CN208937181U - A kind of OCT conjugation mirror image of eliminating determines difference two-way linear array spectral coverage OCT device - Google Patents
A kind of OCT conjugation mirror image of eliminating determines difference two-way linear array spectral coverage OCT device Download PDFInfo
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- CN208937181U CN208937181U CN201821838722.4U CN201821838722U CN208937181U CN 208937181 U CN208937181 U CN 208937181U CN 201821838722 U CN201821838722 U CN 201821838722U CN 208937181 U CN208937181 U CN 208937181U
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Abstract
OCT conjugation mirror image, which can be eliminated, the utility model relates to one kind determines difference two-way linear array spectral coverage OCT device, including super-radiance light emitting diode, collimator, the first beam splitter, the second beam splitter, third beam splitter, the 4th beam splitter, the first cylindrical lens, the second cylindrical lens, third cylindrical lens, the first focusing objective len, the second focusing objective len, reflecting mirror, the first two-dimensional spectrometer, the second two-dimensional spectrometer and host computer.The utility model can disposably generate 90 ° of phase difference of two two-dimentional interference signals and using the two-dimentional interference signal of two two-dimensional spectrometer synchronous acquisitions two, remove conjugation image method removal conjugation mirror image then in conjunction with two-phase.
Description
Technical field
The utility model relates to imaging field, especially a kind of difference two-way linear array of determining that can eliminate OCT conjugation mirror image is composed
Domain OCT device.
Background technique
Linear array spectral coverage OCT can realize quick three-dimensional imaging in the imaging for disposably obtaining the entire axial interface of sample.
But there is some disadvantages for traditional linear array spectral-domain OCT system.Interference signal caused by traditional linear array spectral coverage OCT is plural number
The interference signal in domain has real part and imaginary part, does however, the two-dimensional spectrometer of traditional linear array spectral coverage OCT can only collect sample
Relate to the real part information of signal.Due to the missing of interference signal, mixing can be generated when carrying out Fast Fourier Transform (FFT), so that system
There are two pictures when imaging, i.e., true picture and conjugation mirror image.It is influenced to make imaging results not by conjugation mirror image, generally by sample
Product are placed in the side of zero light path position, this just makes the imaging depth of traditional linear array spectral coverage OCT there was only 2-7mm.
Summary of the invention
In view of this, can eliminate OCT conjugation mirror image the purpose of the utility model is to provide one kind determines difference two-way linear array
Spectral coverage OCT device can disposably be generated 90 ° of phase difference of two two-dimentional interference signals and be synchronized using two two-dimensional spectrometers
The two-dimentional interference signal of acquisition two.
The utility model is realized using following scheme: one kind can eliminate OCT conjugation mirror image and determine difference two-way linear array spectral domain
OCT device, including super-radiance light emitting diode, collimator, the first beam splitter, the second beam splitter, third beam splitter, the 4th beam splitting
Mirror, the first cylindrical lens, the second cylindrical lens, third cylindrical lens, the first focusing objective len, the second focusing objective len, reflecting mirror, the first two dimension
Spectrometer, the second two-dimensional spectrometer and host computer；
The four direction of first beam splitter is respectively arranged with the first cylindrical lens, the second cylindrical lens, the second beam splitter,
Three beam splitters；Second beam splitter is provided with the first focusing objective len on a light direction, another light direction and
One light direction of four beam splitters is opposite；The second conglomeration is disposed on one light direction of the third beam splitter
Mirror and reflecting mirror, another light direction are opposite with another light direction of the 4th beam splitter；4th beam splitter is not
Third cylindrical lens are provided on a light direction opposite with the second beam splitter, third beam splitter；
The light that the super-radiance light emitting diode issues is collimated into a branch of directional light through the collimator；The directional light according to
Secondary to be divided into the equal two-beam of power by the first horizontal positioned cylindrical lens, the first beam splitter, a branch of is sample light, Yi Shuwei
Reference light；The sample light is successively irradiated by the second beam splitter and the first focusing objective len to sample after the outgoing of the first beam splitter
Product；The reference light is successively irradiated through third beam splitter, the second focusing objective len to reflecting mirror after the outgoing of the first beam splitter；Sample
The back-scattering light of product is emitted back towards the second beam splitter and is divided into the equal A mouth sample light and B mouthfuls of sample light of power, when A mouthfuls of sample light and
Interference is generated when the optical path difference of reference light is overlapped within light source coherent ranges and at the first beam splitter, the interfering beam is by water
Second cylindrical lens of placing flat are irradiated after collimating again to the first two-dimensional spectrometer；When the optical path difference of B mouthfuls of sample light and reference light
Interference, the third column which is positioned horizontally are generated when being overlapped within light source coherent ranges and at the 4th beam splitter
Lens are irradiated after collimating again to the second two-dimensional spectrometer；
First spectrometer is electrical connected with the host computer with the second spectrometer, passes through two spectrometers of PC control
The interference signal that the two-phase potential difference of synchronous acquisition sample is 90 °.
