CN109164063A - Method based on OCT and Digital image technology automatic measurement Refractive Index of Material - Google Patents
Method based on OCT and Digital image technology automatic measurement Refractive Index of Material Download PDFInfo
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- CN109164063A CN109164063A CN201810995078.XA CN201810995078A CN109164063A CN 109164063 A CN109164063 A CN 109164063A CN 201810995078 A CN201810995078 A CN 201810995078A CN 109164063 A CN109164063 A CN 109164063A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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Abstract
The invention discloses a kind of methods for being based on means of optical coherence tomography (OCT) and Digital image technology automatic measurement Refractive Index of Material.This refractive index measurement method is based on light path matching principle.Firstly, the tomography digital picture for obtaining baseline is scanned to vacant objective table using OCT；Then the tomography digital picture that OCT scan obtains sample is carried out to sample to be tested；Baseline chart and sample drawing are subjected to Digital image synthesis again, irregular surface scanning figure is formed, utilizes digital picture interaction technique, the measurement of the distance between selection and point of the point of sample boundaries and baseline is realized in measurement, the distance value principle of substitution formula calculates analysis to get sample refractive index is arrived.The present invention provides a wide range of, digitlization, new departure of rapid survey and new technology for the refractometry of the high refraction solid material of all kinds of solid materials, especially surface imperfection.
Description
Technical field
The present invention relates to solid material refractometry fields, more particularly to one kind to be based on OCT and Digital image technology certainly
The method of dynamic measurement of materials refractive index.
Background technique
The refractive index of all kinds of solid materials is a physical index of crucial importance, existing measurement method have prism method,
Polarization Method (test Brewster's angle), contact pin method, Abbe refractometer etc..And these methods measure being limited in scope for refractive index, than
Such as Abbe refractometer, the refractive index value of measurement requires material surface shape no more than 1.8.
Optical coherence tomography (OCT), is chiefly used in biological sample measurement at present, and the present invention has widened it using model
It encloses.The OCT system core is to imitate Michelson's interferometer: the light that pulse low-coherence light source issues is after fiber optic splitter, quilt
Uniformly it is divided into two beams, respectively enters reference arm and sample arm, returns by the reflected sample light of sample with mirror reflection
Reference light be coupled on detector through fiber optic splitter phase dry doubling again.Due to the low coherence of light source, sample is only come from
The reflected light of the reflected sample of one certain depth could be relevant with reference light, as light path matching principle.Coherence messages
Extracting mode multiplicity to be divided into time domain OCT and frequency domain OCT, but is concerned with and is all based on light path, and light path information corresponds to its scanning
Geometric distance in tomograph.Extract and can quickly measure using the geometric distance refractive index of material.
Before placing sample, i.e., when objective table is vacant, scanning obtains the tomograph of objective table, its position mark is in figure
y0, as corresponding baseline position.After placing sample, the location information y of sample upper surface is obtained1With the location information of lower surface
y2.Wherein upper surface y1All in air with the light path of the back wave of objective table, the two is sample in the geometric position difference of scanning figure
Geometric thickness d of the product in the scan line, and geometric distance difference of the upper and lower surfaces in scanning figure then corresponds to optical path difference
Nd, wherein n is the refractive index of material.Measuring principle is detailed in attached drawing 2.Digital image technology refers to and is converted into counting by picture signal
Word signal and the process that it is handled using computer.It can be very good to solve above-mentioned be previously mentioned with Digital image technology
OCT scan figure subsequent processing.
Summary of the invention
The problem of for background technique, the object of the present invention is to provide one kind to be based on OCT and digital picture
The method of technology automatic measurement Refractive Index of Material.This method is a kind of method for fast and automatically realizing light refractive index measurement, pole
Greatly expanded OCT image technology application prospect and for high refractive index solid material refractive index measurement provide it is convenient.
Technical solution of the invention the following steps are included: step a, firstly, being swept using OCT to vacant objective table
Retouch the tomography digital picture for obtaining baseline；Step b, consistent when keeping OCT, stage position with zero load, it is placed on objective table
Sample to be tested, and OCT scan is carried out to sample to be tested and obtains sample tomography digital picture；Step c, by baseline chart and sample drawing into
Row Digital image synthesis forms irregular surface scanning figure, and using digital picture interaction technique, algorithm realizes figure Boundary Extraction,
And to scheme to establish coordinate, boundary point coordinate is acquired along figure vertical direction, realizes the automatic measurement of distance between point；Step d, by point
Between apart from parameter value principle of substitution formula calculating analyze to obtain result.
Further, after obtaining OCT tomography digital picture, median filtering is carried out to figure by Digital image technology, it is excellent
Change image.
