CN102735646A - Measuring apparatus and measuring method for refractive index of transparent medium - Google Patents
Measuring apparatus and measuring method for refractive index of transparent medium Download PDFInfo
- Publication number
- CN102735646A CN102735646A CN2012102048311A CN201210204831A CN102735646A CN 102735646 A CN102735646 A CN 102735646A CN 2012102048311 A CN2012102048311 A CN 2012102048311A CN 201210204831 A CN201210204831 A CN 201210204831A CN 102735646 A CN102735646 A CN 102735646A
- Authority
- CN
- China
- Prior art keywords
- laser
- sample
- refractive index
- outside gas
- photodetector
- 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
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention belongs to the technical field of laser measuring, and relates to a method for measuring the refractive index of a transparent medium by using laser longitudinal mode interval variations. According to the invention, adjacent longitudinal mode frequency intervals of laser outputs are adopted as measuring objects. When a sample requiring measuring is placed in, because the optical length of a laser resonant cavity is changed, the longitudinal mode intervals of the laser inputs are changed. The longitudinal mode intervals before and after the sample requiring measuring is placed are measured, such that the refractive index of the sample requiring measuring can be obtained by calculation. According to the invention, laser frequencies are introduced into the measuring of the refractive index. The sensitivity is substantially high, and the measuring result has a potential traceability.
Description
Technical field
The present invention relates to the laser measuring technique field, is measurement mechanism and the measuring method thereof of utilizing the laser longitudinal module interval variation to measure the transparent medium refractive index about a kind of.
Background technology
Refractive index is one of important physical parameter of material, also is the key factor that influences Performance of Optical System.The application of refractometry comprises the design and the processing of optical element, and the composition detection of industries such as food, medicine, chemical industry and product identify that film detects, crystalline material development, environmental monitoring and gemstone testing etc.To the ask for something higher system, the accurate measurement of refractive index is necessary condition.
Present refractometry method mainly comprises angle-measuring method, interferometric method, Fresnel formula method etc.Wherein angle-measuring method is to calculate refractive index through taking measurement of an angle, and comprises minimum deviation horn cupping, critical angle method (total reflection method), V prism method, autocollimation method, snell law, Brewster horn cupping etc.Interferometric method is utilized the light path change in the two-beam interference to measure and is calculated refractive index, comprises michelson interferometry, Mach-Ze De interferometric method, F-P interferometer mode, Rayleigh interferometric method, Young interference, equal thickness interference, equal inclination interference etc.The fresnel formula method is to utilize the reflection coefficient of measuring p or s polarized light to calculate refractive index.In addition, the measuring method of refractive index also comprises Moire fringe technique, spectroscopic methodology, ellipsometry method, kapillary focusing, three vacuum tube effective wavelength methods etc.
Yet traditional refractometry method and measurement mechanism can not be traced to the source, and precision is difficult to further improve, measurement range limited or processing and preparation complicacy.
Summary of the invention
In sum, necessary a kind of easy operating that has is provided, high sensitivity, high precision, and have the refractometry method and a measurement mechanism of tracing to the source possible.
A kind of measurement mechanism of transparent medium refractive index; Comprise: half outside gas laser; Said half outside gas laser comprises a gain tube and an output cavity mirror, and said output cavity mirror places the below of said gain tube, and with said gain tube common formation laserresonator is set at interval; One specimen holder, said specimen holder are arranged between said gain tube and the output cavity mirror, and in order to carry sample, said specimen holder comprises a light hole, and the laser that half outside gas laser is produced passes said light hole; One data acquisition and disposal system; Comprise polaroid, avalanche photodide and data handling system; Said polaroid is arranged at the below of said specimen holder; With the output frequency of different polarization direction in the laser that mixes the half outside gas laser generation, said avalanche photodide is arranged at the below of said polaroid, to survey beat frequency and to export beat frequency to data handling system.
