CN101354477A - Focusing lens for dual-wavelength OCT system - Google Patents
Focusing lens for dual-wavelength OCT system Download PDFInfo
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- CN101354477A CN101354477A CNA2008100535576A CN200810053557A CN101354477A CN 101354477 A CN101354477 A CN 101354477A CN A2008100535576 A CNA2008100535576 A CN A2008100535576A CN 200810053557 A CN200810053557 A CN 200810053557A CN 101354477 A CN101354477 A CN 101354477A
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Abstract
The invention relates to an amasthenic lens used for a dual wavelength OCT system. The amasthenic lens carries out excellent correction of image differences such as ball difference, can obtain small facula and effectively improves the resolution of the OCT system; more importantly, the amasthenic lens excellently corrects the colour difference and can be used for the OCT system detection imaging of dual wavelength or multi-wavelength. The amasthenic lens has the advantages of simple structure, low cost, small image difference and clear imaging.
Description
Technical field
The invention belongs to the optical lens technical field, particularly be used for the amasthenic lens of dual wavelength OCT system.
Background technology
OCT (Optical Coherence Tomography, optical coherence tomography) is a kind of harmless chromatography imaging technique based on interferometry, combine the advantage of relevant gate technique and space gate technique, effectively the irrelevant various parasitic lights of filtering and flashlight become a kind of very promising image-forming diagnose technology.Adopt the light of different wave length that biological tissue is carried out OCT and survey, parameters such as the image of acquisition and investigation depth may be different.Utilize the spectral characteristic of OCT technical research biological tissue, just formed a kind of new function OCT technology---the wavelength OCT technology of being correlated with.The multi-wavelength OCT technology is a kind of of the relevant OCT technology of wavelength, and what wherein the researcher the most generally adopted is dual wavelength OCT technology.
The lateral resolution of OCT system depends primarily on the size that focuses on the hot spot on the biological tissue samples.If the focusing performance of lens combination is good, we just can be converged to very little hot spot at sample and catoptron with the laser of dispersing from optical fiber, thereby so just can obtain the resolution of walking crosswise that interference image in biological tissue's scope of trying one's best little improves system.For single wavelength OCT system, because there are the various aberrations except that aberration in amasthenic lens, can reduce the resolution of system, make the image quality decrease that obtains, this just needs our the well various aberrations of corrections except that aberration.
For dual wavelength OCT system, at the sample arm end of system, the light of two wavelength need use same light path, measures when could realize two wavelength to the sample same position.For obtaining the relevant information of wavelength accurately of sample, the sample arm condenser lens need focus to same position with different light, in general the interval of two wavelength is bigger, and the light source of OCT system is wideband light source, so just need be in the correction of the basic enterprising circumstances in which people get things ready for a trip difference of single wavelength OCT system.The condenser lens of sample arm is different for the focal length of different wave length laser, use the single lens can not be with the laser convergence of two wavelength to same position, just can not obtain the hot spot of the minimum of two kinds of laser at same position simultaneously, so just lose the meaning that adopts the laser of two wavelength simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of amasthenic lens that is used for dual wavelength OCT system.It has carried out good correction to aberrations such as spherical aberrations, can obtain less hot spot, has improved the resolution of OCT system effectively, the more important thing is, it has also carried out proofreading and correct preferably to aberration, and the OCT system that can be used for dual wavelength and even multi-wavelength surveys imaging.It is simple in structure, and cost is low, and aberration is little, and imaging is clear.
Solution of the present invention is: a kind of amasthenic lens that is used for dual wavelength OCT system.
This camera lens comprises two cemented doublets, is followed successively by from the light incident direction: meniscus 1, convex lens 2, convex lens 3, meniscus 4, each lens arrangement is on an axis.
In described camera lens, can use the optical glass material of two kinds of different models, model is F2 type, BK7 type.The optical glass model of each lens: meniscus 1 is the F2 type, and convex lens 2 are the BK7 type, and convex lens 3 are the BK7 type, and meniscus 4 is the F2 type.
Description of drawings
Fig. 1 is one embodiment of the invention structural representations.
Fig. 2 is the spatial frequency curve map of one embodiment of the invention.
Fig. 3 is the energy distribution synoptic diagram of the focal spot of one embodiment of the invention.
Embodiment
Further specify the present invention below in conjunction with drawings and Examples.
Two wavelength are to the simultaneously-measured requirement of the same position of sample in the dual wavelength OCT system in order to satisfy, and we must carry out special processing design to the sample arm amasthenic lens of dual wavelength OCT system.The present invention carries out the special invention design of the sample arm amasthenic lens of dual wavelength OCT system just at above application requirements, and this camera lens can be applicable to dual wavelength OCT system and even multi-wavelength OCT system.
The principle of ray tracing is adopted in the design of amasthenic lens of the present invention, thickness by changing eyeglass and between spacing, the material of eyeglass, and carry out optimal design, with the quantity of minimizing eyeglass and the quantity of materials used, obtain the good focusing effect with minimum cost.
Fig. 1 is one embodiment of the invention structural representation, is made up of 4 lens, comprises two cemented doublets.Be followed successively by from the light incident direction: meniscus 1, convex lens 2, convex lens 3, meniscus 4, each lens arrangement is on an axis.The left end of eyeglass 1 is OCT system sample arm optical fiber emergent light position among the figure, and the right of eyeglass 4 is a focal position.The lens focus of the emergent light process embodiment of the invention of OCT system sample arm optical fiber is in sample.
