Spectrum conversion film (SCF) is a covering material that modifies incident solar spectrum to more-active wavelengths in photosynthesis. Due to its fluorescence property, the performance of SCF cannot be accurately evaluated in a conventional way for agricultural films. We proposed quantitative methods to evaluate the conversion performance of SCF and tested the plant responses. The performance of GR films [green light (500–600 nm) to red light (600–700 nm)] containing different concentrations of dye (40–3000 ppm) was tested in comparison to a transparent film (control). A method for estimating light emission was developed using a series of equations and values measured under artificial lighting. The spectral properties and photosynthetic rates of sweet pepper (Capsicum annuum L.) leaves covered with the GR film were measured using a solar simulator. The emission of GR film was detected using a spectroradiometer connected to an integrating sphere instead of using a spectrophotometer used in the conventional method. The transmittance of GR film and its change rate of transmitted photon flux densities at emission wavelength differed depending on the light source. The change rate calculated through the equations was constant within the target spectrum and could be used as a basis for conversion performance. The solar spectrum modified by the GR film caused to increase the red light reaching the leaves by 10.47% and thereby increased the photosynthetic rates by 15.41% compared to the control. The photosynthetic efficiency based on incident and absorbed photons under the GR film increased by 22.14% and 21.87%, respectively. These methods were proposed for quantifying spectral properties of SCF under the solar spectrum, confirming the application of solar simulator for photosynthetic evaluation. When used as a standard light source for SCF, a solar simulator provides indoor test conditions with a spectrum similar to solar radiation without long-term cultivation or a large-scale film test.

中文翻译：

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在模拟太阳条件下评估光谱转换膜的转换性能和测试植物响应的定量方法

光谱转换膜 (SCF) 是一种覆盖材料，可将入射太阳光谱修改为光合作用中更活跃的波长。由于其荧光特性，SCF 的性能无法以农膜的常规方法进行准确评估。我们提出了定量方法来评估 SCF 的转化性能并测试植物响应。与透明薄膜（对照）相比，测试了含有不同浓度染料（40-3000 ppm）的 GR 薄膜 [绿光（500-600 nm）到红光（600-700 nm）] 的性能。使用一系列在人工照明下测量的方程和值开发了一种估计光发射的方法。甜椒（Capsicum annuum L.的光谱特性和光合速率）) 使用太阳模拟器测量覆盖有 GR 薄膜的叶子。使用连接到积分球的分光辐射计代替常规方法中使用的分光光度计检测 GR 膜的发射。GR薄膜的透射率及其在发射波长下透射光子通量密度的变化率因光源而异。通过方程计算的变化率在目标光谱内是恒定的，可用作转换性能的基础。与对照相比，GR 薄膜修饰的太阳光谱使到达叶子的红光增加了 10.47%，从而使光合速率增加了 15.41%。基于GR膜下入射光子和吸收光子的光合效率分别提高了22.14%和21.87%。提出了这些方法来量化太阳光谱下 SCF 的光谱特性，证实了太阳模拟器在光合作用评估中的应用。当用作 SCF 的标准光源时，太阳模拟器提供室内测试条件，其光谱类似于太阳辐射，无需长期培养或大规模薄膜测试。