Terahertz wave beam transmission phase integrated measuring device for free space

The invention discloses a phase measuring device for terahertz free space wave beam output, which comprises a measuring front end formed by a three-axis displacement platform and a high-precision power detector, scans a wave beam plane at a plurality of adjacent positions in a transmission (longitudinal) direction, and outputs a wave beam to the measuring front end under the instruction of a control module. And the acquisition module synchronously records data of the corresponding sampling planes, transmits the data to a phase program for calculation, and reversely derives to obtain phase information of each to-be-measured plane through an iterative approximation mode on the basis of known amplitude information by using codes written based on a vector diffraction theory, so that measurement of the free space terahertz wave beam phase is realized. 本发明公开了一种用于太赫兹自由空间波束输出的相位测量装置，利用三轴位移平台和高精度功率探测器组成测量前端，在传输(纵向)方向上多个相邻位置处对波束平面进行扫描，在控制模块的指令下，采集模块同步记录对应采样平面的数据，并传输到相位程序中进行计算，利用基于矢量绕射理论编写的代码，在已知幅值信息的基础上通过迭代逼近的方式反向推导得到各