Scanning interferometer device for measuring imaging Fourier transform spectrum

Abstract

The invention discloses a scanning interferometer device for measuring an imaging Fourier transform spectrum. The scanning interferometer device is composed of a beam splitter, a movable arm and a static arm. The scanning interferometer device is characterized in that the movable arm and the static arm are in light path folding structures and share a fixed double-faced plane reflecting mirror; two reflecting surfaces of the plane reflecting mirror are respectively used for vertically reflecting incident light beams of the movable arm and the static arm to the beam splitter; a compensation plate is inserted into a light path of the static arm to compensate a light path difference between the two arms. The folding structure of a light path of the movable arm can be used for overcoming the inclined and transverse movement problems of light beams in the movable mirror scanning process of a Michelson interferometer; the compensation plate is inserted into the light path of the static arm to reduce the high requirements on a dynamic range of an area array detector by the measurement of the imaging Fourier transform spectrum; the light paths of the two arms are folded and one double-faced plane reflection mirror is commonly used so as to reduce the volume of a scanning interferometer. A constructed imaging Fourier transform spectrometer is very small-sized and compact, and has good application benefits in a plurality of fields including physics, biology, chemistry, medicine, pharmacy, foods, environmental friendliness, remote sensing, spaceflight and the like.

Description

technical field [0001] The present application relates to a scanning interferometer device for imaging Fourier transform spectroscopy. Background technique [0002] The imaging Fourier transform spectrometer uses an area array detector instead of a single point detector, which expands the spatial resolution capability of the ordinary Fourier transform spectrometer, and can simultaneously acquire two-dimensional spatial image information and one-dimensional spectral information of the target to be measured to realize imaging Spectral (or spectral imaging) measurements. Under proper design, the imaging Fourier transform spectrometer can well inherit several spectral measurement advantages of the general Fourier transform spectrometer, such as: 1 multi-channel, 2 high luminous flux, 3 high spectral measurement accuracy, 4 wide measurement band, 5 high / tunable spectral resolution, 6 full-band resolution consistent. The rich spatial and spectral information acquisition capabili...

AI Technical Summary

Problems solved by technology

This greatly increases the space occupied by the scanning interferometer using it as a moving mirror, which is not conducive to the miniaturization and compaction of the imaging Fourier transform spectrometer constructed based on it.

[0006] In addition, the interference peak light intensity formed by the traditional imaging Fourier transform spectrometer at the brightest pixel and the darkest pixel of the target image may span a huge range, which poses extremely strict requirements on the dynamic range of the area array detector. requirements

If the pixel dynamic range of the area detector is not large enough, it will easily lead to the saturation of the interference signal measurement at the bright pixel or the interference at the dark pixel is too weak to be detected

thereby degrading the spectral measurement of the spectrometer

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