A device for converting heterogeneous beam of radiation to homogeneous beam by absorption or refraction of unwanted components.
利用吸收或折射掉不需要的成分，把非单色光束变成单色光束的装置。
The results reveal that besides the nonlinearity and absorption, the diffraction is another important factor that affects the shock formation of an ultrasound beam.
结果表明：除了非线性强度、吸收外，衍射是另一个影响非线性超声束冲击波形成的重要因素。
Many molecules and particles in the atmosphere cause extinction of an incident beam of infrared radiation due to absorption and scattering processes.
由于吸收和散射的作用，大气中的许多分子和粒子使得红外光束消失。
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