Aperture diaphragm adjusting method of terahertz imaging system

The present invention provides an aperture diaphragm adjusting method of the terahertz imaging system, the size of the aperture diaphragm of hundreds of millimeters can be adjusted, and the aperture diaphragm is light in size and convenient to adjust and has wide application in the field of terahertz imaging. A plurality of diaphragm blades are combined to form a fan blade structure with a closed central area in a closed state, each diaphragm blade is provided with a rotating connection point on the periphery, and a rotating shaft of a single steering engine is fixedly connected with the rotating connection point of the corresponding diaphragm blade. The array angles of the diaphragm blades are synchronously controlled through the same steering engine rotation angle controller, synchronous movement of the diaphragm blades is achieved, and therefore the size of the aperture diaphragm of the central area corresponding to the fan blade structure is changed. 本发明提供了一种太赫兹成像系统的孔径光阑调节方法，其可以实现数百毫米级孔径光阑的大小调节，且体积轻巧，调节方便