Development of a Borehole Optical Fiber Strainmeter

该提案寻求资金，以开发使用光纤方法的井下垂直应变传感器。所提出的传感器将通过在井下只部署光学元件来提高鲁棒性。将电子元件置于沉积物水或地面之上。此外，光纤将部署在井眼套管外。应变计将部署在Piñon平面天文台（PFO），与现有的应变测量仪器包进行数据比较。这种发展的目标是扩大有用的测量频率范围。应变是理解地壳表面基本构造过程的一个组成部分。将使用PFO的现有井眼，并将数据与现有传感器的水平应变体积进行比较和验证。干涉处理系统已经研制成功。研究的两个主要目标是：1)改进和评估原型仪器的设计和性能；2)通过现有模型彻底验证垂直应变可以与水平应变相关的假设。管理计划规定pi和另外两名pi级人员每年获得0.5个月的薪金支助。两名开发技术人员和一名研究生将获得3个月的年薪和学费支持。研究项目助理将获得一个月的年薪支持。剩余的资金用于供应和仪器购置以及一般后勤费用。该项目将资助一名研究生，其结果将直接影响大地测量学领域，并在自然灾害监测方面具有社会意义

0827201ZumbergeThis proposal seeks funding to develop a down-hole vertical strain sensor using an optical fiber approach. The proposed sensor will increase robustness by deploying only optical components down-bore ? keeping electronic components at the sediment-water or above-ground level. Additionally, the fiber will be deployed outside the borehole casing. The strainmeter will be deployed at the Piñon Flat Observatory (PFO) to compare data with existing strain-measuring instrument packages. A goal of this development is to extend the useful measurement frequency range. Strain is an integral part of understanding fundamental tectonic processes in the surface crust. An existing borehole at PFO will be used and data will be compared and validated against horizontal strain volume from existing sensors. The interferometric processing system has already been developed. Two main intellectual goals are sought: 1) to improve and evaluate the prototype instrument design and performance, and 2) to thoroughly test the assumption vertical strain can be related to horizontal strain through existing models. The management plan has the PIs and two other PI-level personnel receiving 0.5 month per year salary support. Two development techs and a graduate student will receive 3 month per year salary and tuition/fee support. A research project assistant will receive one month per year salary support. The remaining funds support supply and instrumentation acquisition and general logistical costs. The project will support a graduate student and results will directly impact the field of geodesy and has societal relevance in natural hazard monitoring.***