CN111678598B - Dyson curved surface prism spectral imaging system - Google Patents
Dyson curved surface prism spectral imaging system Download PDFInfo
- Publication number
- CN111678598B CN111678598B CN202010506472.XA CN202010506472A CN111678598B CN 111678598 B CN111678598 B CN 111678598B CN 202010506472 A CN202010506472 A CN 202010506472A CN 111678598 B CN111678598 B CN 111678598B
- Authority
- CN
- China
- Prior art keywords
- prism
- curved surface
- curved
- lens
- dyson
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000701 chemical imaging Methods 0.000 title claims abstract description 19
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 238000003384 imaging method Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 abstract description 10
- 230000003595 spectral effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J2003/1208—Prism and grating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
- G01J2003/2826—Multispectral imaging, e.g. filter imaging
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention discloses a Dyson curved surface prism spectral imaging system which comprises a slit, a Dyson lens, a convex lens, a concave lens, a first curved surface prism, a second curved surface prism and a detector, wherein the convex lens and the concave lens are positioned between the Dyson lens and the first curved surface prism; the front and back surfaces of the first curved surface prism and the second curved surface prism are spherical surfaces, but the optical axes are not on the same straight line, the two curved surface prisms have different refractive index Abbe numbers, and the inclined directions of included angles are different; the back surface of the second curved surface prism is used as an aperture diaphragm of the whole system, and a reflecting film layer is plated on the whole back surface. The system can realize wide spectrum, large field of view and high resolution, and simultaneously realize high signal-to-noise ratio and compact volume which is easy to assemble and adjust.
Description
Technical Field
The invention relates to the technical field of hyperspectral imaging, in particular to a Dyson curved prism spectral imaging system.
Background
The hyperspectral imaging technology is a new generation aerospace aviation optical remote sensing technology developed on the basis of multispectral remote sensing technology, can obtain space and spectrum information of a target at the same time with high resolution, a hyperspectral imager generally consists of a front mirror system, a slit and a spectrum imaging system, the current hyperspectral imaging equipment is developing towards the direction of large field of view, wide spectrum, high resolution and miniaturization, the current common hyperspectral imaging technical scheme comprises Czerny-Turner, offner, dyson and the like, and particularly:
1) The Czerny-Turner spectrometer adopts a plane grating as a light splitting element, but has the defects that the large residual astigmatism is difficult to effectively correct, and the F number cannot be small enough;
2) The Offner spectrometer uses the convex grating as a light splitting element and has good imaging performance, but the convex grating is difficult to manufacture and high in cost. Also the F-number of the Offner spectrometer cannot be made very small, usually the F-number of 2.5 is already a limit.
3) The Dyson spectral imaging system consists of a Dyson lens and a concave grating, the concave grating is used as a light splitting element in the prior art, the spherical surface of the Dyson lens is concentric with the concave grating, the problem of stray light caused by high-grade diffraction light of the diffraction grating of the Dyson spectrometer can seriously affect the comprehensive quality of the system, and the signal-to-noise ratio of the system is reduced to a certain extent due to energy loss caused by diffraction of the grating.
Disclosure of Invention
The invention aims to provide a Dyson curved prism spectral imaging system which can realize a wide spectrum band, a large field of view and high resolution, and simultaneously realize high signal-to-noise ratio and compact volume which is easy to adjust.
The purpose of the invention is realized by the following technical scheme:
a Dyson curved prism spectral imaging system, the system comprising a slit, a Dyson lens, a convex lens, a concave lens, a first curved prism, a second curved prism, and a detector, wherein:
the convex lens and the concave lens are positioned between the Dyson lens and the first curved prism;
the front and back surfaces of the first curved surface prism and the second curved surface prism are spherical surfaces, but the optical axes are not on the same straight line, the two curved surface prisms have different refractive index Abbe numbers, and the inclined directions of included angles are different;
the rear surface of the second curved surface prism is used as an aperture diaphragm of the whole system, and a reflecting film layer is plated on the whole rear surface;
in the imaging process: the light beam of the detection target collected by the front mirror passes through the slit and then sequentially enters the Dyson lens, the convex lens, the concave lens, the first curved surface prism and the second curved surface prism; and after the light beam is reflected by the reflecting film coated on the rear surface of the second curved prism, the light beam sequentially passes through the second curved prism, the first curved prism, the concave lens, the convex lens and the Dyson lens and finally forms an image on the detector.
