CN203828901U - Spectrometer for frequency domain OCT system - Google Patents
Spectrometer for frequency domain OCT system Download PDFInfo
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- CN203828901U CN203828901U CN201420058992.9U CN201420058992U CN203828901U CN 203828901 U CN203828901 U CN 203828901U CN 201420058992 U CN201420058992 U CN 201420058992U CN 203828901 U CN203828901 U CN 203828901U
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- balzed grating
- spectrogrph
- achromat
- mode fiber
- grating
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Abstract
A spectrometer for a frequency domain OCT system comprises a single mode fiber, an achromatic lens, a blazed grating, a photoelectric detector and a spectrometer bottom board. The single mode fiber, the achromatic lens, the blazed grating and the photoelectric detector are all fixed to the spectrometer bottom board. Interference light of the OCT system is input to the single mode fiber, output light of the single mode fiber irradiates the blazed grating after being collimated by the achromatic lens, and first level diffraction light of a diffraction grating is focused by the same achromatic lens and then detected by the photosensitive detector. The spectrometer is simple and compact in structure, collimation of incident light and focusing of the first level diffraction light of the diffraction grating can be achieved at the same time through the same achromatic lens, and the miniaturization of the frequency domain OCT system is facilitated.
Description
Technical field
This utility model relates to spectrogrph, particularly a kind of spectrogrph for frequency domain OCT system.
Background technology
Optical coherent chromatographic imaging (Optical Coherence Tomography, OCT) is a kind of non-intruding high-resolution chromatography imaging technique based on low-coherent light interferometry, in fields such as vivo biological tissue imaging, sub-surface nondestructive detections, is widely used.Time domain OCT is the OCT technology putting forward the earliest, and the frequency domain OCT growing up is afterwards having greater advantage with respect to time domain OCT aspect image taking speed and sensitivity, be the developing direction of OCT technology.Frequency domain OCT system and time domain OCT system are all based on low-coherent light principle of interference, difference is on the detection mode of interference signal: time domain OCT is surveyed interference signal in time domain, frequency domain OCT utilizes the some photodetector of spectrogrph replacement time domain OCT, surveys the spectrum of interference signal at frequency domain.In frequency domain OCT system, after the interference light signal of reference arm and feeler arm collimation, incide on grating, after optical grating diffraction, by object lens, focused on photodiode array, obtain the interference spectrum of signal; By interference spectrum being done to the reflectivity information that inverse Fourier transform can obtain sample depth resolution.
Because frequency domain OCT technology is utilized a spectrogrph replacement point photodetector, with respect to time domain OCT technology, reduced one-dimensional scanning, there is higher image taking speed.The image taking speed of current ultrafast frequency domain OCT system will exceed two orders of magnitude than the image taking speed of the fastest time domain OCT system.Frequency domain OCT technology makes real-time three-dimensional imaging of tissue really become possibility, and this is that it is with respect to the most important advantage of time domain OCT.
First frequency domain OCT technology is applied in the diagnosis of ophthalmic diseases, the development with various functional OCT technology that improves constantly along with systematic function, the application of frequency domain OCT technology is also more extensive, has been widely used in the detection of ophthalmology, Gastroenterology, cardiovascular, dentistry and cutaneous diseases at present.And various clinical practices have also proposed more and more higher requirement to frequency domain OCT system, wherein just comprise miniaturization after system and instrumentation thereof and portable, especially in the ripe clinical practice field such as ophthalmology, wish OCT instrument can miniaturization to portable hand-held.
But in the spectrogrph of current frequency domain OCT system, first the interference signal of OCT is incident to diffraction grating after a collimating mirror collimation, and being focused to by focus lamp on the photodiode arrays such as CCD again after optical grating diffraction realized interference spectrum and surveyed.In the spectrogrph of this kind of structure, the collimation of incident beam and the focusing of diffracted beam are used respectively collimating mirror and focus lamp to realize, and incident beam collimation is focused to two discrete light paths with diffracted beam, and light path is longer, be unfavorable for miniaturization, be unfavorable for compactness and the portability of OCT instrument.
