Simultaneous distributed Brillouin strain and temperature sensor with photonic crystal fiber
Bibliographic record
Abstract
The strain and temperature dependence of the Brillouin loss spectra using Brillouin frequencies in a photonic crystal fiber with a partially Ge-doped core are studied for the first time. The spectrum of the photonic crystal fiber displays a multi-peak structure due to waveguide and antiwaveguide types of sound propagation. Our experiments demonstrate that the Brillouin frequency shift v<sub>B</sub> depends on strain and temperature of the photonic crystal fiber. For two main peaks that are attributed to the scattering from longitudinal acoustic waves in the Ge-doped center region and solid pure silica region of the core of the photonic crystal fiber, the strain coefficients are 0.048 and 09.055 MHz/με and temperature coefficients are 0.96 and 1.25 MHz/°C at wavelength of 1320 nm. Combining the measurements of the strain dependence of Brillouin frequency shift with measurements of the temperature dependence of Brillouin frequency shift, we demonstrate a simultaneosly distributed strain and temperature sensor with a spatial resolution of 15 cm, a temperature resolution of 1.3°C, and a strain resolution of 15με along a single photonic crystal fiber.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".