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PR #744 moved the files into 9 thematic folders via git mv but missed the READMEs due to a working-directory issue with git add. This PR adds the actual READMEs: - examples/research-sota/README.md (main overview) - examples/research-sota/01-physics-floor/README.md - examples/research-sota/02-placement/README.md - examples/research-sota/03-spatial-intelligence/README.md - examples/research-sota/04-rssi/README.md - examples/research-sota/05-cross-room-reid/README.md - examples/research-sota/06-structure-detection/README.md - examples/research-sota/07-negative-results/README.md - examples/research-sota/08-verticals/README.md - examples/research-sota/09-quantum-fusion/README.md Each sub-README documents: - Scripts + headlines table - Why this folder bounds/composes with others - Sample output / honest scope - Cross-references to related loop notes + ADRs Main README covers: - Folder map with thread numbers - Cross-folder dependency graph - 8-entry headline findings table - Reading order for newcomers (4 scripts in suggested order) - Honest scope (synthetic-physics caveats)
49 lines
2.5 KiB
Markdown
49 lines
2.5 KiB
Markdown
# 07 — Negative results (R13 contactless BP)
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**Productive failure**: empirical / physics-based scrutiny of widely-claimed but un-validated CSI capabilities.
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## Scripts
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| Script | Thread | Verdict |
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|---|---|---|
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| `r13_bp_physics_floor.py` | R13 | **Don't ship contactless BP from CSI as a primary RuView feature.** Four physics floors make it provably worse than a $20 arm cuff. |
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## The four floors (R13)
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| Floor | Need | Have | Gap |
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|---|---|---|---|
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| PTT temporal resolution | 0.5 ms (for 1 mmHg) | 10 ms typical, 1 ms max ESP32 | typical ESP32 deployment cannot do <20 mmHg |
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| Spatial separation of two body sites | 55 cm | 40 cm Fresnel envelope at 5 m | sites NOT resolvable by single link |
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| Pulse-contour SNR | +25 dB | +20 dB after bandpass | **5 dB short** (matches R6.1's 4.7 dB penalty) |
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| Vs $20 arm cuff baseline | ±2 mmHg | best published ±10 mmHg | **5× worse** + needs per-subject calibration |
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## Why R13 is sensor-bound, not physics-bound-period
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R20 (tick 37) + doc 17 + ADR-114 establish that **the 5 dB shortfall is the multi-scatterer penalty** (R6.1). It's sensor-bound: a different sensor (NV-diamond magnetometer at bedside) recovers what CSI cannot.
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| Sensor | Can detect HRV contour? | Can detect BP? |
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|---|---:|---:|
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| CSI alone (R13 NEGATIVE) | ❌ 5 dB short | ❌ same physics |
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| **NV-diamond at 1 m bedside** (ADR-114) | ✅ SDNN 119 ms | ✅ via mm-PWV |
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| Arm cuff (gold standard) | n/a | ✅ ±2 mmHg |
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## R13's value in the loop
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Categorising R13 as a **permanent physics-floor negative** initially saved engineering effort. Then R20 + doc 17 + ADR-114 recategorised it as **sensor-bound, recoverable**. This is the **research-loop pattern at its best**: explicit failure modes that survive scrutiny but get reclassified when new tools arrive.
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R20.1 (quantum-fusion demo) is the concrete demonstration that R13's recovery works.
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## Three niche scenarios where BP-from-CSI might close
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1. Single-subject **trend** monitoring (relative not absolute)
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2. Bed-instrumented controlled-still subject (25+ dB SNR achievable)
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3. Multistatic PWV with 6+ anchors + per-installation calibration
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The general "BP from a $9 ESP32 in the corner" claim does **not** close.
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## See also
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- Research notes: `docs/research/sota-2026-05-22/R13-contactless-bp-negative.md`
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- Recovery path: `docs/research/sota-2026-05-22/R20-*.md`, doc 17, ADR-114
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- The other 2 negative result categories: R12 (missing-tool, revisitable) in `06-structure-detection/`, R3.1 (architecture-error) in `05-cross-room-reid/`
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