CN106124415A - Optical rotation method for real-time measurement based on pixel polarisation camera and measurement apparatus - Google Patents
Optical rotation method for real-time measurement based on pixel polarisation camera and measurement apparatus Download PDFInfo
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- CN106124415A CN106124415A CN201610412067.5A CN201610412067A CN106124415A CN 106124415 A CN106124415 A CN 106124415A CN 201610412067 A CN201610412067 A CN 201610412067A CN 106124415 A CN106124415 A CN 106124415A
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- 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
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Abstract
The invention discloses a kind of optical rotation method for real-time measurement based on pixel polarisation camera and measurement apparatus, including light source (11), the polarizer (12), polarization tube (14) and pixel polarisation camera (16), the present invention is relative to based on rotating analyzer or wave plate polarized light detection method, manufactured goods need not rotate analyzer, save analyzing link, optical rotatory substance optical rotation can be measured in real time, improve and measure efficiency.Relative to tradition polariscope, the present invention detects based on digital information, it is to avoid personal error, improves accuracy of detection；The method of the present invention can be used for the real-time measurement of the optically-active solution of varied concentration.
Description
Technical field
The present invention relates to the technical field of polariscope, can analyze and determine the concentration of material, content and purity etc., specifically come
Saying, the present invention proposes a kind of brand-new sample optical rotation measuring method, and it is based on pixel polarisation camera dynamic extraction and analysis
There is the light intensity of the incident illumination of random polarization state and the characteristic of the image information of polarization, it is achieved the real-time survey of sample optical rotation
Amount.
Background technology
Optical rotation phenomenon refers to when line polarized light passes through Cucumber, and the direction of propagation with light is revolved by its vibration plane for axle
Turning, this material is referred to as optical rotatory substance, and the angle making the polarized light plane of oscillation rotate is called the optical rotation of this material, optical rotatory substance
Optical rotationThe sample path length L passed through to optical rotatory substance liquor capacity percent concentration C and polarized light is directly proportional, its formula
For: Its proportionality coefficientIt is referred to as specific rotatory power.Polariscope is exactly the instrument measuring material optical rotation.Survey at present
The method of quantity of material optical rotation mainly has based on rotating analyzer analyzing measuring method, measurement side based on rotating wave plate analyzing
Method.
In Chinese patent CN102841057 A, Hu Zaiguo, Wang Shiyuan mention rotation analyzer to realize optical activity solution dense
The measurement of degree, as shown in Figure 1.Wherein, light source 11 selects single wavelength light source, sends non-polarized light；The polarizer 12 is by non-polarized light
Being filtered into line polarized light, through plane of polarization one angle q of rotation of the line polarized light of polarization tube 14, operator uses at analyzer 15 end
Eye observation anglec of rotation q.As in figure 2 it is shown, wherein, analyzer area of visual field trisection, zone line is to increase after the polarizer
Wave plate, areas at both sides is separately not add any device；Owing to people's visual imaging regards for the sensitivity of contrast, the zero degree in b
Field is easier to find；The zero degree visual field number of degrees that before and after reading interpolation optical rotatory substance, analyzer is corresponding, optical rotation is obtain for twice
The difference of angle.Wave plate is placed on after the polarizer, makes vibration plane change, and observes, at analyzer, three partial field of view that light and shade is different
(abbreviation three share vision field).Rotating analyzer makes the demarcation line of three share vision field disappear, the most referred to as zero degree visual field, record inspection now
Device angular readings q partially1.Put into sample, occur that three share vision field, the direction of regulation analyzer polaroid make three share vision field be changing into zero
Degree visual field, record reading q now2, then optical rotationThis just brings two problems: one. due to polarizer slice and
The accuracy relation that checking bias slice regulates relative to position manual observation, can cause that systematic error is big, precision is low；Two. due to analyzing process
In need to rotate checking bias slice, make optical rotation detection can not reach live effect.
At non-patent literature " solution concentration method of measuring based on polarized light detection " (Changchun University of Science and Technology's journal
(natural science edition), Vol.38No.1Feb.2015) in, Li Zhigang et al. proposes a kind of polarized light detection based on rotating wave plate
Survey the measuring method of solution concentration.Use PIN photodiode that the polarized light signal with solution concentration information is detected,
And data are sent to host computer by serial ports, utilize LabVIEW program to carry out data and process and display；By rotating wave plate,
Collect the curve of sine transform, calculate two sine curve phase delay angle before and after adding sample and i.e. can get optical rotation
This measuring method can reduce measurement error, improve certainty of measurement, and user interface is friendly, result intuitive display.But rotation
Turn the time delay that wave plate process unavoidably causes optical rotation to measure.It is proposed that a kind of can the inspection of measuring samples optical rotation in real time
Survey method, for polariscope industry and related application field, significant.