Further, each spectrometer includes three cylindrical lens, a slit, a reflecting mirror, a reflective quarter
Line diffraction grating and an area array cameras；Interference signal is disposed with cylindrical lens, slit, column in the optical path in spectrometer
Lens, reflecting mirror, reflective groove diffraction grating, cylindrical lens, area array cameras.
Further, first beam splitter, the second beam splitter, third beam splitter and the composition interference of the 4th beam splitter
The characteristics of instrument, which combines Michelson interferometer and Mach-Zehnder interferometer.
Compared with prior art, the utility model has the following beneficial effects: the utility model determines difference two-way linear array
Spectral coverage OCT can obtain two interference signals that phase difference is 90 ° without phase shifter, and the phase difference of interference signal is not by phase shifter
The influence of energy, anti-interference ability are stronger.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment.
Fig. 2 is the A mouth interference spectrum and two-dimensional imaging result figure of the utility model embodiment.
Fig. 3 is the B mouth interference spectrum and two-dimensional imaging result figure of the utility model embodiment.
Fig. 4 be the utility model embodiment reconstruct after interference signal real part and imaginary part figure.
Fig. 5 is the two-dimensional imaging result figure after the reconstruct of the utility model embodiment.
In figure, 1 is super-radiance light emitting diode, 2 is collimator, 3 is the first beam splitter, 4 is the second beam splitter, 5 is
Three beam splitters, 6 be the 4th beam splitter, 7 be the first cylindrical lens, 8 be the second cylindrical lens, 9 be third cylindrical lens, 10 be the first focusing
Object lens, 11 for the second focusing objective len, 12 be reflecting mirror, 13 be the first two-dimensional spectrometer, 14 be the second two-dimensional spectrometer, 15 be on
Position machine；16,17,18 be the cylindrical lens in the first two-dimensional spectrometer, and 19 be the slit in the first two-dimensional spectrometer, and 20 be first
Reflecting mirror in two-dimensional spectrometer, 21 be the reflective groove diffraction grating in the first two-dimensional spectrometer, and 22 be the first two-dimentional light
Area array cameras in spectrometer；23,24,25 be the cylindrical lens in the second two-dimensional spectrometer, and 26 is in the second two-dimensional spectrometers
Slit, 27 be the reflecting mirror in the second two-dimensional spectrometer, and 28 be the reflective groove diffraction grating in the second two-dimensional spectrometer, 29
It is sample for the area array cameras in the second two-dimensional spectrometer, 30.
Specific embodiment
The utility model is described further with reference to the accompanying drawings and embodiments.
