Laboratory for the Design of Microsystems, Department of Microsystems Engineering-IMTEK, University of Freiburg, 79110 Freiburg im Breisgau, Germany.
Sensors (Basel). 2021 May 13;21(10):3390. doi: 10.3390/s21103390.
We propose a novel approach to measure photosynthetically active radiation (PAR ) in the form of photosynthetic photon flux density with an inexpensive, small multi-channel spectrometer sensor, with integrated optical filters and analog-to-digital converter. Our experiments prove that the combination of eight spectral channels with different optical sensitivities, such as the sensorchip in use (AS7341, ams), derive the PAR with an accuracy of 14/m2/s. Enabled by the sensor architecture, additional information about the light quality can be retrieved which is expressed in the RLQI. A calibration method is proposed, and exemplary measurements are performed. Moreover, the integration in a solar-powered wireless sensor node is outlined, which enables long-term field experiments with high sensor densities and may be used to obtain important indexes, such as the GPP.
我们提出了一种新颖的方法，通过使用廉价、小巧的多通道分光光度计传感器，结合集成光学滤波器和模数转换器，以光合光子通量密度的形式来测量光合有效辐射 (PAR)。我们的实验证明，使用具有不同光学灵敏度的八个光谱通道（例如正在使用的传感器芯片 AS7341，ams）相结合，可以以 14/m2/s 的精度得出 PAR。借助传感器架构，可以获取以 RLQI 表示的有关光质的其他信息。我们提出了一种校准方法，并进行了示例测量。此外，还概述了将其集成到太阳能供电的无线传感器节点中，这使得可以进行具有高传感器密度的长期现场实验，并可用于获取重要指标，例如 GPP。
