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，测量参数包括植物的光量子产额Y(II)及相对电子传递速率ETR，最大光化学效率Fv/Fm，同时还可测量PAR、叶温、相对湿度和叶片吸光率等环境参数。
特点
叶片吸光率测量：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：用于暗适应测量。
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，*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，确保可以测得准确的Fm’ 。
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、Fm’、Fo、Fs，消除饱和脉冲NPQ的影响和电子噪音。
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，Fv/Fm测量仪及10个暗适应叶夹，2个电池，2个充电器，一个便携箱，文件U盘。
技术指标
测量参数：
Y(II)或ΔF/Fm‘、ETR、PAR、Tleaf、相对湿度、Fms或Fm’、Fs、α(叶片吸收率)、FV/FM、FV/FO，FO, FM, FV。
监测模式：允许长时间监测
技术参数：
Y(II): 光适应测量, 稳态光合作用下的环境光
光源
饱和脉冲： LED白光源，使用PAR叶夹时可达7000μmols
调制光：红光，LED 660nm，具有690nm窄通过滤器。
光化光源：环境光
检测方法：脉冲调制法
PAR：测量400-700nm，余弦校正 ±2umols
Fv/Fm：暗适应测量
光源：LED红光饱和光闪，可达6000umols；
调制光：660nmLED 红光，690nm滤波器
调制光可以根据实际测量自动调节到合适的强度，减少手动调节误差，
相对湿度：0%~100%，±2%。
检测器&过滤器：具有700~750nm带通过滤的PIN光电二极管
可选配三脚架。
显示：132 X 30 pixel 液晶显示屏
取样速率：1~10000点/秒自动切换。
测量时间：最短3s或也可设置长期监测模式
存储空间：2GB
输出：USB下载数据，用Excel查看，无需安装其他专用软件
供电：USB锂离子电池(普通充电宝)，可用8小时
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.
加便携箱和附件总重1.95 kg.
工作温度：0℃ ~ 50℃
产地
美国
文献
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