2015
DOI: 10.1250/ast.36.248
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Estimation of water stress of plant by vibration measurement of leaf using acoustic radiation force

Abstract: In order to estimate the water stress of a plant, the natural frequency of the leaf-stalk system was investigated. As a means of vibrating the leaf, acoustic radiation force was utilized, and the successive measurement of the natural frequency of ''komatsuna'', which was cultivated in a pot of soil, was performed for a week until wilting after stopping irrigation. As a result, it was found that the natural frequency is decreased drastically by the wilting of the leaf before the drooping occurs. In addition, da… Show more

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Cited by 12 publications
(5 citation statements)
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“…Adapting plant vibration measurement to HTP is a challenge as the technique needs to be both nondestructive and fast (say about one minute per plant). Recent works showed promising technical improvements: by exciting leaf motion using acoustic waves and measuring the resulting leaf motion by a laser sensor, Sano et al [ 15 ] showed that water stress did modify the frequency of motion of a leaf. Nondestructive and fast, this technique is nevertheless difficult to apply to whole plants.…”
Section: Introductionmentioning
confidence: 99%
“…Adapting plant vibration measurement to HTP is a challenge as the technique needs to be both nondestructive and fast (say about one minute per plant). Recent works showed promising technical improvements: by exciting leaf motion using acoustic waves and measuring the resulting leaf motion by a laser sensor, Sano et al [ 15 ] showed that water stress did modify the frequency of motion of a leaf. Nondestructive and fast, this technique is nevertheless difficult to apply to whole plants.…”
Section: Introductionmentioning
confidence: 99%
“…This consists of applying a mechanical stimulation by pushing approximately the geometric center of the plant stem, as it was previously done in leaves by Sano et al, 2015. 14 However,instead of stimuli one leaf, stem was pushed. This practice contemplates the mechanical principle statement of no matter the force with which it is pushed after mechanical stimulation, the subsequent oscillation frequency is always the same and it was measured with the two abovementioned lasers.…”
Section: Experiments 1 -Natural Frequencymentioning
confidence: 99%
“…For example, the predominant peak response of the natural frequency of a tomato (Lycopersicon esculentum) plant's leaf was 5 Hz, which was calculated by applying an excitation force to the stem and using a laser vibrometer. 8,9 To measure vibration signals in alive tissue like plants correctly, it is necessary to have adequate sensors with high sensitivity and instruments that are able to measure very small displacements, such as laser doppler vibrometers. [8][9][10] For instance, a laser doppler (Polytec PSV-3D -B&K) has a wide bandwidth from 0 to 100 kHz, a frequency resolution of 2 Hz, and the ability to measure displacements in the order of femtometers.…”
Section: Introductionmentioning
confidence: 99%
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“…Thus, water stress can be accurately measured based on the water potential of a plant [5]; however, this method cannot be applied to real-time irrigation control systems because it requires the destruction of the plants being measured and hence is unsuitable for time series measurements. Several methods aimed at estimating water stress in real-time irrigation settings have been proposed, which involve estimating various plant-stress responses such as leaf vibration [6] and stem diameter variations [7][8][9][10][11][12][13][14][15][16]. The leaf vibration approach measures water stress using an ultrasonic speaker and microphone, while the stem diameter approaches involve employing contact-type displacement sensors.…”
Section: Introductionmentioning
confidence: 99%