High-Efficiency Random Fiber Laser Based on Strong Random Fiber Grating for MHz Ultrasonic Sensing
Why this work is in the frame
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Bibliographic record
Abstract
An Erbium-gain random fiber laser based on a strong random fiber grating (RFG) is experimentally demonstrated and applied to MHz ultrasound wave detection. The strong RFG with up to −10 dB reflectivity as well as a highly-doped Erbium doped fiber (HD-EDF) enabled a highly efficient random laser radiation with 1-kHz narrow linewidth. With the RFG as the feedback and the sensing head, both burst and continuous ultrasonic signals of up to 8 MHz can be demodulated by dynamics analysis from the random lasing emission. Results show that the detected signal-to-noise ratio (SNR) of 5.1 MHz ultrasound signal remains larger than 43 dB. The proposed random fiber laser sensor provides a broad ultrasonic bandwidth, high sensitivity, simple structure, low cost and robustness to the harsh environment, suggesting prospective applications for ultrasonic wave-associated acoustic emission (AE) detection in structure health monitoring and biomedical diagnosis.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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 it