In non-patent literature " real-time polarization based on micro-polaroid array and phase information measure technology " (Chinese science skill
Art University Ph.D. Dissertation, author's Zhang Zhigang, tutor Zhang Qingchuan) in, Zhang Zhigang refer to reality based on micro-polaroid array
Time polarization information measure technology, pixel polarisation camera based on micro-polaroid array can extract calculate line polarized light angle.
Summary of the invention
It is an object of the invention to: the present invention propose a kind of based on pixel polarization camera optical rotation method for real-time measurement and
Measurement apparatus, this pixel polarization camera can be with extract real-time and the light intensity of the incident illumination analyzing random polarization state and polarization information
(schematic diagram is as shown in Figure 3), the corner through the linearly polarized light of optical rotatory substance can be monitored in real time, saves conventional measuring method
In analyzer and operation in rotate the process of analyzer, solve optical rotation measure can not be real-time problem.This method optically-active
Material optical rotation, specific rotatory power, the measurement of solution concentration can realize real time implementation, automatization, precision.
Detecting in real time for realizing optical rotation based on pixel polarization camera, the present invention uses below scheme:
A kind of optical rotation real-time measurement apparatus based on pixel polarisation camera, including light source, the polarizer, polarization tube and pixel
Polarisation camera, light source provides single-wavelength light illumination, and the single-wavelength light that light source is sent by the polarizer is filtered into line polarized light, polarization tube
For holding optical rotatory substance container, pixel polarisation camera receives, records final polarized light information；Light source center and polarizer optical frames
The over glaze heart, polarization tube axle center, pixel polarisation camera photosensitive target surface center are on same straight line, and side is parallel, it is ensured that light path
Unimpeded.
Wherein, light source is single longitudinal mode laser light source or low-pressure sodium lamp
Wherein, the polarizer is high-performance standard linear polarizer.
Wherein, polarization tube is standard polarization tube.
Wherein, pixel polarisation camera is the camera apparatus that can receive and process polarized light polarization information.
The present invention also provides for the method for real-time measurement of a kind of optical rotation based on pixel polarisation camera, and the method comprising the steps of
As follows:
Step (1), building optical rotation optical path figure, light source selects single longitudinal mode laser light source or low-pressure sodium lamp, and light source is sent out
Go out single wavelength light, to determine the specific rotatory power under this wavelength conditionOptical rotatory substance selection standard polarization tube, and select
The high permeability polarizer, measures after light source luminescent is stable；
The single-wavelength light that step (2), light source produce becomes line polarized light through the polarizer, and line polarized light is through being not added with optically active substance
The polarization tube of matter is irradiated on pixel polarisation camera, often shoots a frame and i.e. records intensity signal and the polarization letter of now line polarized light
Breath, computer processes i.e. available now through being not added with the angle of the line polarized light vibration plane of optical rotatory substance through data
Step (3), adding optical rotatory substance to be measured in polarization tube, identical wavelength light is polarized through the polarizer, and transmission is added
The optical information of optical rotatory substance, by pixel polarisation camera real time record, extracts and solves the difference side of polarization thoroughly in same super-pixel unit
To photosensitive unit intensity signal, obtain the angle of now line polarized light vibration plane
Step (4), measurement optical rotatory substance temperature t；
Step (5), optically-active angle value areWhereinFor calibration value, can be considered fixing in one-shot measurement
Value,Resolve for captured in real-time picture and be worth, therefore optical rotationValue can with shooting same frame picture obtain simultaneously,
By formulaInput the specific rotatory power of now optically-active solutionAnd polarization tube length L, solution can be obtained in real time dense
Degree C；In like manner, input solution concentration C and polarization tube length L, available optically-active solution specific rotatory power
Wherein, in step (5), when measuring optically-active solution concentration C of change, change standard polarization tube into band external interface
Quartz ampoule, a width of L of quartz ampoule tube wall, polarized light is propagated along quartz ampoule width, and the interior solution temperature t of detection pipe in real time.
Wherein, the method can survey the optical rotation of optical rotatory substance, specific rotatory power and optically-active solution concentration.
