A high-speed hyperspectral full-polarization imaging device and method based on AOTF and intensity modulation
An imaging device and intensity modulation technology, applied in spectrometry/spectrophotometry/monochromator, polarization spectrum, measuring device, etc., can solve the problems of serious temperature drift, low time resolution, poor stability, etc.
Active Publication Date: 2021-04-20
ZHONGBEI UNIV
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[0004] In order to overcome the deficiencies in the prior art, the present invention provides a high-speed hyperspectral full-polarization imaging device and method based on AOTF and intensity modulation to solve the problems of low time resolution, poor stability, and serious temperature drift in the prior art.
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[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0026] Such as figure 1 As shown, a high-speed hyperspectral full-polarization imaging device based on AOTF and intensity modulation, the device includes a front afocal optical system 1, a first phase retarder 2, a second phase retarder 3, a first polarizer 4, an acoustic Optically tunable filter 5 , second polarizer 6 , imaging lens 7 and high-speed CCD camera 8 . The front afocal optical system 1 adopts an afocal system, including a first lens 11, a second ...
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The present invention relates to the technical field of spectral polarization imaging, more specifically, to a high-speed hyperspectral full-polarization imaging method and device based on AOTF and intensity modulation. Polarization intensity modulation, inverse Fourier transform is performed on the spectrum obtained by AOTF after polarization intensity modulation to obtain an autocorrelation function, so that each element of the Stokes parameter is modulated in a different frequency band, and the signal of the corresponding frequency band is intercepted for demodulation to obtain the spectrum of each element of the Stokes parameter. Combined with AOTF spectral imaging to achieve high-speed hyperspectral full polarization imaging measurement. The polarization demodulation process of this method is a purely mathematical calculation process, and the polarization modulation does not require additional time in the measurement. The full polarization imaging time of the entire spectrum is equivalent to that of ordinary AOTF spectrum imaging, which improves the time resolution of the system.
Description
technical field [0001] The invention relates to the technical field of spectral polarization imaging, more specifically, to a high-speed hyperspectral full-polarization imaging method and device based on AOTF and intensity modulation. Background technique [0002] Spectral polarization imaging technology is currently one of the most advanced optical multi-dimensional detection technologies in the world. This technology is a four-dimensional signal acquisition technology integrating two-dimensional spatial images, one-dimensional spectrum and one-dimensional polarization. Spectral polarization imaging technology can provide The four characteristics of the measured target in space image, light intensity, spectrum and polarization greatly increase the amount of information of the measured target. Therefore, it has significant advantages in classifying, analyzing and identifying substances, and has been widely used in atmospheric remote sensing, space exploration, chemical analy...
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IPC IPC(8): G01J3/28G01J3/447G01J3/02G02B27/28
CPCG01J3/0208G01J3/2823G01J3/447G02B27/28
Inventor 张瑞陈媛媛李克武景宁王志斌解琨阳
Owner ZHONGBEI UNIV