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 thereof, and a design method for the optical system, wherein 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 mirrors, the secondary mirror is a concave curved prism coated with a reflective film, and the primary mirror, secondary mirror, and third mirror form an offner structure; at temperature T1, the first inclined slit, primary mirror, The image planes of the secondary mirror, the third mirror, and the long-wave infrared spectrometer are all in the first optical path; at the temperature T2, the image planes of the first inclined slit, the primary mirror, the secondary mirror, the third mirror, and the long-wave infrared spectrometer are all in the second optical path; T1>T2. Without sacrificing the system image quality and the application environment of large temperature difference, the invention can simultaneously satisfy the installation and adjustment at normal temperature, the use at low temperature, good stability, small size and low mass, and low difficulty in processing and manufacturing in one system.

Description

technical field [0001] The invention belongs to the technical field of long-wave infrared spectrometers, and particularly relates to a double-slit long-wave infrared spectrometer, an optical system thereof, and a design method of the optical system. Background technique [0002] The fine spectroscopic ability of the spectrometer can detect small differences in matter. 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, geological mapping, chemical 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. ...

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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