Aberration correction with a magnetic liquid active mirror
Bibliographic record
Abstract
We investigate active magnetic liquid mirrors and their use for the correction of non-axisymmetrical aberrations (like third-order coma and astigmatism). We are mainly concerned with their application to the correction of the severe aberrations of a telescope observing at large angles from the optical axis of its primary mirror. We performed numerical simulations showing that it is possible to generate third- and fifth-order coma and astigmatism by applying electrical currents to simple networks of copper wires. These wire networks generate a magnetic field that can deform the surface of a magnetic liquid (ferrofluid) to a desired optical surface. We present the results from laboratory tests on a prototype mirror demonstrating third-order coma and astigmatism. We show that it is possible to correct non-axisymmetrical aberrations by using an active ferrofluidic mirror. This novel type of deformable mirror could be used to correct the aberrations present in many optical systems, particularly in zenith telescopes, like liquid mirror telescopes, rendering them far more versatile and powerful.
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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 | 0.000 | 0.001 |
| 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) | 0.001 | 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 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".