IMEC the Netherlands, OnePlanet Research Center, Bronland 10A, 6708 WH Wageningen, The Netherlands.
Sensors (Basel). 2024 Sep 30;24(19):6336. doi: 10.3390/s24196336.
A minimally invasive needle refractometer is presented for sugar content measurements within produce. A passive sampling cap structure was developed that improves the reliability of the device by avoiding interfering back reflections from the flesh of the produce. It is explained that factory calibration may not be needed for this type of refractometer, potentially reducing production costs. Also demonstrated is an iterative method to correct for temperature variations without the need for an integrated model for how the refractive index changes with temperature for different levels of sugar concentration. The sensor showed a typical standard deviation of 0.4 °Bx for a 10-s-long measurement and was validated against a prism refractometer, showing an average offset of (0.0±0.1) °Bx. In addition, the potential for using the device to investigate sugar distributions within a single fruit sample is demonstrated.
一种用于农产品内部糖含量测量的微创针式折射仪被提出。一种被动采样帽结构被开发出来，通过避免来自农产品果肉的干扰反向反射，提高了设备的可靠性。文中解释说，对于这种折射仪，可能不需要工厂校准，从而降低了生产成本。此外，还展示了一种迭代方法来校正温度变化，而无需集成模型来描述折射率随不同糖浓度的温度变化。该传感器在 10 秒的测量时长下，典型的标准偏差为 0.4 °Bx，并与棱镜折射仪进行了验证，平均偏差为（0.0±0.1）°Bx。此外，还展示了该设备用于研究单个水果样本内部糖分布的潜力。
