Snapshot type compact mini full polarization spectrum detecting device and method of light field imaging

Abstract

The invention discloses a snapshot type compact mini full polarization spectrum detecting device and method of light field imaging. The device comprises an object lens, a light field modulation unit, a micro-optical array, a surface array detector and a data collecting, processing and displaying system; the object lens, the light field modulation unit, the micro-optical array and the surface array detector are arranged successively along the direction of incident light; the light field modulation unit is arranged in an aperture diaphragm position of the object lens, the micro-optical array is arranged in an image plane position of the object lens, and the surface array detector is arranged in the rear focal plane of the micro-optical array, and connected with the data collecting, processing and displaying system; the light field modulation unit comprise a polarization modulation module and a spectral optical filter array; and the polarization modulation module comprises a first double-wedge retardation plate, a second double-wedge retardation plate and a linear polarizer arranged successively in the direction of the incident light. The device is suitable for detecting all-optical information of a dynamic or rapid-change object, can effectively avoid negative influence caused by factors as object change, jittering noise or ambient change, and the device and method have potential application values in the fields including astronomy observation, space detection, remote sensing of the earth, machine vision and biomedical diagnosis.

Description

technical field [0001] The invention belongs to the field of optical remote sensing detection, in particular to a polarization spectrum imaging device. Background technique [0002] The electromagnetic wave radiated by the object contains important remote sensing information such as the space, spectrum and polarization of the target, which can not only be used to invert the shape and physical and chemical characteristics of the target, but also remove background noise to provide high-contrast surfaces, shapes, shadows and roughness degree and other information. In order to complement the advantages of spatial, spectral and polarization three-dimensional information and enhance the ability to detect targets in complex backgrounds, a new cutting-edge remote sensing detection technology that integrates three-dimensional information acquisition skills has emerged: polarization spectral imaging technology. Its data products can be regarded not only as multi-dimensional polarizat...

AI Technical Summary

Problems solved by technology

In 2009, literature [3] proposed to place parallel spectral filter arrays and linear polarization filter arrays at the aperture stop of the primary mirror in the device of literature [2], and use micro-aperture arrays to obtain linear polarization images and multispectral images; The device cannot obtain the information of circularly polarized light, and the polarization image is separated from the spectral image, so it cannot obtain the polarization information related to the wavelength

In 2013, the Chinese invention patent "imaging method of multi-spectral light field camera" (authorized announcement number: CN 103234527B) [9] proposed a Chinese invention patent "a snapshot-type high-throughput spectral imaging method and spectral imager" ( Authorized announcement number: CN 102944305B) [8] introduces a combined relay lens behind the device, and transfers the rear focal plane of the micro-optical array to the photosensitive surface of the detector for the second time, so as to facilitate the arrangement of the detector; but this method will increase the volume, which is not conducive to miniaturization; and this secondary imaging method is the same as the method reported in [1] in 1996. The innovation of [2] is to remove the rear secondary imaging optics of [1] and Realize system miniaturization

[0007] It can be seen that the existing compact snapshot polarization and spectral imaging device or method based on light field imaging can only obtain the information of linearly polarized light, and the linearly polarized light image and spectral image are separated and irrelevant

In 2012, Chinese invention patent, "interference light field imaging hyperspectral full polarization detection device" (authorized announcement number: CN102680101 B) [13] and Chinese invention patent, "synchronous polarization modulation interference imaging spectral polarization detection device and method" (application Publication number: CN102680101A) [14], both proposed to use the imaging type transverse shearing interferometer to receive the separated image points of the back focal plane of the microlens in the device in the document [2], and place four-partitioned image points at the aperture stop of the primary mirror. The full polarization modulation element is used to obtain the spectral image of the full Stokes polarization parameters; however, since the transverse shear interferometer needs to scan the target to obtain the interferogram corresponding to the full optical path difference, the devices reported in the two invention patents need to use time sequence acquisition method, snapshot acquisition cannot be achieved, and the system is complex and large in size

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