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Improving Chirped Fiber Bragg Grating Resolution for Position-Sensitive Sensors in Shock- and Detonation-Driven
Tetiana Y Bowley1, Kimberly A Schultz1, Jonathan A Hudston1
1Focused Experiments, Los Alamos National Laboratory, P940, Los Alamos, NM 87545, USA.
Sensors (Basel, Switzerland)
|May 4, 2026
Summary
This study introduces a novel method using two laser pulses to double the temporal and location resolution of chirped fiber Bragg grating (CFBG) sensors. This advancement enhances diagnostic capabilities for dynamic, high-explosive experiments.
Area of Science:
- Optoelectronics
- Sensor Technology
- Wave Propagation Analysis
Background:
- Chirped Fiber Bragg Gratings (CFBGs) are essential for monitoring detonation and shock waves.
- CFBGs utilize changes in refractive index to map wavelength to time, enabling spectrum analysis.
- Current methods have limitations in temporal and spatial resolution for dynamic events.
Purpose of the Study:
- To enhance the temporal resolution of CFBG sensors.
- To improve the spatial resolution of CFBG-based measurements.
- To provide a more detailed analysis of high-speed dynamic events.
Main Methods:
- Inscribing CFBGs with linearly chirped periodic index of refraction changes.
- Employing two co-linear laser pulses with orthogonal polarization and a 5 ns offset.
- Utilizing separate detectors and an oscilloscope for signal capture and analysis.
- Interleaving spectrograms from dual signals in post-processing.
Main Results:
- Achieved a doubling of CFBG temporal resolution.
- Demonstrated a corresponding doubling of location resolution.
- Successfully generated and interleaved two separate spectrograms.
Conclusions:
- The proposed two-polarization state technique significantly improves CFBG sensor resolution.
- This advancement offers enhanced capabilities for capturing and analyzing dynamic, high-explosive experiments.
- Doubled resolution will impact future sensor development and experimental analysis.
