Innovative spectroscopy of liquids: a fiber optic supercontinuum source and an integrating sphere for scattering-free absorption measurements

Mignani, A. G.; Ciaccheri, L.; Cacciari, Ilaria; Ottevaere, Heidi; Thienpont, Hugo; Parriaux, Ο.; Johnson, Mark

doi:10.1109/icsens.2009.5398218

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…The scattering effect, on the other hand, is much harder to measure directly, which requires specially designed instruments (e.g., Sullivan and Twardowski, 2009) and has only been successfully done on liquid suspensions (e.g., seawater) and jet streams of small particles. Fortunately, the absorbance of a scattering medium, though not as easy to measure as extinctance, can be measured using an integrating sphere (Elterman, 1970;Fry et al, 1992;Nelson and Prézelin, 1993;Mignani et al, 2009), which blends the scattered light together with the transmitted light. Therefore, scatterance is best quantified by subtracting absorbance from extinctance.…”

Section: Box A: Dispersion Systems and Their Optical Propertiesmentioning

confidence: 99%

Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning

Jin,

Palke,

Renfro

et al. 2023

G&G

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regon sunstone is a significant feldspar gemstone with growing popularity, and certainly one of the most famous gemstones produced in the United States. Found in weathered lava flows, these basaltic phenocrysts have poorly developed cleavages and few inclusions or twins due to the disordered structure resulting from a fast cooling rate (Xu et al., 2017;Jin et al., 2018Jin et al., , 2019, making them more suitable for faceting than other feldspar gemstones. Their popularity comes mainly from the wide range of appealing colors (figure 1), from the more common yellow, pink, orange, and red to the extremely rare green-blue (www.oregonsunstoneguide.com/typesand-colors.html). Many of these colors have not been found in feldspar from anywhere else in the world. The term sunstone was originally defined (Andersen, 1915) as the gem variety of aventurine feldspar, showing intense play of light and colors caused by strong reflections from thin oriented metallic inclusions of visible sizes, a phenomenon known as aventurescence. The loosely defined word schiller is more commonly used to describe the aventurescence of sunstones in the gem community (the two terms are used interchangeably in this article). Most sunstones, such as those from India, Norway, and Tanzania, owe their aventurescence effect to hematite inclusions. Copper-containing aventurine feldspar was first documented by Andersen (1917), who studied specimens reportedly from Modoc County, California. This county borders southern Oregon, an area hosting

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Section: Box A: Dispersion Systems and Their Optical Propertiesmentioning

confidence: 99%

Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning

Jin,

Palke,

Renfro

et al. 2023

G&G

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“…The olive oil sample under test was contained in a glass vial having a volume of 32 cm 3 . This setup was previously used for lubricant oil analysis -it allowed for a successful spectral fingerprinting of the lubricant oil and for predicting functional parameters and wear indicators [21]. …”

Section: Diffuse-light Absorption Spectroscopymentioning

confidence: 99%

Diffuse-light absorption spectroscopy and chemometrics for discrimination and quantification of extra virgin olive oil adulterants

et al. 2010

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A selection of top-quality extra virgin olive oils with excellent nutraceutic properties was artificially adulterated by means of lower-grade olive oils commonly used in commercial counterfeits. The oil sample set was analyzed by means of diffuse-light absorption spectroscopy performed in the wide 400-1700 nm spectral range. A setup based on optical fiber technology was experimented, which made use of an optical fiber supercontinuum source. The spectroscopic library was processed by means of a Partial Least Squares regression for quantifying the adulterant concentration, followed by a Principal Component Analysis and Linear Discriminant Analysis for identifying the type of adulterant. I. PROTECTING EXTRA VIRGIN OLIVE OILExtra virgin olive oil (EVOO) is the only vegetable oil that is consumed as it is -freshly extracted from the fruit. Thanks to its balanced taste and flavored aroma, EVOO is capable of enhancing the most popular gastronomic recipes and is thus considered the chef's gold. EVOO also offers highly beneficial health effects, thanks to both its high content of monounsaturated fatty acids, vitamins, and polyphenols -the antioxidant substances.EVOO, besides containing the highest levels of antioxidants, has the highest amount of monounsaturated fatty acids. It is a "healing fat", since it controls the "bad" LDL cholesterol levels while raising the "good" HDL ones [1,2]. Studies have shown that people who consumed 25 ml (about 2 tablespoons) of EVOO daily for 1 week presented less oxidation of LDL cholesterol and higher levels of antioxidant compounds in the blood [3], and, more generally, that EVOO is a panacea of the entire cardiovascular system [4].Because of the time-consuming agronomical practices used for EVOO production, and the low production efficiencyfrequently lower than 20% as oil yield -the price of EVOO is high, especially compared with that of other vegetable oils. Consequently, EVOO is prone to adulteration with cheaper oils in order to increase profits. In addition to an economic burden, EVOO adulteration is detrimental if consumers react by buying other cooking fats or dressings, thinking that EVOO cannot be trusted. The negative implications on consumer confidence are even worse than the economic ones. Lastly, EVOO protection measures also imply the product area conservation, as far as landscape, tourism, and job preservation are concerned.While the European Commission regulations are indicating the characteristics of olive oil types, and are suggesting the methods of analysis [5], a lot of research is currently carried out, in order to experiment innovative techniques for authenticating extra virgin olive oils and predicting potential frauds.Numerous methodologies exist for EVOO authentication, both for adulteration detection and quantification.

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Spectral detection technology of vegetable oil: Spectral analysis of porphyrins and terpenoids

Wang

Xin

Xiong

2021

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Innovative spectroscopy of liquids: a fiber optic supercontinuum source and an integrating sphere for scattering-free absorption measurements

Cited by 3 publications

References 18 publications

Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning

Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning

Diffuse-light absorption spectroscopy and chemometrics for discrimination and quantification of extra virgin olive oil adulterants

Spectral detection technology of vegetable oil: Spectral analysis of porphyrins and terpenoids

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