CN208937182U - A kind of OCT conjugation mirror image of eliminating determines difference spectral coverage OCT device - Google Patents
A kind of OCT conjugation mirror image of eliminating determines difference spectral coverage OCT device Download PDFInfo
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Abstract
OCT conjugation mirror image, which can be eliminated, the utility model relates to one kind determines difference spectral coverage OCT device, including super-radiance light emitting diode, first collimator, focusing objective len, the first beam splitter, the second beam splitter, third beam splitter, the 4th beam splitter, the first reflecting mirror, sample, photoswitch, spectrometer；The utility model structure is simple, it can effectively solve the problem that tradition phase-shifting method phase shifting accuracy inaccuracy and stability of phase shift problem, simultaneously, make two interference signal consistency higher using the method that the method for the switching cooperation monochromatic light spectrometer acquisition of photoswitch replaces bispectrometer acquisition in signal acquisition, system design cost is lower, and commercial value is higher.
Description
Technical field
OCT conjugation mirror image, which can be eliminated, the utility model relates to one kind determines difference spectral coverage OCT device.
Background technique
Traditional spectral coverage OCT can only collect the solid part signal of sample and lead to it since collector is when being acquired
Can exist in imaging relative to zero light path, two pictures, i.e., true picture and conjugation mirror image.And traditional removal conjugation mirror image
In method, phase-shifting method is largely using data collecting card control voltage output to drive piezoelectric ceramics to carry out phase shift.It is logical
The Stability and veracity for crossing the phase of the method acquisition is influenced very greatly by piezoelectric ceramics performance, and needs to adopt in the same position
Collect signal at least twice, affects image taking speed, be unfavorable for real time imagery；3 × 3 fiber coupler methods are using 3 × 3 optical fiber couplings
Clutch obtains the interference signal of two phases, although can also obtain the interference signal of fixed skew, 3 × 3 optical fiber couplings
The manufacture of clutch is complex, and can not export two interference strengths it is equal determine difference interference signal.
Summary of the invention
In view of this, can eliminate OCT conjugation mirror image the purpose of this utility model is to provide one kind determines difference spectral coverage OCT
Device, structure is simple, can effectively solve the problem that tradition phase-shifting method phase shifting accuracy inaccuracy and stability of phase shift problem.
To achieve the above objectives, the present invention adopts the following technical solutions:
A kind of OCT conjugation mirror image of eliminating determines difference spectral coverage OCT device, it is characterised in that: including superradiation light-emitting two
Pole pipe, first collimator, focusing objective len, the first beam splitter, it is the second beam splitter, third beam splitter, the 4th beam splitter, first anti-
Penetrate mirror, sample, photoswitch, spectrometer；The light that the super-radiance light emitting diode issues is collimated into a branch of by first collimator
Directional light；The directional light is focused by focusing objective len, is divided into the equal two-beam of power by the first beam splitter after focusing, and one
Beam is sample light, and another beam is reference light；Sample light emission is to sample, the first reflecting mirror of reference light directive；The backscattering of sample
Light is divided into the equal A mouth sample light and B mouthfuls of sample light of power by the 4th beam splitter, and the reflected light of the first reflecting mirror passes through
Second beam splitter is divided into the equal A mouth reference light and B mouthfuls of reference lights of power；When the optical path difference of A mouthfuls of sample light and reference light is in light
Interference signal is generated in the coherent ranges of source and when being overlapped at the first beam splitter；When the light path of B mouthfuls of sample light and reference light
Difference in light source coherent ranges within and at third beam splitter be overlapped when generate interference signal；The A mouthfuls of interference generated with B mouthfuls are believed
It number is introduced into spectrometer by photoswitch.
Further, described device further includes the first acquisition mirror, the second acquisition mirror, third acquisition mirror and the 4th acquisition mirror；
The interference signal of the A mouthfuls of generation is introduced into spectrometer by the first acquisition mirror and the second acquisition mirror through photoswitch；The B mouthfuls of production
Raw interference signal acquires mirror and the 4th acquisition mirror by third and is introduced into spectrometer through photoswitch.
Further, described device further includes a host computer, and the host computer is connect with photoswitch；The host computer passes through
Output voltage controls photoswitch, so that A mouthfuls of interference signals of control selections or B mouthfuls of interference signals enter spectrometer.
Further, the spectrometer includes the second collimator, the first cylindrical lens, slit, the second cylindrical lens, the second reflection
Mirror, reflective groove diffraction grating, third cylindrical lens and line-scan digital camera；The interference signal that the photoswitch introduces passes sequentially through the
Two collimators, the first cylindrical lens, slit, the second cylindrical lens, the reflective groove diffraction grating of the second reflecting mirror directive, then pass through
Third cylindrical lens directive images line-scan digital camera.
