============================================================================== COHERENCE CLOCK v0.1 — PRACTICAL INSTRUMENT SPEC ============================================================================== Project: AVANAVA Document Type: ASCII Text Specification Status: Public Working Specification Scope: Practical first-build reference for a Coherence Clock Format: Plain text / ASCII Date: 2026-03-13 ============================================================================== 1. PURPOSE ------------------------------------------------------------------------------ The Coherence Clock is a passive temporal baseline instrument. Its purpose is to measure: * oscillator stability * phase drift * recurrence timing * short / medium / long window coherence envelope * correlation of drift against environmental conditions Its role is to act as a reference timing anchor for later AVANAVA instruments. 2. WHAT IT SHOULD AND SHOULD NOT CLAIM ------------------------------------------------------------------------------ It should claim: * stable local timebase * drift measurement * phase stability measurement * recurrence / event timing * environmental correlation * baseline logging It should not claim: * absolute time * direct proof of external field causes * direct detection of hidden substrates * causal attribution from drift alone 3. RECOMMENDED ARCHITECTURE ------------------------------------------------------------------------------ Use a two-layer design. 3.1 LAYER A — REFERENCE CLOCK CORE ---------------------------------- This is the heart of the instrument. Use: * one high-stability oscillator as the main reference * one secondary oscillator or resonant channel as the comparison channel * timestamped acquisition of both Best practical first choice: * TCXO or OCXO reference oscillator * comparator oscillator can be: - second TCXO - quartz module on a separate mount - LC oscillator - tuning-fork / piezo variant later For a first real build, quartz-based is the safest and clearest starting point. 3.2 LAYER B — CONTEXT AND INTERPRETATION ---------------------------------------- Add: * temperature * humidity * pressure * optional magnetic context * optional acoustic / vibration context This helps separate instrument drift from environmental drift. 4. MINIMUM HARDWARE SPEC ------------------------------------------------------------------------------ Required: * stable reference oscillator - preferably TCXO minimum - OCXO better for bench stability * comparison oscillator - second quartz module or simple LC test oscillator * low-noise power - clean regulated supply - separate analog and digital filtering if possible * frequency / phase capture - microcontroller timer / counter or frequency counter frontend - Raspberry Pi can log data, but should not be trusted alone as the precision timebase * temperature sensor * humidity / pressure sensor * mechanical enclosure - rigid - low-vibration - thermally buffered Strongly recommended: * magnetic sensor for context logging * MEMS accelerometer for vibration logging * shielded wiring * star grounding * buffered oscillator outputs * SD or SSD logging * battery-backed RTC for file timestamps only 5. SIGNAL CHAIN ------------------------------------------------------------------------------ The practical chain is: Oscillator -> buffer / filter -> phase / frequency capture -> drift engine -> coherence / time analysis -> environmental correction / logging 5.1 CHANNEL A ------------- Reference oscillator output 5.2 CHANNEL B ------------- Comparison oscillator output 5.3 PROCESSING -------------- * count cycles in fixed windows * measure phase difference between A and B * compute drift over time * detect relock / unlock events * compute short / medium / long coherence windows 5.4 CONTEXT CHANNELS -------------------- * temperature * humidity * pressure * vibration * optional local magnetic field 6. SOFTWARE SPEC ------------------------------------------------------------------------------ Core logged outputs should include: * timestamp * reference frequency estimate * comparison frequency estimate * delta-f * phase difference * phase drift rate * jitter estimate * rolling variance * short-window coherence score * medium-window coherence score * long-window coherence score * event flags for: - relock - unlock - spike - dropout - thermal step - vibration burst 6.1 SUGGESTED WINDOW STRUCTURE ------------------------------ * short window: 1 to 10 s * medium window: 1 to 10 min * long window: 1 to 24 h 6.2 ANALYSIS MODULES -------------------- * reference oscillator baseline * phase tracking engine * drift compensation profile * time-coherence analysis engine * environmental baseline correction 7. PRACTICAL BUILD CLASSES ------------------------------------------------------------------------------ 7.1 BEST FIRST BUILD — QUARTZ COHERENCE CLOCK v0.1 -------------------------------------------------- This is the recommended first build. Hardware: * 1 high-stability TCXO or OCXO reference * 1 second quartz oscillator on separate physical mount * Raspberry Pi for logging / UI * microcontroller or counter board for precise timing capture * temperature / humidity / pressure sensor * optional magnetometer * optional vibration sensor This gives: * real stability data * real drift envelopes * comparison between two oscillators * environmental coupling correlations * a proper baseline instrument 7.2 NEXT BUILD — QUARTZ + LC HYBRID ----------------------------------- After quartz v0.1 works, add: * an LC oscillator as a more environmentally sensitive comparison channel Then compare: * quartz vs quartz * quartz vs LC 8. PHYSICAL DESIGN RULES ------------------------------------------------------------------------------ Build the Clock like a fragile baseline instrument, not a rough sensor mashup. Use: * thermally buffered enclosure * short shielded signal lines * mechanically isolated oscillator mounts * no fan in enclosure if avoidable * separate dirty digital switching from oscillator section * physically label