The principle of the present invention is:
As it is shown on figure 3, a branch of line polarized light P incides the photosensitive target surface imaging of pixel polarisation camera, due to super-pixel unit
In the saturating polarization direction of each photosensitive unit light different, the pixel gray value that 2,3,4,5 photosensitive units are corresponding also differs.With
It is forward clockwise, 2,3,4,5 pixels the most corresponding 0 °, 45 °, 90 °, 135 ° of saturating polarization directions.If polarized light P vibration plane with
0 ° of photosensitive unit light saturating polarization direction angle is θ, then corresponding pixel gray value is45°、
90 °, 135 ° of corresponding pixel points gray values are respectively Thus four corresponding gray values can resolve and obtain polarized light vibration plane relative to 0 ° of photosensitive list
The angle of unitPixel polarisation camera super-pixel unit may be used without two kinds of (or multiple) polarization unit battle arrays
Row and related algorithm.
Present invention optical rotation method for real-time measurement based on pixel polarisation camera and measurement apparatus, its advantage has: (1) is relative
In based on rotating wave plate polarized light detection method, manufactured goods need not rotate analyzer, saves analyzing link, can measure rotation in real time
Stimulative substance optical rotation, improves and measures efficiency；(2) relative to tradition polariscope, the present invention detects based on digital information, it is to avoid people
For error, improve accuracy of detection；(3) the method can be used for the real-time measurement of optically-active solution of varied concentration.
Accompanying drawing explanation
Fig. 1 is traditional polariscope global facility of mentioning of Hu Zaiguo et al. and index path, wherein, 11 is light source, 12 is
Partially device, 13 be wave plate, 14 be polarization tube, 15 be analyzer；L represents that polarization tube length, P represent that line polarized light, q represent polarized light
The anglec of rotation；
Fig. 2 is three share vision field schematic diagram, and wherein, A represents that air, Q represent quartz；A. represent and regard more than (or being less than) zero degree
, b. represents zero degree visual field, and c. represents less than (or being more than) zero degree visual field；
Fig. 3 is based on pixel polarisation camera calibration light polarization information principle figure；
Fig. 4 is that wherein, 11 is light source, and 12 is the polarizer based on pixel polarisation camera optical rotation real-time measurement apparatus figure, 14
For polarization tube, 16 is pixel polarisation camera；
Fig. 5 is for measure polarized light polarization angle figure in real time based on pixel polarisation camera.
Detailed description of the invention
Below in conjunction with being embodied as example, the present invention is described further on micro-polaroid array preparing, but is not intended to
The present invention.
Embodiment 1: measure the angle of polarization of polarized light vibration plane based on pixel polarisation camera in real time.
As shown in Figure 4, the real-time measurement apparatus of a kind of optical rotation based on pixel polarisation camera, including light source 11, it is polarized
Device 12, polarization tube 14 and pixel polarisation camera 16, light source 11 provides single-wavelength light to illuminate, the unicast that light source is sent by the polarizer 12
Long light is filtered into line polarized light, and polarization tube 14 is for holding optical rotatory substance container, and pixel polarisation camera 16 receives, records final polarization
Optical information；Light source center 11 with in the polarizer 12 optical mirror plane axle center, polarization tube 14 axle center, the photosensitive target surface of pixel polarisation camera 16
The heart is on same straight line, and side is parallel, it is ensured that light path is unobstructed.
The idiographic flow of the angle of polarization measuring polarized light vibration plane based on pixel polarisation camera in real time of the embodiment of the present invention 1
As follows:
Step 1, light sodium lamp (light path such as Fig. 4-light source) and treat the 4min flashless phenomenon of sodium lamp working stability, by electronic
After rotatory polarization sheet (position such as Fig. 4-polarizer) is placed on sodium lamp, after polaroid, place polarization tube.By pixel polarisation phase
Machine powers on, connects computer, after being placed on polarization tube.Polarization tube places pure water, carries out collection and prepares.In the diagram, pixel polarisation phase
The metal nano grating of a corresponding light polarization direction, metal nano raster unit size and CCD on each photosensitive unit of machine
Photosensitive target surface size is identical.
Step 2, closedown indoor light, shield ambient light.Guarantee that the optical noise in addition to sodium lamp minimizes；
Step 3, rotary electric polaroid, be acquired when rotating speed is uniform, and now the vibration plane of polarized light follows polarization
Sheet does uniform rotation.Pixel polarisation camera uses good permanent OK-AM1160 black and white camera integrated with metal nano grating, gathers frame frequency
It is 20 width/s；Continuous acquisition 240 sub-picture.
Step 4, data synchronization transmissions computer end, optical rotation is entered by optical rotation real-time automatic measuring software based on pictorial information
Row extract real-time；A. piece image is split as 0 °, 45 °, 90 °, 135 ° of 4 polarization direction pictures.B. with reference to Fig. 3 mentions calculation
Polarized light vibration plane angle is calculated by method.
