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Development of hand-held nondestructive detection device for assessing meat freshness

机译：开发用于评估肉类新鲜度的手持式无损检测装置

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Meat freshness is directly related to the health of consumers, and total volatile basic nitrogen (TVB-N) content is an important reference index for evaluating pork freshness. This paper attempted to measure TVB-N content for assessing pork meat freshness using a new self-developed portable and low cost detection device designed by ourselves basing on near infrared technique. The front-end part of this device was an integrated detection component containing a mini probe which was about 5cm in diameter circle. In the signal acquiring component, silicon photodiode detector was embedded in the center of light source in probe and spectral response range was 400-1100nm to receive diffuse light from pork meat surface in mini probe. The main circuits in this device included stabilized current supply circuit which was used to provide a stable power supply for each LED light source in probe and signal processing circuit which was utilized to complete signal amplification and A/D conversion, In addition, another vital function of the signal processing circuit was to analysis detection signals from mini probe in the detection component. For verifying this device performance, 58 pork samples with different freshness attributes and Multiple Linear Regression (MLR) mathematical method and ratio data processing algorithm were employed to build pork TVB-N content prediction model, and comparing with results from raw data model, the correlation coefficient of prediction and validation of TVB-N were 0.8027 and 0.7291 respectively, and the accuracy of predicting pork freshness was about 78.6%. This work demonstrates that it has the potential in nondestructive detection of TVB-N content in pork meat using this device, which can simplify related instruments design structure and reduce their development cost in future.
机译：肉的新鲜度与消费者的健康直接相关，总挥发性碱性氮（TVB-N）含量是评估猪肉新鲜度的重要参考指标。本文尝试使用自行研发的新型便携式，低成本检测装置，基于近红外技术测量TVB-N含量，以评估猪肉的新鲜度。该设备的前端部分是一个集成的检测组件，其中包含一个直径约5厘米的微型探针。在信号采集组件中，将硅光电二极管检测器嵌入探头的光源中心，光谱响应范围为400-1100nm，以接收来自微型探头中猪肉表面的漫射光。该设备的主要电路包括稳定电流供应电路和信号处理电路，稳定电流供应电路用于为探针中的每个LED光源提供稳定的电源，信号处理电路用于完成信号放大和A / D转换。此外，另一个重要功能信号处理电路的原理是分析检测组件中微型探头的检测信号。为了验证该设备的性能，采用58种具有不同新鲜度属性的猪肉样品以及多元线性回归（MLR）数学方法和比率数据处理算法来构建猪肉TVB-N含量预测模型，并将其与原始数据模型的结果进行比较，相关性TVB-N的预测系数和验证系数分别为0.8027和0.7291，预测猪肉新鲜度的准确性约为78.6％。这项工作表明，它具有使用该设备无损检测猪肉中TVB-N含量的潜力，可以简化相关仪器的设计结构并降低其未来的开发成本。

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