355, 532, and 1064 nm picosecond laser interaction with grass tissues

Kim, Jaehun; Ki, Hyungson

doi:10.1063/1.4768684

Cited by 4 publications

(16 citation statements)

References 16 publications

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“…In Part I of this study, 8 we found that for k ¼ 355 and 532 nm, laser interacts predominantly with chlorophylls and for k ¼ 1064 nm dry matter is the primary light absorbing constituent of grass. Therefore, at these wavelengths, light is absorbed primarily by grass tissues.…”

Section: Introductionmentioning

confidence: 98%

“…The concentrations of water, chlorophylls, carotenoids, and dry matter for Kentucky bluegrass are adopted from Ref. 8 and summarized in Table I. Figure 2 presents the a Â C curves for chlorophylls, carotenoids, dry matter, and water from k ¼ 300 nm to 14 lm.…”

Section: Theoretical Investigation Of Grass Optical Propertiesmentioning

confidence: 99%

“…Therefore, a Â C represents the actual absorption by each grass constituent taking into account grass composition and thickness. 8 The optical properties of plant leaves considering leaf mesophyll structures have been studied mainly for remote sensing applications. 11,13,14 In this study, specific absorption coefficients of chlorophylls (a chl ) and carotenoids (a car ) were obtained from Ref.…”

Section: Theoretical Investigation Of Grass Optical Propertiesmentioning

confidence: 99%

“…In our previous study, 8 we considered grass as a complex optical system consisting of two types of pigments (i.e., chlorophylls and carotenoids), water, and dry matter. 10 Because water constitutes an average of 66.4% of plant leaves 11 and the primary objective of this work is to study laser grass interaction targeting water contained in grass, we need to first understand how the absorption of light by water changes as wavelength varies.…”

Section: Theoretical Investigation Of Grass Optical Propertiesmentioning

confidence: 99%

“…In fact, this area has been limited to human tissues because of numerous medical applications. 7 In a recent article by the authors, 8 for the first time, laser interaction with green plant leaves was studied systematically using 355, 532, and 1064 nm picosecond lasers and Kentucky bluegrass. As well known, grass is not only an important landscaping and agricultural material but is also an important biomass material.…”

Section: Introductionmentioning

confidence: 99%

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CO₂and Er:YAG laser interaction with grass tissues

Kim¹,

Ki²

2013

Journal of Applied Physics

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Plant leaves are multi-component optical materials consisting of water, pigments, and dry matter, among which water is the predominant constituent. In this article, we investigate laser interaction with grass using CO 2 and Er:YAG lasers theoretically and experimentally, especially targeting water in grass tissues. We have first studied the optical properties of light absorbing constituents of grass theoretically, and then have identified interaction regimes and constructed interaction maps through a systematic experiment. Using the interaction maps, we have studied how interaction regimes change as process parameters are varied. This study reveals some interesting findings concerning carbonization and ablation mechanisms, the effect of laser beam diameter, and the ablation efficiency and quality of CO 2 and Er:YAG lasers. V C 2013 American Institute of Physics.

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Section: Introductionmentioning

confidence: 98%

Section: Theoretical Investigation Of Grass Optical Propertiesmentioning

confidence: 99%

Section: Theoretical Investigation Of Grass Optical Propertiesmentioning

confidence: 99%

Section: Theoretical Investigation Of Grass Optical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CO₂and Er:YAG laser interaction with grass tissues

Kim¹,

Ki²

2013

Journal of Applied Physics

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Using energy requirements to compare the suitability of alternative methods for broadcast and site-specific weed control

et al. 2019

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The widespread use of herbicides in cropping systems has led to the evolution of resistance in major weeds. The resultant loss of herbicide efficacy is compounded by a lack of new herbicide sites of action, driving demand for alternative weed control technologies. While there are many alternative methods for control, identifying the most appropriate method to pursue for commercial development has been hampered by the inability to compare techniques in a fair and equitable manner. Given that all currently available and alternative weed control methods share an intrinsic energy consumption, the aim of this review was to compare methods based on energy consumption. Energy consumption was compared for chemical, mechanical, and thermal weed control technologies when applied as broadcast (whole-field) and site-specific treatments. Tillage systems, such as flex-tine harrow (4.2 to 5.5 MJ ha−1), sweep cultivator (13 to 14 MJ ha−1), and rotary hoe (12 to 17 MJ ha−1) consumed the least energy of broadcast weed control treatments. Thermal-based approaches, including flaming (1,008 to 4,334 MJ ha−1) and infrared (2,000 to 3,887 MJ ha−1), are more appropriate for use in conservation cropping systems; however, their energy requirements are 100- to 1,000-fold greater than those of tillage treatments. The site-specific application of weed control treatments to control 2-leaf-stage broadleaf weeds at a density of 5 plants m−2 reduced energy consumption of herbicidal, thermal, and mechanical treatments by 97%, 99%, and 97%, respectively. Significantly, this site-specific approach resulted in similar energy requirements for current and alternative technologies (e.g., electrocution [15 to 19 MJ ha−1], laser pyrolysis [15 to 249 MJ ha−1], hoeing [17 MJ ha−1], and herbicides [15 MJ ha−1]). Using similar energy sources, a standardized energy comparison provides an opportunity for estimation of weed control costs, suggesting site-specific weed management is critical in the economically realistic implementation of alternative technologies.

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Propagation of ultrasonic guided waves in plant leaves

Collazos-Burbano¹,

Ealo²,

Villagrán-Munı́z³

2020

J. Phys. D: Appl. Phys.

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In this work, dispersive wave propagation in plant leaves is studied using a long distance laser-based ultrasonic method. Guided waves traveling through and along the midrib, as well as in the lamina, are measured and analyzed via wave attenuation, characteristic diagram and dispersion curves. Additionally, an estimation of the leaf elastic properties using the Rayleigh–Lamb model, supported by thickness-resonance frequency constraints, is proposed. This study paves the way for the development of acoustic fingerprints for the identification of leaves and their non-invasive and fairly non-destructive mechanical characterization, which is highly related to the plant hydraulics and photosynthetic activity.

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355, 532, and 1064 nm picosecond laser interaction with grass tissues

Cited by 4 publications

References 16 publications

CO₂and Er:YAG laser interaction with grass tissues

CO₂and Er:YAG laser interaction with grass tissues

Using energy requirements to compare the suitability of alternative methods for broadcast and site-specific weed control

Propagation of ultrasonic guided waves in plant leaves

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355, 532, and 1064 nm picosecond laser interaction with grass tissues

Cited by 4 publications

References 16 publications

CO2and Er:YAG laser interaction with grass tissues

CO2and Er:YAG laser interaction with grass tissues

Using energy requirements to compare the suitability of alternative methods for broadcast and site-specific weed control

Propagation of ultrasonic guided waves in plant leaves

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Product

Resources

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CO₂and Er:YAG laser interaction with grass tissues

CO₂and Er:YAG laser interaction with grass tissues