Hyperspectral camera, hyperspectral imaging device and control method

Abstract

The invention discloses a hyperspectral camera, a hyperspectral imaging device and a control method. Among them, the hyperspectral imaging device includes: an optical lens, which is used to collect the reflected light of the material; an entrance slit, which is located at the focal point of the optical lens, so that the reflected light can be focused to the entrance slit; The reflected light incident on the slit is divided into multiple beams of monochromatic light; the digital micro-mirror array includes multiple micro-mirrors. A beam line is focused by a spectroscopic system; a line array sensor is used to receive the beam line; a controller is used to adjust the working mode of the digital micro-mirror array to control the state switching sequence and switching time of multiple micro-mirrors. The hyperspectral imaging device of the present invention has the advantages of low spectral resolution, high-speed scanning mode with arbitrary wavelength selection or combination, and low cost.

Description

technical field [0001] The invention relates to the technical field of multispectral imaging, in particular to a hyperspectral camera, a hyperspectral imaging device and a control method. Background technique [0002] Hyperspectral technology is a technology formed by the cross fusion of spectroscopy and image technology. It can not only use image information to study the shape, size and distribution of targets, but also use spectral information to identify and classify substances. This technology was first used in the field of remote sensing, and was later introduced into the fields of medicine and agricultural testing. Also in the process of grain grading or waste recycling of agricultural products, hyperspectral technology can be used to automatically identify a variety of grains and waste products with complex shapes, but the huge number of grains and waste products requires scanning speed to be fast enough, and there are many wavelength data in the spectral data Theref...

AI Technical Summary

Problems solved by technology

Push-broom hyperspectral imaging has high spectral resolution and horizontal spatial average resolution, but its frame rate is low because all spectra in each row are collected, and its resolution in the direction of material movement is low; and because The area array sensor is used, and its cost is high, especially the near-infrared area array sensor with a wavelength greater than 1700nm. Manufacturers have less options and are very expensive.

Electronically controlled tunable filter imaging uses a voltage-tunable filter crystal plus a surface array sensor. The material does not need to move, and only the voltage can be adjusted to achieve spectral imaging with a selectable wavelength; the spectral resolution and two-dimensional The spatial resolution is high, the specified wavelength is selected for imaging, and the frame rate is fast, but the tunable filter crystals and area array sensors are more expensive, and the crystals and sensors in the near-infrared band are even more expensive

[0003] In the related art, the hyperspectral camera can obtain very rich spectral information because of its high spectral resolution, which can be used to detect and analyze agricultural diseases and medical ingredients. However, due to the large amount of spectral data, it cannot be applied to applications such as grain grading In online detection applications such as recycling and waste recycling, online detection applications require hyperspectral technology to have the function of arbitrary wavelength selection and high scanning speed, and have a low cost, but existing hyperspectral technologies or products cannot meet the above requirements

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