CN108132230A - A kind of device and method of liquid refractivity automatic measurement - Google Patents
A kind of device and method of liquid refractivity automatic measurement Download PDFInfo
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- CN108132230A CN108132230A CN201810178487.0A CN201810178487A CN108132230A CN 108132230 A CN108132230 A CN 108132230A CN 201810178487 A CN201810178487 A CN 201810178487A CN 108132230 A CN108132230 A CN 108132230A
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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
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
Abstract
A kind of device and method of liquid refractivity automatic measurement, belong to technical field of electro-optical measurement, in order to solve that the cumbersome of the prior art, relative accuracy are relatively low, equipment volume is larger and synthtic price index, the device such as measurement range relative narrower include laser light source, laser beam expander, cuvette, automatic draw-out device, camera, driving motor, double slit plate, computer and single seam plate composition；Laser light source sends out single beam laser, and laser projects singly sewing on for single seam plate after laser beam expander is expanded, and Fraunhofer diffraction occurs, light projects after diffraction occurs Young's double-slot interference on the double slit of double slit plate, the interference fringe obtained on camera；Cuvette is installed below in upper single seam of double slit plate, cuvette is connected with automatic draw-out device, for being in the testing liquid after dress extracts；Automatic draw-out device, camera and driving motor are connect respectively with computer, and camera is connected with driving motor；The present invention is easy to operate, precision is high, automatic measurement can be achieved.
Description
Technical field
The invention belongs to technical field of electro-optical measurement, have device and the side for being related to a kind of liquid refractivity automatic measurement
Method.
Background technology
Instrument for determining index of refraction of liquid is a kind of device that the optical quantities measured are converted to digital quantity.It is a kind of convenient
The device of liquid refractivity is measured, is widely used in the fields such as chemical industry, food, medicine, environmental protection, scientific research.
Refractive index can reflect a variety of spies of substance to a certain extent as an important parameter for weighing liquid property
Property, and will use parameter associated therewith in many research fields and sphere of life.In scientific research field, the measurement of refractive index
The problem of being all one cumbersome all the time, does not need to the high fluid sample of great amount of cost sometimes for must not measure.It is drinking
Food field, illegal retailer for one's own profit, do not stint and produce toxic or low price cost commodity, to improve the receipts of oneself
Enter.Cider has abundant nutritive value, and the thing followed is exactly the fraud problem of cider, can be led in this case
Cross the refractive index for measuring cider and then the quality problem for reflecting cider.Equally, the problem of white wine is faked can also use this
Kind of mode solves.Its true and false is judged by refractive index.The suchlike detection for also having the ethanol content in ethanol petrol,
Adding a small amount of ethyl alcohol in the oil is possible, because ethyl alcohol completely burned can be generated does not have air any dirt to space
The carbon dioxide and water of dye, but if being doped with a large amount of ethyl alcohol, the service life of automobile will be shortened.By measuring ethyl alcohol
The numerical value of the refractive index of gasoline, it can be determined that the content of ethyl alcohol.
The method that existing liquid refractivity tester measuring method uses has hydrometer method, polarimetry, spectrometer method, ultrasound
Wave method and index method etc., hydrometer method precision is higher but cumbersome, and assay balance need to be used for multiple times；Polarimetry is detection polarization
The changing rule of light light intensity needs heterogeneity not high with different optical activities and relative accuracy；Spectrometer method is detection liquid
Body light transmittance, precision be not relatively high；Supercritical ultrasonics technology has the characteristics that with high accuracy, but equipment volume is not larger portable；Refractive index
The Abbe refractometer based on total reflection is typically in method, measurement accuracy is higher, but measurement range relative narrower.
Invention content
The cumbersome of the prior art, relative accuracy are relatively low, equipment volume is larger and measurement range in order to solve by the present invention
The synthtic price index such as relative narrower provide a kind of new equipment and method for measuring liquid refracting.It is capable of impact of refractive index measurement
Process carries out automatic measurement, dramatically avoids human error present in measurement process, while also enhances calculating knot
The accuracy of fruit improves the practicability and accuracy of instrument for determining index of refraction of liquid, and measurement process is made to become simpler, smart
It is accurate, efficient.
