CN202119532U - Low stray light double monochromator optical system - Google Patents
Low stray light double monochromator optical system Download PDFInfo
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- CN202119532U CN202119532U CN 201120196795 CN201120196795U CN202119532U CN 202119532 U CN202119532 U CN 202119532U CN 201120196795 CN201120196795 CN 201120196795 CN 201120196795 U CN201120196795 U CN 201120196795U CN 202119532 U CN202119532 U CN 202119532U
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Abstract
The utility model discloses a low stray light double monochromator optical system, comprising a first single monochromator optical system and a second single monochromator optical system, wherein the first single monochromator optical system and the second single monochromator optical system are serially connected, and an optical path of the first single monochromator optical system and/or that of the second single monochromator optical system are/is intersected. Because the system has two single monochromator optical systems, so resolution is high, and stray light is low. And because the optical path of at least one single monochromator optical system is intersected, so the structure is compact, size is small, and optical instruments, such as a spectrophotometer, using the system are small in size. Besides, because a light beam enters from an incident slit and is emitted from an emitting slit, so reflection frequency is low in the whole path, and thus, energy utilization rate of the low stray light double monochromator optical system is high.
Description
Technical field
The utility model relates to a kind of double monochromator optical system that is used for spectrophotometer or similar optical instrument.
Background technology
The monochromator optical system that is used for spectrophotometer or similar optical instrument can be divided into two types on structure: single monochromator optical system and the double monochromator optical system that is connected in series by two single monochromator optical systems.Be to realize the purpose than low stray light, most of spectrophotometers all adopt the double monochromator optical system, and this double monochromator optical system comprises that chromatic dispersion addition or chromatic dispersion subtract each other two kinds of forms.
Double monochromator optical system as shown in Figure 1, commonly used at present comprises two blocks of gratings, three slits and some catoptrons.Two blocks of gratings are respectively first grating 11, second grating, 12, the first gratings 11 are installed on two rotating mechanism (not shown)s with second grating, 12 symmetries (or parallel), need in the use to rotate synchronously simultaneously; Three slits are respectively entrance slit S1, middle slit S2 and exit slit S3; Some catoptrons comprise first catoptron 13, first collimator objective 14, first image-forming objective lens 15, second collimator objective 16, second image-forming objective lens 17, second catoptron 18.Wherein constitute first monochromator by first grating 11, entrance slit S1, first catoptron 13, first collimator objective 14, first image-forming objective lens 15 and middle slit S2; Constitute second monochromator by second grating 12, middle slit S2, second collimator objective 16, second image-forming objective lens 17, second catoptron 18 and exit slit S3.Two monochromator symmetric arrangement, and a shared middle slit S2.
Incident beam through entrance slit S1 reflexes on first collimator objective 14 through first catoptron 13; Reflex on first grating 11 by first collimator objective 14 again; The diffracted beam that light beam forms behind first grating, 11 diffraction is spectrum, and this spectrum reflexes near the middle slit S2 through first image-forming objective lens 15; The rotating driving device that starts first grating 11 makes it turn over a certain angle, stops at a certain ad-hoc location, and the monochromatic luminous energy that has only predetermined wavelength in this position is through middle slit S2, and the monochromatic light of other wavelength is blocked; Monochromatic light through middle slit S2 reflexes to second grating 12 diffraction once more by second collimator objective 16; Spectrum behind the diffraction reflexes to second catoptron 18 by second image-forming objective lens 17 once more, is exported by exit slit S3 by the purest part in the light beam after 18 reflections of second catoptron.
Above-mentioned double monochromator can be realized lower parasitic light, obtains higher optical resolution, and still, owing to be provided with the polylith catoptron in the optical system, physical construction is bigger, thereby causes using the instrument overall volume of this kind optical system huge.
