Spectroscopy Since 1975

Articles

Near infrared spectroscopy: the practical chemical imaging solution

Frederick W. Koehler IV, Eunah Lee, E. Neil Lewis

Chemical imaging spectroscopy is an exciting new analytical advance that answers commonly asked questions such as what chemical species are in a sample, how much of each is present, and most importantly, where are they located? Through the fusion of traditional infrared spectroscopy with powerful microscopic and macroscopic imaging capabilities, chemical imaging spectroscopy answers all these questions simultaneously, in a single rapid measurement.

Article  |  Issue 14/3 (2002)

Sorting the wheat from the chaff

Tony M.C. Davies, Tom Fearn

Tony M.C. Davies

Norwich Near Infrared Consultancy, 75 Intwood Road, Cringleford, Norwich NR4 6AA,UK

Tom Fearn

Department of Statistical Science, University College London, Gower Street, London

Tony Davies Column  |  Issue 14/2 (2002)

Wavelength selection and probe design for the customisation of micro-spectrometers

A.N.Davies, H.M. Heise, P. Lampen, R.H. Kurte, L. Küpper

A.N.Davies, H.M. Heise, P. Lampen, R.H. Kurte and L. Küpper

ISAS, Institute of Spectrochemistry and Applied Spectroscopy, Bunsen-Kirchhoff-Str. 11, Postfach 10 13 52, 44013 Dortmund, Germany

Tony Davies Column  |  Issue 13/3 (2001)

Uncertainty testing in PLS regression

A.M.C. Davies

A.M.C. Davies

Norwich Near Infrared Consultancy, 75 Intwood Road, Cringleford, Norwich, NR4 6AA, UK

Tony Davies Column  |  Issue 13/2 (2001)

Changing scales with Fourier transformation [Lesson 3 of matrix algebra (matrix multiplication)]

A.M.C. Davies, Tom Fearn

In the last column, we showed how we could perform Fourier transformation (FT) of a near-infrared (NIR) spectrum in a few lines of matrix algebra and said that in this column we would use it in a novel way. The task we are going to perform is that of changing scales of spectroscopic (NIR) data. This may be novel, we are not aware that anyone else does it this way, but of course instrument manufacturers sometimes like to be silent about the methods they employ.

Tony Davies Column  |  Issue 12/6 (2000)

The TDeious way of doing Fourier transformation (Lesson 2 of matrix algebra)

A.M.C. Davies, Tom Fearn

At the end of the last column we promised that this time we would show how matrix algebra can be used for real computational tasks. The chosen task is Fourier transformation (FT) of a near infrared (NIR) spectrum. Those who know Tony Davies will not be surprised at this choice of subject but in the third lesson the reason for wanting to do the obvious will become apparent.

Tony Davies Column  |  Issue 12/4 (2000)

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