The present invention is to solve the above problems, the technical solution used is as follows：
A kind of liquid refractivity self-operated measuring unit, is characterized in, including laser light source, laser beam expander, cuvette, from
Dynamic draw-out device, camera, driving motor, double slit plate, computer and single seam plate composition；Laser light source sends out single beam laser, laser
Singly sewing on for single seam plate is projected after laser beam expander is expanded, Fraunhofer diffraction occurs, light projects after diffraction
Young's double-slot interference occurs on the double slit of double slit plate, the interference fringe obtained on camera；Pacify below in upper single seam of double slit plate
Equipped with cuvette, cuvette is connected with automatic draw-out device, for being in the testing liquid after dress extracts；Automatic draw-out device,
Camera and driving motor are connect respectively with computer, and camera is connected with driving motor.
The automatic draw-out device is successively by container, small-size centrifugal pump, flowmeter, electrically operated valve, control system, centrifugal pump
Motor and valve driving machine composition；The electrically operated valve is connected with cuvette；Control system is connect with computer；Control system is led to
Control centrifugal pump motor and valve driving machine are crossed to control the beginning and termination extracted automatically, when control system assigns extraction instruction
When, centrifugal pump motor and valve driving machine operating simultaneously make small-size centrifugal pump operating extract liquid, electrically operated valve unlatching respectively；It is small-sized
The liquid that centrifugal pump extracts feeds back to control system by flowmeter counting, and control system is controlled when flow number reaches 5ml
Centrifugal pump motor and valve driving machine are simultaneously stopped operating, small-size centrifugal pump operating are made to extract liquid respectively, electrically operated valve is closed, pumping
Take end.
A kind of liquid refractivity method for automatic measurement, it is characterized in that, this method includes the following steps：
Step 1: zeroing is handled：
When not adding testing liquid in cuvette, the stripe pattern received on camera is transmitted to computer, and computer judges
Whether the main striped in center is located at the horizontal center line of camera, if the main striped in center is located at the upper half CCD receivers of camera, counts
The control driving motor rotating forward of calculation machine moves up camera；If the main striped in center is located at the lower half CCD receivers of camera, calculate
Machine control driving motor reversion moves down camera；Until the main striped in center is located at the horizontal centre of the CCD receivers of camera
At line, and striped is symmetrical above and below, and symmetrical striped at this time is located at equilbrium position, and striped at this time is known as initial state striped；
Step 2: automatic draw-out device extracts testing liquid into cuvette；
Step 3: repeating step 1, the interference fringe on the CCD receivers of camera is made to turn again to equilbrium position, at this time
It is known as final states striped in the CCD of camera stripeds received on the receiver, the last position of camera is remembered relative to the distance of initial position
For Δ L；
Step 4: the refractive index of testing liquid is calculated in computer；
It is as follows with the relevant calculation formula of Δ L：Slit S on double slit plate1After adding cuvette afterwards, then carry out Young pair
During seam experiment, the bright line of zero level just will be shifted up point P, and interference fringe whole simultaneously can up translate；So move past striped
Number be：
Δ m=(n-n0)a/λ
And the distance of move of stripe then can by Δ L=Δ me, andIt is calculated；
To sum up,
Wherein：Δ L is last position and the range difference of the initial position after zeroing；
Δ m is the number for moving past striped；
Refractive index of the n for testing liquid, n0Refractive index for air；
A is cuvette thickness, and λ is the wavelength of laser；
Fringe spacings of the e between two neighboring two striped or dark fringe, D are the distance between double slit plate to CCD receivers,
D is the distance between two double slits on double slit plate, and D ＞ ＞ d.
