CN101290292B - Multi-wavelength oct system - Google Patents
Multi-wavelength oct system Download PDFInfo
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- CN101290292B CN101290292B CN2008100535561A CN200810053556A CN101290292B CN 101290292 B CN101290292 B CN 101290292B CN 2008100535561 A CN2008100535561 A CN 2008100535561A CN 200810053556 A CN200810053556 A CN 200810053556A CN 101290292 B CN101290292 B CN 101290292B
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Abstract
The invention provides a dual-wavelength OCT system, which comprises light sources, optical couplers, optical wavelength division multiplexers, a reference arm, a sample arm, a detector, a preamplifier, an AD converter and a computer. The invention is characterized in that: the light sources with two wavelengths are respectively connected with respective optical couplers; the two optical couplers are respectively connected with two wavelength division multiplexers; light with the two wavelengths shares the two wavelength division multiplexers and the optical powers which enter into the reference arm and the sample arm are approximately the same. The system does not have the problem of non-uniform distribution of the light with different wavelengths by the optical couplers. Moreover, due to adoption of the wavelength division multiplexers, the system is simplified; the number of parts used is few; and the optical power consumption is low.
Description
Technical field
The invention belongs to the optical coherence tomography field, particularly the optical coherence tomography system of multi-functional multi-wavelength.
Background technology
In order to explore the life process that occurs in biological tissue inside, people wish as far as possible fast, accurately, clearly see its internal image, and the real-time tracing record is carried out in the variation that takes place.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.
Biological tissue is a kind of medium of high scattering, but light wave is existed absorption too.Especially wherein may there be optionally absorption and scattering in specific composition to the light of different wave length, so just formed the spectral response characteristic of biological tissue.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.As its name suggests, be exactly to adopt the light of a plurality of wavelength to carry out the research of OCT simultaneously, what wherein the researcher the most generally adopted is dual wavelength OCT technology.In the prior art, dual wavelength OCT system often as depicted in figs. 1 and 2
Dual wavelength OCT system shown in Figure 1 adopts wavelength-division multiplex (WDM, Wavelength Division Multiplexing) device at the light source place also photosynthetic with two wavelength, through behind same 2 * 2 coupling mechanisms, separate with the light of wavelength division multiplexer in detection place again two wavelength.Adopt wavelength division multiplexer can well simplify light path, effectively reduce the loss that optical device brings, but 2 * 2 photo-couplers are to the splitting ratio difference of different wavelengths of light, this has the more high-power reference arm of injecting with regard to the light that has caused a certain wavelength, and smaller power is injected sample arm, causes the waste of luminous power.
Dual wavelength OCT system shown in Figure 2 does not adopt wavelength division multiplexer to carry out beam split, but a plurality of 2 * 2 photo-coupler beam split have been adopted, the collimating apparatus parallel arranged of sample arm, sample arm is merged into a branch of light by the space beam splitter and is incident to sample, and a whole set of dual wavelength system is equivalent to the combinations of the single wavelength system of two covers.Though avoided luminous power to distribute uneven problem, the whole optical path complexity adopts more Passive Optical Components, optical power loss is serious, and is difficult for adjusting.
Summary of the invention
At said circumstances,, the present invention proposes a kind of dual wavelength OCT system for overcoming the deficiencies in the prior art.
Solution of the present invention is:
A kind of dual wavelength OCT system, it comprises light source, photo-coupler, light wavelength division multiplexing, reference arm, sample arm, detector, prime amplifier, AD converter and computing machine is characterized in that: the light source of two wavelength links to each other with separately photo-coupler respectively, and two photo-couplers link to each other with two light wavelength division multiplexings respectively, shared two light wavelength division multiplexings of the light of two wavelength, and it is roughly the same to enter the luminous power of reference arm and sample arm.
Dual wavelength OCT of the present invention system can be time domain or frequency domain OCT system.
Light source of the present invention is a wideband light source, can be SLD, femto-second laser or LED.
Detector of the present invention can be a photodiode, CCD or spectrometer.
Relative prior art, the light of the light source outgoing photo-coupler by separately respectively earlier then passes through wavelength division multiplexer respectively in the dual wavelength OCT of the present invention system.Compare with dual wavelength OCT system shown in Figure 1, light is different by the order of coupling mechanism and wavelength division multiplexer, photo-coupler can not appear to the uneven problem of the distribution of different wavelengths of light, and owing to adopt wavelength division multiplex device, make system simplification, the use optical passive component is few, and is little to optical power loss, is convenient to obtain the OCT image of higher sensitivity.
Description of drawings
Fig. 1 is existing dual wavelength OCT system example 1 structure principle chart.
