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Title: Coherent pulse interrogation system for fiber Bragg grating sensing of strain and pressure in dynamic extremes of materials

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.23.014219· OSTI ID:1212704
 [1];  [2];  [2];  [2];  [1];  [3];  [3];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); National High Magnetic Field Lab., Los Alamos, NM (United States)
  3. National Security Technologies, Santa Barbara, CA (United States)
+ Show Author Affiliations

A 100 MHz fiber Bragg grating (FBG) interrogation system is described and applied to strain and pressure sensing. The approach relies on coherent pulse illumination of the FBG sensor with a broadband short pulse from a femtosecond modelocked erbium fiber laser. After interrogation of the FBG sensor, a long multi-kilometer run of single mode fiber is used for chromatic dispersion to temporally stretch the spectral components of the reflected pulse from the FBG sensor. Dynamic strain or pressure induced spectral shifts in the FBG sensor are detected as a pulsed time domain waveform shift after encoding by the chromatic dispersive line. Signals are recorded using a single 35 GHz photodetector and a 50 GSamples per second, 25 GHz bandwidth, digitizing oscilloscope. Application of this approach to high-speed strain sensing in magnetic materials in pulsed magnetic fields to ~150 T is demonstrated. The FBG wavelength shifts are used to study magnetic field driven magnetostriction effects in LaCoO₃. A sub-microsecond temporal shift in the FBG sensor wavelength attached to the sample under first order phase change appears as a fractional length change (strain: ΔL/L<10⁻⁴) in the material. A second application used FBG sensing of pressure dynamics to nearly 2 GPa in the thermal ignition of the high explosive PBX-9501 is also demonstrated. In conclusion, both applications demonstrate the use of this FBG interrogation system in dynamical extreme conditions that would otherwise not be possible using traditional FBG interrogation approaches that are deemed too slow to resolve such events.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1212704
Alternate ID(s):
OSTI ID: 1221419
Report Number(s):
LA-UR-15-22176; OPEXFF
Journal Information:
Optics Express, Vol. 23, Issue 11; ISSN 1094-4087
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

References (19)

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  • Henson, B. F.; Smilowitz, L.; Romero, J. J.
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Cited By (4)

Real-time distributed monitoring of pressure and shock velocity by ultrafast spectrometry with Chirped Fiber Bragg Gratings: Experimental vs calculated wavelength-to-pressure sensitivities in the range [0–4 GPa] journal October 2018
Ultrafast fiber grating sensor systems for velocity, position, pressure, and temperature measurements conference May 2016
Ultrafast Fiber Bragg Grating Interrogation for Sensing in Detonation and Shock Wave Experiments journal January 2017
Fiber Bragg Grating Dilatometry in Extreme Magnetic Field and Cryogenic Conditions journal November 2017

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