CN107064001A - Monochromatic light spectrometer polarization domain optical coherence tomography system based on photoswitch - Google Patents
Monochromatic light spectrometer polarization domain optical coherence tomography system based on photoswitch Download PDFInfo
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- CN107064001A CN107064001A CN201710111620.6A CN201710111620A CN107064001A CN 107064001 A CN107064001 A CN 107064001A CN 201710111620 A CN201710111620 A CN 201710111620A CN 107064001 A CN107064001 A CN 107064001A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
- G01N21/23—Bi-refringence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The present invention relates to polarization domain optical coherence tomography system regions, it is based especially on the monochromatic light spectrometer polarization domain optical coherence tomography system of photoswitch, by the photoswitch that 1 point of 2 tunnel of a high speed is placed in reference arm light path, the monochromatic light spectrometer timesharing detection of horizontal polarization and the path interferometric signal of vertical polarization two is realized using the channel selecting of photoswitch, the two-way polarization signal detected can obtain the intensity image with birefringence quality sample, fast axle image and delayed image by calculating.The present invention is simple in construction, it is not necessary to greatly reduce light path adjustment difficulty using Amici prism, it also avoid the intermode interference that polarization beam apparatus is brought, while being that polarization imaging can be achieved also without complicated phase modulation device and algorithm.
Description
Technical field
The present invention relates to polarization domain optical coherence tomography system regions, specifically related to a kind of list based on photoswitch
Spectrometer polarizes domain optical coherence tomography system.
Background technology
Polarization optics coherence chromatographic imaging (polarization-sensitive optical coherence
Tomography, OCT) it is a kind of new imaging method developed in traditional OCT image technical foundation, it is characterized in except energy
Enough provide can also obtain the polarization information of sample outside the same sample structure information of tradition OCT.Polarize OCT development companion all the time
The step developed with Conventional OCT techniques, is converted to scanning speed from the more slow time domain polarization OCT of sweep speed at present
Faster frequency domain polarization (OCT spectrum domain optical coherence tomography, SDOCT) is spent, including
Spectrum polarizing OCT and sweep polarization OCT.After polarised light incides testing sample, due to sample have birefringence so as to
The polarization properties of return light are changed, the polarization properties such as phase of testing sample can be obtained by detecting the polarization characteristic of return light
Position delay figure and quick shaft direction figure etc., while can provide and tradition OCT identical strength structure information.Obtain the inclined of sample
Information of shaking must measure the polarization interference information in samples vertical direction and the polarization interference information of horizontal direction.
It is that linearly polarized light by non-polarizing beamsplitter is divided into two beams in conventional polarization OCT systems, wherein a branch of by suitable
When the quarter wave plate that angle is placed becomes the linearly polarized light at incident polarization light direction angle at 45 °.Another light beam by a fast axle with
The quarter wave plate at its polarization direction angle at 45 ° incides sample with circularly polarized light, and returning to sample light and again passing by turns into ellipse after wave plate
When returning to beam splitter coherent superposition occurs for circularly polarized light, two-way polarised light, and then the coherent light is divided into by polarization beam apparatus
Mutually orthogonal two-beam is detected by two detectors respectively.Because broadband light is when by polarization beam apparatus light splitting, two-way is just
The polarised light of friendship, which can not be kept completely separate, causes two-way to polarize optical information generation cross talk effects image quality.Additionally, due to point
The use of light prism, will obtain more satisfactory imaging signal to noise ratio, and the difficulty of light path adjustment is larger.In spectral type polarization OCT,
Spectrometer ccd detector it is expensive, and have higher synchronous requirement during two-way detection to two spectrometers.Realize monochromatic light
Spectrometer polarizes OCT and then reference arm or end of probe is improved without using polarization beam apparatus.Fan et al. constructs two-way
Reference arm and introduce certain optical path difference combination gamut imaging algorithm between to separate two-way orthogonal signalling, this method is needed
Increase extra phase modulation device and more complicated algorithm, and the image pair of this method two-way reference optical signal formation
In the same depth of sample system sensitivity and differ and cause measurement error, and divided using unpolarized Amici prism
Light, adds light path adjustment difficulty.Bernhard et al. utilizes grating two beam crossed polarized lights with different diffraction in end of probe
The different regions of CCD are incided to realize Polarization Detection in angle, this method reduce diffraction efficiency, reduce system signal noise ratio, and
System fading margin is difficult.