oscillator class and coupling mode Each build should declare: * oscillator class * environmental inputs * coupling method Example build declaration: Build Declaration ----------------- oscillator class: Quartz Coherence Clock environmental inputs: thermal, humidity, magnetic context only coupling method: passive enclosure, no deliberate field coupling 9. VALIDATION SPEC ------------------------------------------------------------------------------ 9.1 ACCEPTANCE TESTS FOR v0.1 ----------------------------- * power-on integrity - stable boot - no missing channels - logger starts cleanly * baseline check - confirm reference oscillator output is stable over warm-up - record warm-up curve * noise floor - measure phase / frequency noise with instrument left undisturbed - establish quiet-room baseline * zero-baseline stability - comparison channel at rest - no perturbation - measure natural delta-f and phase wander * short-run drift test - 30 min - 2 h - 12 h - 24 h if possible * environmental correlation - correlate drift with: - temperature - humidity - vibration - magnetic context if present 9.2 OUTPUT OF VALIDATION ------------------------ Produce: * baseline envelope * drift tables * recommended correction factors * known-noise periods * warm-up exclusion period 10. CORE METRICS ------------------------------------------------------------------------------ For a first real instrument, keep it to: * f_ref(t) — reference oscillator frequency estimate * f_cmp(t) — comparison oscillator frequency estimate * Delta_f(t) — difference frequency * phi(t) — phase difference * dphi/dt — phase drift rate * J(t) — jitter proxy * D(t) — drift metric * C_short — short-window coherence score * C_mid — medium-window coherence score * C_long — long-window coherence score * E_context(t) — environmental context vector 11. RECOMMENDED FIRST PHYSICAL BUILD ------------------------------------------------------------------------------ Coherence Clock v0.1: * Raspberry Pi as logger and dashboard * external precision oscillator board as reference * second oscillator board as comparison * microcontroller / counter frontend for accurate counting * BME280-class environment sensing or equivalent * optional vibration logging * optional magnetometer context channel * enclosed in a project box with the oscillator section isolated Suggested workflow: * warm up instrument * record 24 h baseline untouched * record baseline with windows closed / open, heater on / off, nearby movement, etc. * identify stable coherence windows * define drift envelope * use that as the master baseline 12. MAIN DESIGN MISTAKE TO AVOID ------------------------------------------------------------------------------ Do not make the first Clock too ambitious. Do not try to make it all at once into: * telluric probe * audio instrument * atmospheric collector * multi-field active driver * biological sensor platform First make the Clock a reference / context instrument. Then use it to anchor later probes. 13. FORMAL SPEC WORDING ------------------------------------------------------------------------------ Coherence Clock v0.1 — Practical Instrument Spec A passive temporal baseline instrument using a stable reference oscillator and a comparison oscillator to measure phase drift, recurrence stability, and coherence-envelope behaviour across short, medium, and long observation windows, with concurrent environmental context logging for drift interpretation and baseline correction. 14. BUILD PRIORITY ORDER ------------------------------------------------------------------------------ 1. stable reference oscillator 2. comparison oscillator 3. precise capture chain 4. environment sensors 5. logging software 6. drift and phase analysis 7. validation runs 8. only then add more exotic coupling 15. SUMMARY RECOMMENDATION ------------------------------------------------------------------------------ The strongest first version is a Quartz Coherence Clock with environmental logging. This gives a grounded, testable, instrument-first implementation of the Coherence Clock idea and provides a stable baseline for later AVANAVA development. 16. Measurement Method ====================== The Pico measures oscillator behaviour using hardware timer capture. Two possible approaches are supported in v0.1: - frequency counting within fixed time windows - edge timing using GPIO interrupt or timer capture Typical implementation: - count rising edges over a fixed interval - compare counts between oscillator A and B - compute delta over time More advanced phase tracking methods may be added in later versions. 17. Resolution Considerations ============================= Measurement accuracy depends on: - Pico timer resolution - measurement window length - oscillator frequency Longer measurement windows increase resolution of delta detection but reduce temporal responsiveness. 18. Future Upgrade Path — Drift Amplification ============================================= Future versions may include differential mixing of oscillator outputs to extract a low-frequency beat signal representing the difference between oscillators. This allows improved visibility of small drift behaviour without requiring higher-frequency measurement precision. ============================================================================== End of Working Specification ============================================================================== Copyright (c) 2026 AVANAVA LTD Released under the AVANAVA Research Commons License. See /licenses for full license terms. ============================================================================== End of Document — v0.1 ============================================================================== The canonical, citable version of this work is archived via AVANAVA Public Registry. Primary archive: OSF (Open Science Framework) Secondary archive: Zenodo (pending / optional) https://osf.io/qmrfw/overview#:~:text=Registration%20DOI,OSF.IO/QMRFW ==============================================================================