A Compact Wireless Passive Harmonic Sensor for Ammonia Sensing in Packaged Food
Why this work is in the frame
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Bibliographic record
Abstract
Sensing of volatile acidic/basic gases plays a significant role in the early detection of food spoilage. This letter presents a compact low-cost quasi-chipless sensor for monitoring of such gases. The sensor utilizes a dual-band annular ring antenna to receive, modulate, and retransmit an incoming interrogation signal at double the frequency and with an orthogonal polarization. The application of the sensor for monitoring ammonia is presented. The resonant frequency of the receiving mode of the antenna is sensitized to ammonia using a varactor-based transduction scheme utilizing a hydrogel-coated pH electrode pair. The sensor provides a linear response to the logarithm of the concentration of ammonia, a sensitivity of 2.3 MHz per unit log concentration and greater than 1-m range for a signal to noise of better than 30 dB.
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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 | 0.000 | 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 | 0.001 |
| 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