这些量都可以由它们的光谱功率分布(spectral power distribution, SPD)来定义。SPD是关于波长的分布函数，它描述了每个波长上的光的总量值。
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目前，国外高功率激光驱动器实现远场分布平滑化的主流技术是基于正弦调频脉冲的光谱色散平滑技术(SSD)。
Nowadays, the mainstream of far field beam smoothing technology adopted by foreign high power laser drivers is smoothing by spectral dispersion (SSD) based upon sinusoidal frequency modulation.
在电离气体变色发光实现的基础上，测量了光谱相对功率分布。
On the basis of the realization of variable color luminescence in ionized gases, the relative spectral power distribution was measured.
在国家色温基准改造的研究课题中，通过辐射测量法得到了色温副基准灯的相对光谱功率分布，分别运用三种色温计算方法来处理这些数据。
In addition, the relative spectral radiant distribution from the national color temperature standards rebuilding is used to calculate the color temperature of the source in three ways.
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