Test method of field of view for terahertz imaging system

Terahertz focal plane imaging technology is getting increasing attention in recent years. As we known, field of view (FOV) is an important index for a focal plane imaging system. It determines the complexity of the system to some extent. While in terahertz band, its test is a difficulty due to the lack of reference data and effective instruments. Our system, a continuous wave THz focus plane imaging system, is introduced in this paper firstly. And then a test method is designed and realized by the following technology: terahertz quasi optical path design, terahertz signal acquisition, electronic three axis motion stents and so on. The method has been used for our system´s FOV test. The 10°×10° results of experiments are in accord with that of theoretical analysis, which shows the effectiveness of the above method. At last of the article, a metal plate target is used to image for further verifying our method. The work of this paper may do some meaningful help in the integration of THz system.