T to dB conversion
Transmittance（T%）Indicating initial luminous flux or light intensity P0 The luminous flux or intensity after passing through an object P1 the ratio of, expressed as a percentage (%)： T% = (P₁/P₀) × 100%
Attenuation coefficient（Attenuation）（dB）The degree to which the energy or power of a light intensity signal decreases after passing through a specific medium: dB = 10 × log₁₀(P₀/P₁)
The relationship between optical density OD and dB: dB = 10 × OD
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