Therefore, it is necessary to propose that the monochromatic light spectrometer polarization domain optical coherence based on photoswitch is chromatographed into for above mentioned problem
As system.
The content of the invention
For above-mentioned the deficiencies in the prior art, it is an object of the invention to provide the monochromatic light spectrometer based on photoswitch
Domain optical coherence tomography system is polarized, using single detector, cross-polarization is carried out using 1 point of 2 road photoswitch at a high speed
The channel selecting of light, without using Amici prism and polarization beam apparatus, simplifies system architecture and regulation difficulty, improves system steady
Qualitative and signal to noise ratio.
Monochromatic light spectrometer polarization domain optical coherence tomography system based on photoswitch, including Low coherence wideband light source,
Optical fiber polarizer, fiber coupling shunt, photoswitch, the first fiber reflector, optical fiber polarization controller, the second fiber reflection
Mirror, collimating mirror, quarter wave plate, 3-D scanning galvanometer, focusing objective len, testing sample, spectrometer and computer data acquiring equipment,
The Low coherence wideband light source connects fiber coupling shunt, the fiber coupling shunt distribution connection by optical fiber polarizer
Photoswitch, collimating mirror and spectrometer, the photoswitch connect the first fiber reflector and connected by optical fiber polarization controller respectively
The second fiber reflector is connect, the collimating mirror passes sequentially through quarter wave plate, 3-D scanning galvanometer and focusing objective len connection and treats test sample
Product, the spectrometer connects computer data acquiring equipment.
Preferably, the photoswitch uses 1 point of 2 road photoswitch or many points of Multichannel photoswitchs.
Preferably, the supporting Linear CCD Detector of Low coherence wideband light source or broadband frequency sweep low-coherence light source are supporting
Photodetector or photoelectricity balanced detector.
Preferably, the bandwidth range of the Low coherence wideband light source is tens nanometers to hundreds of nanometers.
Preferably, the Low coherence broadband uses light source LED, super-radiance light emitting diode, frequency sweep wideband light source
Or femto-second laser or super continuum source.
Preferably, the spectrometer is Michelson's interferometer or Mach-Zehnder interferometer.
Preferably, the optical fiber polarization controller can use wave plate, first fiber reflector and the second fiber reflection
Mirror is that collimating mirror adds plane mirror.
Monochromatic light spectrometer based on photoswitch polarizes domain optical coherence tomography system, and its workflow is：(1) low phase
The light that dry wideband light source is sent is coupled into Michelson's interferometer as linearly polarized light after the polarizer and is divided into reference light
Road and sample light；(2) reference light is divided into two-way by reference light by 1 point of 2 photoswitch, wherein inclined by an optical fiber all the way
Shake controller and fiber reflector return after the polarization direction of light 90 ° are turned over compared with incident light；(3) another road is anti-by optical fiber
Mirror reflection backtracking is penetrated, the equivalent optical path for causing two-way reference light and sample light is adjusted, fine difference can be easy to
Optical path compensation is carried out by software.Sample light causes the light for inciding sample to be circular polarization by an optical fiber polarization controller
Light, light polarization information of carrying sample after sample interior reflection again passes by optical fiber polarization controller and becomes elliptical polarization
Optical coupling is entered Michelson's interferometer and interfered with two-way reference light；(4) band respectively after two-way reference light and the sample interference of light
There is the polarization information of sample levels and vertical direction, optical channel selection controlled level and vertical direction are carried out by controlling light to open the light
The separate detection of polarization information is designated as I respectivelyHAnd IV, spectrometer gathers the interference spectrum signal of record by video frequency collection card
Afterwards feeding computer carry out data processing, by two paths of signals carry out transform to K spaces, interpolation, subtract after direct current carry out Fourier it is inverse
Conversion obtains the strength information and phase information per signal all the way, and A is designated as respectivelyH(z)、φH,AV(z)、φVBy calculating
Intensity map, phase delay figure and quick shaft direction figure to sample,
Due to using above-mentioned technical proposal, the present invention unused polarization beam apparatus, it is to avoid intermode interference is also not used point
Light prism reduces system fading margin difficulty, adds system signal noise ratio, using simple detector, reaches that simplified structure reduces cost
Purpose, it is not necessary to increase extra phase modulation device and complicated algorithm for reconstructing, calculating speed is improved, while having very strong
Practicality.
Brief description of the drawings
Fig. 1 is the system structure diagram of the present invention.