Summary of the invention
The purpose of this utility model is to provide a kind of spectrogrph for frequency domain OCT system, this spectrometer architecture is simple, compact, utilize an achromat to realize the focusing of collimation and the diffraction grating diffraction light of incident illumination simultaneously, be conducive to miniaturization and the portability of frequency domain OCT system.
Technical solution of the present utility model is as follows:
For a spectrogrph for frequency domain OCT system, its structure comprises single-mode fiber, achromat, balzed grating,, photodetector and spectrogrph base plate; The interference light of OCT system inputs to single-mode fiber, and the collimated beam of the output light of single-mode fiber after achromat collimation exposes on balzed grating,, and the focused beam of the first-order diffraction light of balzed grating, after achromat focuses on surveyed by photodetector; Described single-mode fiber, achromat, balzed grating, and photodetector are all fixed on spectrogrph base plate.
The output end face of described single-mode fiber output port is positioned at the front focus of achromat, and output port is PC or APC joint.
The flare angle of described balzed grating, is γ degree, and the groove direction of balzed grating, is parallel to the intersection of spectrogrph base plate place plane and balzed grating, place plane.
Described balzed grating, on base plate position determine as follows: first make the angle of spectrogrph base plate place plane and balzed grating, place plane equal (90-γ) and spend, on balzed grating,, the angle of incidence of incident illumination equates with the angle of diffraction; Then take in the plane of balzed grating, is rotating shaft rotation balzed grating, θ angle through the vertical straight line of groove direction balzed grating, center and balzed grating,, so that first-order diffraction light separates with the collimated beam exposing on balzed grating,, wherein θ is less than 5 degree.
On the focal plane of the first-order diffraction light that the photosurface of described photodetector is positioned at balzed grating, after achromat focuses on.
Described photodetector is line array CCD, linear array CMOS photodiode array part.
This utility model is compared with technology formerly, has the following advantages and good effect:
1, this utility model utilizes an achromat to realize the focusing of collimation and the diffraction grating first-order diffraction light of incident illumination simultaneously, compares with spectrometer architecture conventional in OCT system, has saved an achromat focusing on for light beam.
2, this utility model is simple in structure, can realize compact optical spectrometer, is conducive to the miniaturization of frequency domain OCT system.
Accompanying drawing explanation
Fig. 1 is that this utility model is for the structural representation of the spectrogrph of frequency domain OCT system.
Fig. 2 is that this utility model is for the OCT system schematic at the spectrogrph place of frequency domain OCT system.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but should not limit protection domain of the present utility model with this.
This utility model for the structural representation of the spectrogrph of frequency domain OCT system as shown in Figure 1.As seen from the figure, this utility model is for the spectrogrph of frequency domain OCT system, and its structure comprises single-mode fiber 1, achromat 2, balzed grating, 3, photodetector 4 and spectrogrph base plate 5; The interference light of OCT system inputs to single-mode fiber 1, the collimated beam 7 of the output light 6 of single-mode fiber 1 after achromat 2 collimations exposes on balzed grating, 3, and the focused beam 9 of the first-order diffraction light 8 of balzed grating, 3 after achromat 2 focuses on surveyed by photodetector 4; Single-mode fiber 1, achromat 2, balzed grating, 3 and photodetector 4 are all fixed on spectrogrph base plate 5.
The output end face of described single-mode fiber 1 output port is positioned at the front focus of achromat 2, and output port is PC or APC joint.
The flare angle of described balzed grating, 3 is γ degree, and the groove direction of balzed grating, 3 is parallel to the intersection of spectrogrph base plate 5 place planes and balzed grating, 3 place planes.