A kind of measuring method of transparent medium refractive index; May further comprise the steps: a half outside gas laser is provided; Said half outside gas laser comprises a gain tube and an output cavity mirror, and said output cavity mirror places the below of said gain tube, and with said gain tube common formation laserresonator is set at interval; Said half outside gas laser operational mode is fundamental transverse mode, output continuously, and two above longitudinal modes vibrate simultaneously; Between said gain tube and output cavity mirror, a specimen holder is set, said specimen holder comprises a light hole, and the laser that said half outside gas laser produces passes said light hole; One data acquisition and disposal system are provided; Comprise polaroid, avalanche photodide and data handling system; Said polaroid is arranged at the below of said specimen holder; With the output frequency of different polarization direction in the laser that mixes the half outside gas laser generation, said avalanche photodide is arranged at the below of said polaroid, to survey longitudinal mode spacing and to export longitudinal mode spacing to data handling system; Read and write down the initial longitudinal mode spacing Δ when sample is not set by data handling system
0Sample is arranged at said specimen holder, and the laser that said half outside gas laser is sent passes the light hole of said sample and said specimen holder, and puts into the longitudinal mode spacing Δ behind the sample through data handling system record
nCalculate the refractive index of said sample through the longitudinal mode spacing formula.
A kind of measuring method of transparent medium refractive index; May further comprise the steps: a half outside gas laser is provided; Said half outside gas laser comprises a gain tube and an output cavity mirror, and said output cavity mirror places the below of said gain tube, and with said gain tube common formation laserresonator is set at interval; Said half outside gas laser operational mode is fundamental transverse mode, output continuously, and two above longitudinal modes vibrate simultaneously; Between said gain tube and output cavity mirror, a specimen holder is set, said specimen holder comprises a light hole, and the laser that said half outside gas laser produces passes said light hole; One data acquisition and disposal system are provided; Comprise first photodetector, second photodetector, wollaston prism, polaroid, avalanche photodide and data handling system; Said wollaston prism is positioned at said gain tube top; Adjacent longitudinal mode with two vertical polarizations in the laser of half outside gas laser output separates, and forms the two-way light intensity signal; Said first photodetector and second photodetector are positioned at the top of said wollaston prism, receiving the two-way light intensity signal that wollaston prism is told respectively, and export said two-way light intensity signal to data handling system; Adjustment output cavity mirror makes the output cavity mirror along the to-and-fro movement of laser axis direction; When the light intensity signal that first photodetector, second photodetector obtain equates, the initial longitudinal mode spacing Δ when obtaining sample is not set through polaroid, avalanche photodide and data handling system
0Sample is arranged at said specimen holder, and the laser that said half outside gas laser is sent passes the light hole of said sample and said specimen holder; Adjustment output cavity mirror makes the output cavity mirror along the to-and-fro movement of laser axis direction, when the light intensity signal that first photodetector, second photodetector obtain equates, through avalanche photodide with data handling system acquisition put into the longitudinal mode spacing Δ behind the sample
nCalculate the refractive index of said sample through the longitudinal mode spacing formula.
The measurement mechanism of transparent medium refractive index of the present invention and measuring method thereof are utilized laser longitudinal module variation at interval, put into the longitudinal mode spacing before and after the sample through measurement, can calculate the refractive index of sample.This detection method is simple to operate, and is highly sensitive, and has the potentiality that minimal stress such as unrelieved stress of being applied to detects demand, and measurement result has the potentiality of tracing to the source.
Description of drawings
Fig. 1 is the device synoptic diagram of the described transparent medium refractometry of first embodiment of the invention method.
Fig. 2 is the device synoptic diagram of the described transparent medium refractometry of second embodiment of the invention method.
Fig. 3 is the synoptic diagram at interval of laser longitudinal module described in the present invention.
The main element symbol description
| |
1 |
| Second photodetector | 2 |
| Wollaston prism | 3 |
| Gain tube | 4 |
| Specimen holder | 5 |
| The |
6 |
| |
7 |
| Polaroid | 8 |
| Avalanche |
9 |
| High |
10 |
| Gain |
11 |
| |
12 |
| |
13 |
Following specific embodiment will combine above-mentioned accompanying drawing to further specify the present invention.
Embodiment
Below will be described with reference to the accompanying drawings the measurement mechanism and the measuring method thereof of transparent medium refractive index provided by the invention.
As shown in Figure 1, first embodiment of the invention provides a kind of device and measuring method thereof of utilizing the laser longitudinal module interval variation to measure the transparent medium refractive index, and said device comprises half outside gas laser, specimen holder 5 and a data Collection & Processing System.
Said half outside gas laser is half outer (interior) cavity configuration not only as light source but also as sensor, two longitudinal modes (or many longitudinal modes), fundamental transverse mode pattern, and output continuously, said laser type can be gas laser, semiconductor laser and solid state laser etc.
