Double-slit long-wave infrared spectrometer, optical system thereof and optical system design method

Abstract

The invention discloses a double-slit long-wave infrared spectrometer, an optical system and an optical system design method. The optical system comprises a first inclined slit, a second inclined slit, a primary mirror, a secondary mirror and a third mirror, wherein the primary mirror and the third mirror are spherical reflectors, the secondary mirror is a curved prism of which the concave surface is plated with a reflecting film, and the primary mirror, the secondary mirror and the third mirror form an offner structure; when the temperature is T1, the image surfaces of the first inclined slit, the primary mirror, the secondary mirror, the third mirror and the long-wave infrared spectrometer are located on a first light path; when the temperature is T2, the image surfaces of the first inclined slit, the primary mirror, the secondary mirror, the third mirror and the long-wave infrared spectrometer are located on a second light path; and T1 is greater than T2. Under the condition that the image quality of the system is not sacrificed and the application environment has large temperature difference, the requirements of normal-temperature installation and adjustment and low-temperature use are met in one system at the same time, the stability is good, the size is small, the mass is small, and meanwhile, the processing and manufacturing difficulty is low.

Description

technical field [0001] The invention belongs to the technical field of long-wave infrared spectrometers, and in particular relates to a double-slit long-wave infrared spectrometer, an optical system and an optical system design method thereof. Background technique [0002] The fine spectroscopic ability of the spectrometer can detect small differences in substances. As one of the main transmission windows of the atmosphere, the long-wave infrared spectrum is also an important coverage area for the spectral characteristics of ground objects. Therefore, the long-wave infrared spectrometer is used in mineral exploration and geological mapping. It has important application value in military and civilian fields such as gas detection and classification, military camouflage recognition and underwater target detection. [0003] The long-wave infrared spectrometer has serious background radiation, which will seriously affect the recognition of the target by the spectrometer. The supp...

AI Technical Summary

Problems solved by technology

Although low-temperature fine-tuning is possible with some piezo actuators, reliability is difficult to guarantee

[0011] In summary, the low-temperature long-wave infrared spectrometer designed by the existing method has problems such as system complexity and volume increase, few materials to choose from, and long design cycle, which are not the most ideal method.

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