Non-intrusive headspace gas measurements by laser spectroscopy - Performance validation by a reference sensor

详细信息	查看全文 | 推荐本文 |

• 作者：Patrik Lundin^a ; ^{patrik.lundin@fysik.lth.se} ; Lorenzo Cocola^a ; ^b ; Mä ; rta Lewander^a ; ^c ; Annika Olsson^d ; Sune Svanberg^a
• 关键词：TDLAS ; Tunable diode laser absorption spectroscopy ; WMS ; Wavelength modulation spectroscopy ; GASMAS ; Gas in scattering media absorption spectroscopy ; PD ; Photo diode ; PMT ; Photo multiplying tube
• 刊名：Journal of Food Engineering
• 出版年：2012
• 期刊代码：67_02608774
• 类别：abs
• 出版时间：August, 2012
• 卷：111
• 期：4
• 页码：612-617
• 文件大小：524 K

摘要

The oxygen concentration in the headspace of a large number of liquid food containers is assessed with non-intrusive diode laser absorption spectroscopy. The results are compared to those given by a traditional intrusive measurement method. The upper portions of the containers are made of translucent but non-transparent plastic materials, through which the laser light is diffusively transmitted. Measurements are performed both on packages with modified atmosphere and with normal air conditions. It is concluded that the novel non-intrusive technique provides oxygen concentrations that generally differ by less than one percentage point from the reference sensor values.