Further, the synthesis of baseline chart and Sample Scan figure is realized by Digital image technology.
Further, using the digital picture of synthesis, realize that the interaction of digital picture measures by programming, i.e., to composite diagram
Boundary carries out Straight Line Identification, obtains the distance feature between straight line.
Further, the method realizes that distance feature is calculated to the conversion of refractive index by light path matching principle.
Further, the light path matching principle are as follows: before placing sample, i.e., when objective table is vacant, adjust on reference arm
The light path that the light path and light that the position of reflective mirror transmits light in reference arm transmit in sample arm matches, if in sample arm
The position of stage surface is y0, after placing sample on objective table, the position of upper and lower surface is y1, y2.Refractive index n is calculated
Principle formula are as follows:。
Further, the refractive index value is statistical disposition multiple groups refractive index, obtained optimum index value.
The beneficial effects of the present invention are: the present invention is based on the sides of OCT and Digital image technology automatic measurement Refractive Index of Material
Method obtains image first with OCT twice sweep (primary unloaded, once to place sample), after image synthesis, in composite diagram,
Using digital picture interaction technique, refractive index repeatedly measures automatically and calculates completion, and OCT technology is enabled to measure refractive index technology
It realizes automation, digitlization, real time implementation, greatly expands its application prospect.
Detailed description of the invention
Attached drawing 1 is refractive index measurement method flow chart provided by the invention.
Attached drawing 2 is the Method And Principle schematic diagram of measurement refractive index provided by the invention.
Attached drawing 3 is the OCT scan figure of the unloaded figure of scanning and preferably diamond sample embodiment.
Attached drawing 4 is digital picture interaction results figure.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, embodiment pair with reference to the accompanying drawing
A specific embodiment of the invention elaborates.
It is as shown in Figure 1 and Figure 2: a method of it is described based on OCT and Digital image technology automatic measurement Refractive Index of Material
Method includes: step a: being scanned the digitized map for obtaining baseline to vacant objective table using means of optical coherence tomography
Picture；Step b: using means of optical coherence tomography to be placed on sample to be tested on objective table be scanned obtain sample number
Word image；Step c: carrying out Digital image synthesis for baseline chart and sample drawing, and using digital picture interaction technique, algorithm realizes c
Figure Boundary Extraction, and to scheme to establish coordinate, boundary point coordinate is acquired along figure vertical direction, realizes the automatic survey of distance between point
Amount；Step d: by the distance value principle of substitution formula, and summing and be averaged, sample optimum index value that you can get it.
As shown in Figure 3, Figure 4, Fig. 3 is the OCT scan figure of OCT scan zero load figure and preferred diamond sample embodiment；Fig. 3
It (a) is the baseline chart a for being scanned acquisition to vacant objective table using OCT technology；Fig. 3 (b) is using OCT technology to being placed on
Diamond on objective table, which is scanned, obtains sample drawing b；Fig. 3 (c) is the synthesis of the baseline chart and sample drawing realized by programming
c；Fig. 4 is the digital picture interaction results figure that the digital picture of diamond embodiment synthesis is formed using the interaction technique of image；Edge
Figure vertical direction P at certain intervals0、P1、P2、P3、P4, choose and acquire corresponding boundary point coordinate (y0, y1, y2), and carry out sample
Distance value measurement between product upper and lower surface, upper surface and baseline isWith, by the multiple groups distance value principle of substitution
Formula, by repeatedly measuring and analyzing, statistical disposition multiple groups refractive index is 2.4130.021 (known pure brill
2.417) industrial standard refractive index is.
In conclusion more preferred irregular diamond embodiment used herein is to a kind of base provided by the present invention
It is expounded in the method for OCT and Digital image technology automatic measurement Refractive Index of Material, the explanation of above embodiments is only used
Method and core concept of the invention are understood in help.The present invention is carried out referring to aforementioned separate embodiment although should be pointed out that
It is described in detail, but to those skilled in the art, without departing from the principle of the present invention, can also make
Several improvement, retouching and other solid material embodiments, these also should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of method based on OCT and Digital image technology automatic measurement Refractive Index of Material, it is characterised in that: including following step
It is rapid:
A, firstly, being scanned the tomography digital picture for obtaining baseline to vacant objective table using OCT；
B, holding OCT device location is constant, objective table height is constant, sample to be tested is placed on objective table, and treat test sample
Product carry out the tomography digital picture that OCT scan obtains sample；
C, baseline chart is synthesized into a figure by Digital image technology with sample drawing, and constructs xy coordinate system, then utilize number
Word image interaction technique successively extracts sample coboundary coordinate, baseline coordinate and sample lower boundary coordinate along scanning line direction；
D, result will be analyzed to obtain apart from the calculating of parameter value principle of substitution formula between three coordinate points.
