Miniaturization method of long-wave infrared spatial modulation interferometry

Abstract

The invention relates to a long-wave infrared space modulation interference miniaturizing method. The method is characterized in that an interference assembly is composed of a spectroscope, a pyramid reflector I, a pyramid reflector II and two aperture diaphragms; an included angle between the spectroscope and parallel incident light is 135degree; from the optical axis position of reflected light, the top position of the pyramid reflector I starts to move anticlockwise for 1 / 4 transverse shear amount along the direction vertical to the optical axis of the reflected light; from the optical axis position of transmitted light, the top position of the pyramid reflector II starts to move anticlockwise for 1 / 4 transverse shear amount along the direction vertical to the optical axis of the transmitted light; and the two aperture diaphragms are respectively arranged at the top positions of the two pyramid reflectors, and are respectively placed vertical to the optical axes of the reflected light and the transmitted light. Under the condition that optical parameters are consistent, the size of the spectroscope is decreased, the sizes of the interference assembly and a spectrometer are effectively controlled, the difficulties in material growing and processing are reduced, and the cost is saved.

Description

technical field [0001] The invention belongs to the field of interference spectroscopy and relates to a miniaturization method for space modulation interference in the long-wave infrared band. Background technique [0002] Since the appearance of the first Fourier transform imaging spectrometer in the 1960s, it has a history of more than 40 years. The early time-modulated Fourier transform spectrometer technology based on moving mirror scanning has been very mature and widely used in the fields of aerospace and aviation remote sensing. In the 1980s, in order to overcome the shortcomings of the time-modulated Fourier transform spectrometer based on moving mirror scanning, people began to study the spatially modulated Fourier transform spectrometer. The Lawrence Livermore National Laboratory of the United States has carried out research on the infrared band and imaging Fourier transform (IFT) system, and has done related simulation experiments. With the support of the U.S. A...

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Problems solved by technology

This method is the closest to the prior art of the present invention, and solves the problems such as the large size of the Sagnac interferometer prism, the difficulty of prism bonding and the plating process of the beam splitter film, etc. However, the actual design size is still too large, and the beam splitter needs to be used Larger special crystal materials have higher requirements for optical processing

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