Vibrométrie holographique multipoint. Dimensionnement, limites et applications
Bibliographic record
Abstract
In the vibro-acoustics field, Laser Doppler Velocimetry (LDV) is the most used tool for investigating dynamic measurements. The main drawback of LDV is that it can provide dynamic data at only a particular location of the inspected surface. Scanning techniques are an alternative approach to get full-filed measurement, but the object of interest has to be under a perfectly controlled excitation. In order to simultaneously obtain a collection of data points at the surface of the vibrating object, we propose an approach relater to multipoint vibrometry, which is based on very high-speed digital holography. The measurement system was designed according to a simulation based design, and this establishes rules for the experimental optimization. The method is experimentally validated and provides 5916 simultaneous measurement points at 50 kHz, which is the best performance of the current state of the art. Application of the method to the interaction between an acoustic wave and a two-dimensional acoustic black hole is described.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.022 | 0.005 |
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 source (direct Gemma or distilled Codex), 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".