A Miniature In-Chamber Co2 and H20 Sensor for PhotosynthesisStudies

PI将开发和测试一种微型开放式CO2和H20 （MICAH）传感器，可以插入到叶片室的一个 工厂气体交换系统或用于涡流协方差测量 冠层光合作用和蒸腾作用。 MICAH传感器 将在空间动力学实验室开发， 技术人员最近交付了类似的传感器， 美国宇航局用于太空服。 该设计将提供低- 维护，电池供电的传感器连接到开放侧 使用红外传输光纤的吸收池。 创新的微型元件和微处理器控制将 提供高分辨率性能的手持式、灵活的 仪器 该传感器是植物生长技术的重要进步 气体交换，因为它将允许精确测量非 稳态光合作用 这种类型的测量是 研究植物对日照的反应是必要的， 受到现有仪器设计的限制。 因为 传感器将允许分析叶片中的CO2浓度 它还将允许开发一个真正的 CO2孔隙度计，这将提高速度，准确性， 现场气体交换系统的便携性。 随着这种传感器的成功开发，成本- 与NSF共享安排，使其副本可用于 科学家们的研究受到当前传感器技术的限制 威尔提议。

The PIs will develop and test a miniature open-cell CO2 and H20 (MICAH) sensor that can be inserted into the leaf chamber of a plant gas exchange system or used in eddy-covariance measurements of canopy photosynthesis and transpiration. The MICAH sensor will be developed at the Space Dynamics Laboratory by the technical personnel that recently delivered similar sensors to NASA for use in space suits. This design will provide low- maintenance, battery-powered sensors connected to open-sided absorption cells using infrared transmitting fiber optics. Innovative miniature components and microprocessor control will provide high-resolution performance in a hand-held, flexible instrument. This sensor is an important improvement in technology for plant gas exchange because it will allow accurate measurements of non- steady-state photosynthesis. Measurements of this type are necessary in the study of plant responses to sunflecks, and have been limited by the design of current instruments. Because the sensor will allow analysis of CO2 concentration in the leaf chamber directly, it will also allow the development of a true CO2 porometer, which will improve the speed, accuracy, and portability of field gas exchange systems. Following the successful development of this sensor, a cost- sharing arrangement with NSF to make copies of it available to scientists whose research is limited by current sensor technology will proposed.