• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>農業気象 >Estimation of supplemental lighting efficiency based on PPFD distribution on the canopy surface
【24h】

Estimation of supplemental lighting efficiency based on PPFD distribution on the canopy surface

机译：基于冠层表面上的PPFD分布的补充照明效率估计

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Criteria for evaluation of the efficiency of supplemental lighting based on photosynthetic photon flux density (PPFD) distribution on a canopy surface under artificial light were proposed, and the possibility of a reflection-image-based estimation ofPPFD distribution on the canopy surface was discussed. Reflection images of plant canopy surfaces under various artificial lighting conditions were acquired from three directions with a digital camera equipped with a blue-green band-pass filter. PPFD wasmeasured at one point on the canopy by a quantum sensor simultaneously with imaging, and the result was used to determine a regression model to estimate PPFD on leaves from pixel values of the image. The histogram of pixel values after gamma correctionwas converted into a PPFD histogram. The histogram pattern depended on the light source and canopy structure. Histograms estimated from images could depict the differences, showing mean values and coefficients of variation (CV) close to the measured values. Integrated PPFD over all illuminated leaves per unit power consumption (IPPC) was calculated from the histogram as a criterion for evaluating the efficiency of supplemental lighting. The efficiency also depended on the light source, canopy structure,and distance from the canopy surface. The estimated efficiency approximately agreed with the measured value in each case. These results suggest that reflection-image-based estimation of light intensity distribution can be used for simple evaluation of the efficiency of supplemental lighting.
机译：提出了一种基于人工光在冠层表面的光合光子通量密度（PPFD）分布评估辅助照明效率的标准，并讨论了基于反射图像估算冠层表面PPFD分布的可能性。使用配备了蓝绿色带通滤波器的数码相机，从三个方向获取了在各种人工照明条件下植物冠层表面的反射图像。在成像的同时，通过量子传感器在冠层的一点上测量PPFD，并将结果用于确定回归模型，以从图像的像素值估计叶片上的PPFD。将经过伽玛校正后的像素值直方图转换为PPFD直方图。直方图图案取决于光源和顶篷结构。从图像估计的直方图可以描绘差异，显示平均值和接近测量值的变异系数（CV）。根据直方图计算出每单位耗电量（IPPC）上所有照亮叶片的积分PPFD，作为评估补充照明效率的标准。效率还取决于光源，顶篷结构以及与顶篷表面的距离。在每种情况下，估计效率大约与测量值一致。这些结果表明，基于光强度分布的基于反射图像的估计可用于简单评估辅助照明的效率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号