Quantum dot spectral imaging system

Abstract

The invention discloses a quantum dot spectral imaging system which comprises a front telescope, a quantum dot array plate, and an image detector arranged in order. The image detector is at the back focal plane of the front telescope. According to the quantum dot array plate, quantum dot materials with different spectral transmission rate characteristics are parallelly made on a substrate along a spectral dimension direction, each quantum dot material covers one or more rows of detection pixels in the spectral dimension direction, and a quantum dot strip is formed. The scheme is based on the quantum dot spectral imaging system, compared with a traditional spectral imager, the system has the advantages of stable performance, a high energy utilization rate, a simple structure, a small volume, a light weight and low cost, the complexity and development cost of the system are effectively reduced, the system is suitable for airborne or spaceborne equipment, and especially the application requirement of load miniaturization is satisfied. In addition, an incident spectrum can be restored well by using a spectral reconstruction algorithm.

Description

technical field [0001] The invention relates to the technical field of spectral imaging, in particular to a quantum dot spectral imaging system. Background technique [0002] Spectral imaging technology is a new type of multi-dimensional information acquisition technology that combines imaging technology and spectral technology. It can obtain two-dimensional spatial information and one-dimensional spectral information of the detected target to form a data cube. Spectral imaging technology can realize comprehensive detection, perception and recognition of target characteristics, greatly expands the monitoring capability and target recognition of remote sensing detection technology, and has irreplaceable advantages of other remote sensing technologies. According to the different working principles of spectral imagers, spectral imagers can be divided into dispersion type, interference type, filter type and computational spectral imaging type. [0003] At present, the miniaturi...

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Problems solved by technology

[0004] 1) There are slits in the dispersive imaging spectrometer or Fourier transform imaging spectrometer, which will greatly cause the loss of light energy and limit the improvement of the signal-to-noise ratio of the spectral camera

This type of instrument requires complex spectroscopic devices, such as spectroscopic prisms or diffraction gratings, resulting in bulky, expensive, and difficult to develop systems, and it is difficult to meet the requirements of miniaturized loads.

For example, the hyperspectral imager of Germany's EnMap uses a spectrometer with a Fery curved prism. The system of the Fery curved prism spectrometer is large, and a slit is placed on the rear focal plane of the front telescope, resulting in a great loss of energy.

Complex optical systems are required, and these structures usually include a large number of light-splitting elements and require very high installation accuracy, which will increase the weight, volume and development cost of the system, and it is difficult to meet the requirements of miniaturization of the load

[0005] 2) Imaging spectrometers using optical filters or linear gradient filters can meet the needs of miniaturization, but the number of bands is limited, and there are deficiencies in photon efficiency, spectral resolution and narrow spectral range

For example, the multi-spectral camera with filter array developed by Xi'an Optical Machinery has added a filter to the camera system, placed it in front of the CCD detector, and plated it on the filter substrate along the direction perpendicular to the flight. Multiple narrowband filters; however, the filter coating process limits the number of spectral bands and cannot be used as a hyperspectral imager

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