An Optical Fiber-Grating Borehole-Seismic-Detector

Weis高分辨率地震传感可以提高钻土安全性和效率，为地球物理提供更好的勘探工具。为了实现高空间分辨率（1m左右），地震探测器的频率响应必须达到2khz左右。由光纤布拉格光栅制成的探测器应该提供所需的频率响应，并且比以前的探测器更简单，更坚固。该项目的直接目标是设计、制造和测试一个使用光纤布拉格光栅的钻孔地震探测系统原型。该项目的长期目标是：(1)构建和测试一系列光纤光栅地震传感器；(2)完善拟议的地震探测系统；(3)在RockBit国际公司（RBI）和学院研究者之间建立工作关系；(4)与RBI合作，进一步将光纤传感器应用于井眼和随钻测量（MWD）传感。这个项目至少在三个方面具有重要意义。首先，提出的地震探测器将简单、可靠、容易复用，并且可能比现有的探测器更便宜。其次，它将使教师调查员和一名本科生了解当地制造公司的问题和挑战。第三，它将为课堂上的教学动机提供“现实世界”的工程实例。＊＊＊

9412474 Weis High resolution seismic sensing could improve earth-drilling safety and efficiency, and provide a better exploration tool for geophysics. To achieve high spatial resolutions (on the order of 1 m) a seismic detector must have a frequency response up to about 2 kHz. Detectors made of fiber Bragg gratings should provide the required frequency response and be simpler, and more rugged than prior detectors. The immediate goals of this project are to design, fabricate, and test a prototype borehole seismic detection system using optical fiber-Bragg-gratings. The longer term goals of this project are: (1) build and test an array of fiber-grating seismic sensors, (2) refine the proposed seismic detection system, (3) establish a working relationship between RockBit International Inc. (RBI) and the faculty investigator, and (4) work together with RBI on further applications of optical fiber sensors to borehole and measurement-while-drilling (MWD) sensing. This project will be significant in at least three ways. First, the proposed seismic detector will be simple, reliable, easily multiplexed, and potentially less expensive than present detectors. Second, it will allow the faculty investigator and an undergraduate student to learn the problems and challenges of a local manufacturing company. Third, it will provide "real-world" engineering examples for instructional motivation in the classroom. ***