Infrared Fourier spectrum detector with ultrahigh spectral resolution

Abstract

The invention discloses an infrared Fourier spectrum detector with ultrahigh spectral resolution. An infrared light path consists of a pair of back-to-back angle mirrors, a pair of plane reflectors, a pair of obliquely-arranged reflectors, a beam splitter and a compensator; an angle mirror driving system consists of a linear motor and a linear bearing; and the angle mirrors are driven by the motor to perform linear reciprocating motion so as to generate light path difference. A reference light path and an infrared light path are in the same light path, the reference light path is positioned at the center part, and the infrared light path is positioned at the peripheral part. A reference light source adopts a frequency stabilized laser. A fore optical device is a horizontal access reflecting telescope, and a rear optical device focuses infrared interference light signals onto the infrared detector. The detector converts the interference light signals into electrical signals, the electrical signals are amplified by an amplifier and then converted into digital signals, and the interference signals are recorded by a data acquisition system according to position signals of a movable mirror so as to acquire an interference pattern. The interference pattern is subjected to Fourier transformation to acquire infrared spectrum signals.

Description

technical field [0001] The invention relates to space photoelectric instrument technology, specifically an infrared Fourier spectrum detector with ultra-high spectral resolution, which is applied to the detection of atmospheric components in satellite remote sensing. Background technique [0002] For the detection of atmospheric composition by satellite remote sensing, it is necessary to detect the fine infrared spectrum of chemical composition in many occasions. For example O 3 , H 2 O, CH 4 , N 2 O, and HNO 3 Wait. At present, there are three instruments in this field in the world. One is Germany's Michaelson Interferometer for Passive Atmospheric Sounding (MIPAS) (http: / / www.leos.le.ac.uk / mipas / ), and the other is Canada's Atmospheric Chemistry Experiment—Fourier Transform Spectrometer (ACE) (http: / / www.ace.uwaterloo.ca / ), and a Tropospheric Emission Spectrometer (TES) from the United States. The core system of the ultra-high spectral resolution infrared spectrom...

AI Technical Summary

Problems solved by technology

[0003] Because the ACE structure has a large corner mirror swinging turret, the moving mass is relatively large (see Figure 6); the motion of the ACE moving mirror is an arc motion, which is unfavorable for the uniform speed control of the optical path difference rate; in ACE, the moving mirror Mirror motion also causes lateral shear motion of light rays traveling from the corner mirror to the reflector, which is not good for interference

In addition, if the optical path difference is further increased to improve the spectral resolution, or the length of the rocker arm is lengthened, or the rocking angle is increased, the former will result in an increase in the size and mass of the moving part, while the latter will require an increase in the size and movement of the angle mirror. nonlinear

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