Wireless Miniature Dosimeters for In-Situ Radiation Measurement

用于原位辐射测量的无线微型剂量计

• 批准号: 0554664
• 负责人: Babak Ziaie
• 金额: $ 15.8万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0554664&HistoricalAwards=false
• 关键词: Wireless; Miniature; Dosimeters; Situ; Radiation

Intellectual Merit: This sensor proposal focuses on the development of a novel microtransponder for wireless in-situ radiation dosimetry. The proposed sensor is totally passive, i.e., do not require an on board power source, and thus avoid problems associated with radiation damage to active electronics (transistors, etc). The transponder is based on a novel device structure combining the quasi-permanent electric field produced by an electret with silicon micromachining. The micromachined LC dosimeter incorporates an array of cantilever beams deflected by the electric field produced by an electret. This array is connected to an on-chip spiral coil, thereby forming a passive LC resonant circuit. Upon exposure to the ionizing radiation, the surface charge of the electret is reduced hence decreasing the force on the cantilever beams (and therefore decreasing their deflection). This decreases the capacitance between the beams and the bottom electrode of the electret, which can be detected remotely by monitoring the resonant frequency of the LC transponder. Broader Impact: The ability to use wireless techniques for radiation measurement in conjunction with a miniature dosimeter will provide a valuable tool in many areas such as radiation therapy, personnel, and environmental monitoring. The out come of this research will lead to a family of cost effective, small sized wireless in-situ radiation sensors. The techniques developed during the course of this project will also have a broad impact on many applications and devices that require the integration of electrets with MEMS microstructures (e.g., electromechanical transducers, particle filters, and infrared sensors).

智力优点：该传感器提案的重点是开发一种用于无线原位辐射剂量测定的新型微应答器。 所提出的传感器是完全无源的，即，不需要板上电源，从而避免了与有源电子器件（晶体管等）的辐射损伤相关的问题。 应答器是基于一种新的设备结构相结合的准永久电场与硅微机械驻极体。 微机械LC剂量计采用了一个阵列的悬臂梁偏转由驻极体产生的电场。 该阵列连接到片上螺旋线圈，从而形成无源LC谐振电路。 在暴露于电离辐射时，驻极体的表面电荷减少，因此减少了悬臂梁上的力（并因此减少了它们的偏转）。 这减小了梁和驻极体的底部电极之间的电容，这可以通过监测LC应答器的谐振频率来远程检测。 更广泛的影响：结合微型剂量计使用无线技术进行辐射测量的能力将在许多领域提供有价值的工具，例如放射治疗、人员和环境监测。 这项研究的结果将导致一个家庭的成本效益，小尺寸的无线原位辐射传感器。 在该项目过程中开发的技术也将对许多需要将驻极体与MEMS微结构集成的应用和设备产生广泛的影响（例如，机电换能器、颗粒过滤器和红外传感器）。