CN208937183U - A kind of OCT conjugation mirror image of eliminating determines difference two-way spectral coverage OCT device - Google Patents
A kind of OCT conjugation mirror image of eliminating determines difference two-way 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 two-way spectral coverage OCT device, including super-radiance light emitting diode, collimator, focusing objective len, the first beam splitter, the second beam splitter, third beam splitter, the 4th beam splitter, the first reflecting mirror, sample, the first spectrometer, the second spectrometer；The phase difference of the utility model interference signal is stablized, and doubles in imaging depth while not reducing system imaging speed.
Description
Technical field
OCT conjugation mirror image, which can be eliminated, the utility model relates to one kind determines difference two-way spectral coverage OCT device.
Background technique
Interference signal caused by spectral domain optical coherent tomographic system is the interference signal of complex field, has real part and void
Portion, however, the spectrometer of traditional spectral coverage OCT can only collect the real part information of sample interference signal.Due to lacking for interference signal
It loses, mixing can be generated when carrying out Fast Fourier Transform (FFT), so that there are two pictures when system imaging, i.e., true picture and conjugation
Mirror image.And in the method for traditional removal conjugation mirror image, phase-shifting method be largely controlled using data collecting card voltage output from
And piezoelectric ceramics is driven to carry out phase shift.The Stability and veracity of the phase obtained by the method is by piezoelectric ceramics performance shadow
Sound is very big, and needs to acquire signal at least twice in the same position, affects image taking speed, is unfavorable for real time imagery；3×3
Fiber coupler method is the interference signal that two phases are obtained using 3 × 3 fiber couplers, although can also obtain stationary phase
The interference signal of difference, but the manufacture of 3 × 3 fiber couplers is complex, and can not export that two interference strengths are equal to be determined
Differ interference signal.
Summary of the invention
In view of this, the purpose of this utility model is to provide the difference two-ways of determining that one kind can eliminate OCT conjugation mirror image to compose
Domain OCT device can disposably be generated 90 ° of phase difference of two interference signals and be interfered using two spectrometer synchronous acquisitions two
Signal removes conjugation image method removal conjugation mirror image then in conjunction with two-phase.
To achieve the above objectives, the present invention adopts the following technical solutions:
A kind of OCT conjugation mirror image of eliminating determines difference two-way spectral coverage OCT device, including super-radiance light emitting diode, standard
Straight device, focusing objective len, the first beam splitter, the second beam splitter, third beam splitter, the 4th beam splitter, the first reflecting mirror, sample, the
One spectrometer, the second spectrometer；The light that the super-radiance light emitting diode issues is collimated into a branch of directional light by collimator；It should
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 is sample
Light, another beam are reference light；Sample light emission is to sample, the first reflecting mirror of reference light directive；The back-scattering light of sample is by the
Four beam splitters are divided into the equal A mouth sample light and B mouthfuls of sample light of power, and the reflected light of the first reflecting mirror passes through the second beam splitting
Mirror 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 concerned with model in light source
Interference signal is generated in enclosing and when being overlapped at the first beam splitter；When the optical path difference of B mouthfuls of sample light and reference light is in light source
Interference signal is generated in coherent ranges and when being overlapped at third beam splitter；A mouthfuls of interference signals inject the first spectrometer, B
Mouth interference signal is injected into the second spectrometer.
Further, described device further includes the first acquisition mirror and the second acquisition mirror；The interference signal of the A mouthfuls of generation is logical
The first acquisition mirror is crossed to be introduced into spectrometer；The interference signal of the B mouthfuls of generation is introduced into spectrometer by the second acquisition mirror.
Further, first spectrometer includes the first cylindrical lens, the first slit, the second cylindrical lens, the first reflection
Mirror, third cylindrical lens, the first reflective groove diffraction grating and the first line-scan digital camera；Second spectrometer includes the 6th column
Lens, the second slit, the 5th cylindrical lens, third reflecting mirror, the 4th cylindrical lens, the second reflective groove diffraction grating and the second line
Array camera.
Further, described device further includes a host computer, the host computer and the first line-scan digital camera and the second linear array phase
Machine, and the interference signal that the two-phase potential difference for controlling two line-scan digital camera synchronous acquisition samples is 90 °.
