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Relationship between amplitude and phase measurements of photoacoustic signal in the infrared region and water concentration in condensed milk

Published online by Cambridge University Press:  01 June 2009

Richard Martel ,
Paul Paquin  and
Lionel Bertrand
Richard Martel
Affiliation:
Département de Sciences et Technologie des Aliments, Centre de Recherche STELA, Université Laval, Québec, CanadaG1K 7P4
Paul Paquin
Affiliation:
Département de Sciences et Technologie des Aliments, Centre de Recherche STELA, Université Laval, Québec, CanadaG1K 7P4
Lionel Bertrand
Affiliation:
Departement de Génie Physique, Ecole Polytechnique de Montréal, Montréal, CanadaH3C 3A7
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Summary

Photoacoustic signals in the near infrared region (~ 2·75 μm) have been investigated using amplitude and phase information to determine their effectiveness in estimating the water content of milk. The results obtained showed a good correlation between the photoacoustic signal and water concentration (R2 = 0·98) even though photoacoustic saturation was present in the range of wavelengths studied. However, this is not recommended as a fast technique for water determination because of inherent phase fluctuations in the samples analysed.

Type
Original Articles
Information
Journal of Dairy Research , Volume 57 , Issue 3 , August 1990 , pp. 393 - 400
Copyright
Copyright © Proprietors of Journal of Dairy Research 1990

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References

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