Abstract The present study proposes the design of a portable noninvasive optical sensor consisting of fluorescence-based sensing membrane for the purpose of evaluating the freshness of various consumable meats by measuring the dual parameters of oxygen and carbon dioxide. The sensor film is attached to the inner wall of an air-tight container integrated with opto-electronics circuits. The performance characteristics of the sensor, such as the photo-stability, response time, and cross-sensitivity, were characterized to demonstrate the effectiveness of sensing before testing actual samples. The fluorescent sensor reacts rapidly with an increase in CO2 ranging from 700 to 3800 ppm and a decrease of oxygen between 7.5 and 7 ppm observed in a period of 8 h. The sensor shows the maximum and minimum relative error of +3.80% and –2.24% for CO2 and +2.39% and –4.34% for O2, respectively. The accuracy of the developed sensor was ±1.75% with high precision of 5000 ± 28.2 and 7 ± 0.04 ppm for CO2 and O2, respectively, which implies low standard deviation values. The results were comparable with a reference instrument. This simple, yet nondestructive and inexpensive system analyzes the quality of meat at domiciliary levels.

中文翻译：

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用荧光膜光学测定二氧化碳和氧气来评价肉制品的新鲜度

摘要 本研究提出了一种由荧光传感膜组成的便携式无创光学传感器的设计，目的是通过测量氧气和二氧化碳的双重参数来评估各种食用肉类的新鲜度。传感器薄膜贴在与光电电路集成的气密容器的内壁上。传感器的性能特征，如光稳定性、响应时间和交叉敏感性，在测试实际样品之前进行了表征，以证明传感的有效性。在 8 小时内观察到的 CO2 增加范围从 700 到 3800 ppm，氧气减少 7.5 到 7 ppm，荧光传感器会迅速做出反应。传感器显示 CO2 和 +2 的最大和最小相对误差为 +3.80% 和 –2.24%。O2 分别为 39% 和 –4.34%。开发的传感器的精度为 ±1.75%，CO2 和 O2 的精度分别为 5000 ± 28.2 和 7 ± 0.04 ppm，这意味着低标准偏差值。结果与参考仪器相当。这个简单但无损且廉价的系统可以分析家庭级别的肉类质量。