Described balzed grating, 3 on base plate 5 position determine as follows: first make the angle of spectrogrph base plate 5 place planes and balzed grating, 3 place planes equal (90-γ) and spend, on balzed grating, 3, the angle of incidence of incident illumination equates with the angle of diffraction; Then the straight line vertical with the groove direction of balzed grating, 3 through balzed grating, 3 centers in the plane of balzed grating, 3 of take is rotating shaft rotation balzed grating, 3 angle θ, so that first-order diffraction light 8 separates with the collimated beam 7 exposing on balzed grating,, wherein θ is less than 5 degree.
On the focal plane of the first-order diffraction light that the photosurface of described photodetector 4 is positioned at balzed grating, 3 after achromat 2 focuses on.
Described photodetector 4 is line array CCD, linear array CMOS photodiode array part.
Frequency domain OCT system as shown in Figure 2, the light that wideband light source 11 sends inputs to the port one 2a of fiber coupler 12, the two-way light of fiber coupler 12 outputs inputs to respectively reference arm and sample arm: the light of port one 2b output inputs to reference arm, after Polarization Controller 13, export collimating lens 14 to, after collimating lens 14 collimations, by reflecting mirror 15, reflected, and be back to lens 14 and Polarization Controller 13, again by the port one 2b that enters fiber coupler 12; The light of port one 2c output inputs to sample arm, after lens 16 collimations, by scanning galvanometer 17, reflex to condenser lens 18, light beam is incident to sample 19 after focusing on, the light beam being reflected by sample 19 passes through lens 18, scanning galvanometer 17 and lens 16 successively, again enters to the port one 2c of fiber coupler 12.By the interference signal of the port one 2d output of fiber coupler 12, input to the single-mode fiber 1 of the compact optical spectrometer for frequency domain OCT system of the present utility model, the signal of telecommunication of photodetector 4 outputs is gathered by computer 20, obtains after treatment the chromatography structural images of sample 19.
The centre wavelength of wideband light source 11 is 830nm, and bandwidth is ± 10nm; The light that wideband light source sends is injected respectively reference arm and sample arm through 50/50 fiber coupler.The light of reference arm end optical fiber output is radiated on reference mirror after collimation.The light of sample arm optical fiber output by galvanometer, is focused on sample by object lens after collimation.The front focal plane that the rotating shaft core of galvanometer is positioned at object lens forms approximate telecentric beam path, guarantees not introduce extra phase shift when scanning samples.The scattered light that reference mirror and sample return is coupled into optical fiber again, and by the outfan of fiber coupler, is connected to the single-mode fiber of the compact optical spectrometer for frequency domain OCT system of the present utility model.Single-mode fiber output port is APC joint; The focal length of achromat is 200mm, and bore is about Ф 50mm, and the output end face of single-mode fiber output port is positioned at the front focus of achromat, is 200mm with achromat centre distance; The line number of balzed grating, is 1200 lines/mm, and the length of side is 50mm, and the flare angle at 830nm wavelength place is 29.87 °; Determine the position of balzed grating, on base plate: first make the angle of spectrogrph base plate place plane and balzed grating, place plane equal (90-29.87)=60.13 degree, now on balzed grating,, the angle of incidence of incident illumination equates with the angle of diffraction, then take and through the vertical straight line of groove direction balzed grating, center and balzed grating,, as rotating shaft rotates balzed grating, angle 1, spend in the plane of balzed grating,, so that diffracted beam separates with incident beam; Photodetector is line array CCD, and pixel count is 1024, and Pixel Dimensions is 14 microns.Under these conditions, the spectral resolution of the compact optical spectrometer for frequency domain OCT system of the present utility model is 0.05nm, meets system requirements.