Further, a kind of control method for determining difference two-way spectral coverage OCT device for eliminating OCT conjugation mirror image, it is special
Sign is, comprising the following steps:
Step S1: the light issued by super-radiance light emitting diode is collimated into a branch of directional light by 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 A mouthfuls of interference signals is injected into the first spectrometer, B mouthfuls of interference signals is injected into the second spectrometer；
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 is carried out to the interference signal for the out of phase that the first line-scan digital camera and the second line-scan digital camera are captured
Reconstruct, obtains the interference signal of complex field；
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；
Its formula of the interference signal expression for the line-scan digital camera capture that S62:A mouthfuls of step is as the formula:
(5)
Its formula of B mouthfuls of the interference signal of line-scan digital camera capture is as the formula (6):
(6)
The direct current of reference arm and sample arm is acquired, after button removes direct current signal, formula (5) and (6) be can be expressed as:
(7)
By formula (6), the intensity and phase of the interference signal at each wavelength are calculated:
(8)
(9)
Step S43: the interference signal after reconstruct indicates are as follows:
(10).
The utility model has the advantages that compared with prior art
The utility model can obtain two interference signals that phase difference is 90 °, the phase difference of interference signal without phase shifter
It not being influenced by phase shifter performance, anti-interference ability is stronger, meanwhile, using the interference of two spectrometer synchronous acquisitions, two phases
Information will not reduce the image taking speed of system.
Detailed description of the invention
Fig. 1 is the utility model structure principle chart；
Fig. 2 is A mouthfuls of interference spectrums and FFT result figure in an embodiment of the present invention；
Fig. 3 is B mouthfuls of interference spectrums and FFT result figure in an embodiment of the present invention；
Fig. 4 is the real part and imaginary part figure of interference signal after reconstructing in an embodiment of the present invention；
Fig. 5 is the interference signal FFT result figure after reconstructing in an embodiment of the present invention；
In figure: 1- super-radiance light emitting diode, 2- collimator, 3- focusing objective len, the first beam splitter of 4-, 5- first are acquired
Mirror, the first cylindrical lens of 6-, the first slit of 7-, the second cylindrical lens of 8-, the first reflecting mirror of 9-, 10- third cylindrical lens, 11- First Line
Array camera, the reflective groove diffraction grating of 12- first, the second beam splitter of 13-, the second reflecting mirror of 14-, 15- host computer, 16-
Two line-scan digital cameras, the 4th cylindrical lens of 17-, the reflective groove diffraction grating of 18- second, 19- third reflecting mirror, the 5th column of 20- are saturating
Mirror, the second slit of 21-, the 6th cylindrical lens of 22-, the second collection len of 23-, 24- third beam splitter, 25- sample, the 4th point of 26-
Shu Jing.
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 two-way spectral coverage OCT device,
Including super-radiance light emitting diode 1, collimator 2, focusing objective len 3, the first beam splitter 4, the second beam splitter 13, third beam splitter
24, the 4th beam splitter 26, the first reflecting mirror 9, sample 25, the first spectrometer, the second spectrometer；The super-radiance light emitting diode
1 light issued is collimated into a branch of directional light by collimator 2；The directional light is focused by focusing objective len 3, by the after focusing
One beam splitter 4 is divided into the equal two-beam of power, and a branch of is sample light, and another beam is reference light；Sample light emission is joined to sample 25
Light emission is examined to the first reflecting mirror 9；The back-scattering light of sample 25 is divided into the equal A mouth sample light of power by the 4th beam splitter 26
With B mouthfuls of sample light, the reflected light of the first reflecting mirror 9 is divided into the equal A mouth reference light and B of power by the second beam splitter 13
Mouth reference light；It is overlapped 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 4
When generate interference signal；When within the optical path difference of B mouthfuls of sample light and reference light is in light source coherent ranges and in third beam splitter
Interference signal is generated when being overlapped at 24；A mouthfuls of interference signals inject the first spectrometer, and B mouthfuls of interference signals are injected into the second spectrometer.
In an embodiment of the utility model, described device further includes the first acquisition mirror 5 and the second acquisition mirror 23；The A
The interference signal that mouth generates is introduced into spectrometer by the first 5 mirrors of acquisition；The interference signal of the B mouthfuls of generation passes through the second acquisition
Mirror 23 is introduced into spectrometer.
In an embodiment of the utility model, first spectrometer includes the first cylindrical lens 6, the first slit 7, the second column
Lens 8, the first reflecting mirror 9, third cylindrical lens 10, the first reflective groove diffraction grating 12 and the first line-scan digital camera 11；It is described
Second spectrometer include the 6th cylindrical lens 22, the second slit 21, the 5th cylindrical lens 20, third reflecting mirror 19, the 4th cylindrical lens 17,
Second reflective groove diffraction grating 18 and the second line-scan digital camera 16.