A kind of control method for determining difference spectral coverage OCT device for eliminating OCT conjugation mirror image, comprising the following steps:
Step S1: the light issued by super-radiance light emitting diode is collimated into a branch of directional light by first collimator；
Step S2: the directional light is focused by focusing objective len, and it is equal by the first beam splitter to be divided into power after focusing
Two-beam, it is a branch of be sample light, another beam be reference light；Sample light emission is to sample, the first reflecting mirror of reference light directive；
Step S3: the back-scattering light of sample is divided into the equal A mouth sample light and B mouthfuls of samples of power by the 4th beam splitter
Light, the reflected light of the first reflecting mirror are divided into the equal A mouth reference light and B mouthfuls of reference lights of power by the second beam splitter；Work as A
The optical path difference of mouthful sample light and reference light in light source coherent ranges within and while being overlapped at the first beam splitter generate interference letter
Number；It is generated when within the optical path difference of B mouthfuls of sample light and reference light is in light source coherent ranges and when being overlapped at third beam splitter
Interference signal；
Step S4: adjusting third beam splitter and the 4th beam splitter makes the phase difference of A mouthfuls of interference signals and B mouthfuls of interference signals
It is 90 °, and enters spectrometer by photoswitch A mouthfuls of interference signals of control or B mouthfuls of interference signals；
Step S5: interference signal enters in spectrometer, is unfolded through reflective groove diffraction grating by wavelength and by linear array phase
Machine is captured；The interference signal that line-scan digital camera is captured is as the formula (1):
Wherein, DC is direct current signal, and AC is each layer of sample arm from coherent signal,It is the light distribution letter of light source
Number,WithIt is the light path of sample arm,It is the light path of reference arm,For wave number；
Step S6: signal reconstruction is carried out to the interference signal for the out of phase that line-scan digital camera is captured, obtains complex field
Interference signal；
Step S7: Fourier transformation is carried out to the interference signal of complex field, removal conjugation mirror image obtains the depth letter of sample
Breath.
Further, the step S6 specifically:
Step S61: formula (1) is reduced to formula (4)
(4)
Wherein,For the conjunction phase of each reflecting layer interference signal,For A mouthfuls and the phase difference of B mouthfuls of interference signals；
Step S62: step S62: two interference that phase difference is 90 ° being obtained by the switching of PC control photoswitch and are believed
NumberWith, formula is expressed as the formula:
(5)
The direct current of reference arm and sample arm is acquired, after button removes direct current signal, formula (5) be can be expressed as:
(6)
By formula (6), the intensity and phase of the interference signal at each wavelength are calculated:
(7)
(8)
Step S43: the interference signal after reconstruct indicates are as follows:
(9).
The utility model has the advantages that compared with prior art
1, the utility model can obtain two interference signals that phase difference is 90 °, the phase of interference signal without phase shifter
Difference is not influenced by phase shifter performance and anti-interference ability is stronger.
2, the utility model structure is simple, and system research and development cost is more cheap.
Detailed description of the invention
Fig. 1 is the utility model structure principle chart
Fig. 2 a is the mobile relationship with phase difference of an embodiment of the present invention beam splitter group beam splitter 3,4;
Fig. 2 b is the movement of an embodiment of the present invention beam splitter 3,4 and central wavelength phase difference relationship；
Fig. 3 is system performance parameter in an embodiment of the present invention；
Fig. 4 is traditional spectral coverage OCT imaging in an embodiment of the present invention；
Fig. 5 is to differ spectral coverage OCT imaging in an embodiment of the present invention surely；
In figure: 1- super-radiance light emitting diode, 2- first collimator, 3- focusing objective len, 4- first acquire mirror, and 5- second is adopted
Collection mirror, 6-A mouthfuls, the first beam splitter of 7-, the second beam splitter of 8-, the first reflecting mirror of 9-, 10- photoswitch, the second collimator of 11-, 12-
First cylindrical lens, 13- slit, the second cylindrical lens of 14-, the second reflecting mirror of 15-, the reflective groove diffraction grating of 16-, 17- third
Cylindrical lens, 18- line-scan digital camera, 19- host computer, 20-B mouthfuls, 21- third acquires mirror, and 22- the 4th acquires mirror, 23- third beam splitting
Mirror, the 4th beam splitter of 24-, 25- sample.
Specific embodiment
The utility model is described further with reference to the accompanying drawings and embodiments.