Said half outside gas laser comprises gain tube 4, output cavity mirror 6.Preferably, said gain tube 4, output cavity mirror 6 is along the coaxial setting of the outbound course of laser.Said gain tube 4 comprises high anti-chamber mirror 10, and gain media 11, anti-reflection window 12 are along the coaxial setting of the outbound course of laser, and the anti-chamber of wherein said height mirror 10 is connected with gain media 11; Said gain media 11 upper ends are connected with the anti-chamber of said height mirror 10, and the lower end is connected with anti-reflection window 12, and working-laser material is contained in inside, and working-laser material can be gas, solid, semiconductor etc.; The concrete structure of said gain tube 4 can concrete structure be different according to gain media 11 differences, can select according to the experiment needs; Said anti-reflection window 12, the upper end is connected with said gain media 11, is coated with the anti-reflection film of optical maser wavelength.
Said output cavity mirror 6 places the below of said gain tube 4, and with said gain tube 4 common formation laserresonator is set at interval.
Specimen holder 5 is positioned at laser resonant cavity, and is concrete, and said specimen holder 5 is arranged between gain tube 4 and the said output cavity mirror 6.When the sample that is used to test is positioned over 5 last times of specimen holder, laser can be radiated on the said sample.The center of said specimen holder 5 has a light hole, and said laser can pass from said light hole.
Said data Collection & Processing System is to read beat frequency.Said data acquisition and disposal system comprise polaroid 8, avalanche photodide 9 and data handling system 13.Said polaroid 8 is used to mix the output frequency of different polarization direction after being positioned at said output cavity mirror 6; Said avalanche photodide 9, be positioned at said polaroid 8 after, be used to survey beat frequency and export data handling system 13 to; Said data handling system 13 is used for receiving and shows beat signal, like frequency spectrograph etc., also can be other devices with same frequency spectrum record and Presentation Function, is used for to calculate refractive index value.Among the present invention, said " on ", D score all is the basis with structure shown in Figure 1, direction and position relation.
First embodiment of the invention further provides a kind of device and measuring method thereof of utilizing the laser longitudinal module interval variation to measure the transparent medium refractive index, mainly may further comprise the steps:
In the 1st step, the laser work setting state is output continuously, and pattern is a fundamental transverse mode, and initial longitudinal mode number is more than or equal to two;
In the 2nd step, read and write down initial beat frequency value by data handling system, promptly initial longitudinal mode spacing Δ
0
The 3rd step, sample to be put on the said specimen holder 5, the laser that said half outside gas laser sends passes the light hole of said sample and said specimen holder 5, writes down the beat frequency value once more, promptly puts into the longitudinal mode spacing Δ behind the sample
n
The 4th goes on foot, and calculates the refractive index n of said sample.
The refractive index n of said sample can be pushed away by following principle formula:
The longitudinal mode spacing formula is:
H is the thickness of sample in the formula, and α is the angle of sample face normal and laser axis, as vertically putting into then cos α=1, n
0Be the medium refraction index around the sample.The refractive index of sample is:
（iii）。
If initial longitudinal mode number then writes down initial longitudinal mode spacing Δ greater than two
0With the longitudinal mode spacing Δ of putting into behind the sample
nThe time to note corresponding relation, i.e. Δ
0And Δ
nFor putting into the beat frequency value between the same group of longitudinal mode in sample front and back.In addition; From formula, can find out; When the length l of laserresonator changes a less numerical value; Poor
of said longitudinal mode spacing promptly produces bigger variation, and therefore the measuring method of said refractive index has very high sensitivity.
Please with reference to Fig. 2, second embodiment of the invention provides a kind of device that utilizes the laser longitudinal module interval variation to measure the transparent medium refractive index, and said device comprises half outside gas laser, specimen holder 5 and a data Collection & Processing System.Basic identical among the measurement mechanism of transparent refractive index and first embodiment in the second embodiment of the invention; Its difference is; Said half outside gas laser can further comprise a piezoelectric ceramics 7; Said piezoelectric ceramics 7 is fixed with said output cavity mirror 6, thereby can drive output cavity mirror 6 along the to-and-fro movement of laser axis direction.Be appreciated that said piezoelectric ceramics 7 is a selectable unit, said piezoelectric ceramics 7 also can be replaced by other microkinetic elements, as long as can drive 6 to-and-fro movements of output cavity mirror; Said data acquisition and disposal system further comprise one first photodetector 1, second photodetector 2 and wollaston prism 3, thereby form the register system of a robotization.