In an embodiment of the utility model, described device further includes a host computer 15, the host computer 15 and First Line
Array camera 11 and the second line-scan digital camera 16, and the interference that the two-phase potential difference for controlling two line-scan digital camera synchronous acquisition samples is 90 ° is believed
Number.
In an embodiment of the utility model, it is a kind of eliminate OCT conjugation mirror image determine difference two-way spectral coverage OCT device
Control method, which comprises the following steps:
Step S1: the light issued by super-radiance light emitting diode 1 is collimated into a branch of directional light by collimator 2；
Step S2: the directional light is focused by focusing objective len 3, is divided into power phase by the first beam splitter 4 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 26
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
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 4
Interference signal；When the weight 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 24
Interference signal is generated when conjunction；
Step S4: adjusting third beam splitter 24 and the 4th beam splitter 26 makes the phase of A mouthfuls of interference signals and B mouthfuls of interference signals
Potential difference is 90 °, and A mouthfuls of interference signals is injected the first spectrometer, and B mouthfuls of interference signals are injected into the second spectrometer；
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 is carried out to the interference signal for the out of phase that the first line-scan digital camera and the second line-scan digital camera are captured
Reconstruct, obtains the interference signal of complex field；
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；
Its formula of the interference signal expression for the line-scan digital camera capture that S62:A mouthfuls of step is as the formula:
(5)
Its formula of B mouthfuls of the interference signal of line-scan digital camera capture is as the formula (6):
(6)
The direct current of reference arm and sample arm is acquired, after button removes direct current signal, formula (5) and (6) be can be expressed as:
(7)
By formula (6), the intensity and phase of the interference signal at each wavelength are calculated:
(8)
(9)
Step S43: the interference signal after reconstruct indicates are as follows:
(10).
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 two-way spectral coverage OCT device, it is characterised in that: including superradiation light-emitting
Diode, collimator, focusing objective len, the first beam splitter, the second beam splitter, third beam splitter, the 4th beam splitter, the first reflection
Mirror, sample, the first spectrometer, the second spectrometer；The light that the super-radiance light emitting diode issues is collimated into one by collimator
Beam 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,
A branch of is sample light, and another beam is reference light；Sample light emission is to sample, the first reflecting mirror of reference light directive；Sample dissipates backwards
It penetrates light and is divided into the equal A mouth sample light and B mouthfuls of sample light of power, the reflected light warp of the first reflecting mirror by the 4th beam splitter
It crosses the second beam splitter and 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 exists
Interference signal is generated in light source coherent ranges and when being overlapped at the first beam splitter；When the light of B mouthfuls of sample light and reference light
Path difference in light source coherent ranges within and at third beam splitter be overlapped when generate interference signal；A mouthfuls of interference signals inject the
One spectrometer, B mouthfuls of interference signals are injected into the second spectrometer.
2. one kind according to claim 1, which can eliminate OCT conjugation mirror image, determines difference two-way spectral coverage OCT device, feature
Be: described device further includes the first acquisition mirror and the second acquisition mirror；The interference signal of the A mouthfuls of generation passes through the first acquisition mirror
It is introduced into spectrometer；The interference signal of the B mouthfuls of generation is introduced into spectrometer by the second acquisition mirror.
3. one kind according to claim 1, which can eliminate OCT conjugation mirror image, determines difference two-way spectral coverage OCT device, feature
Be: first spectrometer include the first cylindrical lens, the first slit, the second cylindrical lens, the first reflecting mirror, third cylindrical lens,
First reflective groove diffraction grating and the first line-scan digital camera；Second spectrometer includes the 6th cylindrical lens, the second slit, the
Five cylindrical lens, third reflecting mirror, the 4th cylindrical lens, the second reflective groove diffraction grating and the second line-scan digital camera.
4. one kind according to claim 3, which can eliminate OCT conjugation mirror image, determines difference two-way spectral coverage OCT device, feature
Be: described device further includes a host computer, the host computer and the first line-scan digital camera and the second line-scan digital camera, and controls two lines
The interference signal that the two-phase potential difference of array camera synchronous acquisition sample is 90 °.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109297597A (en) * | 2018-11-09 | 2019-02-01 | 福州大学 | A kind of OCT conjugation mirror image of eliminating determines difference two-way spectral coverage OCT device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109297597A (en) * | 2018-11-09 | 2019-02-01 | 福州大学 | A kind of OCT conjugation mirror image of eliminating determines difference two-way spectral coverage OCT device and method |
| CN109297597B (en) * | 2018-11-09 | 2023-09-29 | 福州大学 | Phased-difference double-path spectral domain OCT device and method capable of eliminating OCT conjugate mirror image |
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