| Title: | Time series analysis of duty cycle induced randomness in thermal lens system |
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| Authors: | ID Swapna, Mohanachandran Nair Sindhu, UNIVERSITY OF KERALA (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | The present work employs time series analysis, a proven powerful mathematical tool, for investigating the complex molecular dynamics of the thermal lens (TL) system induced by the duty cycle (C) variation. For intensity modulation, TL spectroscopy commonly uses optical choppers. The TL formation involves complex molecular dynamics that vary with the input photothermal energy, which is implemented by varying the duty cycle of the chopper. The molecular dynamics
is studied from the fractal dimension (D), phase portrait, sample entropy (S), and Hurst exponent (H) for different duty cycles. The increasing value of C is found to increase D and S, indicating that the system is becoming complex and less deterministic, as evidenced by the phase portrait analysis. The value of H less than 0.5 conforms the evolution of the TL system to more anti-persistent nature with C. The increasing value of C increases the enthalpy of the system that appears as an increase in full width at half maximum of the refractive index profile. Thus the study establishes that the sample entropy and thermodynamic entropy are directly related. |
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| Keywords: | Time series analysis
Fractal analysis
Photothermal lens spectroscopy
Fractal dimension
Hurst exponent
Sample entropy |
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| Year of publishing: | 2020 |
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| Number of pages: | 5 |
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| Numbering: | 4, 212 |
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| PID: | 20.500.12556/RUNG-7469 |
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| COBISS.SI-ID: | 113801475 |
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| DOI: | https://doi.org/10.1016/j.ijleo.2020.164720 |
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| NUK URN: | URN:SI:UNG:REP:ZNJG54FK |
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| Publication date in RUNG: | 05.07.2022 |
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| Views: | 2149 |
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| Downloads: | 0 |
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