Polarization spectral imaging system

Abstract

A polarization spectral imaging system includes a polarization imaging device, a rotation drive device, and a control device. The polarization imaging device includes a quarter-wave plate, a polarization module, and an imaging module. The rotation drive device is coupled to the quarter-wave plate. The control device is configured to: control the rotation drive device so that when the quarter-wave plate is located at each fast axis angle, acquire a corresponding spectral image from the imaging module; calculate a polarization parameter corresponding to each wavelength of an output pixel based on the angle value of the fast axis angle, the polarization detection angle value of the polarization module, and the spectral intensity signal values ​​of each pixel in the spectral images; combine the polarization parameters of the wavelengths into pixel information of the output pixel; and establish a polarization spectral image based on the pixel information of multiple output pixels.

Claims

1. A polarization spectral imaging system, comprising: a polarization imaging device, including a quarter-wave plate, at least one polarization module, and at least one imaging module, wherein, The quarter-wave plate and the at least one polarization module are located on an optical path, and the at least one imaging module is located on the optical path and corresponds to the at least one polarization module; a rotation drive device is coupled to the quarter-wave plate, and the rotation drive device is controllable to drive the quarter-wave plate to rotate at a plurality of fast axis angles; a control device is electrically connected to the rotation drive device and the at least one imaging module and configured to: control the rotation drive device so that when the quarter-wave plate is located at each of the fast axis angles, acquire a spectral image corresponding to each of the fast axis angles from the at least one imaging module, wherein the spectral image has a plurality of pixels, each pixel has a plurality of spectral intensity signal values, and the spectral intensity signal values ​​correspond to a plurality of wavelengths; calculate a polarization parameter corresponding to each wavelength of an output pixel based on the angle values ​​of the fast axis angles, one or a plurality of polarization detection angle values ​​of the at least one polarization module, and the spectral intensity signal values ​​of each pixel of the spectral image, and combine the polarization parameters of the wavelengths into pixel information of the output pixel; A polarization spectral image is established based on pixel information from multiple output pixels; wherein the polarization imaging device includes at least one beam splitting module located on the optical path and between the at least one imaging module and the quarter-wave plate, the at least one polarization module, the at least one beam splitting module, and the at least one imaging module forming at least one imaging component; a translation drive device is coupled to the at least one imaging component, the translation drive device being controllable to drive the at least one imaging component to move along a push-broom axis; a control device is electrically connected to the translation drive device and configured to: when the quarter-wave plate is at each of the fast axis angles, control the translation drive device to move the at least one imaging module along the push-broom axis in a push-broom manner to acquire the spectral image at each of the fast axis angles; wherein the at least one imaging module is a monochrome camera, the at least one polarization module is a polarizer and has one polarization analysis angle value; the quarter-wave plate has four fast axis angles.

2. The polarization spectral imaging system as claimed in claim 1, comprising a camera coupled to the translation drive and located in a confocal plane with the at least one imaging module; the control device being electrically connected to the camera and configured to: control the translation drive to selectively move one of the camera and the at least one imaging module upward along the push-broom axis into the optical path; and acquire an observation image from the camera when the camera is located in the optical path.

3. The polarization spectral imaging system as described in claim 1 or 2, wherein the number of the at least one polarization module, the at least one beam splitting module, and the at least one imaging module is a plurality of each, each polarization module, each beam splitting module, and each imaging module forms an imaging component, and the imaging modules can capture different wavelength ranges; the control device is configured to: when the quarter-wave plate is located at each of the fast axis angles, control the translation drive device to drive the imaging components, so that each of the imaging components is located on the optical path; and control the translation drive device to move the imaging module of the imaging component located on the optical path along the push-broom axis in a push-broom manner, so as to acquire the spectral image at each of the fast axis angles; Based on the angle values ​​of the fast axis angles, the polarization angle values ​​of the at least one polarization module, and the spectral intensity signal values ​​of the pixels of the spectral images of the imaging modules of each imaging component, the polarization parameters corresponding to the wavelengths of the output pixel are calculated, and the polarization parameters of the imaging components corresponding to the wavelengths of the output pixel are combined to form the pixel information of the output pixel.

4. A polarization spectral imaging system, comprising: a polarization imaging device, including a quarter-wave plate, at least one polarization module, and at least one imaging module, wherein, The quarter-wave plate and the at least one polarization module are located on an optical path, and the at least one imaging module is located on the optical path and corresponds to the at least one polarization module; a rotation drive device is coupled to the quarter-wave plate, and the rotation drive device is controllable to drive the quarter-wave plate to rotate at a plurality of fast axis angles; a control device is electrically connected to the rotation drive device and the at least one imaging module and configured to: control the rotation drive device so that when the quarter-wave plate is located at each of the fast axis angles, acquire a spectral image corresponding to each of the fast axis angles from the at least one imaging module, wherein the spectral image has a plurality of pixels, each pixel has a plurality of spectral intensity signal values, and the spectral intensity signal values ​​correspond to a plurality of wavelengths; calculate a polarization parameter corresponding to each wavelength of an output pixel based on the angle values ​​of the fast axis angles, one or a plurality of polarization detection angle values ​​of the at least one polarization module, and the spectral intensity signal values ​​of each pixel of the spectral image, and combine the polarization parameters of the wavelengths into pixel information of the output pixel; A polarization spectral image is constructed based on the pixel information of multiple output pixels; wherein, the at least one imaging module is a multispectral camera, the at least one polarization module is a polarizer and has a polarization detection angle value; the fast axis angles of the quarter-wave plate are four.

5. The polarization spectral imaging system as described in claim 4, wherein there are two polarization modules and two imaging modules, the two imaging modules can capture different wavelength ranges, and each polarization module and each imaging module forms an imaging assembly; a beam splitter is disposed between the quarter-wave plate and the polarization modules, the beam splitter divides the optical path into two optical paths, and the polarization module and the imaging module of each imaging assembly are located on each optical path; the control device is configured to: acquire the spectral image of the imaging module of each imaging assembly at each fast axis angle when the quarter-wave plate is located at each fast axis angle; calculate the polarization parameter corresponding to each wavelength of the output pixel based on the angle value of the fast axis angle, the polarization detection angle value of the at least one polarization module and the spectral intensity signal value of each pixel of the spectral image of the imaging module of each imaging assembly, and combine the polarization parameters of the two imaging assemblies corresponding to the wavelengths of the output pixel into the pixel information of the output pixel.

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