CN106370625A - V-prism refractometer based on autocollimation and CCD (Charge Coupled Device) visual technology - Google Patents
V-prism refractometer based on autocollimation and CCD (Charge Coupled Device) visual technology Download PDFInfo
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- CN106370625A CN106370625A CN201610990076.2A CN201610990076A CN106370625A CN 106370625 A CN106370625 A CN 106370625A CN 201610990076 A CN201610990076 A CN 201610990076A CN 106370625 A CN106370625 A CN 106370625A
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- 230000000007 visual effect Effects 0.000 title abstract description 4
- 238000005259 measurement Methods 0.000 claims abstract description 38
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- 239000011521 glass Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 12
- 230000004438 eyesight Effects 0.000 claims description 12
- 230000004313 glare Effects 0.000 claims description 12
- 230000013011 mating Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000003384 imaging method Methods 0.000 abstract description 4
- 206010052128 Glare Diseases 0.000 description 10
- 230000021615 conjugation Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005342 prism glass Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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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
Abstract
The invention discloses a V-prism refractometer based on an autocollimation and CCD (Charge Coupled Device) visual technology and belongs to the technical field of photoelectric detection. The V-prism refractometer comprises a light source, an optical filter component, autocollimators, a V groove, a combined lens group, a CCD camera I, a CCD camera II and a computer. The V-prism refractometer is a device for realizing orthogonal calibration of the V groove position by adopting an autocollimation technology; a digital imaging system of the CCD camera is adopted for the measurement of a deflecting angle, and is quick in measurement, accurate in read, simple in structure, low in cost and high in measurement precision; the glass refraction index can be measured quickly and stably, and the measurement efficiency is improved while the detection precision is guaranteed. The computer is used for performing program control on an optical filter wheel, so that the switch time of the optical filter is shortened; the structure is simple, and no angle measurement driving mechanism and servo mechanism are arranged in the system, so that errors brought by the angle measurement driving mechanism and the servo mechanism can be avoided; meanwhile, the measurement time is shortened, and the measurement efficiency is improved; the V groove calibration is realized by adopting the autocollimation technology, and the measurement precision is improved.
Description
Technical field
The invention belongs to photoelectric detection technology field, especially relate to a kind of v based on auto-collimation and ccd vision technique
Refraction by prism instrument.
Background technology
With the development of optics and photoelectric instrument, the requirement more and more higher to glass refraction.Traditional v prism glass refraction
Rate measuring instrument, is directed at reading mechanism using complicated ray machine, by human eye by finder telescope be aligned, optical circle reading, people
Work calculates glass refraction.
With the development of image processing techniquess and Computer Control Technology, occur in that the digital picture based on ccd be aligned and
The digitized v refraction by prism instrument of photoelectric reading although to a certain extent, improves the accuracy of detection and automatically of glass refraction
Change degree, but still suffer from following deficiency: one, because system structure is complicated, error component is more, such as the backlash of drive mechanism, volume
Code device angle measurement accuracy and motor control precision etc. all can cause measurement error；2nd, due to polarizers of big angle scope scanning be aligned will be carried out,
Compared to traditional v refraction by prism instrument, testing efficiency substantially reduces；3rd, do not possess V-shaped groove calibration function in equipment it is impossible to protect
Card V-shaped groove is aligned with collimator orthogonality, is easily introduced the systematic error of glass refraction.
Patent No. 201220371462.0, the utility model patent of entitled " digital v refraction by prism instrument " discloses
A kind of digital v refraction by prism instrument, this device includes collimator, carrier system and auto-collimator successively by light path, and
Collection outgoing deflects the ccd video camera of picture, and the light-splitting device that this device is mainly characterized by installing inside auto-collimator will enter
Penetrate light and be divided into two bundles, wherein a branch of for eye-observation adjust light path, another bundle be used for ccd collected by camera image.Gathered by ccd
Deviation light, obtains the picture having a plurality of colour horizontal line, records deviation angle according to different colours spectral line position difference.Autocollimatic
Straight telescope is used for adjusting itself and collimator, the light shaft coaxle of ccd video camera.The major defect of this measurement apparatus is: one,
Collimator, carrier system and auto-collimator are fixed on base by support column, by leveling screw and the elevation angle
Adjusting screw, reaches the purpose of adjustment collimator and auto-collimator two optical axis coincidence, and this method adjusting accuracy is low, and
Precision cannot quantify.2nd, pass through auto-collimator imaging on ccd camera, due to the restriction of auto-collimator, make
Obtain deflection angle measurement range little, be not suitable for large view field measurement.3rd, using colored ccd camera, processing speed is slow, poor real.
Therefore needing badly in the middle of prior art wants a kind of new technical scheme to solve this problem.
