pulse echo mode based systems the echo detection is based on signal threshold signal estimation. The signal threshold is associated with the signal energy, what implies incorporation...
Intelligent Wheelchair Bed (IWB) is an important direction. And it is also one of the most active research direction in the robot field. In this work, the obstacle avoidance algorithm based on the Artificial Potential Field (APF) using ultrasonic sensors is proposed and realized in order to achieve the real-time and continuing obstacle avoidance for the IWB. The IWB can keep on detecting the environment...
In recent years average life expectancy in developed countries has increased, hence the amount of people which depend on a wheeled walking frame and in addition are visually handicapped has grown. The independent mobility of this people is often limited since they need guidance by other humans. Recent research focused on technical guidance systems implemented on a walking frame. The mobile vehicle...
The determining problem of several fracton mixture srtucture of materials grinding in the gas jet mill is considered. The problem is solved by comparing the standard deviation of the standart power spectral density of acoustics signals of individual fractions and of the mixture ones.
This work describes the results of experiments conducted a part of an instrumented lead test in-core in a nuclear reactor with the piezoelectric and magnetostrictive materials. The experiments exposed AlN, ZnO, BiT, Remendur, and Galfenol to more neutron radiation than found in the literature. The magnetostrictive sensors produce stable ultrasonic pulse-echoes throughout much of the irradiation. The...
Single ultrasound device, capable of operating over dual or multiple frequencies, would benefit and expand a series of applications, such as acoustic cavitation enhancement, transdermal drug release, nondestructive testing, ultrasound and photoacoustic imaging. One of the approaches for a dual-frequency operation is to integrate both high- and low-frequency transducer elements in a single chip [1-3]...
Modification of dissolved gas content by acoustic droplet vaporization (ADV) has been proposed for several therapeutic applications. Reducing dissolved oxygen (DO) during reperfusion of ischemic tissue during coronary interventions could inhibit reactive oxygen species production and rescue myocardium. The objective of this study was to determine whether intravascular ultrasound (IVUS) can trigger...
Touchscreen sensors are widely used in many devices such as smart phones, tablets, laptops, etc. There are many different types of modalities that enable sensing the touch. The dominant technologies on the market are the capacitive, resistive, acoustic or ultrasound, and optical touch systems. None of these technologies are perfect and each has some advantages and disadvantages. Capacitive touch technologies...
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