As shown in Figure 1, present embodiments provide it is a kind of can eliminate OCT conjugation mirror image determine difference two-way linear array spectral coverage OCT
Device, including super-radiance light emitting diode 1, collimator 2, the first beam splitter 3, the second beam splitter 4, third beam splitter 5, the 4th point
Beam mirror 6, the first cylindrical lens 7, the second cylindrical lens 8, third cylindrical lens 9, the first focusing objective len 10, the second focusing objective len 11, reflection
Mirror 12, the first two-dimensional spectrometer 13, the second two-dimensional spectrometer 14 and host computer 15；
The four direction of first beam splitter is respectively arranged with the first cylindrical lens, the second cylindrical lens, the second beam splitter,
Three beam splitters；Second beam splitter is provided with the first focusing objective len on a light direction, another light direction and
One light direction of four beam splitters is opposite；The second conglomeration is disposed on one light direction of the third beam splitter
Mirror and reflecting mirror, another light direction are opposite with another light direction of the 4th beam splitter；4th beam splitter is not
Third cylindrical lens are provided on a light direction opposite with the second beam splitter, third beam splitter；
The light that the super-radiance light emitting diode issues is collimated into a branch of directional light through the collimator；The directional light according to
Secondary to be divided into the equal two-beam of power by the first horizontal positioned cylindrical lens, the first beam splitter, a branch of is sample light, Yi Shuwei
Reference light；The sample light is successively irradiated by the second beam splitter and the first focusing objective len to sample after the outgoing of the first beam splitter
Product；The reference light is successively irradiated through third beam splitter, the second focusing objective len to reflecting mirror after the outgoing of the first beam splitter；Sample
The back-scattering light of product is emitted back towards the second beam splitter and is divided into the equal A mouth sample light and B mouthfuls of sample light of power, when A mouthfuls of sample light and
Interference is generated when the optical path difference of reference light is overlapped within light source coherent ranges and at the first beam splitter, the interfering beam is by water
Second cylindrical lens of placing flat are irradiated after collimating again to the first two-dimensional spectrometer；When the optical path difference of B mouthfuls of sample light and reference light
Interference, the third column which is positioned horizontally are generated when being overlapped within light source coherent ranges and at the 4th beam splitter
Lens are irradiated after collimating again to the second two-dimensional spectrometer；
First spectrometer is electrical connected with the host computer with the second spectrometer, passes through two spectrometers of PC control
The interference signal that the two-phase potential difference of synchronous acquisition sample is 90 °.
In the present embodiment, each spectrometer includes three cylindrical lens, a slit, a reflecting mirror, a reflection
Formula groove diffraction grating and an area array cameras；Interference signal is disposed with cylindrical lens, narrow in the optical path in spectrometer
Seam, cylindrical lens, reflecting mirror, reflective groove diffraction grating, cylindrical lens, area array cameras.
In the present embodiment, first beam splitter, the second beam splitter, third beam splitter and the 4th beam splitter composition are dry
The characteristics of interferometer, which combines Michelson interferometer and Mach-Zehnder interferometer.
