Front objective lens with large field of view and large relative aperture for imaging spectrograph

A technology of imaging spectrometer and pre-objective lens, which is applied in spectrometry/spectrophotometry/monochromator, optics, instruments, etc. It can solve the problems of difficult to achieve large field of view, difficult to guarantee stability, difficult to install and adjust, etc. problem, to achieve the effect of high resolution, good stability and simple structure

Inactive Publication Date: 2013-03-06
SUZHOU UNIV
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  • Application Information

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Problems solved by technology

However, it is difficult to achieve a large field of view with a total reflection system, which is usually suitable for a linear field of view and requires push-broom to achieve wide coverage; at the same time, in order to avoid central obstruction, an off-axis structure is generally used, which is difficult to install and adjust , the stability is difficult to guarantee

Method used

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  • Front objective lens with large field of view and large relative aperture for imaging spectrograph
  • Front objective lens with large field of view and large relative aperture for imaging spectrograph
  • Front objective lens with large field of view and large relative aperture for imaging spectrograph

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Embodiment 1

[0019] The technical solution of the present embodiment is to provide a large relative aperture pre-objective lens with a large field of view for an imaging spectrometer, and its working band is , the system F number is F / #=4, and the full field of view is 35 degrees.

[0020] See attached figure 2 , which is the imaging optical path diagram of the large field of view and large relative aperture pre-objective lens optical system used in the imaging spectrometer provided by this embodiment; , followed by spherical positive lens 1, negative lens 21 and positive lens 22 of the first group of doublet lenses, positive lens 31 and negative lens 32 of the second group of doublet lenses, and positive lens 41 and 32 of the third group of doublet lenses Negative lens 42; the system is basically symmetrical about the diaphragm, and vertical axis aberrations, such as distortion and chromatic aberration of magnification, can be well corrected; the diaphragm 5 is located between the firs...

Embodiment 2

[0029] In this embodiment, the F number is F / No.=4, and the working band is short-wave infrared The full field of view is 40 degrees, the optical system structure and imaging optical path refer to the attached figure 2 .

[0030] The remaining parameters of the optical system are as follows: the focal length is 20mm, the radii of curvature of lens 1, lens 21, lens 22, lens 31, lens 32, lens 41 and lens 42 are respectively 25mm, -184mm, 5.8mm, 2.5mm, 6mm, -12mm , -2.8mm, -5.7mm, 19mm, -13.5mm, 29mm. Along the incident direction of light, the distances between lenses, diaphragms and lenses are 2.5mm, 0.1mm, 3.5mm, 2.5mm, 0.3mm, 1.7mm, 2.8mm, 3.8mm, 0.6mm, 3.3mm, 2mm, 7.5 mm; the refractive index of each lens is 1.44, 1.71, 1.43, 1.43, 1.71, 1.72, 1.55. The quadratic aspheric coefficient of the rear surface of the lens 22 is -3.6.

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Abstract

The invention discloses a front objective lens with large field of view and large relative aperture for an imaging spectrograph. The front objective lens is a transmission-type optical system, and the work waveband of the front objective lens is a short-wave infrared waveband; the structure of the optical system is a coaxial structure and is composed of a spherical positive lens and three groups of doublet lens; a diaphragm is positioned between the first group of doublet lens and the second group of doublet lens which are both bent to the diaphragm; the spherical positive lens and the third group of doublet lens are respectively arranged opposite to the first group of doublet lens and the second group of doublet lens. By using the transmission-type and coaxial structure, the front objective lens has the advantages of simple and compact structure, wide applicable waveband, small aberration, small distortion, good imaging quality, easiness for installation and debugging, and good stability; meanwhile, the front objective lens is free from barrier, and high in energy use rate; and the front objective lens provided by the invention also has the advantages of easiness for installationand debugging, large field of view, large relative aperture, strong light-harvesting ability, high resolution and has good application prospect.

Description

technical field [0001] The invention relates to a front objective lens with a large field of view and a large relative aperture for an imaging spectrometer, in particular to a front imaging objective lens with a large field of view and a large relative aperture that adopts a coaxial transmission structure and works in a short-wave infrared band. Background technique [0002] Imaging spectroscopy technology is an organic combination of imaging technology and spectroscopic technology. While performing two-dimensional optical imaging of the target object, its spectral information can be obtained, and it has become an important means of obtaining target information in the field of aviation and aerospace remote sensing. In recent years, with the continuous improvement of large-array planar detector technology, imaging spectroscopy technology has become more and more mature, and is developing in the direction of large field of view and high resolution. [0003] The working princip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/18G02B13/06G02B13/22G01J3/02
Inventor 季轶群贺虎成石荣宝徐莉沈为民
Owner SUZHOU UNIV
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