Multi-spectral imaging method and device for cassegrain telescope

Abstract

The invention provides a novel multi-spectral imaging method and a device for a cassegrain telescope, which can be applied in the fields of multi-spectral laser radar, visible light and infrared remote sensing detection, environmental monitoring and the like. In the invention, the spliced cassegrain telescope is adopted for receiving multi-spectral light beams scattered from a target, the number of main lenses for splicing a primary mirror of the telescope is determined according to the number of the required detection spectra, and a bandpass filter is placed in front of each main lens for matching with the specific characteristics of the required detection spectra; and the light beam received by each main lens can produce an image on an image enhancer after the telescope, so that the imaging result on each spectrum of the same target can be finally obtained on a CCD (charge coupled device) camera. The structure is simple and flexible, and the images of the different spectra can be very easily obtained by using the different filters to be combined with the spliced cassegrain telescope.

Description

technical field [0001] The invention adopts the method of combining spliced ​​Cassegrain telescope and band-pass filter group, realizes the Cassegrain telescope multi-spectral imaging method and device with real-time performance and miniature structure, and belongs to laser radar, visible light and infrared remote sensing detection and other fields. Background technique [0002] The transmission optical system is expensive, difficult to test, and has chromatic aberration. The cost of the off-axis optical system is also high, while the Cassegrain (Cassegrain) system has the advantages of aplanatic aberration, tube length, and no actual light convergence point. Therefore, The most widely used in optoelectronic equipment is Cassegrain or improved Cassegrain optical system. [0003] The Cassegrain telescope is a reflecting telescope composed of two mirrors, invented by Cassegrain in 1672. The larger one is called the primary mirror, and the smaller one is called the secondary ...

AI Technical Summary

Problems solved by technology

Although these two methods are relatively mature, they have obvious disadvantages, which are mainly reflected in: although the first method has good real-time performance, it requires multiple image sensors, resulting in a large overall structure and unable to achieve miniaturization; The two methods require additional mechanical dials and drivers, can only collect sequential images, and cannot collect image information of the same observed scene in different spectral bands at the same time, and the real-time performance is poor

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