Multichannel broadband high-resolution spectrograph

Patent metadata

Field	Value
Publication number	US-11268853-B2
Application number	US-202016932869-A
Country	US
Kind code	B2
Filing date	Jul 20, 2020
Priority date	Dec 18, 2019
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

The present invention discloses a multichannel broadband high-resolution spectrograph, comprising a plurality of light source incident slits, a multichannel integrated grating, a multichannel shared two-dimensional focus imaging mirror and a two-dimensional area array detector which are sequentially disposed along a light source incident or reflection line, wherein the multichannel integrated grating consists of a plurality of sub-gratings, incident light enters the corresponding integrated gratings along the light source incident slits and then is focused by the shared two-dimensional focus imaging mirror after diffraction of the integrated grating, and diffraction light in a full-spectrum region is incident onto a focal plane of the two-dimensional area array detector for detection. No any mechanical displacement part is disposed, multichannel, full-spectrum and high-speed detection and analysis is achieved, and the present disclosure has high spectrum resolution and working reliability.

First claim

What is claimed is:

1. A multichannel broadband high-resolution spectrograph, characterized by comprising a plurality of light source incident slits, a multichannel integrated grating, a multichannel shared two-dimensional focus imaging mirror and a two-dimensional area array detector which are sequentially disposed along a light source incident or reflection line, wherein the multichannel integrated grating consists of a plurality of sub-gratings;
each light source incident slit is used as a spectrum channel incident port, the sub-gratings are combined to form an independent integrated grating according to the number of spectrum channels, a light source enters a collimating mirror through the slits, a direction perpendicular to an incident surface is a y direction, each sub-grating is disposed along the y direction, and each sub-grating has the same diffraction angle range along an x direction in which diffraction wavelengths are distributed in the incident surface; and
incident light enters the corresponding integrated gratings along each light source incident slit and then is focused by the shared two-dimensional focus imaging mirror after diffraction of the integrated grating, and diffraction light in a full-spectrum region is incident onto a focal plane of the two-dimensional area array detector for detection.

2. The multichannel broadband high-resolution spectrograph according to claim 1 , characterized in that the total number of sub-gratings is n, the n sub-gratings is combined according to the number h of spectrum channels, the number of the sub-gratings included in each independent spectrum channel is k, and k=n/h.

3. The multichannel broadband high-resolution spectrograph according to claim 2 , characterized in that the number k of the sub-gratings in each channel depends on numberλ, of total broad spectrum regions and widthsΔλ k of sub wavelength regions, i.e., k=λ/Δλ k .

4. The multichannel broadband high-resolution spectrograph according to claim 3 , characterized in that a diffraction angle of each sub-grating along an x direction in which diffraction wavelengths are distributed in an incident plane is Δθ, i.e.,
Δθ 1 (Δλ 1 )=Δθ 2 (Δλ 2 )=. . .=Δλ k (Δλ n )  (1)

In the formula:
Δθ 1 =θ 2 −θ 1 ,Δθ 2 =θ 3 −θ 2 , . . . Δθ k =θ k+1 −θ k   (2)

Δλ 1 =λ 2 −λ 1 ,Δλ 2 =λ 3 −λ 2 , . . . Δλ k =λ k+1 −λ k   (3)

5. The multichannel broadband high-resolution spectrograph according to claim 4 , characterized in that normal directions of each sub-grating surface are combined and disposed according to a connecting sequence of each spectrum region.

6. The multichannel broadband high-resolution spectrograph according to claim 4 , characterized in that p pixels are included on a focal plane of the two-dimensional area array detector in an x direction in which diffraction wavelengths are distributed, the number p of the pixels coincides with the number of sub wavelengths corresponding to each sub-grating and conforming to requirement of high-resolution wavelength Δλ=Δλ k /p; y pixels are included in a y direction, the pixels in the y direction is divided to n regions in coincidence with the number of spectrum channels, a pixel region in each channel region being divided to k sub spectrum regions, the number of pixels of each sub spectrum region in the y direction is t, and t=q/n.

7. The multichannel broadband high-resolution spectrograph according to claim 1 , characterized in that the number of the light source incident slits is greater than or equal to 2, and widths of the light source incident slits is fixed or adjusted within a range from 0 millimeter to 2 millimeters.

8. The multichannel broadband high-resolution spectrograph according to claim 1 , characterized in that the two-dimensional focus imaging mirror is a bifocal tire reflecting mirror, the focal length along an x direction is f1 and along a y direction is f2, and diffraction light from a multichannel integrated grating is focused on a focal plane of a two-dimensional area array detector.

9. The multichannel broadband high-resolution spectrograph according to claim 1 , characterized in that a plurality of spherical mirrors in one-to-one correspondence to light source incident slits are further disposed between light source incident slits and a multichannel integrated grating, and a light source enters the light source incident slits and then is reflected by the spherical mirrors to form parallel light.

10. The multichannel broadband high-resolution spectrograph according to claim 9 , characterized in that a color filter is further disposed between the spherical mirrors and a multichannel integrated grating and used for filtering high-order diffraction light.

Assignees

• Univ Fudan

Inventors

• Chen Liangyao
• Wang Songyou
• Zhao Haibin
• Zheng Yuxiang
• Zhang Rongjun
• Yang Yuemei
• Chen Jianke
• Jiang Anqing

Classifications

• G01J3/18

  using diffraction elements, e.g. grating (gratings per se G02B) · CPC title

• G01J3/04 Primary

  Slit arrangements {slit adjustment} · CPC title

• G01J2003/2826

  Multispectral imaging, e.g. filter imaging · CPC title

• G01J3/0208 Primary

  using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction · CPC title

• G01J3/2803 Primary

  using photoelectric array detector · CPC title