Food monitoring based on diode laser gas spectroscopy

Lewander, Märta; Guan, Zuguang; Persson, Linda; Olsson, Annika; Svanberg, Sune

doi:10.1007/s00340-008-3192-2

Cited by 58 publications

(29 citation statements)

References 13 publications

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“…There have also been feasibility studies to find out if it is possible to monitor the oxygen concentration in the lungs of premature neonates, with positive outcome [6]. Non-intrusive measurements of food packages constitute another application that has been studied [7]. A review for the GASMAS technique can be found in [8].…”

Section: Introductionmentioning

confidence: 99%

Laser spectroscopy of gas confined in nanoporous materials

Svensson

Shen

2010

Applied Physics Letters

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We show that high-resolution laser spectroscopy can probe surface interactions of gas confined in nano-cavities of porous materials. We report on strong line broadening and unfamiliar lineshapes due to tight confinement, as well as signal enhancement due to multiple photon scattering. This new domain of laser spectroscopy constitute a challenge for the theory of collisions and spectroscopic lineshapes, and open for new ways of analyzing porous materials and processes taking place therein.Comment: 4 pages, 3 figures, partly presented orally at 7th International Conference on Tunable Diode Laser Spectroscopy (TDLS), July 2009 in Zermatt, Switzerland; Accepted for Applied Physics Letters (December 2009

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Section: Introductionmentioning

confidence: 99%

Laser spectroscopy of gas confined in nanoporous materials

Svensson

Shen

2010

Applied Physics Letters

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“…The presence and exchange of gases enclosed in scattering media can be assessed by using tunable diode lasers in combination with the gas in scattering media absorption spectroscopy (GASMAS) technique [2]. During recent years, GASMAS has been successfully developed and applied in various fields, e.g., medical diagnostics [3], the monitoring of wood-drying processes [4], pharmaceutical analysis [5], and food science [6,7]. As given by the Beer-Lambert law, the absorption signal of a gas depends on its concentration as well as the path length that the light has travelled.…”

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confidence: 99%

Gas spectroscopy and optical path-length assessment in scattering media using a frequency-modulated continuous-wave diode laser

et al. 2011

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“…The application of this technique is of considerable interest in several environmental, biological and medical processes. [12][13][14] Recently, it has been demonstrated that GASMAS is a powerful tool for studying food packaging 15,16 as well as the gas exchange in porous fruits such as apples. 17,18 Materials and Methods…”

Section: Introductionmentioning

confidence: 99%

Gas in Scattering Media Absorption Spectroscopy (GASMAS) Detected Persistent Vacuum in Apple Tissue After Vacuum Impregnation

et al. 2011

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The microstructure and the capillary pressure of the pore space are important variables for better understanding of the complex phenomena occurring during vacuum impregnation (VI) of plant tissues. In this study, we used GASMAS (Gas in Scattering Media Absorption Spectroscopy) of oxygen to, non-destructively, measure the dynamics of the internal pressure in apple pieces after restoration of the atmospheric pressure. Apple pieces were impregnated with isotonic sucrose solution (18% w/v) at different reduced pressures (15, 30, 45 kPa (abs.)). After restoration of the atmospheric pressure, the pressure of the remaining pore space gas could remain as low as 50 kPa (abs) and rise slowly toward ambient over a time scale of hours. Both the residual vacuum and the timescale of pressure equilibration with ambient varied with applied vacuum level and apple variety. It is proposed that at least a part of the pore space of apples may be hydrophobic, giving rise to a negative Laplace pressure, and thus the convective flow of impregnating solution is arrested at a mechanical equilibrium where internal pressure is lower than external pressure. Further pressure equilibration can then only be achieved either by gas diffusion in gas phase, or by gradual wetting of the pores.

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Food monitoring based on diode laser gas spectroscopy

Cited by 58 publications

References 13 publications

Laser spectroscopy of gas confined in nanoporous materials

Laser spectroscopy of gas confined in nanoporous materials

Gas spectroscopy and optical path-length assessment in scattering media using a frequency-modulated continuous-wave diode laser

Gas in Scattering Media Absorption Spectroscopy (GASMAS) Detected Persistent Vacuum in Apple Tissue After Vacuum Impregnation

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