{
  "recipe_id": "ST-TIN-2026-0301",
  "version": "1.0",
  "timestamp_utc": "2026-03-01T14:32:17Z",
  "location": {
    "facility": "Puget Sound Field Lab",
    "coordinates": {"lat": 47.6062, "lon": -122.3321, "alt_m": 12}
  },
  "environment": {
    "air_temp_c": 12.4,
    "humidity_pct": 78,
    "atmospheric_pressure_hPa": 1013.25,
    "anechoic_verified": true,
    "iso_standard": "ISO 3745 Class A"
  },
  "recording_chain": {
    "microphone": "Earthworks QTC1",
    "preamp": "Sound Devices MixPre-3",
    "gain_preamp_db": -12,
    "gain_digital_db": 6,
    "bit_depth": 24,
    "sample_rate_hz": 96000,
    "clock_source": "internal_crystal",
    "clock_drift_ppm": 0.001
  },
  "stimulus": {
    "material": "cold_rolled_steel_0.8mm",
    "material_properties": {
      "density_kg_m3": 7850,
      "youngs_modulus_GPa": 200,
      "surface_roughness_Ra_um": 1.2
    },
    "impact_type": "droplet_4-8mm",
    "droplet_diameter_mm": {"min": 4, "max": 8, "distribution": "log_normal"},
    "droplet_velocity_m_s": {"mean": 9.8, "std": 2.1},
    "drop_height_m": 5.0,
    "ambient_noise_floor_dBA": 23
  },
  "processing_pipeline": {
    "steps": [
      {"step": 1, "operation": "normalize_peak", "target_dbfs": -3.0},
      {"step": 2, "operation": "dc_removal", "method": "highpass_20hz"},
      {"step": 3, "operation": "trim_silence", "threshold_db": -60, "min_length_s": 0.1}
    ],
    "software": "Python 3.11.4 / librosa 0.10.1",
    "git_sha": "f96db2b56db778207297116b42573252f7431c4b"
  },
  "output_artifacts": [
    {"filename": "storm_on_tin_01.wav", "sha256": "a3f2b8c9d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1", "bytes": 48327193}
  ],
  "verification": {
    "spectral_analysis": "See ST-TIN-2026-0301-spectrogram.png",
    "impulse_response_check": "PASS",
    "snr_db": 62.4
  }
}