Spectral imaging system adopting variable-diameter fiber field-of-view divider to realize large field of view

Abstract

The invention discloses a spectral imaging system adopting a variable-diameter fiber field-of-view divider to realize a large field of view. The spectral imaging system comprises a front telescopic optical system, the variable-diameter fiber field-of-view divider and a spectral light splitting system, wherein the front telescopic optical system is used for completing collection of large field-of-view spectral information at a focal plane thereof; the variable-diameter fiber field-of-view divider comprises multiple sets of input terminal fields of view, multiple sets of output terminal fields of view and a variable-diameter fiber bundle; a large-size linear field of view of the front telescopic optical system is divided to multiple sets of the input terminal fields of view and regrouped inthe multiple sets of output terminal fields of view, and the multiple sets of output terminal fields of view are connected with the spectral light splitting system; and the spectral light splitting system is used for performing image field of view splicing on spectral imaging bands of the multiple sets of output terminal fields of view, so as to form the complete large field-of-view imaging spectral information. The spectral imaging system can perform optical division and regrouping on the large field of view to form small field of view groups, reduces the requirements of the large-size linearfield of view for the size of a spectral detecting system, and facilitates the miniaturization of the light splitting element and detector elements as well as the integration of the spectral imagingsystem.

Description

Technical field [0001] The invention relates to the technical field of imaging spectroscopy, in particular to a spectral imaging system that adopts a variable-diameter optical fiber field of view splitter to realize a large field of view. Background technique [0002] With the continuous improvement of informatization in today's society, space remote sensing information has become an important social and economic resource. The completion of many monitoring tasks related to the national economy and people's livelihood in the fields of aerial surveying and mapping, environmental monitoring, resource detection, etc. must be based on space remote sensing information. Conventional satellites and high-altitude aerial remote sensing have played an important role in earth observation, but many emergency dynamic surveys and monitoring that require high resolution and fast time cannot meet the application requirements. From the perspective of application requirements, increasing the field...

AI Technical Summary

Problems solved by technology

The more direct way is to directly optically register the object plane of the spectrometer with the image plane of the telescopic system, which requires a large spatial dimension of the image plane of the spectrometer, and requires a high-performance large-size detector to realize it. The demand increases, the cost of detectors increases exponentially, and it is not even technically available

Another method in the push-broom mode is the technical means of realizing knife-edge segmentation of the field of view. This method requires a high-precision knife-edge mirror. In addition, there are also situations in which the subsequent optical system has a large space and limited layout space. The field of view The further increase of , the scheme will become extremely complicated, and the space size will be doubled or even impossible to realize

Therefore, the current technical solution can only meet the observation requirements of a large field of view to a certain extent, and cannot become an ideal technical solution for airborne or spaceborne resource requirements.

Images