One embodiment of the invention total length is 60mm (millimeter), diameter 10mm (millimeter), and operating distance 14mm (millimeter), resolution is less than 20um (micron), and optical fiber emergent light wavelength is respectively 980nm and 1300nm.Its role is to: (1) focuses in the sample (2) with the light of optical fiber outgoing and collects the back-scattering light of sample and return and focus to fiber end face.
The material of camera lens adopts two kinds of optical glass materials commonly used, and the corresponding glass trade mark is respectively F2, BK7.The material sequences of camera lens is F2 → BK7 → BK7 → F2.
In a preferred embodiment of amasthenic lens of the present invention, the specific design size that each eyeglass adopted and arrange (unit: millimeter) as shown in the table.The variation range of following physical dimension is ± 0.02mm (millimeter).
Sequence number radius-of-curvature summit, camera lens surface spacing material surface radius
1 22.15 7.64 F2 5
2 7.74 5.54 BK7 5
3-10.16 20 air 5
4 16.18 5.54 BK7 5
5 -7.74 7.64 F2 5
6-22.15 14.07 air 5
Fig. 2 is the spatial frequency curve map of one embodiment of the invention.Transverse axis is a spatial frequency among the figure, and the longitudinal axis is the amplitude of optical transfer function.Be 30 lines to locating in spatial frequency among the figure, during 17 microns of corresponding object space resolution, the amplitude of optical transfer function is greater than 0.3.
Fig. 3 is the energy distribution synoptic diagram of the focal spot of one embodiment of the invention.Transverse axis is a spot radius among the figure, and the longitudinal axis is a relative intensity.Be in 10 microns at radius among the figure, the energy of focal spot is greater than 50%.
By adopting the amasthenic lens of the special invention design of above method, satisfied of the specific (special) requirements of dual wavelength OCT system to amasthenic lens.
Claims (4)
1, a kind of amasthenic lens that is used for dual wavelength OCT system is characterized in that, this camera lens comprises two cemented doublets, is followed successively by from the light incident direction: meniscus 1, convex lens 2, convex lens 3, meniscus 4, each lens arrangement is on an axis.
2, amasthenic lens according to claim 1 is characterized in that, uses the optical glass material of two kinds of different models, model is F2 type, BK7 type, the optical glass model of each lens: meniscus 1 is the F2 type, and convex lens 2 are the BK7 type, convex lens 3 are the BK7 type, and meniscus 4 is the F2 type.
3, amasthenic lens according to claim 1 is characterized in that, total length is 60mm (millimeter), diameter 10mm (millimeter), and operating distance 14mm (millimeter), resolution is less than 20um (micron), and lambda1-wavelength is respectively 980nm and 1300nm.
4, amasthenic lens according to claim 1 is characterized in that, the specific design size that each eyeglass adopted and arrange (unit: millimeter) as shown in the table, and the variation range of following physical dimension is ± 0.02mm (millimeter).
Sequence number radius-of-curvature summit, camera lens surface spacing material surface radius
122.15 7.64 F2 5
27.74 5.54 BK7 5
3-10.16 20 air 5
416.18 5.54 BK7 5
5-7.74 7.64 F2 5
6-22.15 14.07 air 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100535576A CN101354477A (en) | 2008-06-18 | 2008-06-18 | Focusing lens for dual-wavelength OCT system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100535576A CN101354477A (en) | 2008-06-18 | 2008-06-18 | Focusing lens for dual-wavelength OCT system |
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| Publication Number | Publication Date |
|---|---|
| CN101354477A true CN101354477A (en) | 2009-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100535576A Pending CN101354477A (en) | 2008-06-18 | 2008-06-18 | Focusing lens for dual-wavelength OCT system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589191A (en) * | 2016-02-03 | 2016-05-18 | 中国科学院云南天文台 | Focusing camera used for adjusting co-focusing of astronomical telescope system and focusing method thereof |
| CN108279491A (en) * | 2018-04-19 | 2018-07-13 | 长春理工大学 | A kind of long reach, high-resolution videomicroscopy for biology observation |
| CN109561931A (en) * | 2016-08-09 | 2019-04-02 | 皇家飞利浦有限公司 | Skin-treatment device based on light |
-
2008
- 2008-06-18 CN CNA2008100535576A patent/CN101354477A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589191A (en) * | 2016-02-03 | 2016-05-18 | 中国科学院云南天文台 | Focusing camera used for adjusting co-focusing of astronomical telescope system and focusing method thereof |
| CN105589191B (en) * | 2016-02-03 | 2018-04-17 | 中国科学院云南天文台 | The focus cameras and its focus adjustment method confocal for adjusting astronomical telescope system |
| CN109561931A (en) * | 2016-08-09 | 2019-04-02 | 皇家飞利浦有限公司 | Skin-treatment device based on light |
| CN109561931B (en) * | 2016-08-09 | 2022-06-14 | 皇家飞利浦有限公司 | Light-based skin treatment device |
| CN108279491A (en) * | 2018-04-19 | 2018-07-13 | 长春理工大学 | A kind of long reach, high-resolution videomicroscopy for biology observation |
| CN108279491B (en) * | 2018-04-19 | 2024-04-16 | 长春理工大学 | Long working distance and high resolution video microscope for biological observation |
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Open date: 20090128 |