The invention discloses a wide spectrum and multi-channel imaging optical
system based on the middle image off-axis three-mirror technique. The wide spectrum and multi-channel imaging optical
system based on the middle image off-axis three-mirror technique comprises a visible channel and an
infrared channel, wherein a
light beam within the view field of the visible channel enters an optical
system and then is reflected by an off-axis three-mirror
primary mirror and an off-axis three-mirror
secondary mirror to reach a third mirror in the visible channel, and after the
exit pupil of the visible channel is filled with the reflected
light beam, an image is formed at the position of the focus plane of the visible channel; a
light beam within the view field of the
infrared channel enters a third mirror in the
infrared channel after being reflected by the off-axis three-mirror
primary mirror and the off-axis three-mirror
secondary mirror, the light beam reaches an intermediate-wave-and-long-wave color separation filter, a light beam in the intermediate wave view field is reflected through the front surface of the color separation filter, and an image is formed on the focus plane of an intermediate wave after the reflected light beam penetrates through an intermediate wave combined
optical filter; a light beam in the long wave view field perpetrates through the intermediate-wave-and-long-wave color separation filter and then penetrates through a long wave combined
optical filter, and then an image is formed on the focus plane of a long wave. The wide spectrum and multi-channel imaging optical system based on the middle image off-axis three-mirror technique has the advantages of being simple in structural mode, compact in structure, small in size, low in weight, large in number of spectrums, wide in spectrum section range, and capable of achieving wide-range, all-weather and
high resolution dynamic monitoring.