The technical scheme provided by the invention shows that the system can realize a compact volume with high signal-to-noise ratio and easy assembly and adjustment while realizing wide spectrum, large field of view and high resolution, and improves the performance and the practicability of the spectral imaging system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic overall structure diagram of a Dyson curved prism spectral imaging system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a Dyson curved prism spectral imaging system according to an example of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an overall structural schematic diagram of a Dyson curved prism spectral imaging system provided by the embodiment of the present invention is further described in detail below with reference to the accompanying drawings, where the system mainly includes a slit 101, a Dyson lens 102, a convex lens 103, a concave lens 104, a first curved prism 105, a second curved prism 106, and a detector 107, where:
the convex lens 103 and the concave lens 104 are positioned between the Dyson lens 102 and the first curved prism 105; the focal power of the system can be optimized through the design of the convex lens 103 and the concave lens 104, the distance between an incident slit, an image plane and the Dyson lens is increased, and the adjustment test of the system is easy;
the front and back surfaces of the first curved surface prism 105 and the second curved surface prism 106 are spherical surfaces, but the optical axes are not on the same straight line, the two curved surface prisms have different refractive index abbe numbers, and the included angles are different in the inclination directions; therefore, when the light passes through the first curved surface prism 105 and the second curved surface prism 106, the light can generate dispersion effect, and the incident light with the compound color with certain bandwidth is dispersed;
because the spectral imaging system based on the curved surface prism generally has obvious dispersion nonlinearity problem, which is determined by the refractive index characteristics of optical materials, for example, for common optical materials, the refractive index of glass changes very fast in the short wave range of visible light, but changes slowly in the long wave range, and under the condition of no nonlinear correction, the spectral resolution in the equally spaced short wave range and long wave range is greatly different, the signal-to-noise ratio of the system is seriously influenced, and the subsequent data processing and calculation are inconvenient, so that the embodiment of the application adopts the combination of two curved surface prisms with different refractive index abbe numbers and different included angle inclination directions, thereby obtaining the optimal parameter value of the curved surface prism for correcting the nonlinearity to correct the nonlinearity of the spectrum;
the rear surface of the second curved prism 106 is used as an aperture diaphragm of the whole system, and a reflecting film layer is plated on the whole rear surface;
specifically, in the imaging process: firstly, a light beam of a detection target collected by a front mirror passes through the slit 101 and then sequentially enters the Dyson lens 102, the convex lens 103, the concave lens 104, the first curved prism 105 and the second curved prism 106; and after being reflected by the reflection film layer plated on the rear surface of the second curved prism 106, the light beam sequentially passes through the second curved prism 106, the first curved prism 105, the concave lens 104, the convex lens 103 and the Dyson lens 102, and is finally imaged on the detector 107.
In a specific implementation, the refractive index abbe numbers of the first curved surface prism 105 and the second curved surface prism 106 are respectively:
| refractive index | Abbe number | |
| First |
1.806 | 41.02 |
| Second |
1.761 | 26.56 |
The inclined directions of the included angles are respectively as follows:
the first curved surface prism 105 is in an angle of +12 to 28 degrees; the second curved surface prism 106 is-2 to-25 degrees.
The front lens can be a telescope or a microscope objective.
The following describes the working process and effect of the above system in detail by using a specific example, in this example, the system parameters are: the spectral range reaches 400-900nm, covers visible light to near-infrared band, the slit length is 22mm, the f number is 1.8, the pixel size is 11 μm, as shown in fig. 2, which is a schematic diagram of a Dyson curved prism spectral imaging system as an example of the present invention, with reference to fig. 2:
incident light enters the Dyson lens and the two spherical lenses through the slit and then reaches the two curved prisms 1 and 2 which are opposite in direction and different in material, light beams with different wavelengths are dispersed in the direction vertical to the slit due to included angles between the front surface and the rear surface of the curved prisms and the optical axis, an aperture diaphragm of the whole spectrum system is arranged on the rear surface of the second curved prism (Frey prism 2 in the graph 2), and a reflection film layer is plated on the whole rear surface;
the light beam finally reaches the detector image surface for convergence after passing through the two curved surface prisms, the two spherical lenses and the Dyson lens again after being reflected, at the moment, the distance between the image surface and the Dyson lens reaches 32.9mm, the distance between the incident slit and the Dyson lens reaches 36.9mm, and the distance between the image surface and the perpendicular direction of the incident slit is 18mm, so that sufficient space is provided for the installation of the incident slit and the detector, and the installation and debugging of the whole system are facilitated.