As shown in Figure 2; Another kind of at present autocollimation double monochromator optical system commonly used; Comprise layout entrance slit S1, middle slit S2 and exit slit S3 at grade, and first grating 21, second grating 22, first catoptron 23, first collimator objective 24, second collimator objective 25 and second catoptron 26.Incident beam is incided on first collimator objective 24 by entrance slit S1 after 23 reflections of first catoptron; Through its collimation back reflection to first grating 21; Topknot is after the light beam behind the diffraction on first grating 21 is once more by first collimator objective, 24 collimations and reflection; Needed monochromatic light incides second collimator objective 25 through middle slit S2, and through second collimator objective 25 collimation back reflections diffraction once more to second grating 22, the light beam behind the diffraction is through second collimator objective, 25 collimations and reflection once more; Needed monochromatic light is reflected away by second catoptron 26 by exit slit S3 output again.
This kind autocollimation double monochromator can be realized high-resolution, and owing to include only a spot of catoptron, so physical construction is less relatively, adopts the instrument volume of this autocollimation double monochromator to reduce significantly.But well-known, the parasitic light index of this autocollimation double monochromator optical system is poor, and the lifting of this parasitic light index is limited.
The utility model content
The purpose of the utility model is the deficiency to above-mentioned prior art, provides a kind of in the low stray light double monochromator optical system of guaranteeing that resolution and volume are little.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
The described low stray light double monochromator of the utility model optical system; Comprise the first single monochromator optical system and the second single monochromator optical system that are serially connected, the light path in wherein said first single monochromator optical system and/or the second single monochromator optical system forms the intersection light path.
Said first single monochromator optical system comprises entrance slit, first collimator objective, first grating, first image-forming objective lens and middle slit, and said second single monochromator optical system comprises said middle slit, second collimator objective, second grating, second image-forming objective lens and exit slit; Said first single monochromator optical system and the shared said middle slit of said second single monochromator optical system; Incident beam is injected said first collimator objective through said entrance slit; The directional light that behind its collimation, forms incides said first grating to carry out diffraction and forms diffracted beam one time; Needed monochromatic light is after said first image-forming objective lens focuses in this diffracted beam; Incide said second collimator objective through said middle slit, the directional light that behind the said second collimator objective collimation, forms incides on said second grating, carries out diffraction once more and forms the secondary diffracted beam at this second grating; This secondary diffracted beam is after said second image-forming objective lens focuses on, by said exit slit output; Said incident beam forms said intersection light path from said entrance slit to the light path the said middle slit.
Said first single monochromator optical system comprises that also one is used to change first catoptron from the beam direction of said first image-forming objective lens ejaculation, and the light beam that is gone out by said first mirror reflects gets into said second single monochromator optical system through said middle slit.
Said second single monochromator optical system also comprises second catoptron that is used to receive the light beam that is passed through by said middle slit, and this second catoptron is with the beam reflection that is received to said second collimator objective.
Said first catoptron be arranged on said second catoptron directly over.
Described optical system also comprises at least one catoptron and/or the refracting telescope that is used to change optical path direction.
Can know from technique scheme; The advantage and the good effect of the low stray light double monochromator optical system of the utility model are: because the utility model low stray light double monochromator optical system comprises first single monochromator optical system and the second single monochromator optical system that is serially connected; Promptly form, so resolution is high, parasitic light is low by two single monochromators; Again since wherein the light path of at least one single monochromator optical system form to intersect light path, so compact conformation, volume are little, thereby make that the volume of the optical instruments such as spectrophotometer that adopt the utility model is little; In addition, because light beam is injected from entrance slit, penetrate from exit slit, the order of reflection in entire path is fewer, and therefore, the capacity usage ratio of the utility model is high.
With reference to the accompanying drawing description of a preferred embodiment, above-mentioned and other purpose of the utility model, feature and advantage will be more obvious through following.
Description of drawings
Fig. 1 is existing a kind of double monochromator optical system low stray light double monochromator optical system structure synoptic diagram;
Fig. 2 is existing autocollimation double monochromator optical system low stray light double monochromator optical system structure synoptic diagram;
Fig. 3 is the structural representation of the low stray light double monochromator optical system of the utility model first embodiment;
Fig. 4 is the structural representation of the low stray light double monochromator optical system of the utility model second embodiment;
Fig. 5 is the low stray light double monochromator optical system diagram that utilizes optics software simulation the utility model first embodiment;
The low stray light double monochromator optical system that Fig. 6 representes to utilize optics software simulation the utility model first embodiment is at the point range figure of wavelength during for 550nm;
The low stray light double monochromator optical system that Fig. 7 representes to utilize optics software simulation the utility model first embodiment is at the point range figure of wavelength during for 656.1nm.
