Resolution-adjustable Snapshot Image Spectrum Linear Polarization Detection Device and Method

Abstract

The invention discloses a resolution-adjustable snap-shot type image spectrum linear polarization detection device, which mainly solves the problems of the prior art which are limited by time resolution and detection azimuth angle and low luminous flux. It includes a front objective lens group, a microlens array, a collimating lens group, a polarization module, a dispersion module, an imaging lens group and a CCD detector, and these components are arranged in sequence along the direction of the main optical axis. The incident light is imaged at the microlens array by the pre-objective lens group. After the image is sampled, it becomes parallel light through the collimator group. The polarization spectrum is modulated by the polarization module. After the outgoing light passes through the dispersion module and the imaging mirror group, the CCD detector takes a snapshot Obtain the target polarization spectrum modulation image in one frame, and use Fourier transform and frequency domain filtering to realize real-time integrated acquisition of target image, spectrum and linear polarization information. The invention can realize multi-level adjustment of target spectrum and spatial resolution detection, is beneficial to achieve the best detection state and has high energy utilization rate, and can be used for real-time monitoring of targets.

Description

technical field [0001] The invention belongs to the technical field of imaging light detection, in particular to an image spectrum linear polarization detection technology, which can be used for real-time integrated acquisition of target image, spectrum and linear polarization information. Background technique [0002] Light is an electromagnetic wave, and intensity information, spectral information, and polarization information are all basic properties of light. Any object will show its own characteristics in the process of reflecting and radiating electromagnetic waves. With the rapid development of optical technology, various types of optical information acquisition technologies have emerged as the times require, such as imaging technology to describe the shape characteristics of the target, spectral technology to describe the interaction between substances and light of different wavelengths, and polarization technology to describe Scattering and reflective properties of...

AI Technical Summary

Problems solved by technology

However, due to the time and angle effects of the polarization spectrum distribution of two-dimensional space objects in remote sensing detection in the field, the essence of one-dimensional linear array push-broom data acquisition is to splice and process the one-dimensional spatial polarization spectrum information acquired at different times. The time resolution is limited, and on the other hand, the environmental factors experienced by each one-dimensional polarization spectrum unit are not the same, which creates many restrictions on the inversion of multi-dimensional optical information of the two-dimensional target scene

The signal-to-noise ratio of the original data acquired by the two-dimensional area array window scan is greatly improved compared with the one-dimensional linear array push-broom luminous flux. Different positions, that is, the corresponding detection azimuth and acquisition time are different, which will lead to the inconsistency of the restored polarization spectrum, and because the cause is not caused by the modulation of a single instrument itself, it is still possible to calibrate and calibrate the instrument in the later stage. cannot be completely eliminated

At present, snapshot ISPs researched internationally are mainly snapshot ISPs based on computed tomography, which realize the acquisition of target space and frequency domain information through low-dimensional projection of high-dimensional data, but the system resolution is limited due to low sampling of projection data. The shortcoming of the limitation, and the follow-up polarization spectrum restoration algorithm is complex and time-consuming, making it difficult to put into commercial production

Due to the low system luminous flux of the snapshot ISP based on aperture division or polarization focal plane array division, the signal-to-noise ratio of the acquired data is very limited, which limits its application range

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