CN106510613A - Optical phase retarder for measuring length of ocular axis - Google Patents
Optical phase retarder for measuring length of ocular axis Download PDFInfo
- Publication number
- CN106510613A CN106510613A CN201611096046.3A CN201611096046A CN106510613A CN 106510613 A CN106510613 A CN 106510613A CN 201611096046 A CN201611096046 A CN 201611096046A CN 106510613 A CN106510613 A CN 106510613A
- Authority
- CN
- China
- Prior art keywords
- angle
- angle prism
- prism
- optical phase
- hypotenuse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/102—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for optical coherence tomography [OCT]
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Ophthalmology & Optometry (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Eye Examination Apparatus (AREA)
Abstract
The invention relates to an optical phase retarder for measuring the length of the ocular axis. The optical phase retarder comprises a fixed first right-angle prism and two movable right-angle prisms. The second right-angle prism and the third right-angle prism are stacked vertically and located on a transverse movement platform. The transverse movement platform is driven by a motor to move, and therefore the second right-angle prism and the third right-angle prism move synchronously. The hypotenuses of the three right-angle prisms have the same angle, thereby being in fit on a straight line. Light ray of a light source achieves incidence and penetrating through the right-angle edge of the second right-angle prism or the third right-angle prism, reaches the right-angle edge of the first right-angle prism in a vertical incidence mode through the hypotenuse of the first right-angle prism, is reflected through a high-reflection film plated on the hypotenuse of the first right-angle prism and returns back in the same way, the light source is not moved, the transverse movement platform moves, and the light ray reaches the two right-angle prisms in an incidence mode to produce the distance difference so as to achieve phase delay. Linear scanning is achieved, no aberration is introduced, the structure is simple, the cost is low, and whole-eye scanning of the anterior segment and the posterior segment of the eye is achieved.
Description
Technical field
The present invention relates to a kind of medical optical instrument, more particularly to a kind of optical phase put-off for axiallength measurement
Device.
Background technology
The measurement of axiallength is the principle or ultrasound detection based on the interference of light, and interference of light method can realize non-connecing
Touch, high-resolution and it is quick the features such as, and ultrasonic power needs to contact eyes, and resolution ratio is low, and ultrasonic probe is that have pressure to eye
Eyeball can all cause the precision of measurement result ensure.In interference of light method, using partially coherent or low coherence interference technology, light
Source using the light source that has the spatial coherence of certain bandwidth good, in terms of interferometry, the light degree phase of reference arm and sample arm
In the coherence length less than light source can just realize interfering.In order to realize the measurement of axiallength, one is needed axially
The optical phase put-off line of scanning, matches reference arm and differs phase less than light source from the position of sample different depth with sample arm
Dry length, realizes being gathered by the interference signal of cornea to eye ground.
In optical coherence tomography system, the axial optical phase put-off line of report includes at present：1st, linear translation
Speculum, this is most simple and most long axial scan mode；Simple structure, low cost, but main defect is volume
Greatly, working line is long, and stability is affected by frame for movement；2nd, piezoelectricity control parallel mirror；Dependable performance, stability
Height, but price is high, and sweep limits is limited, the axiallength measurement of the scope that is not suitable for exposing thoroughly；3rd, swept using revolving cube
Retouch mode；The scope that exposes thoroughly can be realized using the scanning of this mode, but installation and debugging are difficult, and scanning be not it is linear,
There are dispersion, dutycycle low, need algorithm to coordinate；4th, rotational micromirror array, mission nonlinear, have dispersion, have certain dutycycle,
Capacity usage ratio is low, it is excessively complicated to adjust, and high cost is not suitable for high-volume industrialization.5th, involute spiral mirror；Height can be realized
The advantages of speed, good linearity, simple regulation, the scope that exposes thoroughly, non-dispersive, but making required precision is too high, it is practical to be difficult.It is existing
Stage, widely used was the binary channels proposed by the Fujimoto groups of america's MIT in the reference arm of TD-OCT systems
Rapid scanning delay line (Double pass rapid scanning optical delay line, RSOD), passes through
The Phase and group velocities of optical grating diffraction effect independent control scanning, are provided simultaneously with dispersion adjustment ability.System architecture is complicated, unit
Part is more, and debugging is difficult, the problems such as high cost.
The content of the invention
The present invention be directed to the problem that axial optical phase put-off line is present, it is proposed that a kind of for axiallength measurement
Optical phase delay device, measures axiallength based on optics low coherence interference principle, i.e., by the geometrical length of cornea to retina,
Need the device of a phase delay or axial scan, using phase compensation in interferometry principle design variable phase or
The delayer of axiallength measurement, the present invention is in the fixed bit phase delay 2 of setting（n-1）In the case of s, can with it is before eyes section and
Oculi posterior segment is scanned, and realizes the scanning of full eye.