Claims (6)
1. for the spectrogrph of frequency domain OCT system, its structure comprises single-mode fiber (1), achromat (2), balzed grating, (3), photodetector (4) and spectrogrph base plate (5); The interference light of OCT system inputs to single-mode fiber (1), it is upper that the collimated beam (7) of the output light (6) of this single-mode fiber (1) after achromat (2) collimation is radiated at described balzed grating, (3), and the focused beam (9) of the first-order diffraction light (8) of this balzed grating, (3) after achromat (2) focuses on surveyed by photodetector (4); Described single-mode fiber (1), achromat (2), balzed grating, (3) and photodetector (4) are all fixed on spectrogrph base plate (5).
2. spectrogrph according to claim 1, it is characterized in that the output end face of described single-mode fiber (1) output port is positioned at the front focus of achromat (2), and output port is PC or APC joint.
3. spectrogrph according to claim 1, it is characterized in that the flare angle of described balzed grating, (3) is γ degree, and the groove direction of balzed grating, (3) is parallel to the intersection of spectrogrph base plate (5) place plane and balzed grating, (3) place plane.
4. spectrogrph according to claim 1, it is characterized in that described balzed grating, (3) is as follows at determining of the upper position of base plate (5): first make the angle of spectrogrph base plate (5) place plane and balzed grating, (3) place plane equal (90-γ) degree, the angle of incidence of the upper incident illumination of balzed grating, (3) equates with the angle of diffraction; Then take in the plane of balzed grating, (3) is (3) θ angles of rotating shaft rotation balzed grating, through the vertical straight line of the groove direction with balzed grating, (3) at balzed grating, (3) center, first-order diffraction light (8) and the collimated beam (7) exposing on balzed grating, are separated, and wherein θ is less than 5 degree.
5. spectrogrph according to claim 1, on the focal plane of the first-order diffraction light that the photosurface that it is characterized in that described photodetector (4) is positioned at balzed grating, (3) after achromat (2) focuses on.
6. spectrogrph according to claim 1, is characterized in that described photodetector (4) is for line array CCD, linear array CMOS photodiode array part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420058992.9U CN203828901U (en) | 2014-02-07 | 2014-02-07 | Spectrometer for frequency domain OCT system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420058992.9U CN203828901U (en) | 2014-02-07 | 2014-02-07 | Spectrometer for frequency domain OCT system |
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| CN203828901U true CN203828901U (en) | 2014-09-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103845039A (en) * | 2014-02-07 | 2014-06-11 | 中国科学院上海光学精密机械研究所 | Spectrograph for frequency domain OCT (Optical Coherence Tomography) system |
| CN114166347A (en) * | 2021-12-07 | 2022-03-11 | 苏州东方克洛托光电技术有限公司 | Medium-wave infrared hyperspectral spectral imaging unit |
| CN114235152A (en) * | 2021-12-07 | 2022-03-25 | 苏州东方克洛托光电技术有限公司 | Miniaturized imaging spectrometer light splitting optical path |
| CN114440772A (en) * | 2022-01-28 | 2022-05-06 | 合肥工业大学 | Blazed transmission grating spectrometer |
-
2014
- 2014-02-07 CN CN201420058992.9U patent/CN203828901U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103845039A (en) * | 2014-02-07 | 2014-06-11 | 中国科学院上海光学精密机械研究所 | Spectrograph for frequency domain OCT (Optical Coherence Tomography) system |
| CN103845039B (en) * | 2014-02-07 | 2015-09-16 | 中国科学院上海光学精密机械研究所 | For the spectrogrph of frequency domain OCT system |
| CN114166347A (en) * | 2021-12-07 | 2022-03-11 | 苏州东方克洛托光电技术有限公司 | Medium-wave infrared hyperspectral spectral imaging unit |
| CN114235152A (en) * | 2021-12-07 | 2022-03-25 | 苏州东方克洛托光电技术有限公司 | Miniaturized imaging spectrometer light splitting optical path |
| CN114440772A (en) * | 2022-01-28 | 2022-05-06 | 合肥工业大学 | Blazed transmission grating spectrometer |
| CN114440772B (en) * | 2022-01-28 | 2023-06-27 | 合肥工业大学 | Blazed transmission grating type spectrometer |
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