142 lines
5.0 KiB
C#
142 lines
5.0 KiB
C#
/*
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* 版本历史：
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* 1.0.0 (2024-10-13): 初始版本，实现紫外线在大气中的传输特性计算。作者：田建勇
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*/
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namespace AirTransmission
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{
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/// <summary>
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/// 紫外线传输模型类，用于计算紫外线在大气中的传输特性
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/// </summary>
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public class UVTransmittanceModel(WeatherCondition weather) : TransmittanceModel(weather)
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{
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/// <summary>
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/// 紫外线波长（微米）
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/// </summary>
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private const double UV_WAVELENGTH = 0.308; // 微米 (308 nm)
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/// <summary>
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/// 计算给定距离的紫外线透过率
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/// </summary>
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/// <param name="distance">传输距离（米）</param>
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/// <returns>紫外线透过率（0到1之间的值）</returns>
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public override double CalculateTransmittance(double distance)
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{
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double attenuationFactor = CalculateUVAttenuationFactor();
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double rainAttenuation = CalculateRainAttenuation(distance, UV_WAVELENGTH);
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double fogAttenuation = CalculateFogAttenuation(distance);
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double dustAttenuation = CalculateDustAttenuation(distance);
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double snowAttenuation = CalculateSnowAttenuation(distance, UV_WAVELENGTH);
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double transmittance = Math.Pow(STANDARD_TRANSMITTANCE, attenuationFactor * distance) *
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Math.Exp(-rainAttenuation - fogAttenuation - dustAttenuation - snowAttenuation);
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return Math.Max(0, Math.Min(1, transmittance));
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}
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/// <summary>
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/// 计算雨对紫外线的衰减系数K
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/// </summary>
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/// <param name="wavelength">波长（微米）</param>
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/// <returns>雨衰减系数K</returns>
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protected override double CalculateRainKCoefficient(double wavelength)
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{
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// 对于UV波段 (308 nm)
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return 0.4715;
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}
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/// <summary>
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/// 计算雨对紫外线的衰减系数α
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/// </summary>
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/// <param name="wavelength">波长（微米）</param>
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/// <returns>雨衰减系数α</returns>
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protected override double CalculateRainAlphaCoefficient(double wavelength)
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{
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// 对于UV波段 (308 nm)
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return 0.6296;
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}
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/// <summary>
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/// 计算雪对紫外线的衰减系数K
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/// </summary>
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/// <param name="wavelength">波长（微米）</param>
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/// <returns>雪衰减系数K</returns>
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protected override double CalculateSnowKCoefficient(double wavelength)
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{
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// 对于UV波段 (308 nm)
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return 0.5225;
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}
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/// <summary>
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/// 计算雪对紫外线的衰减系数α
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/// </summary>
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/// <param name="wavelength">波长（微米）</param>
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/// <returns>雪衰减系数α</returns>
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protected override double CalculateSnowAlphaCoefficient(double wavelength)
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{
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// 对于UV波段 (308 nm)
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return 0.7937;
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}
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/// <summary>
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/// 计算紫外线的总衰减因子
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/// </summary>
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/// <returns>紫外线总衰减因子</returns>
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private double CalculateUVAttenuationFactor()
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{
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double molecularFactor = CalculateUVMolecularFactor();
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double aerosolFactor = CalculateUVAerosolFactor();
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double visibilityFactor = CalculateVisibilityFactor();
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return molecularFactor * aerosolFactor * visibilityFactor;
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}
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/// <summary>
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/// 计算紫外线的分子散射因子
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/// </summary>
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/// <returns>紫外线分子散射因子</returns>
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private double CalculateUVMolecularFactor()
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{
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// UV分子散射比可见光更强
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return (Pressure / 1013.25) * (288.15 / Temperature) * 2.0;
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}
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/// <summary>
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/// 计算紫外线的气溶胶散射因子
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/// </summary>
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/// <returns>紫外线气溶胶散射因子</returns>
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private double CalculateUVAerosolFactor()
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{
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double q = 0.585 * Math.Pow(Visibility, 1.0/3.0);
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double aerosolFactor = 3.91 / Visibility * Math.Pow(UV_WAVELENGTH / 0.55, -q);
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if (Visibility < 5)
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{
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aerosolFactor *= (1 + (5 - Visibility) / 5);
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}
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if (IsDusty)
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{
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aerosolFactor *= 1.5;
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}
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return Math.Max(1, aerosolFactor);
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}
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/// <summary>
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/// 计算雾对紫外线的衰减
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/// </summary>
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/// <param name="pathLength">传输路径长度（米）</param>
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/// <returns>雾对紫外线的衰减</returns>
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private double CalculateFogAttenuation(double pathLength)
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{
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if (!IsFoggy)
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return 0;
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double q = 0.585 * Math.Pow(Visibility, 1.0/3.0);
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double beta = 3.91 / Visibility * Math.Pow(UV_WAVELENGTH / 0.55, -q);
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return beta * pathLength * 0.7; // UV在雾中的衰减可能比可见光更强
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}
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}
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}
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