Said data acquisition and disposal system comprise first photodetector 1, second photodetector 2, wollaston prism 3, polaroid 8, avalanche photodide 9, data handling system 13.Wherein:
Wollaston prism 3 is positioned at said gain tube 4 tops, thereby the adjacent longitudinal mode of two vertical polarizations is separated;
Polaroid 8 is positioned at said output cavity mirror 6 belows, is used to mix the output frequency of different polarization direction;
Avalanche photodide 9 is positioned at said polaroid 8 belows, is used to survey beat frequency and exports data handling system 13 to;
The said method of utilizing the laser longitudinal module interval variation to measure the transparent medium refractive index of second embodiment of the invention comprises the steps:
In the 1st step, the laser work setting state is output continuously, and its pattern is a fundamental transverse mode, and initial longitudinal mode number is more than or equal to two;
In the 2nd step, survey respectively by the light intensity signal that vibrates on wollaston prism 3 and first photodetector 1, second photodetector, the 2 pair of orthogonal directions;
The 3rd step; Regulate output cavity mirror 6 along the to-and-fro movement of laser axis direction; When the light intensity signal that is obtained by first photodetector 1, second photodetector 2 equates (isocandela point); Obtain beat signal through polaroid 8, avalanche photodide 9 and data handling system 13, write down initial beat frequency value, promptly initial longitudinal mode spacing Δ
0
The 4th step, sample to be put on the said specimen holder 5, the method according to the 2nd step and the 3rd goes on foot writes down the beat frequency value once more when isocandela point, promptly put into the longitudinal mode spacing Δ behind the sample
nIf initial longitudinal mode number then writes down initial longitudinal mode spacing Δ greater than two
0With the longitudinal mode spacing Δ of putting into behind the sample
nThe time to note corresponding relation, i.e. Δ
0And Δ
nFor putting into the beat frequency value between the same group of longitudinal mode in sample front and back;
In the 5th step, the refractive index n of sample can be pushed away by following principle formula:
The longitudinal mode spacing formula is:
（i）
（ii）
H is the thickness of sample in the formula, and α is the angle of sample face normal and laser axis, n
0Be the medium refraction index around the sample.The refractive index of sample is:
（iii）。
Further, in the above-mentioned steps process, data handling system 13 output control voltages are controlled the flexible of piezoelectric ceramics 7, thereby are driven output cavity mirror 6 along the to-and-fro movement of laser axis direction.Piezoelectric ceramics 7 drives in the process of output cavity mirrors 6 motions, can continuous recording three times or longitudinal mode spacing repeatedly, and take the mean, thereby reduce error, improve the precision of measuring.
Be illustrated in figure 3 as laser longitudinal module synoptic diagram at interval.Longitudinal mode spacing, the frequency interval between two promptly adjacent laser longitudinal modules is represented with Δ.
Concrete, as a specific embodiment of this measurement mechanism, said laser instrument adopts half external cavity helium neon laser, the reflectivity R of its high anti-chamber mirror and output cavity mirror
1And R
2Be respectively 99.8% and 99%, the distance between them, promptly the laser resonance cavity length is L ≈ 300mm; Gain tube length 260mm, effective capillary pipe length 200mm wherein, in be filled with the He-Ne mixed gas, the inflation ratio is:
He
3:?Ne
20:Ne
22=9:0.5:0.5；
Anti-reflection window is fixed on an end of gain tube; Piezoelectric ceramics is fixed on the output cavity mirror, and under the input voltage effect, it can promote the output cavity mirror and move along the laser axis direction, makes the inswept gain trace of laser resonance frequency; Sample is a K4 glass, diameter 14mm, thickness 1.2mm; Sample is placed on the specimen holder, and there is light hole at the specimen holder center, and laser passes from the hole during measurement; Under the enough big situation of laser tube gain, sample can be put into the chamber perpendicular to the laser axis, and said laser vertical is in the surperficial incident of said sample; Gain when not enough at laser tube, but a little rotary sample seat makes sample face normal and laser axis have a little angle, theoretically exist an angle can make the reflection loss on the sample drop to enough little with experiment showed; The output light of laser instrument shines on the avalanche photodide to survey beat frequency through polaroid, and the output signal of avalanche photodide is sent to frequency spectrograph and shows.
In addition, those skilled in the art also can do other and change in spirit of the present invention, and these all should be included in the present invention's scope required for protection according to the variation that the present invention's spirit is done certainly.