Step 5, software show polarized light vibration plane angle in real time, as shown in Figure 5.In Figure 5, software shows that line is inclined in real time
The light vibration face of shaking angle；Abscissa is shooting figure frame number, and vertical coordinate is line polarized light vibration plane and 0 ° of pixel polarisation camera polarization
Angle between unit.
The techniques well known related in the present invention does not elaborates.
Claims (8)
1. an optical rotation real-time measurement apparatus based on pixel polarisation camera, it is characterised in that: include light source (11), the polarizer
(12), polarization tube (14) and pixel polarisation camera (16), light source (11) provides single-wavelength light illumination, and the polarizer (12) is by light source
(11) single-wavelength light sent is filtered into line polarized light, polarization tube (14) for holding optical rotatory substance container, pixel polarisation camera
(16) receive, record final polarized light information；Light source (11) center and the polarizer (12) optical mirror plane axle center, polarization tube (14) axle
The heart, pixel polarisation camera (16) photosensitive target surface center are on same straight line, and side is parallel, it is ensured that light path is unimpeded.
A kind of optical rotation real-time measurement apparatus based on pixel polarisation camera the most according to claim 1, it is characterised in that:
Light source (11) is single longitudinal mode laser light source or low-pressure sodium lamp.
A kind of optical rotation real-time measurement apparatus based on pixel polarisation camera the most according to claim 1, it is characterised in that:
The polarizer (12) is high-performance standard linear polarizer.
A kind of optical rotation real-time measurement apparatus based on pixel polarisation camera the most according to claim 1, it is characterised in that:
Polarization tube (14) is standard polarization tube.
A kind of optical rotation real-time measurement apparatus based on pixel polarisation camera the most according to claim 1, it is characterised in that:
Pixel polarisation camera (16) is the camera apparatus that can receive and process polarized light polarization information.
6. an optical rotation method for real-time measurement based on pixel polarisation camera, it is characterised in that: it is as follows that the method comprising the steps of:
Step (1), building optical rotation optical path figure, light source selects single longitudinal mode laser light source or low-pressure sodium lamp, and light source sends list
One wavelength light, to determine the specific rotatory power under this wavelength conditionOptical rotatory substance selection standard polarization tube, and select high saturating
Cross the rate polarizer, measure after light source luminescent is stable；
The single-wavelength light that step (2), light source produce becomes line polarized light through the polarizer, and line polarized light is through being not added with optical rotatory substance
Polarization tube is irradiated on pixel polarisation camera, often shoots a frame and i.e. records intensity signal and the polarization information of now line polarized light,
Computer processes i.e. available now through being not added with the angle of the line polarized light vibration plane of optical rotatory substance through data
Step (3), adding optical rotatory substance to be measured in polarization tube, identical wavelength light is polarized through the polarizer, and optically-active is added in transmission
The optical information of material, by pixel polarisation camera real time record, extracts the different polarization direction senses thoroughly solving in same super-pixel unit
Light unit intensity signal, obtains the angle of now line polarized light vibration plane
Step (4), measurement optical rotatory substance temperature t；
Step (5), optically-active angle value areWhereinFor calibration value, one-shot measurement can be considered fixed value,Resolve for captured in real-time picture and be worth, therefore optical rotationValue can with shooting same frame picture obtain, by public affairs simultaneously
FormulaInput the specific rotatory power of now optically-active solutionAnd polarization tube length L, solution concentration C can be obtained in real time；With
Reason, input solution concentration C and polarization tube length L, available optically-active solution specific rotatory power
A kind of optical rotation method for real-time measurement based on pixel polarisation camera the most according to claim 6, it is characterised in that:
In step (5), when measuring optically-active solution concentration C of change into, standard polarization tube is changed the quartz ampoule of band external interface, quartz ampoule
The a width of L of tube wall, polarized light is propagated along quartz ampoule width, and the interior solution temperature t of detection pipe in real time.
A kind of optical rotation method for real-time measurement based on pixel polarisation camera the most according to claim 6, it is characterised in that:
The method can survey the optical rotation of optical rotatory substance, specific rotatory power and optically-active solution concentration.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109520935A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The optical activity measurement method realized based on convergent neuron |
| CN110132853A (en) * | 2019-04-11 | 2019-08-16 | 中国科学技术大学 | Rotatory dispersive measuring system and method based on pixel polarization camera |
| CN110132420A (en) * | 2018-02-09 | 2019-08-16 | 上海微电子装备（集团）股份有限公司 | Polarimeter, polarization measurement method and light alignment method |
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