Embodiment
Embodiments of the invention are described in detail below in conjunction with accompanying drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
As shown in figure 1, the monochromatic light spectrometer polarization domain optical coherence tomography system based on photoswitch, including Low coherence
Wideband light source 1, optical fiber polarizer 2, fiber coupling shunt 3, photoswitch 4, the first fiber reflector 5, optical fiber polarization controller
6th, the second fiber reflector 7, collimating mirror 8, quarter wave plate 9,3-D scanning galvanometer 10, focusing objective len 11, testing sample 12, spectrum
Instrument 13 and computer data acquiring equipment 14, the Low coherence wideband light source 1 connect fiber coupling branch by optical fiber polarizer 2
Device 3, the fiber coupling shunt 3 connects photoswitch 4, collimating mirror 8 and spectrometer 13 respectively, and the photoswitch 4 is connected respectively
First fiber reflector 5 and the second fiber reflector 7 is connected by optical fiber polarization controller 6, the collimating mirror 8 passes sequentially through 1/
4 wave plates 9,3-D scanning galvanometer 10 and the connection testing sample 12 of focusing objective len 11, the connection of spectrometer 13 computer data are adopted
Collect equipment 14.
Further, the photoswitch 4 uses 1 point of 2 road photoswitch or many points of Multichannel photoswitchs, the Low coherence broadband
The supporting Linear CCD Detector of light source 1 or the supporting photodetector of broadband frequency sweep low-coherence light source or photoelectricity balanced detector.
Further, the bandwidth range of the Low coherence wideband light source 1 is tens nanometers to hundreds of nanometers, the Low coherence
Wideband light source 1 is using light source LED, super-radiance light emitting diode, frequency sweep wideband light source or femto-second laser or super continuous
Compose light source.
Further, the spectrometer 13 is Michelson's interferometer or Mach-Zehnder interferometer, the optical fiber polarisation
Controller 6 can use wave plate, and the fiber reflector 7 of the first fiber reflector 5 and second is that collimating mirror adds plane reflection
Mirror.
Monochromatic light spectrometer based on photoswitch polarizes domain optical coherence tomography system, and its workflow is：(1) low phase
The light that dry wideband light source is sent is coupled into Michelson's interferometer as linearly polarized light after the polarizer and is divided into reference light
Road and sample light；(2) reference light is divided into two-way by reference light by 1 point of 2 photoswitch, wherein inclined by an optical fiber all the way
Shake controller and fiber reflector return after the polarization direction of light 90 ° are turned over compared with incident light；(3) another road is anti-by optical fiber
Mirror reflection backtracking is penetrated, the equivalent optical path for causing two-way reference light and sample light is adjusted, fine difference can be easy to
Optical path compensation is carried out by software, sample light causes the light for inciding sample to be circular polarization by an optical fiber polarization controller
Light, light polarization information of carrying sample after sample interior reflection again passes by optical fiber polarization controller and becomes elliptical polarization
Optical coupling is entered Michelson's interferometer and interfered with two-way reference light；(4) band respectively after two-way reference light and the sample interference of light
There is the polarization information of sample levels and vertical direction, optical channel selection controlled level and vertical direction are carried out by controlling light to open the light
The separate detection of polarization information is designated as I respectivelyHAnd IV, spectrometer gathers the interference spectrum signal of record by video frequency collection card
Afterwards feeding computer carry out data processing, by two paths of signals carry out transform to K spaces, interpolation, subtract after direct current carry out Fourier it is inverse
Conversion obtains the strength information and phase information per signal all the way, and A is designated as respectivelyH(z)、φH,AV(z)、φVBy calculating
Intensity map, phase delay figure and quick shaft direction figure to sample,
Traditional double detector system needs strict synchronization when being detected to level and polarization two paths of signals, otherwise two
The time delay that detector detects signal can reduce picture quality, and use polarization beam apparatus (Amici prism) or non-inclined
The Amici prism that shakes carries out light splitting, introduces noise and increases in light path adjustment difficulty, the present embodiment, it is only necessary to use one
Detector and polarization beam apparatus and Amici prism need not be used, without additionally increase phase modulation device and complicated algorithm
Horizontal and vertical two paths of signals is may detect, contrast existing system structure is simplified, and system fading margin is simple and easy to apply.
The unused polarization beam apparatus of the present invention, it is to avoid intermode interference, is also not used Amici prism and reduces system fading margin
Difficulty, adds system signal noise ratio, using simple detector, reaches that simplified structure reduces the purpose of cost, it is not necessary to which increase is extra
Phase modulation device and complicated algorithm for reconstructing, improve calculating speed.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize
Equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, be included within the scope of the present invention.
