期刊
IEEE SENSORS JOURNAL
卷 18, 期 11, 页码 4351-4357出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2018.2824404
关键词
Intelligent packaging; oxygen sensing; optical sensor; luminescent membrane; smartphone; Android (TM) application
资金
- Spanish Ministry of Economics and Competivity [CTQ2016-78754-C2-1-R]
- Spanish Ministry of Education, Culture and Sport [FPU13/05032]
- European Union's Horizon Research and Innovation Program (Multisens) [706303]
- Talentia Postdoc Program
- European Union's Seventh Framework Program
- Marie Sklodowska-Curie actions (COFUND) [267226]
- Ministry of Economy, Innovation, Science and Employment of the Junta de Andalucia
- Marie Curie Actions (MSCA) [706303] Funding Source: Marie Curie Actions (MSCA)
Here, we present a technique for the determination of the gaseous oxygen concentration inside packed food. It is based on the use of a luminescent membrane sensitive to O-2 that is optically excited and read by a smartphone. The flash of the smartphone along with an optical filter is used as the light source for the optical stimulation of the membrane. The luminescence generated, which is quenched by the surrounding gaseous oxygen, is registered by the rear camera of the same device. The response parameter is defined by combining the registered intensities at two different wavelength ranges corresponding to the emission and the absorption peaks of the sensitive membrane. Thanks to this novel response parameter, the sensitivity is increased and, more importantly, the thermal dependence of the membrane is significantly reduced. This approach allows the use of a luminescent O-2-sensitive membrane for intelligent packaging with no need of any associated electronics for its excitation and reading. This means that an oxygen sensor is developed, where a luminescent compound acts as an indicator, therefore combining the advantages of both schemes, that is, the simplicity and reduced cost of indicators with the high sensitivity and accuracy of selective sensors.
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