The present embodiment additionally provide based on it is described above eliminate OCT conjugation mirror image determine difference two-way linear array spectral domain
The method of OCT device, comprising the following steps:
Step S1: the light that the superradiation light-emitting diode is launched is collimated into directional light by the collimator；
Step S2: then the directional light is divided into power by the first beam splitter by the first horizontal positioned cylindrical lens
Equal two-beam, a branch of is sample light, and a branch of is reference light；Sample light successively passes through the second beam splitter, the first focusing objective len
It is focused into line to irradiate to sample, reference light successively passes through third beam splitter, the second focusing objective len is focused into line and irradiates to reflecting mirror；
The back-scattering light of sample is divided into the equal A mouth sample light of power by the second beam splitter and B mouthfuls of sample light, reflecting mirror are reflected back
The light come is divided into the equal A mouth reference light and B mouthfuls of reference lights of power by third beam splitter；When A mouthfuls of sample light and reference light
A mouthfuls of interfering beams, the A mouthfuls of interfering beam quilt are generated when optical path difference is overlapped within light source coherent ranges and at the first beam splitter
The second horizontal positioned cylindrical lens are irradiated after collimating again to the first two-dimensional spectrometer；When the light path of B mouthfuls of sample light and reference light
B mouthfuls of interfering beams are generated when difference is overlapped within light source coherent ranges and at the 4th beam splitter, the B mouthfuls of interfering beam is horizontal
The third cylindrical lens of placement are irradiated after collimating again to the second two-dimensional spectrometer；
Step S3: adjusting the beam splitting microscope group of the second beam splitter and the 4th beam splitter composition, so that A mouthfuls of interference signals and B mouthfuls
The phase difference of interference signal is 90 °；
The interference signal of S4:A mouthfuls of step generations presses wavelength by the reflective groove diffraction grating in the first two-dimensional spectrometer
It is unfolded and is captured by area array cameras；The interference signal of B mouthfuls of generations is by the reflective groove diffraction light in the second two-dimensional spectrometer
Grid are unfolded by wavelength and are captured by area array cameras；Wherein, the acquisition multirow interference signal that area array cameras can be parallel, is captured
The formula of interference signal is expressed as shown in formula (1):
In formula, DC is direct current signal, and AC is each layer of sample arm from coherent signal, AnrIt is the intensity distribution function of light source,
AnmIndicate back-scattering light intensity distribution function of sample, InnIndicate sample arm direct current signal, IrrIndicate reference arm direct current,
znAnd zmIt is the light path of sample arm, zrIt is the light path of reference arm, k is wave number；
Step S5: signal weight is carried out to the interference signal for the out of phase that the area array cameras in two two-dimensional spectrometers is captured
Structure obtains the interference signal of complex field；
Step S6: Fast Fourier Transform (FFT) is carried out to the interference signal of complex field, except conjugation mirror image, obtains one axis of sample
Imaging to interface.
In the present embodiment, step S4 specifically includes the following steps:
Step S41: formula (1) is reduced to formula (4):
In formula, I0(k) indicate direct current signal with from the sum of coherent signal,For the conjunction phase of each reflecting layer interference signal
Position, φ are the phase difference of A mouthfuls with B mouthfuls of interference signals；
Its formula of interference signal for the area array cameras capture that S42:A mouthfuls of step is expressed as shown in formula (5), B mouthfuls of face battle array phase
Shown in its formula of the interference signal of machine capture such as formula (6):
Step S43: the direct current of acquisition reference arm and sample arm, the direct current signal and be concerned with certainly that button is gone in formula (5) (6)
Afterwards, formula (5), (6) are expressed are as follows:
By formula (7), the intensity and phase of the interference signal at each wavelength are calculated:
Step S44: the interference signal after reconstruct indicates are as follows:
Interference signal real part and imaginary part after reconstruct is as shown in figure 4, carry out the complex field interference signal after reconstruct quick
Fourier transformation can obtain the axial interface imaging of sample.As shown in figure 5, sample is located at 200 microns away from zero light path, comparison
Traditional linear array spectral coverage OCT measurement result in Fig. 2, Fig. 3 can be seen that the conjugation mirror image at -200 microns has obtained effective suppression
System.
The present embodiment can disposably obtain the two-dimentional interference signal that two phase differences of sample are 90 °, and use two
Two-dimensional spectrometer synchronizes acquisition to two interference signals.After the dc noise for deducting interference signal, conjugate lens are removed using two-phase
The method of picture reconstructs complex field interference signal, and carrying out Fast Fourier Transform (FFT) to complex field interference signal can get sample axial direction
Section imaging.Because system uses novel linear array interferometer structure to obtain phase difference for 90 ° of two two-dimentional interference signals, without moving
Phase device, so the phase difference of the interference signal obtained is not influenced by phase shifter performance with external environment.
It is noted that the utility model protection is hardware configuration, it is not claimed as control method.Above only
For a preferable embodiment in the utility model embodiment.But the utility model is not limited to the embodiment above, it is all
Any equivalent change and modification done by the utility model, range of the generated function without departing from this programme
When, belong to the protection scope of the utility model.