Claims (8)
1. the measurement mechanism of a transparent medium refractive index comprises:
Half outside gas laser, said half outside gas laser comprise a gain tube and an output cavity mirror, and said output cavity mirror places the below of said gain tube, and with said gain tube common formation laserresonator are set at interval;
One specimen holder, said specimen holder are arranged between said gain tube and the output cavity mirror, and in order to carry sample, said specimen holder comprises a light hole, and the laser that half outside gas laser is produced passes said light hole;
One data acquisition and disposal system; Comprise polaroid, avalanche photodide and data handling system; Said polaroid is arranged at the below of said specimen holder; With the output frequency of different polarization direction in the laser that mixes the half outside gas laser generation, said avalanche photodide is arranged at the below of said polaroid, to survey beat frequency and to export beat frequency to data handling system.
2. the measurement mechanism of transparent medium refractive index as claimed in claim 1 is characterized in that, said data acquisition and disposal system further comprise one first photodetector, second photodetector and a wollaston prism; Said wollaston prism is arranged at the top of said gain tube, separates with the adjacent longitudinal mode with two vertical polarizations in the laser of half outside gas laser output, forms the two-way light intensity signal; Said first photodetector and second photodetector are positioned at the top of said wollaston prism, receiving the two-way light intensity signal that wollaston prism is told respectively, and export said two-way light intensity signal to data handling system.
3. the measurement mechanism of transparent medium refractive index as claimed in claim 1 is characterized in that, further comprises a piezoelectric ceramics, and said piezoelectric ceramics and said output cavity mirror are fixedly linked, to control the axis to-and-fro movement of said output cavity mirror along laser.
4. the measuring method of a transparent medium refractive index may further comprise the steps:
One half outside gas laser is provided; Said half outside gas laser comprises a gain tube and an output cavity mirror; Said output cavity mirror places the below of said gain tube; And with said gain tube common formation laserresonator is set at interval, said half outside gas laser operational mode is fundamental transverse mode, output continuously, and two above longitudinal modes vibrate simultaneously;
Between said gain tube and output cavity mirror, a specimen holder is set, said specimen holder comprises a light hole, and the laser that said half outside gas laser produces passes said light hole;
One data acquisition and disposal system are provided; Comprise polaroid, avalanche photodide and data handling system; Said polaroid is arranged at the below of said specimen holder; With the output frequency of different polarization direction in the laser that mixes the half outside gas laser generation, said avalanche photodide is arranged at the below of said polaroid, to survey longitudinal mode spacing and to export longitudinal mode spacing to data handling system;
Read and write down the initial longitudinal mode spacing Δ when sample is not set by data handling system
0
Sample is arranged at said specimen holder, and the laser that said half outside gas laser is sent passes the light hole of said sample and said specimen holder, and puts into the longitudinal mode spacing Δ behind the sample through data handling system record
n
Calculate the refractive index of said sample through the longitudinal mode spacing formula.
5. the measuring method of transparent medium refractive index as claimed in claim 4 is characterized in that, sample is put into the chamber perpendicular to the laser axis, and said laser vertical is in sample surfaces incident.
6. the measuring method of transparent medium refractive index as claimed in claim 4 is characterized in that, the refractive index of said sample is calculated through following formula:
, wherein, h is the thickness of sample, α is the angle of sample face normal and laser axis, n
0Be the medium refraction index around the sample, c is the light velocity, and Λ is for putting into the poor of sample front and back longitudinal mode spacing.
