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首页三区阵列相干色散立体成像光谱仪:融合多维信息的创新技术
三区阵列相干色散立体成像光谱仪:融合多维信息的创新技术
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本文介绍了一种创新的光学设备——三区阵列相干色散立体成像光谱仪(Three-area-array coherent-dispersion stereo-imaging spectrometer)。该研究论文主要关注于结合了三维立体成像、干涉光谱学和色散光谱学的技术,旨在提供一种高精度的空间与光谱信息获取手段。 首先,这个系统采用了三个区域阵列探测器,每个探测器负责记录每个场景单元的三个不同视角的光谱图像。在每个视角下,一个特定列的探测器上,一个场景单元会被成像,而不同的波长则被分散到该列的不同行中。这种设计使得在同一时间,对于每个场景单元,能够在单个像素内生成多个干涉图,每个干涉图覆盖着不同的波长范围,从而实现多维度的数据采集。 通过这些干涉图,仪器能够生成透视视图图像,用于创建二维的正射照片,提供场景的平面布局信息。同时,前视图和后视图图像则结合立体成像技术,允许科学家重建出三维的立体图像,这对于地形分析、遥感和环境监测等领域具有重要意义。 理论计算部分是文章的核心内容,它详细阐述了这种仪器的工作原理和预期性能,包括如何通过数学模型来校准和处理多视角数据,以及如何从干涉和色散信息中提取深度和空间分辨率。这种仪器的独特之处在于它能同时获取空间的三维信息和光谱的丰富细节,为科学研究和应用提供了前所未有的综合能力。 这篇研究论文不仅介绍了三区阵列相干色散立体成像光谱仪的设计和工作原理,还探讨了其在实际应用中的潜在优势,如提高数据处理效率、增强对复杂场景的理解等。这是一项在光学成像和光谱测量领域具有前瞻性的技术突破,将对相关领域的研究和实践产生深远影响。
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The CDSIS combines interferometric spectroscopy with dispersive spectroscopy to get
spectral information of an object or a scene. The CDSIS integrates a moving corner-cube-
mirror interferometer and a plane transmission grating to obtain spectral information. For
each unit of the scene, the CDSIS simultaneously produces multiple interferograms in one
scan period of the moving CCM, each interferogram with a separate wavelength range and
located in a separate pixel of a given column of one area-array detector. More specifically, for
each scene unit, not only the transmission grating spreads the spectral information onto a
given column of one area-array detector, but also the interferometer simultaneously generates
multiple interferograms in one scan period of the moving CCM, each interferogram covering
a separate wavelength range controlled by the transmission grating and detector geometry,
each interferogram located in a separate pixel of the given column above. In other words, the
transmission grating divides a broad-band spectrum into a number of narrow-band spectra,
each narrow-band spectrum is located on a separate pixel of a given column of the detector,
and the interferometer simultaneously produces multiple interferograms for the broad-band
spectrum in one scan period of the moving CCM, each interferogram corresponds to a
different narrow-band spectrum. Thus any noise present in an optical signal is limited to the
pixels where this noisy signal impinges on, and these noise signals have no effect on the
interferograms with different narrow-band spectra. Moreover, the center fringes are spread
into multiple separate pixels (interferograms), each with a separate narrow-band spectrum,
thus the dynamic range requirement of the detector is reduced [69,70]. Therefore, the CDSIS
has the advantage of providing the high spectral resolution of interferometry, while avoiding
the multiplex disadvantage of interferometry for a broadband source in the ultraviolet-visible
spectral region, and reducing the dynamic range requirement of the detector. The CDSIS can
perform high spectral resolution measurements of a broadband source in the ultraviolet-
visible spectral region.
Throughout this paper, rows of each area-array detector are parallel to the y-axis of the
detector plane, columns of each area-array detector are parallel to x-axis of the detector plane,
o
λ
is the center wavelength of a source spectra covering a wavelength range from
1
λ
to
k
λ
(i.e., a wavenumber range from
min
1
k
σλ
= to
max 1
1
σλ
= if
1 k
λλ
< ), l is the displacement
of the moving CCM from the zero path difference (ZPD) position,
f
is the focal length of
the objective lens,
1
f
is the focal length of the collimating lens, and
2
f
is the focal length of
the collecting lens.
In Fig. 1, typical orthographic view light rays emerging from two representative object
points on a scan line (in Y-axis direction of the object coordinate system O-XYZ) of the scene
are drawn. One point
()
0,0,
ii
PZ is located on the optical axis of the objective lens. The
second point
()
0, ,
j
j
PYZ is displaced by a distance Y from the optical axis of the objective
lens. Moreover, six representative image points are shown:
()
0,0
i
P
′′
is the image point of
object point
()
0,0,
ii
PZ
on the back focal plane of the objective lens,
()
0,
j
Py
′′
′
is the image
point of object point
()
0, ,
j
j
PYZ on the back focal plane of the objective lens,
()
11
,0
iB
Px
′
is
the image point on area-array detector B of
()
0,0,
ii
PZ formed by wavelength
1
λ
,
()
,0
ik Bk
Px
′
is the image point on area-array detector B of
()
0,0,
ii
PZ formed by wavelength
k
λ
,
()
11
,
jB
Pxy
′
is the image point on area-array detector B of
()
0, ,
jj
P
YZ
formed by
wavelength
1
λ
,
()
,
jk Bk
Pxy
′
is the image point on area-array detector B of
()
0, ,
jj
P
YZ
formed by wavelength
k
λ
. It can be obtained that
Vol. 27, No. 2 | 21 Jan 2019 | OPTICS EXPRESS 1028
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