Broad spectral band prepositive aperture telecentric optical system
A technology of telecentric optical system and front light, which is applied in the field of Fourier optical system to achieve the effect of guaranteed quality, low price and long working distance
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[0025] The invention is a telecentric optical system with wide-spectrum segment automatic correction of secondary spectrum, long working distance and front light hole. It can be used as an independent optical system, or as a Fourier lens in an interference imaging spectrometer, especially for the Fourier optical system in a Sagnac Fourier imaging spectrometer.
[0026] The aperture stop 1 is located at the front focal plane F of the lens group 2, so it has the characteristics of front pupil and image space telecentricity. In the Sagnac interferometer, the chief rays of each field of view are parallel to the optical axis, so that the on-axis and off-axis optical path differences of the Sagnac interferometer are the same, and the uniformity of illumination on the image plane is improved. The closer the aperture stop 1 is to the lens group 2, the better the off-axis image quality will be. The invention is used for the Fourier lens in the Sagnac type Fourier transform imaging spe...
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