Embodiment
To describe the specific embodiment of the utility model below in detail.Should be noted that the embodiments described herein only is used to illustrate, be not limited to the utility model.
The low stray light double monochromator optical system of the utility model comprises two single monochromator optical systems that are serially connected.The inventive concept of the utility model is that the light path in one of them single monochromator optical system forms the intersection light path, and another single monochromator optical system can be traditional CT light path; Perhaps the light path in two single monochromator optical systems all forms the intersection light path, so takes into account volume and resolution, the parasitic light index of whole double monochromator optical system.
As shown in Figure 3, the low stray light double monochromator optical system of the utility model first embodiment comprises the first single monochromator optical system and the second single monochromator optical system that are serially connected.
First single monochromator optical system comprises entrance slit S1, first collimator objective 34, first grating 31, first image-forming objective lens 35 and middle slit S2, and wherein the center of first grating 31, first collimator objective 34 and first image-forming objective lens 35 at grade; Second single monochromator optical system comprises middle slit S2, second collimator objective 36, second grating 32, second image-forming objective lens 37 and exit slit S3, and wherein the center of second collimator objective 36, second grating 32 and second image-forming objective lens 37 at grade; First single monochromator optical system and the shared middle slit S2 of second single monochromator optical system.Incident beam is injected first collimator objective 34 through entrance slit S1; The directional light that behind its collimation, forms incides first grating 31 to carry out diffraction and forms diffracted beam one time; Needed monochromatic light is after first image-forming objective lens 35 focuses in this diffracted beam; Incide second collimator objective 36 through middle slit S2, the directional light that behind second collimator objective, 36 collimations, forms incides on second grating 32, carries out diffraction once more and forms the secondary diffracted beam at this second grating 32; This secondary diffracted beam is exported by exit slit S3 after second image-forming objective lens 37 focuses on.Incident beam forms from entrance slit S1 to the light path the middle slit S2 and intersects light path: by entrance slit S1 to the light beam of first collimator objective 34 with intersect from the light beam of first grating, 31 to first image-forming objective lens 35, light beam from first image-forming objective lens 35 to middle slit S2; Intersect from the light beam of first collimator objective, 34 to first gratings 31 and light beam from first image-forming objective lens 35 to middle slit S2.Monochromatic light by exit slit S3 ejaculation; If can not directly arrive spectrophotometric sample cell; Then can pass through a series of catoptrons or refracting telescope; Perhaps the two uses simultaneously, through spectrophotometric sample cell, arrives receiver then and just can measure accordingly after the change direction.Certainly, in the present embodiment, also can in other positions of light path system one or more catoptron be set according to actual needs, to change optical path direction.
As shown in Figure 4, the low stray light double monochromator optical system of the utility model second embodiment, the difference of its structure and first embodiment is:
First single monochromator optical system also comprises one first catoptron 38, and it is used to change the beam direction that penetrates from first image-forming objective lens 35, and the light beam that is reflected by first catoptron 38 gets into second single monochromator optical system through middle slit S2.Like this, can adjust the relative position of two single monochromator optical systems easily according to actual needs.
In addition, second single monochromator optical system also comprises one second catoptron 39, and it is used to receive the light beam that is passed through by middle slit S2, and with beam reflection to the second collimator objective 36 that is received.Particularly; When first catoptron 38 be arranged on second catoptron 39 directly over the time; Then first single monochromator optical system and second single monochromator optical system spatially are arranged to upper and lower two-layer form, and this can reduce the volume of whole double monochromator optical system at horizontal direction significantly.
The portion that the low stray light double monochromator optical system of this second embodiment is identical with other structures of first embodiment is same, repeats no more here.
As shown in Figure 5, the light beam that is sent by light sources such as tungsten lamp or deuterium lamps is after condenser 40 converges, through entrance slit S1; Behind first collimator objective, 34 collimations, incide first grating 31; At first grating 31 diffraction takes place, one time diffracted beam passes through middle slit S2 after first image-forming objective lens 35 focuses on, again behind second collimator objective, 36 collimations; Incide second grating 32 diffraction once more, the secondary diffracted beam is exported by exit slit S3 after second image-forming objective lens 37 focuses on again.
