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Spectrophotometer ageing and prediction of fruit attributes
journal contribution
posted on 2018-05-11, 00:00 authored by Umesh AcharyaUmesh Acharya, Kerry WalshKerry Walsh, Clinton HayesClinton Hayes, Phul SubediPhul SubediDeterioration of lamp output quality over time and degradation of detector signal to noise ratio are issues associated with ageing of a spectrophotometer. To document the effect of instrument ageing on short wavelength near infrared spectroscopy-based assessment of internal attributes of fruit quality prediction (total soluble solids, TSS, of juice), an assessment was conducted of several handheld PDA based spectrophotometers over several years, with repeated spectra of a reference Teflon (PFTE) tile and spectra of 20 apple fruit acquired at yearly intervals. The repeatability of each instrument was assessed as the standard deviation of absorbance of repeated measures of a reference, typically around 0.2mAbs. Instrument changes were identified in performance and in principal components analysis plots, but performance (apple TSS model) was not related to instrument repeatability. A piecewise direct standardisation method is recommended to maintain a multivariate calibration model across spectrometers.
Funding
Category 3 - Industry and Other Research Income
History
Volume
24Issue
4Start Page
337End Page
344Number of Pages
8eISSN
1751-6552ISSN
0967-0335Publisher
Journal of Near Infrared SpectroscopyPublisher DOI
Full Text URL
Peer Reviewed
- Yes
Open Access
- No
Era Eligible
- Yes