The technical scheme is that：A kind of optical phase delay device for axiallength measurement, including maintaining static
The first right-angle prism and two transportable second and the 3rd right-angle prism, second and the 3rd right-angle prism mounted on top position
On a translation stage, translation stage is motor driven movement, makes second and the 3rd right-angle prism synchronizing moving, the 3rd right-angle prism
For right-angled trapezium prism, the second right-angle prism is right angled triangle, and the hypotenuse of three right-angle prisms all has identical angle, makes
The hypotenuse of three right-angle prisms point-blank fit, as laminating side, as translation stage is moved, second and the 3rd right angle
Prism can be along the movement of laminating side, and source light passes through the right-angle side incidence of the second right-angle prism or the 3rd right-angle prism and passes through
Afterwards, the right-angle side of the first right-angle prism is impinged perpendicularly on through the first right-angle prism hypotenuse, then by the right angle of the first right-angle prism
Backtracking after the highly reflecting films reflection plated on side, light source are motionless, and the second right-angle prism right angle is incided in translation stage movement, light
On side and to incide range difference on the 3rd right-angle prism right-angle side be s.
The refractive index of three right-angle prisms is identical.
Described second and the 3rd right-angle prism incidence movable length of the right-angle side under electrode drive be L, right-angle prism
Refractive index is n, and air refraction is n0, the second right-angle prism right-angle side with the angle on side of fitting isa, that is, it is coated with high reflection
First right-angle prism right-angle side of film with the angle on side of fitting isa, then the optical phase delay device is in translation stage motion scan
When total optics optical path difference be：
。
The beneficial effects of the present invention is：Optical phase delay device of the present invention for axiallength measurement, scan mode
For linear；Simple structure；Low cost；And the scope of required scanning is little, speed is fast；After very advantageously realizing anterior ocular segment and eye
The full eye scanning of section；Two prisms constitute an optical flat, and collimated ray vertical incidence, aberrationless are introduced；Meanwhile, prism
Using low dispersion, optical glass having high refractive index, the impact of system dispersion is eliminated, high index of refraction can reduce sweep length and can
To realize large area scanning.
Description of the drawings
Fig. 1 is optical phase delay device structural representation of the present invention for axiallength measurement；
Fig. 2 is two right-angle prism geometrical relationship figures in optical phase delay device of the present invention.
Specific embodiment
In order to realize high stability, expose thoroughly scope, the purpose of quick axiallength measurement, is prolonged using prism axial direction optics
Technology realizes the quick scanning of anterior ocular segment and oculi posterior segment late, finally realizes that axiallength is measured；Specific measures for implementation are：As schemed
Optical phase delay device structural representation shown in 1, axial scan optical delay line is by fixed big right-angle prism 1 and can be with
Mobile right-angle prism 2 and 3 is constituted；Right-angle prism 2 and 3 mounted on top are located on a translation stage 5, by translation stage 5 in motor 6
Right-angle prism 2 and 3 synchronizing movings are made under driving；Right-angle prism 3 is, by square or rectangular right-angle prism, to remove part little straight
The arm of angle, is formed and the right-angle prism of right-angled trapezium is fitted or be directly processed into 2 hypotenuse of triangular right-angle prism, and three straight
The hypotenuse of angle prism all has identical angle so that the hypotenuse of three right-angle prisms is point-blank fitted, dotted line in Fig. 1
For side of fitting, as translation stage 5 is moved, right-angle prism 2 and 3 can be along the movement of laminating side；Source light pass through right-angle prism 2 or
The right-angle side of right-angle prism 1 is impinged perpendicularly on after the right-angle side incidence of right-angle prism 3, then by plating on the right-angle side of right-angle prism 1
Highly reflecting films 4 reflect after backtracking original optical path.Two right-angle prisms 2 as shown in Figure 2 and 3 geometrical relationship figures, right-angle prism 2
Angle with side of fitting isa, and 1 right-angle side of right-angle prism of highly reflecting films 4 and the angle on side of fitting are coated with, light source is motionless,
Translation stage 5 is moved, and light is incided on 2 right-angle side of right-angle prism and the range difference that incides on 3 right-angle side of right-angle prism is s,
In right-angle prism 2 and 3 translation motions, what the variable quantity of the axial scan depth or light degree phase of generation can be as shown in Figure 2
Relation is calculated.
