Eddy Current Based Flexible Sensor for Contactless Measurement of Breathing
Why this work is in the frame
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Bibliographic record
Abstract
Changes in the lung air volume change the conductivity distribution in the thorax. Based on this effect, we describe a non-contact instrument to measure lung volume which is suitable for applications such as monitoring of breathing in sleeping subjects for sleep apnea. The instrument is based on a magnetic coil is positionned in a flexible mattress underneath the subject. AM frequency current is applied to the coil to generates Eddy currents in nearby conductive tissues, which in turn generate a magnetic field opposed to the transmitted field. This effect makes changes in the thoracic conductivity distribution due to breathing and blood flow change the effective inductance of the coil. We describe a new design to measure this effect using a single transmit and receive coil. The coil forms part of a Colpitts oscillator tuned to be at its stability margin, in order to give large frequency changes for given changes in conductivity. The oscillator output is then demodulated using a frequency counter. This device was tested in healthy volunteers and showed a good correlation with pneumotachograph measurements.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| 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 it