Like Fig. 6, shown in Figure 7; Utilize the hot spot of low stray light double monochromator optical system when wavelength is respectively 550nm, 656.1nm of optical design software Zemax simulation the utility model first embodiment all very tiny; Therefore; The low stray light double monochromator optical system of the utility model can not only effectively reduce parasitic light, can reach higher resolution when in spectrophotometer, using simultaneously, and capacity usage ratio is high.
Though described the utility model with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.Because the utility model practical implementation and do not break away from the spirit or the essence of utility model in a variety of forms; So be to be understood that; The foregoing description is not limited to any aforesaid details; And should in enclose spirit that claim limited and scope, explain widely, therefore fall into whole variations and remodeling in claim or its equivalent scope and all should be the claim of enclosing and contain.
Claims (6)
1. low stray light double monochromator optical system; Comprise the first single monochromator optical system and the second single monochromator optical system that are serially connected; It is characterized in that the light path in said first single monochromator optical system and/or the second single monochromator optical system forms the intersection light path.
2. low stray light double monochromator optical system according to claim 1; It is characterized in that; Said first single monochromator optical system comprises entrance slit (S1), first collimator objective (34), first grating (31), first image-forming objective lens (35) and middle slit (S2), and said second single monochromator optical system comprises said middle slit (S2), second collimator objective (36), second grating (32), second image-forming objective lens (37) and exit slit (S3); The said first single monochromator optical system and the said second shared said middle slit of single monochromator optical system (S2); Incident beam is injected said first collimator objective (34) through said entrance slit (S1); The directional light that behind its collimation, forms incides said first grating (31) to carry out diffraction and forms diffracted beam one time; Needed monochromatic light is after said first image-forming objective lens (35) focuses in this diffracted beam; Incide said second collimator objective (36) through said middle slit (S2), the directional light that behind said second collimator objective (36) collimation, forms incides on said second grating (32), carries out diffraction once more and forms the secondary diffracted beam at this second grating (32); This secondary diffracted beam is exported by said exit slit (S3) after said second image-forming objective lens (37) focuses on; Said incident beam forms said intersection light path from said entrance slit (S1) to the light path the said middle slit (S2).
3. low stray light double monochromator optical system according to claim 2; It is characterized in that; Said first single monochromator optical system comprises that also is used for changing first catoptron (38) from the beam direction of said first image-forming objective lens (35) ejaculation, and the light beam that is reflected by said first catoptron (38) gets into said second single monochromator optical system through said middle slit (S2).
4. low stray light double monochromator optical system according to claim 3; It is characterized in that; Said second single monochromator optical system also comprises second catoptron (39) that is used for receiving the light beam that is passed through by said middle slit (S2), and this second catoptron (39) is with the beam reflection that is received to said second collimator objective (36).
5. low stray light double monochromator optical system according to claim 4 is characterized in that, said first catoptron (38) be arranged on said second catoptron (39) directly over.
6. according to each described low stray light double monochromator optical system of claim 1-5, it is characterized in that described optical system also comprises at least one catoptron and/or the refracting telescope that is used to change optical path direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120196795 CN202119532U (en) | 2011-06-13 | 2011-06-13 | Low stray light double monochromator optical system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201120196795 CN202119532U (en) | 2011-06-13 | 2011-06-13 | Low stray light double monochromator optical system |
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| CN202119532U true CN202119532U (en) | 2012-01-18 |
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| CN 201120196795 Expired - Lifetime CN202119532U (en) | 2011-06-13 | 2011-06-13 | Low stray light double monochromator optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954286A (en) * | 2016-05-26 | 2016-09-21 | 上海新产业光电技术有限公司 | Visibility measuring instrument based on rotary-light-filter monochromator |
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2011
- 2011-06-13 CN CN 201120196795 patent/CN202119532U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954286A (en) * | 2016-05-26 | 2016-09-21 | 上海新产业光电技术有限公司 | Visibility measuring instrument based on rotary-light-filter monochromator |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120118 |