Beneficial effects of the present invention：
(1) present invention considered the existing prior art during current measuring refractive indexes of liquid it is cumbersome,
Relative accuracy is relatively low, equipment volume is larger and the synthtic price index such as measurement range relative narrower, establishes by computer-controlled operation
Measuring refractive indexes of liquid process, avoid existing artificial when waste, the fringe location of liquid charging stock during manual operation
It is that may be present in error and processing data result to calculate the problems such as wrong and time-consuming.
(2) present invention is received using camera, and image information is converted to digital information feeds back to computer, by
Computer controls the movement of driving motor to realize the movement of camera, forms a stable reponse system.
(3) material used in cuvette is inert material in the present invention, is not chemically reacted with testing liquid, is retained
Original property of liquid, non-cpntact measurement is realized using optical interference circuit.
The arrangement achieves the full-automations of measuring refractive indexes of liquid, and being reduced to a great extent in measurement process may deposit
Human error.Refractive index value after measuring directly obtains by computer, avoids artificially calculate time-consuming while also improves
The accuracy of measurement result.
This product have measuring cell is few, required liquid capacity is small, easy to operate, precision is high, can be achieved automatic measurement, and
The advantages that product is easy to carry is also applied for the measurement of thin solid refractive index.
Description of the drawings
Fig. 1：A kind of liquid refractivity self-operated measuring unit structure diagram of the present invention.
Fig. 2：Automatic draw-out device flow chart.
Fig. 3：Driving motor controls camera shifting principle figure.
Fig. 4：Interference fringe under equilbrium position.
Fig. 5：Optical path schematic diagram.
Wherein, 1. laser light sources, 2. laser beam expanders, 3. cuvettes, 4. automatic draw-out devices, 5. cameras, 6. driving electricity
Machine, 7. double slit plates, 8. computers, 9. single seam plates.
Specific embodiment
The present invention is described in further details below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of liquid refractivity self-operated measuring unit, including laser light source 1, laser beam expander 2, colorimetric
Ware 3, automatic draw-out device 4, camera 5, driving motor 6, double slit plate 7, computer 8 and single seam plate 9 form, camera 5 and driving electricity
Machine 6 is connected.Laser light source 1 sends out single beam laser, and laser projects single seam of single seam plate 9 after laser beam expander 2 is expanded
On, Fraunhofer diffraction occurs, light projects after diffraction occurs Young's double-slot interference on the double slit of double slit plate 7.
Cuvette 3 is installed below in upper single seam of double slit plate 7, cuvette 3 is connected with automatic draw-out device 4, is used for
Testing liquid after being extracted in dress.Automatic 4 camera 5 of draw-out device and driving motor 6 are connect respectively with computer 8.
If Fig. 2 shows, automatic draw-out device 4 is successively by being in the container 4-1 of dress prepare liquid before extracting, small-size centrifugal pump 4-2, flowing
Gauge 4-3, electrically operated valve 4-4, control system 4-5, centrifugal pump motor 4-6 and valve driving machine 4-7 compositions, wherein, electrically operated valve
4-4 is connected with cuvette 3.Control system 4-5 controls automatic pumping by controlling centrifugal pump motor 4-6 and valve driving machine 4-7
The beginning and termination taken, when control system 4-5 assigns extraction instruction, centrifugal pump motor 4-6 and valve driving machine 4-7 are operated simultaneously
Small-size centrifugal pump 4-2 operatings is made to extract liquid, electrically operated valve 4-4 unlatchings respectively；The liquid that small-size centrifugal pump 4-2 is extracted passes through
Flowmeter 4-3 countings feed back to control system 4-5, the control system 4-5 control centrifugal pump motors 4-6 when flow number reaches 5ml
Be simultaneously stopped operating with valve driving machine 4-7 makes small-size centrifugal pump 4-2 operatings extract liquid, electrically operated valve 4-4 closings respectively, extracts
Terminate.Control system 4-5 is connect with computer 8.
