A Temperature Compensated Ultrasonic Sensor Operating in Air for Distance and Proximity Measurements

Canali, C.; Cicco, G. De; Morten, Bruno; Prudenziati, M.; Taroni, A.

doi:10.1109/tie.1982.356688

Cited by 77 publications

(26 citation statements)

References 2 publications

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“…The second pulse which arrives at time t 2 is then the reflection from the backwall. Assuming a linear dependence between temperature and ultrasonic velocity c which can be corrected for, 5,6 wall thickness can be calculated using…”

Section: A Wall Thickness Calculationmentioning

confidence: 99%

Application of the distributed point source method to rough surface scattering and ultrasonic wall thickness measurement

Jarvis

Cegla

2012

The Journal of the Acoustical Society of America

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The distributed point source method is commonly used to predict the complex acoustic field emitted by ultrasonic transducers. In this paper, it is presented as an alternative to conventional approaches often used when solving rough surface scattering problems. Surface shadowing and multiple scattering effects are inherently included in the mesh-free semi-analytical simulation method through matrix manipulation making it very efficient and simple to implement. Results are presented which illustrate the improvement in accuracy gained over the Kirchhoff approximation and the decrease in computational load over the finite element method, culminating in greater than an order of magnitude decrease in required simulation time. The method is applied to the practical problem of online wall thickness monitoring within corrosive environments, illustrating the variability in reflected pulse shape that could be expected from rough surfaces with similar statistics. Three commonly implemented time-of-flight algorithms are used to analyze a large number of simulated signals from which it is concluded that those based on first arrival time are more stable under increasing roughness conditions than those which are based on reflected pulse shape.

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Section: A Wall Thickness Calculationmentioning

confidence: 99%

Application of the distributed point source method to rough surface scattering and ultrasonic wall thickness measurement

Jarvis

Cegla

2012

The Journal of the Acoustical Society of America

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“…The system runs entirely on the changeable with no back-end connections. [2] Mobile phones are becoming the convergent platform for personal sensing, computing, and communication. This paper makes a shot to require advantage of this convergence towards the matter of automatic image tagging.…”

Section: Literature Reviewmentioning

confidence: 99%

A Survey on Macro Environment Sensing using Sensors in Smart Devices

Chavanke¹,

Saggu²,

Kurude³

et al. 2017

International Journal of Advanced Research in Computer and Comm

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A range of mobile and pervasive applications on recently smart phones. Although human-driven settings (e.g indoor/outdoor, at home/in work, driving walking) are wide researched. Proximity Sensing covering the various instances of phone use, situation, disposition, and cooperation altogether the approach right all the manner all the way down to earth utilizes with entangled shopper propensities. As an extended running middleware, Proximity Sensing considers every vitality utilization and shopper relationship. The preliminary results demonstrate that Proximity Sensing accomplishes low energy price, fast system preparation and competitive sensing accuracy.

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“…There are methods for temperature-compensated ranging, almost entirely based on some direct temperature measurement and use of either (6) or the Taylor-series approximation of it. Thermistors and resistance temperature detectors, for example, can be used to provide a temperature-dependent voltage [33], and as technology improves, one can find reasonably priced sensors with a rated accuracy of around ~0.1° or better. If there are temperature gradients in the acoustic medium, however, then further problems exist, and accuracies decrease still further.…”

Section: Limitations On Accuracymentioning

confidence: 99%

Time-of-flight measurement techniques for airborne ultrasonic ranging

Jackson

Summan

Dobie

et al. 2013

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Airborne ultrasonic ranging is used in a variety of different engineering applications for which other positional metrology techniques cannot be used, for example in closed-cell locations, when optical line of sight is limited, and when multipath effects preclude electromagnetic-based wireless systems. Although subject to fundamental physical limitations, e.g., because of the temperature dependence of acoustic velocity in air, these acoustic techniques often provide a cost-effective solution for applications in mobile robotics, structural inspection, and biomedical imaging. In this article, the different techniques and limitations of a range of airborne ultrasonic ranging approaches are reviewed, with an emphasis on the accuracy and repeatability of the measurements. Simple time-domain approaches are compared with their frequency-domain equivalents, and the use of hybrid models and biologically inspired approaches are discussed.

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A Temperature Compensated Ultrasonic Sensor Operating in Air for Distance and Proximity Measurements

Cited by 77 publications

References 2 publications

Application of the distributed point source method to rough surface scattering and ultrasonic wall thickness measurement

Application of the distributed point source method to rough surface scattering and ultrasonic wall thickness measurement

A Survey on Macro Environment Sensing using Sensors in Smart Devices

Time-of-flight measurement techniques for airborne ultrasonic ranging

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