Time series analysis of duty cycle induced randomness in thermal lens system

Vimal Raj (Avtor), Mohanachandran Nair Sindhu Swapna (Avtor), K. Satheesh Kumar (Avtor), Sankaranarayana Iyer Sankararaman (Avtor)

Povzetek

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.

Ključne besede

time series analysis;fractal analysis;photothermal lens spectroscopy;fractal dimension;

Podatki

Jezik:	Angleški jezik
Leto izida:	2020
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UNG - Univerza v Novi Gorici
UDK:	54
COBISS:	113801475
ISSN:	0030-4026
Št. ogledov:	456
Št. prenosov:	0
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

URN:	URN:SI:UNG
Vrsta dela (COBISS):	Delo ni kategorizirano
Strani:	str. 1-5
Zvezek:	ǂVol. ǂ212
Čas izdaje:	Jun. 2020
DOI:	10.1016/j.ijleo.2020.164720
ID:	15832539