Please refer to Fig. 1, the utility model provide it is a kind of can eliminate OCT conjugation mirror image determine difference spectral coverage OCT device, it is special
Sign is: including super-radiance light emitting diode 1, first collimator 2, focusing objective len 3, the first beam splitter 7, the second beam splitter 8,
Three beam splitters 23, the 4th beam splitter 24, the first reflecting mirror 9, sample 25, photoswitch 10, spectrometer；Two pole of superradiation light-emitting
The light that pipe 1 issues is collimated into a branch of directional light by first collimator 2；The directional light is focused by focusing objective len 3, after focusing
It is divided into the equal two-beam of power by the first beam splitter 7, a branch of is sample light, and another beam is reference light；Sample light emission is to sample
Product 25, the first reflecting mirror of reference light directive 9；The back-scattering light of sample is divided into the equal A mouth of power by the 4th beam splitter 24
Sample light and B mouthfuls of sample light, the reflected light of the first reflecting mirror 9 are divided into the equal A mouth reference of power by the second beam splitter 8
Light and B mouthfuls of reference lights；When within the optical path difference of A mouthfuls of sample light and reference light is in light source coherent ranges and at the first beam splitter
Interference signal is generated when coincidence；When within the optical path difference of B mouthfuls of sample light and reference light is in light source coherent ranges and in third point
Beam Jing Chu generates interference signal when being overlapped；The A mouthfuls of interference signals generated with B mouthfuls are introduced into spectrometer by photoswitch 10.
In an embodiment of the utility model, described device further includes the first acquisition mirror 4, second acquisition mirror 5, third acquisition
Mirror 21 and the 4th acquisition mirror 22；The interference signal that the A mouth 6 generates is by the first acquisition mirror 4 and the second acquisition mirror 5 through photoswitch
It is introduced into spectrometer；The interference signal that the B mouth 20 generates acquires mirror 21 and the 4th acquisition mirror 22 through photoswitch 10 by third
It is introduced into spectrometer.
In an embodiment of the utility model, described device further includes a host computer 19, the host computer 19 and photoswitch
10 connections；The host computer 19 controls photoswitch 10 by output voltage, thus A mouthfuls of interference signals of control selections or B dry
It relates to signal and enters spectrometer.
In an embodiment of the utility model, the spectrometer include the second collimator 11, the first cylindrical lens 12, slit,
13, the second cylindrical lens 14, the second reflecting mirror 15, reflective groove diffraction grating 16, third cylindrical lens 17 and line-scan digital camera 18；Institute
The interference signal for stating the introducing of photoswitch 10 passes sequentially through the second collimator 11, the first cylindrical lens 12, slit 13, the second cylindrical lens
14, then the second reflection mirror 15 images line-scan digital camera by 17 directive of third cylindrical lens to reflective groove diffraction grating 16
18。
A kind of control method for determining difference spectral coverage OCT device for eliminating OCT conjugation mirror image, comprising the following steps:
Step S1: the light issued by super-radiance light emitting diode 1 is collimated into a branch of directional light by first collimator 2；
Step S2: the directional light is focused by focusing objective len 3, is divided into power phase by the first beam splitter 7 after focusing
Deng two-beam, it is a branch of be sample light, another beam be reference light；Sample light emission is to sample 25, the first reflecting mirror of reference light directive
9；
Step S3: the back-scattering light of sample 25 is divided into the equal A mouth sample light of power and B mouthfuls by the 4th beam splitter 24
Sample light, the reflected light of the first reflecting mirror 9 are divided into the equal A mouth reference light of power and B mouthfuls of references by the second beam splitter 8
Light；It is generated when within the optical path difference of A mouthfuls of sample light and reference light is in light source coherent ranges and when being overlapped at the first beam splitter
Interference signal；It is overlapped when within the optical path difference of B mouthfuls of sample light and reference light is in light source coherent ranges and at third beam splitter
When generate interference signal；
Step S4: adjusting third beam splitter 23 and the 4th beam splitter 24 makes the phase of A mouthfuls of interference signals and B mouthfuls of interference signals
Potential difference is 90 °, and enters spectrometer by photoswitch A mouthfuls of interference signals of control or B mouthfuls of interference signals；
Rapid S5 step by step: interference signal enters in spectrometer, is unfolded through reflective groove diffraction grating by wavelength and by linear array
Camera is captured；The interference signal that line-scan digital camera is captured is as the formula (1):
Wherein, DC is direct current signal, and AC is each layer of sample arm from coherent signal,It is the light distribution letter of light source
Number,WithIt is the light path of sample arm,It is the light path of reference arm,For wave number；
Step S6: signal reconstruction is carried out to the interference signal for the out of phase that line-scan digital camera is captured, obtains complex field
Interference signal；
Step S7: Fourier transformation is carried out to the interference signal of complex field, removal conjugation mirror image obtains the depth letter of sample
Breath.