If Motor drive translational movement is L；Light source starts incidence, mobile translation stage from 2 incident right-angle side summit of right-angle prism
5, make 2 incident right-angle side of light source opposing right angles prism move down into the base of 3 incident right-angle side of right-angle prism from summit, then axial light
Learn phase-delay quantity may be calculated：
Wherein, n is the refractive index of three right-angle prisms（The refractive index of three right-angle prisms is identical）, n0For air refraction, one
As be 1；From axial optics optical path difference phase delay calculating formula of length, optics optical path difference and motor-driven translational movement L
It is in direct ratio, axial optical phase put-off in this way be linear change, displacement motor amount L is set in systems and is surveyed
Quantity sensor, as long as the numerical value for measuring L just can linearly correspond to axial optical path difference；This displacement transducer can select magnetic grid
Displacement transducer, it is also possible to select the resolution ratio of grating displacement sensor, sensor to be better than 10um.Right-angle prism 2 and 3 is one
Special optical texture, i.e. it is s that the incident right-angle side of right-angle prism 2 and 3 has a range difference；The advantage of this spline structure is, incident
Light from 2 right-angle side of right-angle prism be transitioned into 3 right-angle side of right-angle prism when, in axial scan, optics optical path difference has an individual mutation, 2
(n-1) s, sweep limits so directly can be jumped to the scope on eyeground from anterior ocular segment, and right-angle prism 2 can be with other words
For the axial scan of anterior ocular segment, right-angle prism 3 is across the vitreum in eyes directly by optical phase put-off to eyeground view
Film, realizes the measurement of full axiallength.The foundation of so design be exactly the length of vitreum between anterior ocular segment and oculi posterior segment about
For 16mm, the tissue on this segment distance is optically considered uniform, no any interface, thus scanning is complete at the moment can be with
The direct surface sweeping oculi posterior segment in this part is skipped, oculi posterior segment optics optical path difference total when scanning may be calculated：
In all prisms make, glass adopts high index of refraction, the material of low dispersion.System non-dispersive is so can guarantee that, and is swept
Retouching scope can be less.
Claims (3)
1. it is a kind of for axiallength measurement optical phase delay device, it is characterised in that including fixed first right angle
Prism and two transportable second and the 3rd right-angle prism, second and the 3rd right-angle prism mounted on top positioned at one translate
On platform, translation stage is motor driven movement, makes second and the 3rd right-angle prism synchronizing moving, and the 3rd right-angle prism is right-angled trapezium
Prism, the second right-angle prism are right angled triangle, and the hypotenuse of three right-angle prisms all has identical angle, three for making right angle
The hypotenuse of prism is point-blank fitted, as laminating side, as translation stage is moved, second and the 3rd right-angle prism can be along
The movement of laminating side, the right-angle side that source light passes through the second right-angle prism or the 3rd right-angle prism are incident and after passing through, Jing Guo
One right-angle prism hypotenuse impinges perpendicularly on the right-angle side of the first right-angle prism, then the height plated on the right-angle side of the first right-angle prism
Backtracking after reflectance coating reflection, light source are motionless, translation stage movement, and light incides on the second right-angle prism right-angle side and incident
Range difference on the 3rd right-angle prism right-angle side is s.
2. the optical phase delay device of axiallength measurement is used for according to claim 1, it is characterised in that described three straight
The refractive index of angle prism is identical.
3. the optical phase delay device of axiallength measurement is used for according to claim 2, it is characterised in that second He
3rd right-angle prism incidence movable length of the right-angle side under electrode drive is L, and the refractive index of right-angle prism is n, air refraction
Rate is n0, the second right-angle prism right-angle side with the angle on side of fitting isa, that is, be coated with highly reflecting films the first right-angle prism it is straight
The arm of angle with the angle on side of fitting isa, then the optical phase delay device optics optical path difference total in translation stage motion scan be：
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611096046.3A CN106510613B (en) | 2016-12-02 | 2016-12-02 | Optical phase delay device for axiallength measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611096046.3A CN106510613B (en) | 2016-12-02 | 2016-12-02 | Optical phase delay device for axiallength measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106510613A true CN106510613A (en) | 2017-03-22 |
| CN106510613B CN106510613B (en) | 2018-03-13 |
Family
