公开(公告)号：US20230144266A1

公开(公告)日：2023-05-11

申请号：US17768985

申请日：2020-10-16

Applicant: Thruvision Limited

Inventor： Christopher Mark MANN ,  Stefan Matthew HALE ,  Leslie Owen GREEN ,  Stephen Paul HAWORTH

IPC: G01N21/3581 ,  G01N21/21

CPC classification number: G01N21/3581 ,  G01N21/21 ,  G01N2021/1772

Abstract: A high-frequency detection system (100) such as a terahertz camera is disclosed which includes a first detector array (102), a second detector array (104), and a polarizing plate (106). The polarizing plate is interposed between the detector arrays such that it passes and/or reflects radiation signals (110) from a source (108) to the detector arrays. A first radiation signal (112) having a first polarization is passed through the polarizing plate to the first detector array, and a second radiation signal (114) having a second polarization is reflected from the polarizing plate to the second detector array. Both radiation signals are from source (108), which can be one or more human beings emitting radiation towards the detection system. In some embodiments, the detector arrays (102, (104) may be joined. Each of the detector arrays comprises one or more input channels, such as feedhorns (116, 118, 120) which capture radiation from source (108) and pass the received signal into other portions of the system for subsequent processing. Input channels and local oscillator channels are aligned to one axis, and output channels are aligned to an axis perpendicular thereto. The system may further include a scanning mechanism (126). The detection systems described herein can use a heterodyne mixer. For instance, the array of feedhorns deliver incoming radiation via waveguides to a diode-based mixer with an intermediate frequency output to processing circuitry. System (100) can be used for the detection and identification of weapons, threats, illicit goods, and stolen items.