Camera 5 is made of camera lens 5-1 and CCD receiver 5-2.
If Fig. 3 shows, the stripe pattern that camera 5 receives is transmitted to computer 8, and whether computer 8 judges the main striped in center
At the horizontal center line of the CCD receivers 5-2 of camera 5, if the main striped in center is located at upper half CCD receiver 5-2, calculate
Machine 8 controls the rotating forward of driving motor 6 to move up camera 5；If the main striped in center is located at lower half CCD receiver 5-2, computer
The control reversion of driving motor 6 moves down camera 5.The last position of camera 5 is Δ L relative to the distance of initial position.
A kind of liquid refractivity method for automatic measurement, includes the following steps：
Step 1: zeroing is handled, detailed process is：
When not adding testing liquid in cuvette 3, the stripe pattern received on camera 5 is transmitted to computer 8, computer 8
Judge whether the main striped in center is located at the horizontal center line of camera 5, if the upper half CCD that the main striped in center is located at camera 5 is received
Device 5-2, then computer 8, which controls driving motor 6 to rotate forward, moves up camera 5；If the main striped in center is located at the lower half of camera 5
CCD receiver 5-2, then computer control driving motor 6 reversion move down camera 5.Until the main striped in center connects positioned at CCD
At the horizontal center line for receiving device 5-2, and striped is symmetrical above and below, as shown in figure 4, title striped at this time is located at equilbrium position, at this time
Striped be known as initial state striped.
Step 2: automatic draw-out device 4 extracts testing liquid into cuvette 3；
Step 3: repeating step 1, the interference fringe on CCD receivers 5-2 is made to turn again to equilbrium position, is existed at this time
The striped obtained on CCD receivers 5-2 is known as final states striped, and the last position of camera 5 is denoted as Δ relative to the distance of initial position
L；
Step 4: the refractive index of testing liquid is calculated according to the program and formula that edit for computer 8.With Δ L phases
The calculation formula of pass is as follows：If Fig. 5 shows, in slit S1Afterwards plus after cuvette 3, then when carrying out Young's double slit experiment, zero level is bright
Line just will be shifted up point P, and interference fringe whole simultaneously can up translate.The number for so moving past striped is：
Δ m=(n-n0)a/λ
And the distance of move of stripe then can by Δ L=Δ me, andIt is calculated.
To sum up,
Note：Δ L is last position and the range difference of the initial position after zeroing；
Δ m is the number for moving past striped；
Refractive index of the n for testing liquid, n0Refractive index for air；
A is cuvette thickness, and λ is the wavelength of laser；
Fringe spacings of the e between two neighboring two striped or dark fringe, D are the distance between double slit plate to CCD receivers,
D is the distance between two double slits on double slit plate, and D ＞ ＞ d.
Claims (3)
1. a kind of liquid refractivity self-operated measuring unit, is characterized in, including laser light source (1), laser beam expander (2), colorimetric
Ware (3), automatic draw-out device (4), camera (5), driving motor (6), double slit plate (7), computer (8) and single seam plate (9) form；
Laser light source (1) sends out single beam laser, and laser projects singly sewing on for single seam plate (9) after laser beam expander (2) is expanded,
Fraunhofer diffraction occurs, light projects after diffraction occurs Young's double-slot interference on the double slit of double slit plate (7), in camera (5)
The interference fringe of upper acquisition；
Cuvette (3) is installed below in upper single seam of double slit plate (7), cuvette (3) is connected with automatic draw-out device (4),
For be in dress extract after testing liquid；
Automatic draw-out device (4), camera (5) and driving motor (6) are connect respectively with computer (8), camera (5) and driving motor
(6) it is connected.