ID=58354544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611096046.3A Active CN106510613B (en) | 2016-12-02 | 2016-12-02 | Optical phase delay device for axiallength measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106510613B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113419339A (en) * | 2021-04-07 | 2021-09-21 | 电子科技大学 | Optical delay structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0433008A2 (en) * | 1989-12-11 | 1991-06-19 | Konica Corporation | Laser interferometric measuring apparatus |
| US20090027683A1 (en) * | 2007-03-27 | 2009-01-29 | Yokogawa Electric Corporation | Interferometer, demodulator, and splitting element |
| CN201212838Y (en) * | 2008-07-16 | 2009-03-25 | 中国科学院上海光学精密机械研究所 | Space phase shifter used for synchronous phase shifting interferometer |
| JP2012013574A (en) * | 2010-07-01 | 2012-01-19 | Optical Comb Inc | Optical type measurement device and prism for interferometer of the same |
| CN103256991A (en) * | 2013-05-08 | 2013-08-21 | 中国科学院上海光学精密机械研究所 | Spatial phase shift lateral shearing interferometer |
| CN204129323U (en) * | 2014-08-06 | 2015-01-28 | 张建平 | The total-reflection type prism assemblies of digital micro mirror projection light engine |
| CN204909391U (en) * | 2015-07-24 | 2015-12-30 | 广东福地新视野光电技术有限公司 | OCT reference arm structure and OCT imaging system |
-
2016
- 2016-12-02 CN CN201611096046.3A patent/CN106510613B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0433008A2 (en) * | 1989-12-11 | 1991-06-19 | Konica Corporation | Laser interferometric measuring apparatus |
| US20090027683A1 (en) * | 2007-03-27 | 2009-01-29 | Yokogawa Electric Corporation | Interferometer, demodulator, and splitting element |
| CN201212838Y (en) * | 2008-07-16 | 2009-03-25 | 中国科学院上海光学精密机械研究所 | Space phase shifter used for synchronous phase shifting interferometer |
| JP2012013574A (en) * | 2010-07-01 | 2012-01-19 | Optical Comb Inc | Optical type measurement device and prism for interferometer of the same |
| CN103256991A (en) * | 2013-05-08 | 2013-08-21 | 中国科学院上海光学精密机械研究所 | Spatial phase shift lateral shearing interferometer |
| CN204129323U (en) * | 2014-08-06 | 2015-01-28 | 张建平 | The total-reflection type prism assemblies of digital micro mirror projection light engine |
| CN204909391U (en) * | 2015-07-24 | 2015-12-30 | 广东福地新视野光电技术有限公司 | OCT reference arm structure and OCT imaging system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113419339A (en) * | 2021-04-07 | 2021-09-21 | 电子科技大学 | Optical delay structure |
| CN113419339B (en) * | 2021-04-07 | 2023-08-08 | 电子科技大学 | Optical retardation structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106510613B (en) | 2018-03-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3742112B1 (en) | Apparatus and method for measuring surface topography optically | |
| CN102679866B (en) | System and method for optical coherence tomography | |
| US20120200859A1 (en) | Frequency-domain oct | |
| CN101884524B (en) | Wide view field optical coherence tomographic instrument based on adaptive optical technology | |
| US7417741B2 (en) | Transmissive scanning delay line for optical coherence tomography | |
| CN112577446B (en) | In-place surface shape splicing measuring device and method for large-caliber planar optical element | |
| US9019576B2 (en) | Scanning apparatus with patterned probe light | |
| EP2223039A2 (en) | Eye length measurement apparatus | |
| CN108606777A (en) | Optoacoustic computed tomography system based on adjustable focus type fibre optical sensor | |
| CN110455221A (en) | A kind of light channel structure and equipment of rapid survey optical mirror slip radius of curvature | |
| CN112147080B (en) | Free space type Mueller OCT imaging system and method for full-automatic time division detection | |
| WO2022062049A1 (en) | Beam splitter-based imaging device integrating anterior segment oct and biometer functions | |
| CN106510644A (en) | Medical optical coherence tomography two-dimensional forward scanning probe based on fiber optics bundle | |
| CN106510613B (en) | Optical phase delay device for axiallength measurement | |
| CN110631512A (en) | External incident type angle sensing measuring device and method for bi-orthogonal plane mirror based on multi-longitudinal-mode self-mixing effect | |
| CN101750146B (en) | Adjustable frequency domain optical coherence chromatography imaging method and system thereof | |
| CN109459414A (en) | Optical image-measuring device | |
| CN208188476U (en) | A kind of twin shaft that achievable entrance pupil position is constant scanning OCT optical front-end system | |
| CN102499628A (en) | Three-dimensional imaging device and method with image stabilizing function for retina of human eye of living body | |
| CN111184502A (en) | Method and apparatus for generating fast scanning optical phase delay line | |
| CN1584533A (en) | Optical fibre connector face geometrical parameter measuring instruments | |
| TWI336765B (en) | Method and device for interface profile inspecting of optical components | |
| CN114739509B (en) | Quadrilateral common-path time modulation interference spectrum imaging device and method | |
| CN114739512B (en) | W-type common-path time modulation interference spectrum imaging device and method | |
| CN114236510B (en) | Laser radar transmissivity stray light test system for measuring water depth |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |