Contact-less, non-resonant and high-frequency ultrasonic technique: Towards a universal tool for plant leaf study

Fariñas, María Dolores; Sancho‐Knapik, Domingo; Peguero‐Pina, José Javier; Gil‐Pelegrín, Eustaquio; Álvarez-Arenas, Tomás Gómez

doi:10.1016/j.compag.2022.107160

Cited by 7 publications

(7 citation statements)

References 31 publications

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“…The error in the measurement depends on the error in the determination of the phase slope. For non-dispersive materials, the wider the bandwidth, the smaller the error [ 28 ]. The signals were centered and the Fourier transforms were calculated using the Goertzel algorithm [ 33 ] with 200 points to represent the frequency range from 1 to 5 MHz and zero-padding to improve phase accuracy.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The phase slope provides an accurate way to determine the time delay and thus the propagation velocity, which is useful in dispersive media where the ultrasonic pulse is distorted as it propagates [ 27 ]. The slope of the phase spectrum has also been used to determine the propagation velocity in plant leaves [ 28 ], which is a property directly related to water content. The determination of the water content in plant leaves is important in agriculture and ultrasound has gained relevance in this topic in the last years [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic Monitoring of the Water Content in Concentrated Water–Petroleum Emulsions Using the Slope of the Phase Spectrum

Franco

Reyna

Duran

et al. 2022

Sensors

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This work proposes the slope of the phase spectrum as a signal processing parameter for the ultrasonic monitoring of the water content of water-in-crude oil emulsions. Experimental measurements, with water volume fractions from 0 to 0.48 and test temperatures of 20 °C, 25 °C, and 30 °C, were carried out using ultrasonic measurement devices operating in transmission–reception and backscattering modes. The results show the phase slope depends on the water volume fraction and, to a lesser extent, on the size of the emulsion droplets, leading to a stable behavior over time. Conversely, the behavior of the phase slope as a function of the volume fraction is monotonic with low dispersion. Fitting a power function to the experimental data provides calibration curves that can be used to determine the water content with percentage relative error up to 70% for a water volume fraction of 0.06, but less than 10% for water volume fractions greater than 0.06. Furthermore, the methodology works over a wide range of volume fractions.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasonic Monitoring of the Water Content in Concentrated Water–Petroleum Emulsions Using the Slope of the Phase Spectrum

Franco

Reyna

Duran

et al. 2022

Sensors

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“…Resonant ultrasound spectroscopes either measure differences in ultrasonic velocity as it propagates from a transmitter through the sample to an opposite‐facing receiver, or they measure echoed acoustic waves (Buckin et al, 2003). Research has determined a close relation between parameters extracted from ultrasonic resonance of leaves and relative water content and water potential (Farinas et al, 2021; Fariñas et al, 2022; Sancho‐Knapik et al, 2016). Analysing these water metrics in plant communities can help illuminate mechanisms of plant drought response in global vegetation models, which are necessary mechanism to understand when trying to assess and monitor plant health.…”

Section: Acoustics and Active Acoustic Transducersmentioning

confidence: 99%

Application of active acoustic transducers in monitoring and assessment of terrestrial ecosystem health—A review

Rostami

Nansen

2022

Methods Ecol Evol

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1. Urbanization, agricultural production, natural resource extractions and climate change are global drivers of terrestrial ecosystem degradation and decline in ecosystem health. Assessing vegetation structures provides valuable direct and indirect information on biodiversity and ecosystem health, since plant communities govern terrestrial ecosystem functions and overall biodiversity. 2. A growing body of literature supports the hypothesis that acoustic profiling and characterization of soundscapes may reveal natural patterns and ecosystem responses to environmental disturbances. Although assessments of ecosystem soundscapes are a promising tool for ecological monitoring, the influence of vegetation structure on acoustic indices remains largely unaddressed. An effective non-invasive approach to monitoring ecosystem health includes use of active acoustic transducers, which convert mechanical/acoustic energy into electrical energy and visa-versa.3. This article reviews and discusses possible applications (and also constraints) of active acoustic transducers in monitoring and assessments of terrestrial ecosystem health. Specifically, this article includes a brief introduction to the basic principles of sound and types of active acoustic transducers. Moreover, we provide reviews of common uses of active acoustic transducers in assessing plant structures and plant functional traits.4. We emphasize that active acoustic transducers can be used to analyse plant characteristics in a remote, scalable, non-invasive and cost-effective manner to characterize overall terrestrial ecosystem health. Suggestions and recommendations for future research and management directions that may facilitate applications of acoustic transducers to natural terrestrial landscapes are provided.

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“…Nakutis, P. Kaškonas. D.Liaukonis and L.Svilainis are with the Department of Electronics Engineering, Kaunas University of demonstrated that thickness resonances in the leaves could be excited and physical leaf parameters can be extracted using RUS [15,16]. This application is of concern in this publication.…”

Section: Introductionmentioning

confidence: 99%

“…HE ultrasonic thickness gauging is a well-established technique [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The principle is based on measuring the delay for ultrasonic pulse traversed the material thickness.…”

Section: Introductionmentioning

confidence: 99%

Air-Coupled Ultrasound Spectroscopy Air Parameters Compensation Technique

Nakutis,

Kaškonas,

Liaukonis

et al. 2024

IEEE Sensors J.

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The air-coupled resonance ultrasound spectroscopy (RUS) of thin plate thickness, density, ultrasound velocity and attenuation measurement are affected by air parameters. If air parameters are left unaccounted errors will occur. Conventional thermometer measurements are not efficient because temperature can vary faster than temperature sensor response. Technique for air parameters estimation and compensation of the RUS inverse solution results is proposed. The ultrasound delay over known distance is used for velocity in air estimation. There is no need for the additional measurement: the propagation time between transducers can be obtained from RUS calibration measurement. Ultrasound velocity in air is then used for temperature estimation. These measurements are augmented by pressure sensor measurement for air density estimation. Evaluation of the attainable measurement errors and analysis of uncertainties under such compensation was carried out using simulated signals. Sensitivity coefficients for every parameter were derived and attainable errors evaluated for temperature range from -5 °C to +40 °C and atmospheric pressure range from 94 kPa to 105 kPa. It was concluded that the relative uncertainty of sample attenuation, ultrasound velocity attenuation, density and thickness could be reduced approximately 22 times compared to case when air parameters are assumed to be equal to those in normal conditions. Experimental verification used 2 mm polycarbonate plate, measured values were compared against reported data. Experiment confirmed the efficiency of the proposed compensation: thickness estimation bias errors were reduced 17 times, bias errors for density were reduced 15 times and velocity estimation bias errors were reduced 5 times.

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Contact-less, non-resonant and high-frequency ultrasonic technique: Towards a universal tool for plant leaf study

Cited by 7 publications

References 31 publications

Ultrasonic Monitoring of the Water Content in Concentrated Water–Petroleum Emulsions Using the Slope of the Phase Spectrum

Ultrasonic Monitoring of the Water Content in Concentrated Water–Petroleum Emulsions Using the Slope of the Phase Spectrum

Application of active acoustic transducers in monitoring and assessment of terrestrial ecosystem health—A review

Air-Coupled Ultrasound Spectroscopy Air Parameters Compensation Technique

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