7. like the measuring method of the said transparent medium refractive index of claim 4; It is characterized in that; Comprise that further one makes said output cavity mirror along the reciprocating step of laser axis, and continuous recording three times or longitudinal mode spacing repeatedly, ask said vertical intermembranous separated mean value as Δ
n
8. the measuring method of a transparent medium refractive index may further comprise the steps:
One half outside gas laser is provided; Said half outside gas laser comprises a gain tube and an output cavity mirror; Said output cavity mirror places the below of said gain tube; And with said gain tube common formation laserresonator is set at interval, said half outside gas laser operational mode is fundamental transverse mode, output continuously, and two above longitudinal modes vibrate simultaneously;
Between said gain tube and output cavity mirror, a specimen holder is set, said specimen holder comprises a light hole, and the laser that said half outside gas laser produces passes said light hole;
One data acquisition and disposal system are provided; Comprise first photodetector, second photodetector, wollaston prism, polaroid, avalanche photodide and data handling system; Said wollaston prism is positioned at said gain tube top; Adjacent longitudinal mode with two vertical polarizations in the laser of half outside gas laser output separates, and forms the two-way light intensity signal; Said first photodetector and second photodetector are positioned at the top of said wollaston prism, receiving the two-way light intensity signal that wollaston prism is told respectively, and export said two-way light intensity signal to data handling system;
Regulate the output cavity mirror along the to-and-fro movement of laser axis direction; When the light intensity signal that first photodetector, second photodetector obtain equates, the initial longitudinal mode spacing Δ when obtaining sample is not set through polaroid, avalanche photodide and data handling system
0
Sample is arranged at said specimen holder, and the laser that said half outside gas laser is sent passes the light hole of said sample and said specimen holder;
Regulate the output cavity mirror along the to-and-fro movement of laser axis direction, when the light intensity signal that first photodetector, second photodetector obtain equates, obtain to put into the longitudinal mode spacing Δ behind the sample through polaroid, avalanche photodide and data handling system
n
Calculate the refractive index of said sample through the longitudinal mode spacing formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210204831.1A CN102735646B (en) | 2012-06-20 | 2012-06-20 | Measuring apparatus and measuring method for refractive index of transparent medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210204831.1A CN102735646B (en) | 2012-06-20 | 2012-06-20 | Measuring apparatus and measuring method for refractive index of transparent medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102735646A true CN102735646A (en) | 2012-10-17 |
| CN102735646B CN102735646B (en) | 2014-08-27 |
Family
ID=46991532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210204831.1A Expired - Fee Related CN102735646B (en) | 2012-06-20 | 2012-06-20 | Measuring apparatus and measuring method for refractive index of transparent medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102735646B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998284A (en) * | 2012-11-30 | 2013-03-27 | 清华大学 | Measurement device and measurement method for transparent medium refractive index |
| CN103018200A (en) * | 2012-11-30 | 2013-04-03 | 清华大学 | Monitoring device and method for refractive index of transparent medium |
| CN103105377A (en) * | 2012-11-30 | 2013-05-15 | 清华大学 | Device and method for measuring refractive index of transparent medium |
| CN103185550A (en) * | 2013-03-13 | 2013-07-03 | 清华大学 | Rotation angle measurement method |
| CN103278475A (en) * | 2013-05-13 | 2013-09-04 | 清华大学 | Measuring device and method of transparent medium refractive index |
| CN105784317A (en) * | 2016-03-21 | 2016-07-20 | 南京信息工程大学 | Dual-wavelength optical system and plasma flow field electron number density measuring method |
| CN109632706A (en) * | 2018-12-19 | 2019-04-16 | 南京信息职业技术学院 | Method for measuring liquid refractive based on equal thickness interference Moire fringe |
| CN111198169A (en) * | 2019-11-08 | 2020-05-26 | 桂林电子科技大学 | Microstructure optical fiber high resolution three-dimensional refractive index testing method |
| CN113092385A (en) * | 2021-05-10 | 2021-07-09 | 山东大学 | Middle and high-rise atmospheric refractive index measuring device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4125484A1 (en) * | 1991-08-01 | 1993-02-04 | Deutsche Aerospace | Laser optical sensor measuring method for determining refractive indices - introducing varying refractive index medium to cause frequency shift or modulation of solid state laser |
| JP2007057376A (en) * | 2005-08-24 | 2007-03-08 | National Institute Of Advanced Industrial & Technology | Refractive index measuring instrument using fabry-perot interferometer |
| CN102435584A (en) * | 2010-09-16 | 2012-05-02 | 佳能株式会社 | Measuring method of refractive index and measuring apparatus of refractive index |
-
2012