In an embodiment of the utility model, the step S6 specifically:
Step S61: formula (1) is reduced to formula (4)
(4)
Wherein,For the conjunction phase of each reflecting layer interference signal,For A mouthfuls and the phase difference of B mouthfuls of interference signals；
Step S62: step S62: two interference that phase difference is 90 ° being obtained by the switching of PC control photoswitch and are believed
NumberWith, formula is expressed as the formula:
(5)
The direct current of reference arm and sample arm is acquired, after button removes direct current signal, formula (5) be can be expressed as:
(6)
By formula (6), the intensity and phase of the interference signal at each wavelength are calculated:
(7)
(8)
Step S43: the interference signal after reconstruct indicates are as follows:
(9).
The above is only the preferred embodiment of the present invention, it is all done according to present utility model application the scope of the patents it is equal
Deng variation and modification, it should all belong to the covering scope of the utility model.
Claims (4)
1. one kind, which can eliminate OCT conjugation mirror image, determines difference spectral coverage OCT device, it is characterised in that: including two pole of superradiation light-emitting
Pipe, first collimator, focusing objective len, the first beam splitter, the second beam splitter, third beam splitter, the 4th beam splitter, the first reflection
Mirror, sample, photoswitch, spectrometer；The light that the super-radiance light emitting diode issues is collimated into a branch of flat by first collimator
Row light；The directional light is focused by focusing objective len, is divided into the equal two-beam of power by the first beam splitter after focusing, a branch of
For sample light, another beam is reference light；Sample light emission is to sample, the first reflecting mirror of reference light directive；The back-scattering light of sample
It is divided into the equal A mouth sample light and B mouthfuls of sample light of power by the 4th beam splitter, the reflected light of the first reflecting mirror is by the
Two beam splitters are divided into the equal A mouth reference light and B mouthfuls of reference lights of power；When the optical path difference of A mouthfuls of sample light and reference light is in light source
Interference signal is generated in coherent ranges and when being overlapped at the first beam splitter；When the optical path difference of B mouthfuls of sample light and reference light
Interference signal is generated in light source coherent ranges and when being overlapped at third beam splitter；The A mouthfuls of interference signals generated with B mouthfuls
It is introduced into spectrometer by photoswitch.
2. one kind according to claim 1, which can eliminate OCT conjugation mirror image, determines difference spectral coverage OCT device, it is characterised in that:
Described device further includes the first acquisition mirror, the second acquisition mirror, third acquisition mirror and the 4th acquisition mirror；The interference of the A mouthfuls of generation
Signal is introduced into spectrometer by the first acquisition mirror and the second acquisition mirror through photoswitch；The interference signal of the B mouthfuls of generation passes through
Third acquisition mirror and the 4th acquisition mirror are introduced into spectrometer through photoswitch.
3. one kind according to claim 1, which can eliminate OCT conjugation mirror image, determines difference spectral coverage OCT device, it is characterised in that:
Described device further includes a host computer, and the host computer is connect with photoswitch；The host computer controls light by output voltage
Switch, so that A mouthfuls of interference signals of control selections or B mouthfuls of interference signals enter spectrometer.
4. one kind according to claim 1, which can eliminate OCT conjugation mirror image, determines difference spectral coverage OCT device, it is characterised in that:
The spectrometer includes the second collimator, the first cylindrical lens, slit, the second cylindrical lens, the second reflecting mirror, reflective groove diffraction
Grating, third cylindrical lens and line-scan digital camera；It is saturating that the interference signal that the photoswitch introduces passes sequentially through the second collimator, the first column
Mirror, slit, the second cylindrical lens, the reflective groove diffraction grating of the second reflecting mirror directive, are then gone by third cylindrical lens directive
Except the line-scan digital camera of conjugation mirror image.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109297598A (en) * | 2018-11-09 | 2019-02-01 | 福州大学 | A kind of OCT conjugation mirror image of eliminating determines difference spectral coverage OCT device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109297598A (en) * | 2018-11-09 | 2019-02-01 | 福州大学 | A kind of OCT conjugation mirror image of eliminating determines difference spectral coverage OCT device and method |
| CN109297598B (en) * | 2018-11-09 | 2023-08-11 | 福州大学 | Phasing difference spectrum domain OCT device and method capable of eliminating OCT conjugate mirror image |
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