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Calibration transfer from dispersive instrument to handheld Polychromix Phazir 1624


  • Vermeulen, P. , Lecler, B. , Dardenne, P. , Piotrowski, C. , Baeten, V. & Fernández Pierna, J.A. (2009). Calibration transfer from dispersive instrument to handheld Polychromix Phazir 1624. Poster in: 14th International Conference on Near Infrared Spectroscopy (ICNIRS): Breaking the dawn, Bangkok - Thailand, 7-13 November 2009.
Type Poster
Year 2009
Title Calibration transfer from dispersive instrument to handheld Polychromix Phazir 1624
Event name 14th International Conference on Near Infrared Spectroscopy (ICNIRS): Breaking the dawn
Event location Bangkok - Thailand
Label U15-1495
Recnumber 617
Event date 7-13 November 2009
Endnote Keywords MEMS|calibration transfer|handheld spectrometer|cereals|
Abstract [Introduction] Dispersive monochromators have been widely used over the last 25 years to build large data sets in agriculture. On the other hand, new handheld instruments based on the MEMS (Micro Electro Mechanical System) technology are an attractive solution for on-site analysis in the food and feed sectors. The objective of this study carried out in collaboration with AUNIR Company (http://www.aunir.co.uk/) is to assess the potentiality of a calibration transfer from a Foss NIRSystem 5000 to a Polychromix Phazir 1624 instrument. The Polychromix Phazir 1624 is an handheld near-infrared (NIR) spectrometer active in the 1600 - 2400 nm range. It combines a DTS (digital transform spectrometer) engine, a reflectance probe, rechargeable batteries, integrated computer and LCD display and software into one unit that can be used remotely, such as in field or industrial applications. [Materials and Methods] A dataset of 7930 spectra of cereal flour has been analyzed for several years by AUNIR and CRA-W using a Foss NIRSystem 5000. PLS calibration models have been developed using reference values for the 5 properties selected for this study: moisture, water absorption, starch damage, protein and ash content. In order to transfer these equations from the dispersive instrument (slave) to the handheld spectrometer (master), 40 flour samples were measured with both instruments and analyzed with reference methods for the 5 criteria. Because the Polychromix Phazir 1624 instrument is working in the range of 1600-2400 nm with a non constant step, the first important modification is the interpolation of the 700 wavelengths (1100-2498 nm with a constant step of 2 nm) of the Foss NIRSystem 5000 instrument to the 100 wavelength of the Polychromix Phazir 1624 instrument. After check of the interpolation performance, 7 outliers were removed. The 33 remaining samples were used for the standardization of the instruments. The second modification is the correction performed on the 33 Foss spectra by adding at each wavelength the difference between the value of the mean spectra of the standardization set measured with the Polychromix Phazir 1624 instrument and the mean spectra of the same file measured with the Foss NIRSystem 5000 instrument. This interpolation and bias correction were also applied to the large Foss database. This data treatment was carried out under Matlab 7.5.0 (R2007b). PLS models were built with PhazirMG v 1.63 software based on corrected spectra of the Foss database and the standardisation set. [Results and Discussion] The achieved results show that calibration models for different properties of cereal flour developed on a Foss NIRSystem 5000 have been successfully transferred to a Polychromix Phazir 1624 handheld spectrometer. The poster shows the calibration and validation results.
Fichier Calibration transfer from dispersive instrument to handheld Polychromix Phazir 1624
Caption U15-1495-vermeulen-2009.pdf
Authors Vermeulen, P. , Lecler, B. , Dardenne, P. , Piotrowski, C. , Baeten, V. & Fernández Pierna, J.A.