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Nanoporous polymeric transmission gratings for high-speed humidity sensing

机译：用于高速湿度传感的纳米多孔聚合物透射光栅

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Nanoporous polymeric transmission gratings are demonstrated to be an excellent platform for high-speed optical humidity sensing. The grating structures were fabricated with a modified holographic, polymer-dispersed liquid crystal (H-PDLC) system. The sensing mechanism was based on changes in the relative transmission associated with the adsorption and desorption of water vapour by nanopores. The spectral changes due to varying humidity levels were measured by a spectrometer and compared with the calculated results based on the coupled wave theory. When the relative humidity (RH) changed from 40 percent to 95 percent, the relative transmission at 475 nm increased from 6.3 percent to 46.6 percent and that at 702 nm increased from 4 percent to 64 percent; these results indicate the sensor's high sensitivity. In addition, the sensor demonstrated excellent reversibility and reproducibility over a large RH range (from 20 percent to 100 percent RH). Moreover, the response time of the sensor was measured to be less than 350 ms, making it suitable for many high-speed humidity-sensing applications.
机译：纳米多孔聚合物透射光栅被证明是用于高速光学湿度感测的出色平台。光栅结构是用改良的全息，聚合物分散液晶（H-PDLC）系统制造的。传感机制是基于与纳米孔对水蒸气的吸附和解吸有关的相对透射率的变化。通过光谱仪测量由于湿度水平变化而引起的光谱变化，并将其与基于耦合波理论的计算结果进行比较。当相对湿度（RH）从40％变为95％时，475 nm处的相对透射率从6.3％增加到46.6％，而702 nm处的相对透射率则从4％增加到64％。这些结果表明传感器具有很高的灵敏度。此外，该传感器在较大的相对湿度范围（相对湿度从20％到100％）上显示出优异的可逆性和可重复性。此外，该传感器的响应时间测得小于350毫秒，使其适用于许多高速湿度传感应用。

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