- 2012-06-20 CN CN201210204831.1A patent/CN102735646B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4125484A1 (en) * | 1991-08-01 | 1993-02-04 | Deutsche Aerospace | Laser optical sensor measuring method for determining refractive indices - introducing varying refractive index medium to cause frequency shift or modulation of solid state laser |
| JP2007057376A (en) * | 2005-08-24 | 2007-03-08 | National Institute Of Advanced Industrial & Technology | Refractive index measuring instrument using fabry-perot interferometer |
| CN102435584A (en) * | 2010-09-16 | 2012-05-02 | 佳能株式会社 | Measuring method of refractive index and measuring apparatus of refractive index |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998284A (en) * | 2012-11-30 | 2013-03-27 | 清华大学 | Measurement device and measurement method for transparent medium refractive index |
| CN103018200A (en) * | 2012-11-30 | 2013-04-03 | 清华大学 | Monitoring device and method for refractive index of transparent medium |
| CN103105377A (en) * | 2012-11-30 | 2013-05-15 | 清华大学 | Device and method for measuring refractive index of transparent medium |
| CN103018200B (en) * | 2012-11-30 | 2015-02-18 | 清华大学 | Monitoring device and method for refractive index of transparent medium |
| CN103185550A (en) * | 2013-03-13 | 2013-07-03 | 清华大学 | Rotation angle measurement method |
| CN103185550B (en) * | 2013-03-13 | 2015-08-12 | 清华大学 | The measuring method of rotational angle |
| CN103278475B (en) * | 2013-05-13 | 2015-06-24 | 清华大学 | Measuring device and method of transparent medium refractive index |
| CN103278475A (en) * | 2013-05-13 | 2013-09-04 | 清华大学 | Measuring device and method of transparent medium refractive index |
| CN105784317A (en) * | 2016-03-21 | 2016-07-20 | 南京信息工程大学 | Dual-wavelength optical system and plasma flow field electron number density measuring method |
| CN109632706A (en) * | 2018-12-19 | 2019-04-16 | 南京信息职业技术学院 | Method for measuring liquid refractive based on equal thickness interference Moire fringe |
| CN109632706B (en) * | 2018-12-19 | 2021-03-02 | 南京信息职业技术学院 | Liquid refractive index measuring method based on equal-thickness interference moire fringes |
| CN111198169A (en) * | 2019-11-08 | 2020-05-26 | 桂林电子科技大学 | Microstructure optical fiber high resolution three-dimensional refractive index testing method |
| CN113092385A (en) * | 2021-05-10 | 2021-07-09 | 山东大学 | Middle and high-rise atmospheric refractive index measuring device and method |
| CN113092385B (en) * | 2021-05-10 | 2022-03-22 | 山东大学 | Middle and high-rise atmospheric refractive index measuring device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102735646B (en) | 2014-08-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102735646B (en) | Measuring apparatus and measuring method for refractive index of transparent medium | |
| CN100504287C (en) | Surface plasma resonance measurement mechanism and method thereof | |
| CN103954589B (en) | The precision measurement apparatus of a kind of optical material specific refractory power and method | |
| CN102183486B (en) | Gas refractive index measurer and measuring method thereof based on optical frequency comb | |
| WO2016154780A1 (en) | Laser interference wavelength lever-type absolute distance measurement apparatus and method | |
| WO2012062096A1 (en) | Method and device for measuring air refractive index based on laser synthetic wavelength interference | |
| CN102735430B (en) | Method and device for detecting phase delay | |
| CN104596989A (en) | Method for measuring refractive index distribution of transparent medium on basis of interference fringe image processing | |
| CN105092530B (en) | The absolute method of measurement of optical parallel optical heterogeneity | |
| CN104215176A (en) | High accuracy optical interval measurement device and method | |
| CN102589423A (en) | Micro-nano three-dimensional contact scanning measurement probe | |
| CN108917895B (en) | Cantilever Liang Motai frequency-based mass weighing device and method | |
| CN102998284B (en) | Measurement device and measurement method for transparent medium refractive index | |
| CN110631514B (en) | Pentagonal prism type angle sensing measurement device and method based on multi-longitudinal mode self-mixing effect | |
| CN102323237B (en) | Rapid high-precision absolute measurement device for refractive index of air and measurement method thereof | |
| RU155509U1 (en) | LASER-INTERFERENCE HYDROPHONE WITH THERMOSTABILIZATION SYSTEM | |
| CN103185550A (en) | Rotation angle measurement method | |
| CN103185665B (en) | The measuring method of birefringence element optical axis | |
| CN103075966A (en) | Displacement measuring system | |
| CN103196865B (en) | Measure the measuring method of birefringence element thickness and refractive index simultaneously | |
| CN110806397B (en) | Liquid concentration sensing measurement device and method based on multi-longitudinal-mode self-mixing effect | |
| CN103278475B (en) | Measuring device and method of transparent medium refractive index | |
| CN102221535A (en) | Three-vacuum-tube-based gas refraction index measurer | |
| CN103018200B (en) | Monitoring device and method for refractive index of transparent medium | |
| CN103105377B (en) | Device and method for measuring refractive index of transparent medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20210620 |