Hakkel Kaylee D, Petruzzella Maurangelo, Ou Fang, van Klinken Anne, Pagliano Francesco, Liu Tianran, van Veldhoven Rene P J, Fiore Andrea
Department of Applied Physics and Eindhoven Hendrik Casimir Institute, Eindhoven University of Technology, PO Box 513, NL, 5600 MB, Eindhoven, The Netherlands.
Nat Commun. 2022 Jan 10;13(1):103. doi: 10.1038/s41467-021-27662-1.
Spectral sensing is increasingly used in applications ranging from industrial process monitoring to agriculture. Sensing is usually performed by measuring reflected or transmitted light with a spectrometer and processing the resulting spectra. However, realizing compact and mass-manufacturable spectrometers is a major challenge, particularly in the infrared spectral region where chemical information is most prominent. Here we propose a different approach to spectral sensing which dramatically simplifies the requirements on the hardware and allows the monolithic integration of the sensors. We use an array of resonant-cavity-enhanced photodetectors, each featuring a distinct spectral response in the 850-1700 nm wavelength range. We show that prediction models can be built directly using the responses of the photodetectors, despite the presence of multiple broad peaks, releasing the need for spectral reconstruction. The large etendue and responsivity allow us to demonstrate the application of an integrated near-infrared spectral sensor in relevant problems, namely milk and plastic sensing. Our results open the way to spectral sensors with minimal size, cost and complexity for industrial and consumer applications.
光谱传感在从工业过程监测到农业等各种应用中越来越受到广泛使用。传感通常是通过用光谱仪测量反射光或透射光并处理所得光谱来进行的。然而，实现紧凑且可大规模制造的光谱仪是一项重大挑战，尤其是在化学信息最为显著的红外光谱区域。在此，我们提出了一种不同的光谱传感方法，该方法极大地简化了对硬件的要求，并允许传感器进行单片集成。我们使用了一系列谐振腔增强型光电探测器，每个探测器在850 - 1700纳米波长范围内都具有独特的光谱响应。我们表明，尽管存在多个宽峰，但可以直接使用光电探测器的响应来建立预测模型，从而无需进行光谱重建。大的数值孔径和响应度使我们能够展示集成近红外光谱传感器在相关问题上的应用，即牛奶和塑料传感。我们的研究结果为工业和消费应用中尺寸、成本和复杂度最小的光谱传感器开辟了道路。
