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Probing the Ultimate Limit of Fiber-Optic Strain Sensing
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Journal Article
Probing the Ultimate Limit of Fiber-Optic Strain Sensing
2010
Overview
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 10⁻⁶ε hertz (Hz)⁻¹/² (where ε is the fractional length change). We report on strain measurements at the 10⁻¹³ε-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.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Exact sciences and technology
/ Fundamental areas of phenomenology (including applications)
/ General equipment and techniques
/ gravity
/ Lasers
/ Measurements common to several branches of physics and astronomy
/ Metrology, measurements and laboratory procedures
/ Optics
/ Physics
/ Sensors
/ Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
/ Strain
