运用透射式太赫兹时域光谱技术提取可区分回波样品折射率,主要依靠测得信号的相位差计算得到.具体有两种方法:一是利用参考脉冲和太赫兹波第一次透过样品的脉冲信号,二是利用太赫兹波第一次透过样品的脉冲信号和经样品内部反射两次后的第二个透射信号.实际操作中入射光束与样品表面法线存在夹角,该夹角不易测量,计算时通常忽略,这会最终引起折射率的测量误差,且该误差与选用的折射率提取方法有关.在分析两种方法因夹角引起误差的基础上,提出一种全新的折射率修正方法,该方法能从理论上消除夹角引起的误差,同时实验验证了该方法的有效性. The use of transmissive terahertz time-domain spectroscopy to extract the refractive index can be distinguished echo samples, mainly rely on the measured signal phase difference calculated by the specific two ways: First, the use of reference pulses and terahertz waves through the first sample The second is the use of terahertz waves through the first sample of the pulse signal and the sample after the internal reflection of the second transmission of the second transmission signal in practice there is an angle between the incident beam and the sample surface normal, The angle is not easy to measure and is usually neglected in the calculation, which will eventually lead to the measurement error of the refractive index, and the error is related to the selected refractive index extraction method.Based on the analysis of the error caused by the included angle between the two methods, Refractive index correction method, the method can theoretically eliminate the error caused by the included angle, and experimental verification of the effectiveness of the method.