{
  "geometry": {
    "material": "oil",
    "radius": 40,
    "thickness": 8,
    "aperture": 20,
    "temperature": 20,
    "dispersion": 1,
    "focusOffset": 0,
    "amber": 1,
    "exposure": 1,
    "sensorWidth": 36,
    "asymmetry": 0,
    "bubbleCount": 0,
    "bubbleRadius": 0.45,
    "haze": 0,
    "seed": 2026
  },
  "wavelengths": [
    643.8,
    546.1,
    467.8
  ],
  "notes": [
    "Representative presets, not measurements of actual gasoline or beer",
    "This comparison explicitly disables bubble and haze controls; see beer-volume.html for the optional volume model",
    "RGB spot RMS is geometric, not a diffraction-inclusive resolution metric",
    "Input field of view normalized to each material focal length"
  ],
  "results": [
    {
      "material": "oil",
      "model": {
        "nD": 1.46945,
        "reference": "NIST SRM 1922 mineral-oil proxy",
        "absorption": [
          0.018,
          0.055,
          0.16
        ],
        "temperatureModel": "NIST certified wavelength-dependent coefficients",
        "indexModel": "NIST table interpolation"
      },
      "nD": 1.46945,
      "rgbIndices": [
        1.46744,
        1.47149,
        1.47685
      ],
      "focalGreen_mm": 84.837430274237,
      "fNumber": 4.24187151371185,
      "paraxialBackFocus_mm": 79.40076403797308,
      "bestGreenBackFocus_mm": 78.36847166551725,
      "focusConvergence2048to4096_mm": 1.881399072090062e-7,
      "rgbSpotRMS_mm": [
        0.06742605842463727,
        0.030982909120253383,
        0.08509207608036999
      ],
      "alphaPerMM": [
        0.018,
        0.055,
        0.16
      ],
      "bulkTransmission8mm": [
        0.865887748059205,
        0.6440364210831413,
        0.27803730045319414
      ],
      "normalSurfaceTransmission": [
        0.9295104684844685,
        0.9285369324432644,
        0.9272437883943563
      ]
    },
    {
      "material": "gasoline",
      "model": {
        "nD": 1.425,
        "reference": "Representative clear gasoline; measured fuel indices 1.42–1.43 (Sensors 2016, 16, 724)",
        "absorption": [
          0.0002,
          0.0003,
          0.0008
        ],
        "temperatureModel": "Assumed dn/dT = -0.0005 / °C",
        "indexModel": "Assumed Cauchy dispersion B=0.004 µm², anchored nD=1.425 at 20 °C"
      },
      "nD": 1.425,
      "rgbIndices": [
        1.4231324167745247,
        1.4268944161732426,
        1.4317601919096372
      ],
      "focalGreen_mm": 93.69998408170129,
      "fNumber": 4.684999204085065,
      "paraxialBackFocus_mm": 88.09340246688565,
      "bestGreenBackFocus_mm": 86.94532293554911,
      "focusConvergence2048to4096_mm": 2.0903181052744912e-7,
      "rgbSpotRMS_mm": [
        0.0689602396998682,
        0.031176357878732106,
        0.08541027705129237
      ],
      "alphaPerMM": [
        0.0002,
        0.0003,
        0.0008
      ],
      "bulkTransmission8mm": [
        0.9984012793176064,
        0.9976028776973818,
        0.993620436379149
      ],
      "normalSurfaceTransmission": [
        0.9399440751891008,
        0.9390746774811999,
        0.9379454268507019
      ]
    },
    {
      "material": "beer",
      "model": {
        "nD": 1.34,
        "reference": "Pale lager host, optional gas inclusions and haze; nD representative value (KRÜSS), 8 EBC adopted",
        "ebc": 8,
        "spectralSlopeNM": 80,
        "temperatureModel": "Assumed aqueous dn/dT = -0.0001 / °C",
        "indexModel": "Daimon–Masumura water dispersion shifted to adopted beer nD=1.340"
      },
      "nD": 1.34,
      "rgbIndices": [
        1.3384733343989559,
        1.3414799435083962,
        1.3451547503993992
      ],
      "focalGreen_mm": 117.13718700148635,
      "fNumber": 5.856859350074318,
      "paraxialBackFocus_mm": 111.17362411803582,
      "bestGreenBackFocus_mm": 109.67432893736932,
      "focusConvergence2048to4096_mm": 2.726225147853256e-7,
      "rgbSpotRMS_mm": [
        0.06967922263656338,
        0.03253805726100839,
        0.08195418151609937
      ],
      "alphaPerMM": [
        0.005089951734228771,
        0.017262186331352885,
        0.04593688311288275
      ],
      "bulkTransmission8mm": [
        0.9600982904520021,
        0.8710137719069213,
        0.6924667441907197
      ],
      "normalSurfaceTransmission": [
        0.9585388979430584,
        0.9579141358395519,
        0.9571465942543907
      ]
    },
    {
      "material": "stout",
      "model": {
        "nD": 1.34,
        "reference": "Dark Irish stout-inspired host; adopted 80 EBC near upper BJCP Irish Stout range, not measured Guinness",
        "ebc": 80,
        "spectralSlopeNM": 80,
        "temperatureModel": "Assumed aqueous dn/dT = -0.0001 / °C",
        "indexModel": "Same representative beer host index and shifted water dispersion; darkness does not determine refractive index",
        "volumeModel": "Optional coarse gas inclusions and weak HG haze, not a calibrated nitrogen microbubble population"
      },
      "nD": 1.34,
      "rgbIndices": [
        1.3384733343989559,
        1.3414799435083962,
        1.3451547503993992
      ],
      "focalGreen_mm": 117.13718700148635,
      "fNumber": 5.856859350074318,
      "paraxialBackFocus_mm": 111.17362411803582,
      "bestGreenBackFocus_mm": 109.67432893736932,
      "focusConvergence2048to4096_mm": 2.726225147853256e-7,
      "rgbSpotRMS_mm": [
        0.06967922263656338,
        0.03253805726100839,
        0.08195418151609937
      ],
      "alphaPerMM": [
        0.050899517342287724,
        0.17262186331352886,
        0.45936883112882754
      ],
      "bulkTransmission8mm": [
        0.6655136444928411,
        0.2513334070077045,
        0.025350656571330663
      ],
      "normalSurfaceTransmission": [
        0.9585388979430584,
        0.9579141358395519,
        0.9571465942543907
      ]
    }
  ]
}