A kind of 2. liquid refractivity self-operated measuring unit according to claim 1, which is characterized in that the automatic extraction dress
Put (4) successively by container (4-1), small-size centrifugal pump (4-2), flowmeter (4-3), electrically operated valve (4-4), control system (4-5),
Centrifugal pump motor (4-6) and valve driving machine (4-7) composition；
The electrically operated valve (4-4) is connected with cuvette (3)；Control system (4-5) is connect with computer (8)；
Control system (4-5) by control centrifugal pump motor (4-6) and valve driving machine (4-7) control the beginning extracted automatically with
It terminates, when control system (4-5) assigns extraction instruction, centrifugal pump motor (4-6) and valve driving machine (4-7) while operates difference
Small-size centrifugal pump (4-2) operating is made to extract liquid, electrically operated valve (4-4) unlatching；The liquid warp that small-size centrifugal pump (4-2) extracts
Overcurrent gauge (4-3) counting feeds back to control system (4-5), and control system (4-5) controls centrifugal pump when flow number reaches 5ml
Motor (4-6) and valve driving machine (4-7) are simultaneously stopped operating, and small-size centrifugal pump (4-2) operating is made to extract liquid, motor-driven valve respectively
Door (4-4) is closed, and extraction terminates.
3. based on a kind of liquid refractivity method for automatic measurement of liquid refractivity self-operated measuring unit described in claim 1,
It is characterized in that this method includes the following steps：
Step 1: zeroing is handled：
When not adding testing liquid in cuvette (3), the stripe pattern received on camera (5) is transmitted to computer (8), computer
(8) judge whether the main striped in center is located at the horizontal center line of camera (5), if the main striped in center is located at the upper half of camera (5)
CCD receivers, then computer (8) control driving motor (6), which rotates forward, moves up camera (5)；If the main striped in center is located at phase
The lower half CCD receivers of machine (5), then computer control driving motor (6), which inverts, moves down camera (5)；Until center master
Striped is located at the horizontal center line of the CCD receivers of camera (5), and striped is symmetrical above and below, and symmetrical striped at this time is positioned at flat
Weighing apparatus position, striped at this time are known as initial state striped；
Step 2: automatic draw-out device (4) extracts testing liquid into cuvette (3)；
Step 3: repeating step 1, the interference fringe on the CCD receivers of camera (5) is made to turn again to equilbrium position, is existed at this time
The CCD stripeds received on the receiver of camera (5) are known as final states striped, the last position of camera (5) relative to initial position away from
From being denoted as Δ L；
Step 4: the refractive index of testing liquid is calculated in computer (8)；
It is as follows with the relevant calculation formula of Δ L：Slit S on double slit plate (7)1After adding cuvette (3) afterwards, then carry out Young
During double slit experiment, the bright line of zero level just will be shifted up point P, and interference fringe whole simultaneously can up translate；So move past item
The number of line is：
Δ m=(n-n0)a/λ
And the distance of move of stripe then can by Δ L=Δ me, andIt is calculated；
To sum up,
Wherein：Δ L is last position and the range difference of the initial position after zeroing；
Δ m is the number for moving past striped；
Refractive index of the n for testing liquid, n0Refractive index for air；
A is cuvette thickness, and λ is the wavelength of laser；
Fringe spacings of the e between two neighboring two striped or dark fringe, D are the distance between double slit plate to CCD receivers, and d is
The distance between two double slits on double slit plate, and D ＞ ＞ d.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810178487.0A CN108132230A (en) | 2018-03-05 | 2018-03-05 | A kind of device and method of liquid refractivity automatic measurement |
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| CN201810178487.0A CN108132230A (en) | 2018-03-05 | 2018-03-05 | A kind of device and method of liquid refractivity automatic measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490251A (en) * | 2018-10-26 | 2019-03-19 | 上海大学 | Underwater refractive index self-calibrating method based on light field multilayer refraction model |
| CN110927111A (en) * | 2019-12-11 | 2020-03-27 | 四川大学 | Method for measuring liquid refractive index by using wedge |
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| CN110927111A (en) * | 2019-12-11 | 2020-03-27 | 四川大学 | Method for measuring liquid refractive index by using wedge |
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Application publication date: 20180608 |