The work debugging result of the system shows that the color dispersion in the wavelength range of 400nm to 900nm is 1mm long, the spectral resolution at the long wave of 900nm is less than 10nm, the spectral resolution at the central wavelength of 650nm is less than 7nm, and the spectral resolution at the short wave of 400nm is less than 5nm. And the RMS diameter of the diffuse spot formed by the light after passing through the optical system is within 11 μm, which shows that the geometric aberration is basically corrected, and meanwhile, the MTF curve of each monochromatic light can be known as follows: MTF values of the system at the corresponding spatial sampling frequency of 46lp/mm are all above 0.5 in the full field of view, and the imaging quality is good.
It is noted that the embodiments of the present invention not described in detail belong to the prior art known to those skilled in the art, for example, different curved prism forms are adopted.
In summary, the embodiment of the present application adopts the curved surface prism to replace the concave surface grating as the light splitting element of the spectrum system, so that on one hand, the problems of energy loss and stray light caused by grating diffraction are eliminated; on the other hand, the nonlinear problem of the spectrum is corrected by optimally designing the shapes and materials of the two curved surface prisms.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. The Dyson curved prism spectral imaging system is characterized by comprising a slit, a Dyson lens, a convex lens, a concave lens, a first curved prism, a second curved prism and a detector, wherein:
the convex lens and the concave lens are positioned between the Dyson lens and the first curved prism;
the front and back surfaces of the first curved surface prism and the second curved surface prism are spherical surfaces, but the optical axes are not on the same straight line, the two curved surface prisms have different refractive index Abbe numbers, and the inclined directions of included angles are different;
the rear surface of the second curved surface prism is used as an aperture diaphragm of the whole system, and a reflecting film layer is plated on the whole rear surface;
wherein, the refractive index Abbe number of the first curved surface prism and the refractive index Abbe number of the second curved surface prism are respectively as follows:
The included angle inclination directions are respectively as follows:
the first curved surface prism is in an angle of + 12-28 degrees; the second curved surface prism is-2 to-25 degrees;
in the imaging process: the light beam of the detection target collected by the front mirror passes through the slit and then sequentially enters the Dyson lens, the convex lens, the concave lens, the first curved surface prism and the second curved surface prism; and after the light beam is reflected by the reflecting film coated on the rear surface of the second curved prism, the light beam sequentially passes through the second curved prism, the first curved prism, the concave lens, the convex lens and the Dyson lens and finally forms an image on the detector.
2. The Dyson curved prism spectral imaging system of claim 1,
the adopted front lens is a telescope or a microscope objective.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010506472.XA CN111678598B (en) | 2020-06-05 | 2020-06-05 | Dyson curved surface prism spectral imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010506472.XA CN111678598B (en) | 2020-06-05 | 2020-06-05 | Dyson curved surface prism spectral imaging system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111678598A CN111678598A (en) | 2020-09-18 |
| CN111678598B true CN111678598B (en) | 2023-02-24 |
Family
ID=72435036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010506472.XA Active CN111678598B (en) | 2020-06-05 | 2020-06-05 | Dyson curved surface prism spectral imaging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111678598B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489611A (en) * | 2018-02-09 | 2018-09-04 | 中国科学院长春光学精密机械与物理研究所 | More slotted prism dispersive spectrometer systems |
| CN110646091A (en) * | 2019-10-08 | 2020-01-03 | 中国科学院光电研究院 | Large-view-field Dyson spectral imaging system adopting free-form surface |
