Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica (INO) and European Laboratory for Non-Linear Spectroscopy (LENS), Comprensorio A. Olivetti, Via Campi Flegrei 34, I-80078 Pozzuoli (Naples), Italy.
Science. 2010 Nov 19;330(6007):1081-4. doi: 10.1126/science.1195818. Epub 2010 Oct 28.
The measurement of relative displacements and deformations is important in many fields such as structural engineering, aerospace, geophysics, and nanotechnology. Optical-fiber sensors have become key tools for strain measurements, with sensitivity limits ranging between 10(-9) and 10(-6)ε hertz (Hz)(-1/2) (where ε is the fractional length change). We report on strain measurements at the 10(-13)ε-Hz(-1/2) level using a fiber Bragg-grating resonator with a diode-laser source that is stabilized against a quartz-disciplined optical frequency comb, thus approaching detection limits set by thermodynamic phase fluctuations in the fiber. This scheme may provide a route to a new generation of strain sensors that is entirely based on fiber-optic systems, which are aimed at measuring fundamental physical quantities; for example, in gyroscopes, accelerometers, and gravity experiments.
相对位移和变形的测量在结构工程、航空航天、地球物理和纳米技术等许多领域都很重要。光纤传感器已成为应变测量的关键工具，其灵敏度限值在 10(-9) 到 10(-6)ε hertz(-1/2) 之间（其中 ε 是长度变化的分数）。我们报告了使用光纤布拉格光栅谐振器进行应变测量的结果，该谐振器采用二极管激光源，并通过石英约束光频梳进行稳定，从而接近光纤中热力学相位波动所设定的检测极限。该方案可能为新一代完全基于光纤系统的应变传感器提供一种途径，这些传感器旨在测量基本物理量；例如，在陀螺仪、加速度计和重力实验中。