Content of the invention
The technical problem to be solved is: provides a kind of v refraction by prism based on auto-collimation and ccd vision technique
Instrument, for solving digitized v refraction by prism instrument complex structure of the prior art, measurement error is big, and testing efficiency is low, measures model
Enclose the technical problem such as little.
Based on the v refraction by prism instrument of auto-collimation and ccd vision technique, it is characterized in that: include light source, optical filter box, from
Collimation collimator, v groove, compound lens group, ccd camera, ccd camera and computer,
It is incident to auto-collimation collimator after filtered assembly of the launching light of described light source；Described optical filter box loads
On optical filter wheel；Described auto-collimation collimator include clouded glass, the veiling glare door screen that disappears, graticle, spectroscope, ccd camera and
Collimation lens set；Described clouded glass, disappear veiling glare door screen, graticle, spectroscope and collimation lens set are along the launching light incidence side of light source
To setting gradually；Described graticle is located on the focal plane of auto-collimation collimator；Described ccd camera is located at spectroscopical anti-
Penetrate in light path；Described v groove is located between auto-collimation collimator and compound lens group；Described compound lens group includes image-forming objective lens
And half-reflecting half mirror；The side of described image-forming objective lens is adjacent with groove, and the opposite side of image-forming objective lens is adjacent with half-reflecting half mirror；Described
Ccd camera is located on the focal plane of compound lens group；Described ccd camera forms conjugate planes with ccd camera；Described calculating
Machine is connected with optical filter wheel, ccd camera, ccd camera and ccd camera respectively.
The optical filter of described optical filter box is loaded by optical filter wheel, by computer according to the program control selection of measurement demand.
Described graticle is bright narrow slit structure.
By above-mentioned design, the present invention can bring following beneficial effect:
The present invention is a kind of device realizing the calibration of V-shaped groove location orthogonality using auto-collimation technology, using ccd camera
Digital imaging system carries out the angular surveying of deflection angle, and measurement is quick and reading is accurate, and structure is simple, low cost, certainty of measurement
High, be capable of the measurement glass refraction of fast and stable it is ensured that accuracy of detection improves measurement efficiency simultaneously.
The present invention realizes the light shaft coaxle of auto-collimation collimator and measurement ccd using the image space of ccd camera
Calibration；Using half-reflecting half mirror and conjugation double ccd camera extension measurable angle range, deviation light is directly by image-forming objective lens and ccd camera
Receive, increased the measurement range of deflection angle, be suitable for big deviation angular measurement；Auto-collimation collimator is used for adjustment V-shaped groove location
With the orthogonality of collimator place axle, adjusting accuracy height.
The present invention passes through computer program-control optical filter wheel, reduces optical filter switching time；Structure is simplified, and does not exist in system
Angle measurement drive mechanism and servo control mechanism, can avoid the error that they introduce, and shorten time of measuring simultaneously, improve measurement efficiency；Adopt
Realize the calibration of v groove with auto-collimation technology, improve certainty of measurement；In addition, in big deviation angular measurement, using half-reflecting half mirror with altogether
Yoke double ccd camera extension measurable angle range.
Brief description
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated:
Fig. 1 is the fundamental diagram based on the v refraction by prism instrument of auto-collimation and ccd vision technique for the present invention.
Fig. 2 is the measuring principle figure based on the v refraction by prism instrument of auto-collimation and ccd vision technique for the present invention.
Fig. 3 is the computational mathematics sketch based on the v refraction by prism instrument of auto-collimation and ccd vision technique for the present invention.
In figure 1- light source, 2- optical filter box, 3- auto-collimation collimator, 4-v groove, 5- compound lens group, 6-ccd camera
, 7-ccd camera, 8- computer, 301- clouded glass, 302- disappear veiling glare door screen, 303- graticle, 304- spectroscope, 305-ccd
Camera, 306- collimation lens set, 501- image-forming objective lens, 502- half-reflecting half mirror.
Specific embodiment
As shown in figure 1, the v refraction by prism instrument based on auto-collimation and ccd vision technique, it is characterized in that: include light source 1, filter
Mating plate assembly 2, auto-collimation collimator 3, v groove 4, compound lens group 5, ccd camera 6, ccd camera 7 and computer 8,
It is incident to auto-collimation collimator 3 after filtered assembly 2 of the launching light of described light source 1；Described optical filter box 2
It is loaded on optical filter wheel；Described auto-collimation collimator 3 includes clouded glass 301, the veiling glare door screen 302 that disappears, graticle 303, light splitting
Mirror 304, ccd camera 305 and collimation lens set 306；Described clouded glass 301, the veiling glare door screen 302 that disappears, graticle 303, spectroscope
304 and collimation lens set 306 set gradually along the launching light incident direction of light source 1；It is parallel that described graticle 303 is located at auto-collimation
On the focal plane of light pipe 3；Described ccd camera 305 is located on the reflected light path of spectroscope 304；Described v groove 4 is located at auto-collimation
Between collimator 3 and compound lens group 5；Described compound lens group 5 includes image-forming objective lens 501 and half-reflecting half mirror 502；Described
The side of image-forming objective lens 501 is adjacent with v groove 4, and the opposite side of image-forming objective lens 501 is adjacent with half-reflecting half mirror 502；Described ccd phase
Machine 7 is located on the focal plane of compound lens group 5；Described ccd camera 6 and ccd camera 7 form conjugate planes；Described computer
8 are connected with optical filter wheel, ccd camera 6, ccd camera 7 and ccd camera 305 respectively.
