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Optical design of multispectral sensor using off-axis three-mirror reflective optics

The Paper describes the designing of the multi-spectral sensor optical system using off-axis three-mirror reflective optics which is particularly suitable for wide-field, wide spectral range, multi-spectral and high resolution sensor imaging optics. The off-axis three-mirror reflective optics provides an obstruction free field of view and high spatial resolution over the wide-field, the relay optics is used to adjust the multiplication factors for infrareds. The optical system concludes three-mirror optics with large relative aperture and infrared relay optics, the dichroic mirror and filters subdivide the wide spectral range into nine bands, each corresponds to respective field. The working wavelength ranges from visible to medium wave band. The paper also analyses the selection of dichroic schemes. The MTF of each branch at respective fields which are all near the diffractive limit are also given. The MTF of the camera is also forecasted at the end of the paper.