2. a kind of method based on OCT and Digital image technology automatic measurement Refractive Index of Material according to claim 1,
Be characterized in that: the OCT wavelength model is optional, principle are as follows: the light that low-coherence light source issues is after fiber optic splitter, quilt
Uniformly it is divided into two beams, respectively enters reference arm and sample arm, returns by the reflected sample light of sample with mirror reflection
Reference light be coupled on detector through fiber optic splitter phase dry doubling again, herein for measuring unloaded baseline image and sample tomography
Image.
3. a kind of method based on OCT and Digital image technology automatic measurement Refractive Index of Material according to claim 1,
Be characterized in that: the Digital image technology is to realize the synthesis of image, feature extraction using computer software algorithm and interact survey
Amount.
4. a kind of side based on OCT and Digital image technology automatic measurement Refractive Index of Material according to claims 1 and 2
Method, it is characterised in that: the baseline chart is that the OCT faultage image of unloaded stage surface (is a straight line, referred to as base in image
Line).
5. a kind of side based on OCT and Digital image technology automatic measurement Refractive Index of Material according to claims 1 and 2
Method, it is characterised in that: the sample drawing be keep OCT and the position of objective table with it is unloaded when it is consistent, sample is placed in loading
OCT scan institute is at faultage image when on platform and immediately below OCT detection mouth.
6. a kind of according to claim 1, side based on OCT and Digital image technology automatic measurement Refractive Index of Material described in 3 and 4
Method, it is characterised in that: the step c identifies image boundary feature by algorithm, the coordinate system is to set the figure upper left corner to be straight
Angular coordinate system origin is to the right positive x-axis, is downwards positive y-axis, and the coordinate value for carrying out boundary point along OCT scan direction extracts,
The measurement between irregular obstacle body and boundary to the distance between baseline is carried out again.
7. a kind of method based on OCT and Digital image technology automatic measurement Refractive Index of Material according to claim 1,
Be characterized in that: the detection material is all solid materials, including surface imperfection solid material.
8. according to claim 1 with a kind of side based on OCT and Digital image technology automatic measurement Refractive Index of Material described in 5
Method, it is characterised in that: the refractive index value, which can be converted into, is programmed the automatic meter of realization using distance value and corresponding principle formula
It calculates and counts.
9. according to claim 1 with a kind of side based on OCT and Digital image technology automatic measurement Refractive Index of Material described in 8
Method, it is characterised in that: the principle formula are as follows: the light path matching principle and physics light path that OCT coherent measurement requires are corresponding
Faultage image location information: before placing sample, i.e., when objective table is vacant, its tomograph is scanned, the position of stage surface in figure
It is set to y0(as baseline position) is tightly attached to the lower surface of sample on objective table, is swept after placing sample on objective table
It retouches, in Sample Scan tomograph, if the position of sample upper surface is y1, the lower surface of sample is that position is y in figure2If sample
Refractive index is n, then has。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110793918A (en) * | 2019-11-13 | 2020-02-14 | 深圳市斯尔顿科技有限公司 | Industrial OCT detection device and method based on spatial free distribution light path |
| CN110836852A (en) * | 2019-11-13 | 2020-02-25 | 深圳市斯尔顿科技有限公司 | Industrial OCT detection device and method |
| CN111122505A (en) * | 2020-01-17 | 2020-05-08 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Image analysis and calibration system and method for digital refractometer |
| CN110793918B (en) * | 2019-11-13 | 2024-05-10 | 深圳市斯尔顿科技有限公司 | Industrial OCT detection device and method based on spatial free distribution light path |
-
2018
- 2018-08-29 CN CN201810995078.XA patent/CN109164063A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110793918A (en) * | 2019-11-13 | 2020-02-14 | 深圳市斯尔顿科技有限公司 | Industrial OCT detection device and method based on spatial free distribution light path |
| CN110836852A (en) * | 2019-11-13 | 2020-02-25 | 深圳市斯尔顿科技有限公司 | Industrial OCT detection device and method |
| CN110836852B (en) * | 2019-11-13 | 2024-03-26 | 深圳市斯尔顿科技有限公司 | Industrial OCT detection device and method |
| CN110793918B (en) * | 2019-11-13 | 2024-05-10 | 深圳市斯尔顿科技有限公司 | Industrial OCT detection device and method based on spatial free distribution light path |
| CN111122505A (en) * | 2020-01-17 | 2020-05-08 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Image analysis and calibration system and method for digital refractometer |
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Application publication date: 20190108 |