TY  - JOUR
A1  - Adebayo, Segun Emmanuel
A1  - Hashim, Norhashila
A1  - Hass, Roland
A1  - Reich, Oliver
A1  - Regen, Christian
A1  - Münzberg, Marvin
A1  - Abdan, Khalina
A1  - Hanafi, Marsyita
A1  - Zude-Sasse, Manuela
T1  - Using absorption and reduced scattering coefficients for non-destructive analyses of fruit flesh firmness and soluble solids content in pear
JF  - Postharvest Biology and Technology
N2  - Quality attributes of fruit determine its acceptability by the retailer and consumer. The objective of this work was to investigate the potential of absorption (μa) and reduced scattering (μs’) coefficients of European pear to analyze its fruit flesh firmness and soluble solids content (SSC). The absolute reference values, μa* (cm−1) and μs’* (cm−1), of pear were invasively measured, employing multi-spectral photon density wave (PDW) spectroscopy at preselected wavelengths of 515, 690, and 940 nm considering two batches of unripe and overripe fruit. On eight measuring dates during fruit development, μa and μs’ were analyzed non-destructively by means of laser light backscattering imaging (LLBI) at similar wavelengths of 532, 660, and 830 nm by means of fitting according to Farrell’s diffusion theory, using fix reference values of either μa* or μs’*. Both, the μa* and the μa as well as μs’* and μs’ showed similar trends. Considering the non-destructively measured data during fruit development, μa at 660 nm decreased 91 till 141 days after full bloom (dafb) from 1.49 cm−1 to 0.74 cm−1 due to chlorophyll degradation. At 830 nm, μa only slightly decreased from 0.41 cm−1 to 0.35 cm−1. The μs’ at all wavelengths revealed a decreasing trend as the fruit developed. The difference measured at 532 nm was most pronounced decreasing from 24 cm−1 to 10 cm−1, while at 660 nm and 830 nm values decreased from 15 cm−1 to 13 cm−1 and from 10 cm−1 to 8 cm−1, respectively. When building calibration models with partial least-squares regression analysis on the optical properties for non-destructive analysis of the fruit SSC, μa at 532 nm and 830 nm resulted in a correlation coefficient of R = 0.66, however, showing high measuring uncertainty. The combination of all three wavelengths gave an enhanced, encouraging R = 0.89 for firmness analysis using μs’ in the freshly picked fruit.
KW  - Absorption
KW  - Non-destructive
KW  - Pear
KW  - Quality
KW  - Scattering
Y1  - 2017
U6  - https://doi.org/10.1016/j.postharvbio.2017.04.004
SN  - 0925-5214
SN  - 1873-2356
VL  - 130
SP  - 56
EP  - 63
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - GEN
A1  - Löhmannsröben, Hans-Gerd
A1  - Kantor, Zoltan
A1  - Kumke, Michael Uwe
A1  - Schmälzlin, Elmar
A1  - Reich, Oliver
T1  - OPQS – optische Prozess- und Qualitäts-Sensorik
N2  - Im vorliegenden Beitrag wird an Hand dreier Beispiele der Einsatz von optischer Sensorik zur Produktcharakterisierung dargestellt, nämlich Untersuchungen zum O2-Gehalt in Fruchtsäften, zur Isotopiesignatur von CO2 in Mineralwässern und zu Lichtstreueigenschaften eines Sonnenschutzmittels. Inhalt: Bestimmung von O2 mit Lumineszenzsonden Isotopenselektive Bestimmung von CO2 mit TDLAS Optische Charakterisierung stark streuender Materialien mit Photonendichtewellen
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 028 
KW  - Sensorik
KW  - Prozesskontrolle
KW  - Absorption
KW  - Lumineszenz
KW  - Lichtstreuung
KW  - Isotopie
Y1  - 2005
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-13205
ER  -