CN102841057A - Simple optical rotation measuring device - Google Patents
Simple optical rotation measuring device Download PDFInfo
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- CN102841057A CN102841057A CN2011101733218A CN201110173321A CN102841057A CN 102841057 A CN102841057 A CN 102841057A CN 2011101733218 A CN2011101733218 A CN 2011101733218A CN 201110173321 A CN201110173321 A CN 201110173321A CN 102841057 A CN102841057 A CN 102841057A
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- analyzer
- polarizer
- light intensity
- light
- light path
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Abstract
The invention relates to a simple optical rotation measuring device. An electronic light intensity receiver (4) and a laser (1) are adjusted to be at the same height, and the laser is adjusted to cause laser lights to be horizontally transmitted. A polarizer (2) is introduced into a light path, and a polarizer (4) is adjusted, thus numerical reading of the light intensity receiver is maximum. A polarizer (3) is introduced into the light path, a polarization analyzer (4) is adjusted to cause the numeric reading of the light intensity receiver to be maximum, and an angle numerical value q1 of the polarization analyzer (4) at the moment is recorded. A sampler (8) is introduced into the light path, a polarization analyzer (4) is adjusted to cause the numeric reading of the light intensity receiver to be maximum, an angle numerical value q2 of the polarization analyzer (4) at the moment is recorded, and the optical rotation is equal to q2-q1.
Description
Technical field
Apparatus of the present invention relate to material optically-active research field.
Background technology
Material can make the character of the plane of oscillation rotation of polarized light be called optical activity; Material with optical activity is called optical active substance; Make the plane of oscillation of polarized light be called d-isomer to the material of right rotation (CW); Material to anticlockwise (counterclockwise) is called levo form, and the angle that the polarized light plane of oscillation is rotated is called the optical activity of this material.The specific rotatory power (optical activity of unit length, unit concentration) of material is a physical constant of optical active substance under uniform temperature, certain wavelength.Through the mensuration of specific rotatory power, can identify material and judge the left and right body that revolves.
Experiment measurement mechanism commonly used comprises the polarizer and wave plate, analyzer, reading device and sample.Describe with Fig. 3, in Fig. 3, wave plate (32) is placed on the polarizer (31) at the back, makes vibration plane change to (34) from (33), observes three different part visual fields of light and shade (being called for short three fens visual fields) (36) at analyzer (35).Rotation analyzer (35) disappears the separatrix of three fens visual fields, is called zero degree market (37) this moment, record reading q1 at this moment.Put into sample, three fens visual fields (36) occur, the direction of regulating analyzer polaroid (35) makes turn of the market in three fens become zero degree visual field (37), the reading q2 of record this moment, optical activity q=q2-q1 then, q>0 be dextrorotatory substance, < 0 is levo-rotatory substance to q.
Be exactly that the vibration vector of the polarizer (31) and wave plate (32) is identical at shake the thoroughly component of direction (35) of analyzer zero point in fact, and this moment, three fens visual fields became the even visual field of brightness, and 2 zero degree visual fields are arranged in the scope of analyzer (35) Rotate 180 degree; Zero degree visual field is dim (37) relatively; One brighter (38) are because human eye is very insensitive to high light, when the visual field is in bright state; The analyzer rotating certain angle; Human eye is the variation of imperceptible field luminance at all, therefore just can not judge the state at zero point exactly, certainly will cause and measure the inaccurate of result.So, be with the darker zero degree visual field of brightness as the reference position of measuring.The general darker zero degree visual field (37) of brightness is called genuine zero degree, and the uniform zero degree visual field (38) of will becoming clear is called false zero degree.Because true zero degree (37) brightness is not high, it is more painstaking to observe, and changes even visual field in judgement into from three fens visual fields, and relatively difficulty causes the optical activity measurement inaccurate, and is obvious especially to low-angle.And, judging that there is subjectivity in three fens visual fields owing to be to observe through eyes.
Summary of the invention
In order to improve sensitivity, select laser and select analyzer thoroughly the shake direction identical with the polarizer; In order to reduce the influence of human eye, select the electronics light intensity meter.
Apparatus of the present invention technical scheme is to use laser to replace sodium light commonly used; It is linearly polarized light that laser approaches, and regulates the direction of shaking thoroughly of the polarizer and obtains a more intense light, rotation one week of analyzer; Write down the corresponding light intensity of each angle; Place sample and get into light path, rotate one week of analyzer once more, write down the corresponding light intensity of each angle.Sample before putting into largest light intensity (or minimum intensity of light) and put into after the difference of largest light intensity (or minimum intensity of light) institute corresponding angle be exactly optical activity.
