Method and device for eliminating astigmatism based on lenticular lens middle-stepped grating spectrometer

A technology of echelon grating and cylindrical lens, applied in the field of optical instrument design, can solve the problems of difficult processing, unfavorable industrial productization, high cost, etc., and achieve the effects of reducing machining cost, facilitating industrial application and easy operation.

Inactive Publication Date: 2017-10-24
TIANJIN UNIV
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Problems solved by technology

As for astigmatism, existing solutions such as the use of cylindrical mirrors or toroidal mirrors to correct and compensate methods require specially customized non-standard optical mirrors, which have the disadvantages of difficult processing, high cost, and unfavorable industrialization.

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  • Method and device for eliminating astigmatism based on lenticular lens middle-stepped grating spectrometer
  • Method and device for eliminating astigmatism based on lenticular lens middle-stepped grating spectrometer
  • Method and device for eliminating astigmatism based on lenticular lens middle-stepped grating spectrometer

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Embodiment Construction

[0026] The technical solution adopted in the present invention is a design method and device for an astigmatism-eliminated échelle grating spectrometer based on a cylindrical lens, which consists of the following parts:

[0027] The first part, the astigmatism correction method of échelle spectrometer based on cylindrical lens, such as figure 1 shown. Select a ready-made standard cylindrical lens with a known radius of curvature r c , central thickness t 0 ; According to the detection spectral range (190-600nm), determine the upper limit and lower limit wavelength of spectrometer detection. Using the lower limit wavelength (190nm), combined with the off-axis angle of the spherical focusing mirror, determine the initial distance L between the cylindrical lens and the plane mirror c0 ; Using the upper limit wavelength (600nm), combined with the prism dispersion angle variation Δβ t , to determine the cylindrical lens deflection angle ζ.

[0028] The second part, astigmatism...

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Abstract

The invention belongs to the field of optical instrument design. In order to propose an astigmatism correction method used for a middle-stepped grating spectrometer, a method that can be extended to a similar type CT spectrometer. The astigmatism correction is implemented in a wide band range, and the method is applied to realize wide-band, high-precision amd compact spectrometer development. The technical scheme adopted by the invention is that a cylindrical lens is arranged in front of a stepped grating CCD with a known radius of curvature rc and a center thickness t0 based on the aseptic method of the lenticular middle-stepped grating spectrometer; and according to the detection spectral range, the lower limit wavelength is used, combined with the off-axis angle of the spherical focusing lens to determine the initial distance between the cylindrical lens and the plane mirror Lc0; and the upper limit wavelength is used, combined with the prism dispersion angle variation delta beta t, to determine the cylindrical lens deflection angle Zeta. The invention is mainly applied to the design and manufacture of optical instruments.

Description

technical field [0001] The invention belongs to the field of optical instrument design, and specifically relates to a design method and device of an echelle grating spectrometer based on a cylindrical lens with an astigmatism elimination. Background technique [0002] The échelle spectrometer is a high-resolution spectroscopic instrument, which consists of an échelle grating and a prism with a cross-dispersion structure to form a two-dimensional spectrum on the image plane, which is received by an area array CCD. It overcomes the disadvantages of traditional scanning grating spectrometers, such as cumbersome process of obtaining spectra and long test time. It has many functions such as large dynamic range, no moving parts, compact structure, and can realize transient direct-reading measurement of multi-element spectra. The number of pixels of the array CCD is much larger than that of the linear array CCD, so the échelle spectrometer can obtain spectral signals of a wide band...

Claims

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Application Information

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IPC IPC(8): G01J3/02G01J3/18G01J3/28
CPCG01J3/0297G01J3/1809G01J3/2823
Inventor 段发阶傅骁蒋佳佳黄婷婷马凌
Owner TIANJIN UNIV
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