澳作Y(II)光量子产额测量仪

应用
Y(II)或ΔF/FM’ 或 (FM’ – FS )/FM’) 是经受时间考验的光适应测量参数，比FV/FM对更多类型的植物胁迫更加敏感。已有的大量证据表明FV/FM对许多种植物胁迫和健康植物的光系统II的测量十分出色，而Y(II)或光量子产额则可测量实际光照下光适应环境和生理状况的光系统II的效率。
原理

采用调制饱和脉冲原理，测量植物的叶绿素荧光，通过相关文献的研究成果，计算植物的光量子产额及相对电子传递速率，同时可测量PAR、叶温、相对湿度等环境参数。
 
特点
叶片吸收测量：提供叶片吸收测量及随环境变化导致的叶片吸收变化。根据Eichelman (2004) 叶片吸收在健康植物的变化范围在0.7~0.9 之间。因此，为获得准确的ETR或“J”，Y(II)测量仪提供了一个可靠的测量方法，
FV/FM测量单元：可额外选配FV/FM测量仪，用于暗适应测量。
具有暗适应叶夹
阳光下屏幕可见
图形显示FV/FM曲线
2GB存储空间
USB通讯
数据Excel查看

先进的PAR叶夹：采用底部叶夹打开装置，防止测量时误操作打开叶夹。对传感器进行余弦校正，确保叶片相对测量光的角度不变。

 
FM’校正：对于具有高光照强度历史的植物，完全关闭光反应中心是一个问题，Y(II)测量仪使用Loriaux &Genty 2013的方法进行FM’校正，确保误差最小。
测量植物叶片的吸收：能够直接测量植物叶片的吸收，而不是使用平均值0.84计算ETR。
自动调制光设定：快速准确自动的调整合适的调制光强，避免人工操作的误差。
先进算法避免饱和脉冲NPQ：采用25ms内8点的平均值确定FM’，消除饱和脉冲NPQ的影响。
更精确的叶温测量：采用非接触式红外测量，测量精度可达±0.5℃。
直接测量相对湿度：含有测量气体交换使用的固态传感器，可测量相对湿度。
降低叶片遮挡的设计：倾斜的角度减少对叶片的遮挡，可以测量拟南芥等小叶。
 
系统组成

标配：
Y(II)光量子产额测量仪、充电器、USB电缆、便携箱、2个吸收测量单元、U盘（包含说明书）。
 
 
可选：
FV/FM测量仪及10个暗适应叶夹、三脚架。
 








技术指标
测量参数：
Y(II)或ΔF/Fm‘、ETR、PAR、T、FMS或FM’、Fs、α(叶片吸收&叶片透射)。
监测模式：可使用电脑，长时间监测Y(II)、ETR、叶片吸收、PAR、叶温、相对湿度、及NPQ。
相对湿度：5%~95%，±2%。
可使用AC或USB供电，可配三脚架。
技术参数：
光源
饱和脉冲：白色LED具有PAR时7000μmols
调制光：红色LED 660nm，具有690nm短波过滤。
光化光源：仅可使用外部光源
检测方法：调制脉冲法
检测器&过滤器：具有700~750nm带通过滤的PIN光电二极管
取样速率：1~10000点/秒自动切换。
测量时间：3s或长期监测
存储空间：2GB
输出：USB
尺寸：便携箱尺寸为14”x 11”x 6”，仪器为9’’长
质量：Y(II) 测量仪0.45 kg
FV/FM测量仪0.36 kg.
总重1.95 kg.
产地:美国

文献
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Eichelman H., Oja V., Rasulov B., Padu E., Bichele I., Pettai H., Niinemets O., Laisk A. (2004) Development of Leaf Photosynthetic Parameters in Betual pendula Roth Leaves: Correlation with Photosystem I Density, Plant Biology 6 (2004):307-318

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