Contrast phantom for passive millimeter wave imaging systems

摘要

In a system having a thermal backdrop (106) and a thermal illuminator (102), the thermal backdrop includes a body having a top face; a contrast phantom (114) positioned above the top face and aligned substantially parallel with the top face; and a reflective layer (112) located between the body and the contrast phantom and aligned substantially parallel with the top face. The thermal illuminator radiates thermal energy (104) in a first direction towards the contrast phantom; wherein the first direction is aligned with the top face such that when the thermal energy is radiated in the first direction a first portion of the thermal energy is absorbed by the contrast phantom and a second portion (116) is reflected by the reflective layer towards a millimeter-wave camera (118) in a second direction. Furthermore, the contrast phantom has a plurality of different portions (114A, 114B, 114C, 114D), each portion having a different respective thickness along the first direction.