Described optical filter box 2, using loading some optical filters on optical filter wheel, controls optical filter wheel rotation by computer 8
Turn, for different light sources, the corresponding optical filter of program control selection, realize optical filter automatic exchange.
Using the veiling glare door screen 302 that disappears before graticle 303 in described auto-collimation collimator 3, for shielding external stray light shadow
Ring.
, using carefully bright narrow slit structure, traditional graticle is with bright slit for graticle 303 in described auto-collimation collimator 3
Concealed wire do misalignment angle contrast, described graticle 303 has been substituted for thin bright slit, this carefully bright slit very thin, be equivalent to
Concealed wire in former bright slit, is positioned on the focal plane of auto-collimation collimator 3, for forming bright slit image image, as right
Quasi goal.So according to image sub-pixel subdivision technology, can get sub-pixel subdivision alignment line, improve certainty of measurement.
Increase ccd camera 305 and spectroscope 304 in auto-collimation collimator 3, realize photoelectric auto-collimation function, reach
To v groove 4 and the calibration of auto-collimation collimator 3 optical axis orthogonality.
Constitute digital imaging system using ccd camera 6, ccd camera 7 and image-forming objective lens 501, narrow by v groove 4 outgoing
Seam collimated beam becomes slit image on ccd camera 6 or ccd camera 7, obtains deviation angle to this as carrying out process.
Using ccd camera 6, ccd camera 7 as the slit collimation light beam deviation angle of indirect measurement v groove 4 outgoing
Detector.
For realizing large-range measuring, visual field extension is carried out using the double ccd camera of conjugation.Warp after the imaged object lens of light 501
Half-reflecting half mirror 502 occurs reflection and transmission, ccd camera 6 and ccd camera 7 to be located at conjugate planes simultaneously, realizes double-view field and spells
Connect, increase measurement angular range.
As shown in Fig. 2 wherein, d is ccd camera 6 to the measuring principle of the present invention or ccd camera 7 receives bright slit image
Displacement, f ' is compound lens group focal length.There is deviation in light after v groove 4, deflection angle is θ, imaged object lens 501, and half anti-half
Lens 502 become slit image on camera, by measuring its image height d, as shown in Figure 3, are obtained by formula, can obtain through v groove 4
Light deflection angular dimension afterwards.By fundamental formularTry to achieve refractive index n, n in formula0For v prism
Refractive index, θ is deviation angle during beam projecting v prism, and n is glass refraction to be measured.
According to the present invention it is based on v its effect of refraction by prism instrument of auto-collimation and ccd vision technique: by computer
8 program control optical filter wheels, reduce optical filter switching time；Structure is simplified, and there is not angle measurement drive mechanism and servo control mechanism in system,
The error that they introduce can be avoided, shorten time of measuring simultaneously, improve measurement efficiency；Realize the school of v groove 4 using auto-collimation technology
Standard, improves certainty of measurement；In addition, in big deviation angular measurement, being ccd phase using half-reflecting half mirror 502 and the double ccd camera of conjugation
Machine 6, ccd camera 7ccd extension measurable angle range.
Refractometer according to the present invention, before glass refraction measurement, needs the new v groove 4 changed is calibrated.Its tool
Body principle is as follows: filtered assembly 2 of the light being sent by spectroscopic light source 1 filters, after the even light of clouded glass 301, then through the veiling glare door screen that disappears
302 elimination veiling glares, form single slit bright line by graticle 303, realize through collimation lens set 306 through after spectroscope 304
Light collimates, and incides the polished surface of v groove 4, and the reflected light producing on this surface passes through collimation lens set 306, through spectroscope
304 reflections reach ccd camera 305, and ccd camera 305 is connected with computer 8, and computer 8 gathers to ccd camera 305
To image processed, picture position and reference position are shown over the display, operator can be according to position deviation to v groove
4 enter orthogonality of lines adjustment, until two positions overlap, now explanation v groove 4 is perpendicular to the optical axis of auto-collimation collimator 3, finally solid
Determine the base of v groove 4, realize v groove 4 and calibrate.