Claims (8)
1. the monochromatic light spectrometer polarization domain optical coherence tomography system based on photoswitch, it is characterised in that：Including Low coherence
Wideband light source, optical fiber polarizer, fiber coupling shunt, photoswitch, the first fiber reflector, optical fiber polarization controller, second
Fiber reflector, collimating mirror, quarter wave plate, 3-D scanning galvanometer, focusing objective len, testing sample, spectrometer and computer data are adopted
Collect equipment, the Low coherence wideband light source connects fiber coupling shunt, the fiber coupling shunt by optical fiber polarizer
Photoswitch, collimating mirror and spectrometer are connected respectively, and the photoswitch connects the first fiber reflector and by optical fiber polarisation respectively
Controller connects the second fiber reflector, and the collimating mirror passes sequentially through quarter wave plate, 3-D scanning galvanometer and focusing objective len connection
Testing sample, the spectrometer connects computer data acquiring equipment.
2. the monochromatic light spectrometer polarization domain optical coherence tomography system according to claim 1 based on photoswitch, its
It is characterised by：The photoswitch uses 1 point of 2 road photoswitch or many points of Multichannel photoswitchs.
3. the monochromatic light spectrometer polarization domain optical coherence tomography system according to claim 1 based on photoswitch, its
It is characterised by：The supporting photoelectricity of the supporting Linear CCD Detector of Low coherence wideband light source or broadband frequency sweep low-coherence light source is visited
Survey device or photoelectricity balanced detector.
4. the monochromatic light spectrometer polarization domain optical coherence tomography system according to claim 1 based on photoswitch, its
It is characterised by：The bandwidth range of the Low coherence wideband light source is tens nanometers to hundreds of nanometers.
5. the monochromatic light spectrometer polarization domain optical coherence tomography system according to claim 1 based on photoswitch, its
It is characterised by：The Low coherence broadband uses light source LED, super-radiance light emitting diode, frequency sweep wideband light source or femtosecond
Laser or super continuum source.
6. the monochromatic light spectrometer polarization domain optical coherence tomography system according to claim 1 based on photoswitch, its
It is characterised by：The spectrometer is Michelson's interferometer either Mach-Zehnder interferometer.
7. the monochromatic light spectrometer polarization domain optical coherence tomography system according to claim 1 based on photoswitch, its
It is characterised by：The optical fiber polarization controller can use wave plate, and first fiber reflector and the second fiber reflector are
Collimating mirror adds plane mirror.
8. the monochromatic light spectrometer polarization domain optical coherence tomography system based on photoswitch, it is characterised in that：Its workflow
For：(1) light that broadband low-coherence light source is sent after the polarizer as linearly polarized light be coupled into Michelson's interferometer and
It is divided into reference path and sample light；
(2) reference light is divided into two-way by reference light by 1 point of 2 photoswitch, wherein all the way by an optical fiber polarisation control
The polarization direction of light turns over 90 ° compared with incident light after device and fiber reflector are returned；
(3) backtracking is reflected in another road by fiber reflector, is adjusted the light path for causing two-way reference light and sample light
Equal, fine difference can be easy to carry out optical path compensation by software, and sample light causes by an optical fiber polarization controller
The light for inciding sample is circularly polarized light, and light carries sample polarization information after being reflected by sample interior again passes by optical fiber
Polarization Controller becomes elliptically polarized light and is coupled into Michelson's interferometer to interfere with two-way reference light；
(4) polarization information of the two-way reference light with being respectively provided with sample levels and vertical direction after the sample interference of light, passes through control
Light, which opens the light, carries out optical channel selection controlled level and the separate detection of vertical direction polarization information is designated as I respectivelyHAnd IV, spectrometer
Computer is sent into after the interference spectrum signal of record is gathered by video frequency collection card and carries out data processing, two paths of signals is become
Change to K spaces, interpolation, subtract strength information and phase information that progress inverse Fourier transform after direct current obtains every signal all the way, point
A is not designated as itH(z)、φH,AV(z)、φV, the intensity map, phase delay figure and quick shaft direction figure of sample are obtained by calculating,
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| CN108535217A (en) * | 2018-04-08 | 2018-09-14 | 雄安华讯方舟科技有限公司 | optical coherence tomography system |
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