Fig. 2 is existing dual wavelength OCT system example 2 structure principle charts
Fig. 3 is a dual wavelength OCT system architecture schematic diagram of the present invention.
Embodiment
In conjunction with the accompanying drawings, multi-wavelength OCT system of the present invention is described in detail as follows:
Dual wavelength OCT system architecture schematic diagram of the present invention as shown in Figure 3.Comprise: 980nmSLD wideband light source 1,980nm photo-coupler 2, the 980nm of reference arm and 1300nm light wavelength division multiplexing 3, reference arm 4, sample arm 5, the 980nm of sample arm and 1300nm light wavelength division multiplexing 6,1300nm photo-coupler 7,1300nm photodetector 8,1300nmSLD wideband light source 9,980nm photodetector 10, prime amplifier 11, AD converter 12, computing machine 13.
2 * 2 photo-couplers that the light of 980nmSLD wideband light source 1 and 9 outgoing of 1300nmSLD wideband light source is injected respectively separately are that 980nm photo-coupler 2 and 1300nm photo-coupler 7 carry out beam split, and being divided into four road light is two-way 980nm light and the outgoing of two-way 1300nm light.Inject the 980nm of sample arm and the 980nm and the 1300nm light wavelength division multiplexing 3 of 1300nm light wavelength division multiplexing 6 and reference arm then respectively.The light wavelength division multiplexing 6 of sample arm and the light wavelength division multiplexing 3 of reference arm are respectively with the photosynthetic of two wavelength and and export sample arm 5 and reference arm 4 to.According to the light path principle of reversibility, the light that returns from sample arm 5 and reference arm 4 is after light wavelength division multiplexing 6 and light wavelength division multiplexing 3 beam split, the light that is divided into 980nm and 1300nm, injecting separately, the coupling mechanism of wavelength is 980nm photo-coupler 2 and 1300nm photo-coupler 7, is that 1300nm photodetector 8 and 980nm photodetector 10 are surveyed and be converted to electric signal from the light of coupling mechanism outgoing by separately detector, after prime amplifier 11 carries out signal Processing, be that digital signal is imported computing machine into and handled and obtain required result with analog signal conversion through AD converter.
Claims (4)
1. dual wavelength OCT system, comprise light source, photo-coupler, light wavelength division multiplexing, reference arm, sample arm, detector, prime amplifier, AD converter and computing machine, it is characterized in that: different two light sources of wavelength link to each other with separately 2 * 2 photo-couplers respectively, and two light wavelength division multiplexings lay respectively on sample arm and the reference arm, and all link to each other with above-mentioned two 2 * 2 photo-couplers separately, the light wavelength division multiplexing of sample arm and the light wavelength division multiplexing of reference arm respectively with the photosynthetic of two wavelength and and export sample arm and reference arm to, and the luminous power that enters reference arm and sample arm is roughly the same, and the light that returns from sample arm and reference arm is divided into two original optical wavelength after above-mentioned two light wavelength division multiplexing beam split, inject 2 * 2 photo-couplers of wavelength separately, be converted to electric signal from the light quilt detector detection separately of coupling mechanism outgoing, after prime amplifier carries out signal Processing, import computing machine into through AD converter and handle.
2. dual wavelength OCT as claimed in claim 1 system is characterized in that, described dual wavelength OCT system can be time domain or frequency domain OCT system.
3. dual wavelength OCT as claimed in claim 1 system is characterized in that described light source is a wideband light source, can be SLD, femto-second laser or LED.
4. dual wavelength OCT as claimed in claim 1 system is characterized in that described detector can be a photodiode, CCD or spectrometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100535561A CN101290292B (en) | 2008-06-18 | 2008-06-18 | Multi-wavelength oct system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100535561A CN101290292B (en) | 2008-06-18 | 2008-06-18 | Multi-wavelength oct system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101290292A CN101290292A (en) | 2008-10-22 |
| CN101290292B true CN101290292B (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100535561A Expired - Fee Related CN101290292B (en) | 2008-06-18 | 2008-06-18 | Multi-wavelength oct system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112587080A (en) * | 2020-12-08 | 2021-04-02 | 苏州大学 | Visible light and near infrared light dual-band optical coherence tomography imaging system |
| CN112704470B (en) * | 2020-12-22 | 2022-03-15 | 电子科技大学 | Spectrum-splitting frequency domain coherence tomography system |
| CN113804651B (en) * | 2021-09-17 | 2023-08-08 | 南京森林警察学院 | Lens refractive index measuring device and method based on multi-wavelength astigmatic probe |
| CN114217379B (en) * | 2021-12-14 | 2022-07-26 | 湖南卡睿知医疗科技有限公司 | Optical fiber module and system special for OCT (optical coherence tomography) |
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