太赫兹波大气衰减系数的测量精确度对太赫兹技术的工程应用有着重要的影响.介绍了一种用于测量大气衰减系数的高 Q 值准光谐振系统，通过测量不同相对湿度下的水分子吸收谱线，得到对应环境下的品质因数，进而计算出对应的大气衰减系数.将0.4 THz电磁波的大气衰减系数与毫米波传输模型分析结果进行了比较与分析.结果表明，在相对湿度较低的情况下，测量值与模型值相差较大；当相对湿度增加到17.79%以后，测量值与模型值吻合较好.%The measuring precision of terahertz atmospheric propagation coefficient has an important impact on engineering applications of terahertz technology. A High-Q Quasi-Optical Resonator System for measuring the atmospheric attenuation factor is introduced, which measures the absorption spectrum of water molecules under different relative humidity to obtain the corresponding quality factor of the environment, and then the corresponding atmospheric attenuation factor can be calculated. The difference between atmospheric attenuation factor of 0.4 THz electromagnetic wave and the results of Millimeter-wave Propagation Model(MPM) are compared and analyzed. The results show that,the measured values and the model values are quite different under low relative humidity; while the measured values fit well with the model values when the relative humidity is above 17.79%.
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