After v groove 4 calibration, carry out glass refraction measurement, concrete operating principle is as follows: the light that spectroscopic light source 1 sends is through filter
During mating plate assembly 2, control optical filter wheel in this assembly to rotate through computer 8 and select respective filter to be filtered, measured
Required monochromatic light, through the even light of clouded glass 301, disappear veiling glare door screen 302 elimination veiling glare, and graticle 303 forms single slit bright line, passes through
Realize light collimation through collimation lens set 306 after spectroscope 304, through v groove 4 and test product emergent light, deviation, imaged thing occur
After mirror 501, half-reflecting half mirror 502 light splitting, single slit bright line is imaged on ccd camera 6 and ccd camera 7.Wherein, ccd phase
Machine 6 and ccd camera 7 are in conjugate position, realize field stitching by image processing software, increase measurement visual field.Substitute into formulaCalculate glass refraction n, n in formula0For v Refractive Index of Glass Prism, θ is beam projecting v rib
Deviation angle during mirror, n is glass refraction to be measured.
Claims (3)
1. the v refraction by prism instrument based on auto-collimation and ccd vision technique, is characterized in that: includes light source (1), optical filter box
(2), auto-collimation collimator (3), v groove (4), compound lens group (5), ccd camera (6), ccd camera (7) and computer
(8),
It is incident to auto-collimation collimator (3) after filtered assembly (2) of the launching light of described light source (1)；Described filter set
Part (2) is loaded on optical filter wheel；Described auto-collimation collimator (3) includes clouded glass (301), disappear veiling glare door screen (302), graduation
Plate (303), spectroscope (304), ccd camera (305) and collimation lens set (306)；Described clouded glass (301), the veiling glare that disappears are late
(302), graticle (303), spectroscope (304) and collimation lens set (306) set successively along the launching light incident direction of light source (1)
Put；Described graticle (303) is located on the focal plane of auto-collimation collimator (3)；Described ccd camera (305) is located at light splitting
On the reflected light path of mirror (304)；Described v groove (4) is located between auto-collimation collimator (3) and compound lens group (5)；Described group
Close lens group (5) and include image-forming objective lens (501) and half-reflecting half mirror (502)；The side of described image-forming objective lens (501) and groove (4)
Adjacent, the opposite side of image-forming objective lens (501) is adjacent with half-reflecting half mirror (502)；Described ccd camera (7) is located at compound lens
On the focal plane of group (5)；Described ccd camera (6) forms conjugate planes with ccd camera (7)；Described computer (8) respectively with filter
Mating plate wheel, ccd camera (6), ccd camera (7) and ccd camera (305) connect.
2. the v refraction by prism instrument based on auto-collimation and ccd vision technique according to claim 1, is characterized in that: described filter
The optical filter of mating plate assembly (2) is loaded by optical filter wheel, passes through the program control selection of computer (8) according to measurement demand.
3. the v refraction by prism instrument based on auto-collimation and ccd vision technique according to claim 1, is characterized in that: described point
Drawing plate (303) is bright narrow slit structure.
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| CN201610990076.2A CN106370625A (en) | 2016-11-10 | 2016-11-10 | V-prism refractometer based on autocollimation and CCD (Charge Coupled Device) visual technology |
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| CN201610990076.2A CN106370625A (en) | 2016-11-10 | 2016-11-10 | V-prism refractometer based on autocollimation and CCD (Charge Coupled Device) visual technology |
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Cited By (5)
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| CN106841111A (en) * | 2017-04-13 | 2017-06-13 | 云南电网有限责任公司电力科学研究院 | A kind of V prisms measure the method and device of soil refractive index |
| CN107144553A (en) * | 2017-05-27 | 2017-09-08 | 贵州电网有限责任公司电力科学研究院 | A kind of Ultraluminescence detects SF6SO in electrical equipment2The device and method of content |
| CN108844920A (en) * | 2018-05-28 | 2018-11-20 | 成都光明光电股份有限公司 | V Refractive Index of Glass Prism batching method of testing based on graticle angle groove stepping |
| CN109142276A (en) * | 2018-09-27 | 2019-01-04 | 成都光明光电股份有限公司 | V prism refractometer and test optical material are to the method for the refractive index of wavelength 852.1nm light |
| CN109557047A (en) * | 2017-09-26 | 2019-04-02 | 株式会社岛津制作所 | Refractive index measuring apparatus and detecting refractive index method |
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| CN109142276A (en) * | 2018-09-27 | 2019-01-04 | 成都光明光电股份有限公司 | V prism refractometer and test optical material are to the method for the refractive index of wavelength 852.1nm light |
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