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Thermal lens spectroscopy for the differentiation of biodiesel-diesel blends
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10.1063/1.3698002
/content/aip/journal/rsi/83/4/10.1063/1.3698002
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/4/10.1063/1.3698002

Figures

Image of FIG. 1.
FIG. 1.

The solid black lines are the thermal lens transients for diesel (B0), biodiesel (B100), and biodiesel-diesel blends (B5 and B10) at low (a) and high (b) excitation powers. The solid red lines indicate the TL theoretical curves (with θ eq = θ in Eq. (1)) and the solid blue lines correspond to the fit using Eq. (1), in which both the TL and MD effects are considered. The samples were placed in a quartz cuvette of 0.5 mm.

Image of FIG. 2.
FIG. 2.

θ values obtained from the fit to diesel (B0), biodiesel (B100), and biodiesel-diesel blends (B5 and B10) at different excitation powers, which were normalized by L and plotted as a function of excitation power. The solid lines represent theoretical linear curves from which L −1(θ/P) could be determined.

Image of FIG. 3.
FIG. 3.

Visible optical density spectra for diesel (B0), biodiesel (B100), and biodiesel-diesel blends (B5 and B10). The inset is zoomed to the region around 630 nm where the TL experiment was developed.

Tables

Generic image for table
Table I.

TL characteristic time (t c ); thermal diffusivity (D Th); MD time (τ); mass diffusivity D M, L −1(θ/P) and L −1(θ eq /P), due to the thermal and mass diffusion effects, respectively; the phase refractive index at 632.8 nm; the product between the absorption coefficient at 632.8 nm (A); and the refractive index change rate with the heat deposited in the heated cylinder (dn/dQ) for diesel (B0), biodiesel (B100), and biodiesel-diesel blends (B5 and B10).

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/content/aip/journal/rsi/83/4/10.1063/1.3698002
2012-04-03
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermal lens spectroscopy for the differentiation of biodiesel-diesel blends
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/4/10.1063/1.3698002
10.1063/1.3698002
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