Apparatus of the present invention beneficial effect is directly perceived, can be familiar with the character of polarized light better, can better understand optically-active and optical activity, in teaching, can improve students ' understanding, strengthen teaching efficiency.
Description of drawings
Fig. 1 is contrive equipment figure.
Fig. 2 is the polarizer (analyzer) device of band angle indication.
Common experimental provision of Fig. 3 and visual field synoptic diagram.
Wherein among Fig. 11, laser instrument, 2, the polarizer, 3, analyzer, 4, electronic light strong cohesiveness receiver, 5, power supply, 6, sample.
Among Fig. 2 21, vernier, 22, the master calibration dish, 23, polaroid (be fixed on the alidade, rotate) with alidade.
Among Fig. 3 31, the polarizer, 32, wave plate, 33, the polarizer direction of shaking thoroughly, 34, pass through the direction of vibration behind the wave plate again, 35, the analyzer direction of shaking thoroughly through the polarizer, 36, three fens visual fields, 37, true zero degree visual field, 38, false zero degree visual field.
Embodiment
The polarizer and analyzer are with a kind of device, near the polarizer that is called of light source, near the analyzer that is called of light intensity receptacle.
Open laser power supply, electronic light strong cohesiveness receiver (4) and laser instrument (1) are drawn close, regulate electronic light strong cohesiveness receiver (4) and height such as laser instrument (1) grade.Zoom out electronic light strong cohesiveness receiver (4), regulate the laser instrument above-below direction, laser level is propagated.
The polarizer (2) is introduced light path, and the direction of shaking thoroughly of the rotating vernier dish change polarizer (2) makes the maximum that is shown as of electronic light strong cohesiveness receiver.
Analyzer (3) is introduced light path, and the direction of shaking thoroughly of rotating vernier dish change analyzer (3) makes the maximum that is shown as of electronic light strong cohesiveness receiver, notes analyzer (3) the reading q1 of this moment.
Sample (8) is introduced light path, and the direction of shaking thoroughly of rotating vernier dish change analyzer (3) makes the maximum that is shown as of electronic light strong cohesiveness receiver, notes analyzer (3) the reading q2 of this moment.
Before and after comparative sample put into, analyzer (3) reading q2 and q1's was poor, and this is an optical activity, q2-q1>0 be d-isomer, < 0 is levo form to q2-q1.
Claims (2)
1. a simple and easy optical rotatory power measuring instrument is by laser instrument and power supply, the polarizer, analyzer, electronic light strong cohesiveness receiver, and it is characterized in that: electronic light strong cohesiveness receiver directly shows current light intensity; After the direction of shaking thoroughly, analyzer and the sample of the polarizer introducing light path adjusting polarizer introduced light path all is the direction of shaking thoroughly of regulating analyzer, makes the display digit of light intensity receptacle reach maximum.
2. according to right 1 said a kind of simple and easy optical rotatory power measuring instrument; It is characterized in that: regulate analyzer and make the display digit of light intensity signal receptacle reach maximum; The angle value of analyzer when recorded electronic light intensity receptacle numeral reaches maximum, optical activity are exactly before the sample introducing light path and the angle difference of back analyzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101733218A CN102841057A (en) | 2011-06-25 | 2011-06-25 | Simple optical rotation measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101733218A CN102841057A (en) | 2011-06-25 | 2011-06-25 | Simple optical rotation measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102841057A true CN102841057A (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101733218A Pending CN102841057A (en) | 2011-06-25 | 2011-06-25 | Simple optical rotation measuring device |
Country Status (1)
| Country | Link |
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| CN (1) | CN102841057A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040036854A1 (en) * | 2002-06-17 | 2004-02-26 | Citizen Watch Co., Ltd | Method of and apparatus for measuring concentration |
| CN101339125A (en) * | 2008-08-27 | 2009-01-07 | 汤哲夫 | Digital polarimeter |
-
2011
- 2011-06-25 CN CN2011101733218A patent/CN102841057A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040036854A1 (en) * | 2002-06-17 | 2004-02-26 | Citizen Watch Co., Ltd | Method of and apparatus for measuring concentration |
| CN101339125A (en) * | 2008-08-27 | 2009-01-07 | 汤哲夫 | Digital polarimeter |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121226 |