Relationship between amplitude and phase measurements of photoacoustic signal in the infrared region and water concentration in condensed milk
1990 ◽
Vol 57
(3)
◽
pp. 393-400
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Keyword(s):
SummaryPhotoacoustic 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.