Design and characterization of a PVDF ultrasonic range sensor

Fiorillo, Antonino S.

doi:10.1109/58.165552

Cited by 80 publications

(38 citation statements)

References 5 publications

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“…In fact, some important features of the electrophysiological signals determined by timefrequency analysis (e.g., different brain states, from sleep to cognitive processing) are reflected by different oscillations in the ECoG [27]. Spectral analysis was carried out within each band of interest, that is, delta (1-4 Hz), theta (4-7 Hz), alpha (8-13 Hz), beta (14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29), and gamma (30-100 Hz).…”

Section: Discussionmentioning

confidence: 99%

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Biomimetic Sonar for Electrical Activation of the Auditory Pathway

et al. 2017

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Relying on the mechanism of bat's echolocation system, a bioinspired electronic device has been developed to investigate the cortical activity of mammals in response to auditory sensorial stimuli. By means of implanted electrodes, acoustical information about the external environment generated by a biomimetic system and converted in electrical signals was delivered to anatomically selected structures of the auditory pathway. Electrocorticographic recordings showed that cerebral activity response is highly dependent on the information carried out by ultrasounds and is frequency-locked with the signal repetition rate. Frequency analysis reveals that delta and beta rhythm content increases, suggesting that sensorial information is successfully transferred and integrated. In addition, principal component analysis highlights how all the stimuli generate patterns of neural activity which can be clearly classified. The results show that brain response is modulated by echo signal features suggesting that spatial information sent by biomimetic sonar is efficiently interpreted and encoded by the auditory system. Consequently, these results give new perspective in artificial environmental perception, which could be used for developing new techniques useful in treating pathological conditions or influencing our perception of the surroundings. BackgroundUltrasound (US) plays an important role in the environmental perception of many species of mammals (such as rats and bats) for communication and survival; indeed, they use incoming US to gather information about incumbent danger, food availability, and navigational ranging [1]. Although Rodentia and Microchiroptera do not claim a common phylogenetic origin, recent literature reports that there are certain similarities in both mammals regarding anatomical organization [2,3]. Moreover, the cortical area arrangement and cortical frequency processing are similar to other mammals [4][5][6].US frequency range of bats and rats partially overlaps and both eutherian lineages possess similar encoding process of mechanical US waves, although with different aims as spatial navigation and social communication [7,8]. In this study, a method for stimulating rats neural centres by using a bats bioinspired neuroelectronic interface is proposed. The electronic system for US signal processing is based on the natural sonar of Pteronotus parnellii and was previously investigated for modulating brain activity [9,10]. This study demonstrated ultrasound waves, which are properly decoded into bioelectrical signals, travelled along the acoustic pathway, and successfully reached cortical areas, processing sensorial information according to the environment or to cognitive demands. Similarly, exogenous stimulation may alter sensory perception by acting on the neural networks [11].Hereafter, we have investigated how different signal patterns, emulating ultrasound echoes, affected brain activity by means of implanted electrodes connected to an electronic interface. Different patterns of echo signals at 50 ...

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Section: Discussionmentioning

confidence: 99%

“…They are structurally equal and interchangeable, with a resonance frequency which can be modified by changing the bending radius as described in [21]. The resonance frequency is described by the equation:…”

Section: The Sonarmentioning

confidence: 99%

Biomimetic Sonar for Electrical Activation of the Auditory Pathway

et al. 2017

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“…[7][8][9] However, ultrasonic, laser rangefinder, or infrared sensors cannot capture color and texture features of the environment and suffer from other propagation sounds, electromagnetic waves, or light. 10,11 In addition, they are affected by soft surfaces and specular reflection and have a high sensitivity to external electric fields. 10,11 Among autonomous navigation methods, visionbased systems have been growing in recent years due to rapid gains in computational power and the reliability of visual sensors.…”

Section: Introductionmentioning

confidence: 99%

“…10,11 In addition, they are affected by soft surfaces and specular reflection and have a high sensitivity to external electric fields. 10,11 Among autonomous navigation methods, visionbased systems have been growing in recent years due to rapid gains in computational power and the reliability of visual sensors. In this research, the major enhancements concern the main aspects of the autonomous navigation system: the mapping operation.…”

Section: Introductionmentioning

confidence: 99%

Multi-sensors multi-baseline mapping system for mobile robot using stereovision camera and laser-range device

Faisal

Mathkour

Alsulaiman

2016

Advances in Mechanical Engineering

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Countless applications today are using mobile robots, including autonomous navigation, security patrolling, housework, search-and-rescue operations, material handling, manufacturing, and automated transportation systems. Regardless of the application, a mobile robot must use a robust autonomous navigation system. Autonomous navigation remains one of the primary challenges in the mobile-robot industry; many control algorithms and techniques have been recently developed that aim to overcome this challenge. Among autonomous navigation methods, vision-based systems have been growing in recent years due to rapid gains in computational power and the reliability of visual sensors. The primary focus of research into vision-based navigation is to allow a mobile robot to navigate in an unstructured environment without collision. In recent years, several researchers have looked at methods for setting up autonomous mobile robots for navigational tasks. Among these methods, stereovision-based navigation is a promising approach for reliable and efficient navigation. In this article, we create and develop a novel mapping system for a robust autonomous navigation system. The main contribution of this article is the fuse of the multi-baseline stereovision (narrow and wide baselines) and laserrange reading data to enhance the accuracy of the point cloud, to reduce the ambiguity of correspondence matching, and to extend the field of view of the proposed mapping system to 180°. Another contribution is the pruning the region of interest of the three-dimensional point clouds to reduce the computational burden involved in the stereo process. Therefore, we called the proposed system multi-sensors multi-baseline mapping system. The experimental results illustrate the robustness and accuracy of the proposed system.

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“…Most ultrasonic transducers have a very narrowband response, which makes them unsuited to broadband applications. In recent years, broadband ultrasonic transducers have been developed using PVDF transducers [10], [11]. However, these need a high voltage supply and do not provide good range, which makes them unsuitable for mobile and low power applications.…”

Section: Introductionmentioning

confidence: 99%