Claims (3)
1. one kind, which can eliminate OCT conjugation mirror image, determines difference two-way linear array spectral coverage OCT device, it is characterised in that: including superradiance
Light emitting diode, collimator, the first beam splitter, the second beam splitter, third beam splitter, the 4th beam splitter, the first cylindrical lens, second
Cylindrical lens, third cylindrical lens, the first focusing objective len, the second focusing objective len, reflecting mirror, the first two-dimensional spectrometer, the second two-dimentional light
Spectrometer and host computer；
The four direction of first beam splitter is respectively arranged with the first cylindrical lens, the second cylindrical lens, the second beam splitter, third point
Shu Jing；Second beam splitter is provided with the first focusing objective len on a light direction, another light direction and the 4th point
A light direction of Shu Jing is opposite；Be disposed on one light direction of the third beam splitter the second focusing objective len with
And reflecting mirror, another light direction are opposite with another light direction of the 4th beam splitter；4th beam splitter is not with
Third cylindrical lens are provided on an opposite light direction of two beam splitters, third beam splitter；
The light that the super-radiance light emitting diode issues is collimated into a branch of directional light through the collimator；The directional light successively passes through
Cross the first horizontal positioned cylindrical lens, the first beam splitter is divided into the equal two-beam of power, a branch of is sample light, a branch of for reference
Light；The sample light is successively irradiated by the second beam splitter and the first focusing objective len to sample after the outgoing of the first beam splitter；Institute
Reference light is stated after the outgoing of the first beam splitter, is successively irradiated through third beam splitter, the second focusing objective len to reflecting mirror；The back of sample
The second beam splitter is returned to scattering light emission and is divided into the equal A mouth sample light and B mouthfuls of sample light of power, when A mouthfuls of sample light and reference light
Optical path difference interference is generated when being overlapped within light source coherent ranges and at the first beam splitter, which is positioned horizontally
The second cylindrical lens collimate again after irradiate to the first two-dimensional spectrometer；When the optical path difference of B mouthfuls of sample light and reference light is in light source
Interference, the third cylindrical lens weight which is positioned horizontally are generated within coherent ranges and when being overlapped at the 4th beam splitter
It irradiates after new collimation to the second two-dimensional spectrometer；
First spectrometer is electrical connected with the host computer with the second spectrometer, synchronous by two spectrometers of PC control
Acquire the interference signal that the two-phase potential difference of sample is 90 °.
2. one kind according to claim 1, which can eliminate OCT conjugation mirror image, determines difference two-way linear array spectral coverage OCT device,
Be characterized in that: each spectrometer includes three cylindrical lens, a slit, a reflecting mirror, a reflective groove diffraction light
Grid and an area array cameras；Interference signal is disposed with cylindrical lens, slit, cylindrical lens, reflection in the optical path in spectrometer
Mirror, reflective groove diffraction grating, cylindrical lens, area array cameras.
3. one kind according to claim 1, which can eliminate OCT conjugation mirror image, determines difference two-way linear array spectral coverage OCT device,
It is characterized in that: first beam splitter, the second beam splitter, third beam splitter and the 4th beam splitter composition interferometer, the interference
Instrument combines the characteristics of Michelson interferometer and Mach-Zehnder interferometer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109297596A (en) * | 2018-11-09 | 2019-02-01 | 福州大学 | A kind of OCT conjugation mirror image of eliminating determines difference two-way linear array spectral coverage OCT device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109297596A (en) * | 2018-11-09 | 2019-02-01 | 福州大学 | A kind of OCT conjugation mirror image of eliminating determines difference two-way linear array spectral coverage OCT device and method |
| CN109297596B (en) * | 2018-11-09 | 2023-08-11 | 福州大学 | Phasing difference double-route array spectral domain OCT device and method capable of eliminating OCT conjugate mirror image |
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