Multispectral terahertz camera

We describe a broadband terahertz camera based on a modular 64-element linear array of superconducting hot-spot microbolometers. Unlike many superconducting sensor arrays, the readout for this array is performed entirely by uncooled electronics; no SQUIDs or cryogenic HEMTs are employed. The operating principles for the microbolometer and the readout scheme are described and compared with those of similar superconducting sensors. The camera's design has been optimized for standoff detection, at 8 m range, of objects concealed on the person of individuals. Real-time operation is meant to eliminate the need for individuals being screened to remain stationary, or to cooperate in any other way with the screening operation.