| CN110672206A (en) * | 2019-09-30 | 2020-01-10 | 中国海洋大学 | Double-slit curved prism chromatic dispersion ultra-large field of view spectrometer optical system |
| CN110879104A (en) * | 2019-11-11 | 2020-03-13 | 中国科学院上海技术物理研究所 | Optical system of long slit spectrometer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7609381B2 (en) * | 2008-03-20 | 2009-10-27 | The Aerospace Corporation | Compact, high-throughput spectrometer apparatus for hyperspectral remote sensing |
| FR2938059B1 (en) * | 2008-11-03 | 2011-03-11 | Horiba Jobin Yvon Sas | DYSON-TYPE IMAGER SPECTROMETER OF ENHANCED IMAGE QUALITY AND LOW DISTORTION. |
| CN102971655B (en) * | 2010-05-18 | 2015-08-05 | Itres研究有限公司 | For the small light transmission system of image relay device, hyperspectral imager and spectrograph |
-
2020
- 2020-06-05 CN CN202010506472.XA patent/CN111678598B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489611A (en) * | 2018-02-09 | 2018-09-04 | 中国科学院长春光学精密机械与物理研究所 | More slotted prism dispersive spectrometer systems |
| CN110672206A (en) * | 2019-09-30 | 2020-01-10 | 中国海洋大学 | Double-slit curved prism chromatic dispersion ultra-large field of view spectrometer optical system |
| CN110646091A (en) * | 2019-10-08 | 2020-01-03 | 中国科学院光电研究院 | Large-view-field Dyson spectral imaging system adopting free-form surface |
| CN110879104A (en) * | 2019-11-11 | 2020-03-13 | 中国科学院上海技术物理研究所 | Optical system of long slit spectrometer |
Non-Patent Citations (3)
| Title |
|---|
| Optical system design of the Dyson imaging spectrometer based on the Fery prism;Linlin Pei等;《OPTICAL REVIEW》;20160705;第23卷;第695-702页 * |
| 光谱成像仪同心光学系统设计与优化研究;杨晋;《中国优秀博硕士学位论文全文数据库（硕士）工程科技II辑》;20140615(第06期);第40页第2段-第41页第1段，第66页倒数第2段-第68页最后一段，第71页最后两段、表3.5，图3.17，4.30 * |
| 红外成像光谱测量中Dyson光学系统的研究进展;刘玉娟等;《光谱学与光谱分析》;20120229;第32卷(第2期);第548-552页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111678598A (en) | 2020-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9651763B2 (en) | Co-aperture broadband infrared optical system | |
| US8411268B2 (en) | Two material achromatic prism | |
| US8488237B2 (en) | Wide spectral coverage Ross corrected Cassegrain-like telescope | |
| CN112229516A (en) | Spectroscopic imaging system for snapshot type imaging spectrometer and imaging method thereof | |
| CN108489611B (en) | Multi-slit prism dispersion spectrometer system | |
| CN103411670B (en) | A kind of Novel prism dispersion imaging spectrometer | |
| CN111522132B (en) | Visible light near-infrared wide-spectrum apochromatic image telecentric lens and application thereof | |
| CN106441578B (en) | The airborne big visual field Hyperspectral imager of integration based on optical fiber and F é ry prisms | |
| CN104406691B (en) | A kind of imaging spectrometer beam splitting system based on single free form surface | |
| CN110146166B (en) | Spectrum light splitting system of free-form surface prism | |
| CN111678598B (en) | Dyson curved surface prism spectral imaging system | |
| CN114280764B (en) | Free-form surface prism-based large-view-field spectroscopic imaging method and system | |
| CN211824764U (en) | Medium-and long-wave thermal infrared double-spectrum band non-refrigeration type imaging device | |
| CN111854950A (en) | Optical system of multi-time image surface spectrometer | |
| CN216526504U (en) | Large-view-field spectroscopic imaging system based on free-form surface prism | |
| CN214667265U (en) | Imaging spectrometer containing free-form surface | |
| CN219996351U (en) | Prism-type spectroscopic imaging system for snapshot-type spectrum imager | |
| CN219455309U (en) | Spectral imaging system suitable for snapshot imaging spectrometer | |
| CN217181328U (en) | Spectroscopic imaging system for snapshot type imaging spectrometer | |
| CN218955917U (en) | Snapshot type wynne-offner type spectroscopic imaging system | |
| CN110081976A (en) | A kind of big visual field grating prism spectrum imaging system | |
| CN117824833A (en) | Spectral imaging method for integral field spectrum imager | |
| Gao et al. | Optical system design of imaging spectrometer with large aperture and high resolution | |
| CN219996349U (en) | Ultra-long slit imaging spectrum system | |
| CN217179764U (en) | Catadioptric spectroscopic imaging system for push-broom type imaging spectrometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |