Extended Data Fig. 8: Schematic of reflection 2D passive scanning imaging system.

A scanning imaging system (a) and bridge structured detector with integrating pre-amplifier (b). The imaging system consists of a scanning swing planar mirror, a concave mirror, a preamplifier, and the imaging control module. The visible to near infrared light enters the optical system beam from about 100 cm away. The hexagonal two-dimensional scanning swing mirror sized about 800 cm² has a Φ 30 mm circular hole in the center to allow the focused light to pass through. The aperture and the focal length of the concave mirror are both 250 mm. The position of the detector can be adjusted by using the linear XYZ platform which is located behind the scanning swing mirror. The focused light can be reflected by the swing mirror and the concave mirror before the detector finally receives it. A bridge structured detector and the integrating pre-amplifier are shown in panel b. The electrical signal of the photodetector can be read and amplified by the pre-amplifier and output to the imaging control module. By controlling the two-dimensional swing of the scanning mirror, the radiation signals at different positions of the target can be detected. The total imaging time is estimated to be about 600 seconds for the scanning of 128*128 = 16384 pixels.