Linear gradual filter type multispectral imager based on secondary imaging

A linear gradient filter, multi-spectral imaging technology, applied in the field of spectral imagers, can solve problems such as spectral aliasing and ghost images, and achieve the effect of avoiding ghost images and eliminating the influence of spectral resolution.

Inactive Publication Date: 2015-01-21
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, its disadvantage is that the distance between the filter and the detector has a great influence on the spectral resolution, and the phenomenon of spectral aliasing is very serious; in addition, the light is easy to interfere between the filter and the detector Phenomenon, also can cause ghost images at the same time

Method used

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  • Linear gradual filter type multispectral imager based on secondary imaging
  • Linear gradual filter type multispectral imager based on secondary imaging
  • Linear gradual filter type multispectral imager based on secondary imaging

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Embodiment

[0026] figure 1 This is a schematic structural diagram of a linear gradient filter type multispectral imager based on secondary imaging provided by an embodiment of the present invention. Such as figure 1 As shown, the multispectral imager mainly includes:

[0027] The front imaging system, linear gradient filter, transmission relay imaging objective lens and detector are arranged in sequence;

[0028] The front imaging system realizes the function of imaging the target, the linear gradient filter is placed on the primary image plane of the front imaging system to realize the spectral division of the space target, and the transmission relay imaging objective lens Imaging the primary image plane after spectral division on the detector again, and the detector acquires and records digital information through the photoelectric effect;

[0029] Wherein, the distance between the linear gradient filter and the front imaging system and the transmission relay imaging objective lens is not le...

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Abstract

The invention discloses a linear gradual filter type multispectral imager based on secondary imaging. The linear gradual filter type multispectral imager based on secondary imaging comprises a front imaging system, a linear gradual filter, a transmission type relay imaging objective lens and a detector, wherein the front imaging system, the linear gradual filter, the transmission type relay imaging objective lens and the detector are arranged in sequence. The front imaging system is used for imaging an object. The linear gradual filter is arranged on an instant image surface of the front imaging system and used for achieving spectral division of a space object. The transmission type relay imaging objective lens is used for imaging the instant image surface subjected to spectral division onto the detector again. The detector obtains and records digital information through the photoelectric effect. The distance between the linear gradual filter and the front imaging system and the distance between the linear gradual filter and the transmission type relay imaging objective lens are not smaller than a preset value. By the adoption of the multispectral imager, influences of spectrum aliasing on the spectral resolution can be completely eliminated, and meanwhile forming of a ghost image is avoided.

Description

Technical field [0001] The invention relates to the technical field of spectral imagers, in particular to a linear gradient filter type multi-spectral imager based on secondary imaging. Background technique [0002] Spectral imaging technology is widely used in various fields such as resource exploration, environmental and disaster monitoring, and criminal material evidence identification because it can obtain the space image and spectral information of the target at the same time. According to the different light splitting methods, spectral imaging technology can be divided into prism splitting type, filter splitting type, grating splitting type and interference type. Prism and grating dispersive spectral imagers appeared earlier and the technology is the most mature. Most spectral imagers use this type of spectroscopic technology. The interference-type spectral imaging detection technology adds an interferometer, such as a Michelson interferometer or a Sagnac interferometer, t...

Claims

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Application Information

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IPC IPC(8): G01J3/28G01J3/02G06T5/00
Inventor 方煜柳青李杨张桂峰聂云峰章文洁
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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