Spectral Characterisation of Dairy Products Using Photon Time-of-Flight Spectroscopy

Nielsen, Ole-Kenneth; Subash, Arman Ahamed; Nielsen, Frederik Donbæk; Dahl, Anders Bjorholm; Skytte, Jacob Lercke; Andersson‐Engels, Stefan; Khoptyar, Dmitry

doi:10.1255/jnirs.1075

Cited by 17 publications

(16 citation statements)

References 38 publications

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“…From this, it is seen that the reduced scattering properties provide a clear distinction between the two products. Furthermore, it is seen that the values are in agreement with the approximate development derived from Lorenz-Mie theory and previously reported by Nielsen et al 5 The measurement precision of the fermented products is in general lower than the milk products. This is due to their deflation and slightly curved surface.…”

Section: Resultssupporting

confidence: 90%

“…Similar results have been reported for other measurement techniques. 5,24 Concerning the discrimination of the structural difference between milk and fermented milk products, the evaluated optical properties of the dairy samples are compared directly in Fig. 10.…”

Section: Resultsmentioning

confidence: 99%

“…3 The microstructure is formed from an aggregation of protein during the fermentation process. 4 It is known that reduced scattering properties, 5 scattering phase function 6 and the speckle characteristics [7][8][9] are affected by the microstructure. Inspection tools which quantify any of these effects may therefore reduce manufacturing costs and improve product quality.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Non-Invasive Assessment of Dairy Products Using Spatially Resolved Diffuse Reflectance Spectroscopy

et al. 2015

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The quality of a dairy product is largely determined by its microstructure which also affects its optical properties. Consequently, an assessment of the optical properties during production may be part of a feedback system for ensuring the quality of the production process. This paper presents a novel camerabased measurement technique that enables robust quantification of a wide range of reduced scattering coefficients and absorption coefficients. Measurements are based on hyperspectral images of diffuse reflectance in the wavelength range of 470 to 1020 nm. The optical properties of commercially available milk and yogurt products with three different levels of fat content are measured. These constitute a relevant range of products at a dairy plant. The measured reduced scattering properties of the samples are presented, and show a clear discrimination between levels of fat contents as well as fermentation. The presented measurement technique and method of analysis is thus suitable for a rapid, noncontact, and non-invasive inspection that can deduce physically interpretable properties.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non-Invasive Assessment of Dairy Products Using Spatially Resolved Diffuse Reflectance Spectroscopy

et al. 2015

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“…For this, intralipid/ink-based phantoms, measured using our photon-time-of flight spectrometer, were employed [30,31]. We compare the LKM evaluated optical properties from such measurements to those obtained by evaluations using previously evaluated white Monte-Carlo (WMC) [32] and diffusion model (DM) [21] algorithms.…”

Section: Introductionmentioning

confidence: 99%

Computationally effective solution of the inverse problem in time-of-flight spectroscopy

Kamran¹,

Abildgaard²,

Subash³

et al. 2015

Opt. Express

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Photon time-of-flight (PTOF) spectroscopy enables the estimation of absorption and reduced scattering coefficients of turbid media by measuring the propagation time of short light pulses through turbid medium. The present investigation provides a comparison of the assessed absorption and reduced scattering coefficients from PTOF measurements of intralipid 20% and India ink-based optical phantoms covering a wide range of optical properties relevant for biological tissues and dairy products. Three different models are used to obtain the optical properties by fitting to measured temporal profiles: the Liemert-Kienle model (LKM), the diffusion model (DM) and a white Monte-Carlo (WMC) simulation-based algorithm. For the infinite space geometry, a very good agreement is found between the LKM and WMC, while the results obtained by the DM differ, indicating that the LKM can provide accurate estimation of the optical parameters beyond the limits of the diffusion approximation in a computational effective and accurate manner. This result increases the potential range of applications for PTOF spectroscopy within industrial and biomedical applications.

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“…The FPSs (mass median diameter) used in the design were 91, 211, and 450 lm, respectively. 28 The average particle diameters of ibuprofen used in the design were 71, 95, and 154 lm, respectively, and the average concentration was varied at five levels; 16,18,20,22, and 24 (%w/w), respectively. Properties for different filler sizes and the manufacturing methods are presented in Table I.…”

Section: Methodsmentioning

confidence: 99%

Transmission Near-Infrared (NIR) and Photon Time-of-Flight (PTOF) Spectroscopy in a Comparative Analysis of Pharmaceuticals

Kamran

Abildgaard²,

Sparén

et al. 2015

Appl Spectrosc

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We present a comprehensive study of the application of photon time-of-flight spectroscopy (PTOFS) in the wavelength range 1050-1350 nm as a spectroscopic technique for the evaluation of the chemical composition and structural properties of pharmaceutical tablets. PTOFS is compared to transmission near-infrared spectroscopy (NIRS). In contrast to transmission NIRS, PTOFS is capable of directly and independently determining the absorption and reduced scattering coefficients of the medium. Chemometric models were built on the evaluated absorption spectra for predicting tablet drug concentration. Results are compared to corresponding predictions built on transmission NIRS measurements. The predictive ability of PTOFS and transmission NIRS is comparable when models are based on uniformly distributed tablet sets. For non-uniform distribution of tablets based on particle sizes, the prediction ability of PTOFS is better than that of transmission NIRS. Analysis of reduced scattering spectra shows that PTOFS is able to characterize tablet microstructure and manufacturing process parameters. In contrast to the chemometric pseudovariables provided by transmission NIRS, PTOFS provides physically meaningful quantities such as scattering strength and slope of particle size. The ability of PTOFS to quantify the reduced scattering spectra, together with its robustness in predicting drug content, makes it suitable for such evaluations in the pharmaceutical industry.

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Spectral Characterisation of Dairy Products Using Photon Time-of-Flight Spectroscopy

Cited by 17 publications

References 38 publications

Non-Invasive Assessment of Dairy Products Using Spatially Resolved Diffuse Reflectance Spectroscopy

Non-Invasive Assessment of Dairy Products Using Spatially Resolved Diffuse Reflectance Spectroscopy

Computationally effective solution of the inverse problem in time-of-flight spectroscopy

Transmission Near-Infrared (NIR) and Photon Time-of-Flight (PTOF) Spectroscopy in a Comparative Analysis of Pharmaceuticals

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