CN104345038A - Salt solution concentration detection method based on brillouin scattering - Google Patents
Salt solution concentration detection method based on brillouin scattering Download PDFInfo
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- CN104345038A CN104345038A CN201410664174.8A CN201410664174A CN104345038A CN 104345038 A CN104345038 A CN 104345038A CN 201410664174 A CN201410664174 A CN 201410664174A CN 104345038 A CN104345038 A CN 104345038A
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Abstract
The invention discloses a salt solution concentration detection method based on brillouin scattering. The method comprises the following steps of starting a computer, and enabling a constant-temperature controller to adjust the temperature of salt solution in a cell of a constant-temperature water tank; opening a laser device to emit a laser beam, enabling the laser beam to sequentially pass through a half-wave plate, a polarization plate, a one-fourth wave plate, a concave lens and a convex lens, and radiate into the salt solution with standard concentration in the cell, exciting a backward brillouin scattering signal, and enabling the scattering signal to return back along the original light path; when the laser beam is radiated to the polarization plate again, reflecting by a reflecting prism, and enabling the computer to record and analyze the data; enabling the computer to process and analyze a first brillouin scattering signal generated by the salt solution with standard concentration, and establishing a brillouin scattering frequency shift database; comparing the frequency shift amount of a second brillouin scattering signal and the brillouin scattering frequency shift database of the salt solution with standard concentration, so as to obtain the concentration of the to-be-measured salt solution. The method has the advantages that the timeliness is high, the sensitivity is high, and the dynamic change of the concentration is monitored and recorded on line.
Description
Technical field
The present invention relates to the Brillouin scattering detection field in Non-Destructive Testing, particularly relate to based on the detection method of Brillouin scattering to concentration of salt solution.
Background technology
Current, detect the concentration of a certain salt solusion in laboratory or the most titrimetry that still adopts of other industrial sites, although the alternative manual titration's method of novel automatic potentiometric titration, it is not suitable for detection or on-line monitoring fast eventually.And eventually there is the limitation detected in saline solution kind to the detecting instrument of specific salts solution concentration in some that market exists.Chinese patent CN101458214A proposes a kind of method that Raman spectrum detects organic polymer, the method is the detection for organic polymer substrate concentration, detection concentration of salt solution is not analyzed, and the method that this use Raman spectrum detects is divided into two kinds, one belongs to immersion and detects, probe need be immersed in salt solusion by the method, can not accomplish contactless detection.Another kind belongs to non-invasive and detects, the method analysis be optical signal transmissive, this proposes certain requirement to choosing of inspection instrument, and application also exists inevitably limitation; Chinese patent CN101216422 proposes a kind of method of refractive index detection solution concentration of high measurement accuracy, although have higher accuracy of detection, but detecting instrument can not detect the solution that the solution in pipeline or other are kept at semi-closed state, has certain limitation.
The elastic sound waves field interactions caused by molecular thermalmotion in incident light wave field and medium and produce light scattering, this light scattering phenomenon is called Brillouin scattering.At present, what adopt the experiment of the Brillouin scattering overwhelming majority is single beam focusing system based on F-P etalon and ICCD (Intensified CCD is with the CCD camera of image intensifying function), this system adopts Nd:YAG laser instrument to inspire backscatter signals, then carry out light splitting by F-P etalon, last ICCD system log (SYSLOG) scattering spectrum signal is also carried out data processing and analyzes storing by computing machine.
Summary of the invention
The object of the invention is to find out and be a kind ofly widely used and there is the concentration of salt solution detection method of high-timeliness, realize in experimental study to concentration of salt solution quick, precisely detect, can realize again factory salt solusion produce in the on-line checkingi of concentration of salt solution and abnormal alarm, this has great importance to processes such as realizing relating to the production of associated salts solution, transport and recovery.
The present invention realizes above-mentioned purpose by the following technical solutions.Based on the concentration of salt solution detection method of Brillouin scattering, computing machine connects ICCD, YAG laser and radiator valve respectively, and radiator valve is connected with constant temperature water tank; Constant temperature water tank, built with the cuvette filling salt solusion, is disposed with F-P etalon and aspheric design between ICCD to reflecting prism; / 2nd wave plates, polaroid, quarter-wave plate, concavees lens and convex lens are disposed with between YAG laser to cuvette; The side of reflecting prism is provided with polaroid;
Detecting step is as follows:
1) computing machine is opened and by the temperature of salt solusion in cuvette in radiator valve regulating thermostatic water tank;
2) open laser instrument outgoing laser beam and inject the normal concentration salt solusion in cuvette successively through half-wave plate, polaroid, quarter-wave plate, concavees lens and convex lens, and exciting brillouin scattering signal, scattered signal returns by original optical path; When being again mapped to polaroid, be mapped to reflecting prism with high reflectivity, through the reflection of reflecting prism, successively after aspheric design, F-P etalon, ICCD, by computer recording and analysis data;
3) computing machine carries out Treatment Analysis to the first brillouin scattering signal that normal concentration salt solusion produces, and passes through the Brillouin frequency shifts database of the first brillouin scattering signal Criterion concentration;
4) change the salt solusion contained in cuvette in the constant temperature water tank of pick-up unit into salt solusion to be measured, and regulate the temperature of salt solusion to be measured by computing machine and radiator valve;
5) step 2 is repeated) and the second brillouin scattering signal frequency shift amount of salt solusion generation to be measured for gained and the Brillouin frequency shifts database of normal concentration salt solusion are compared, concentration of salt solution to be measured can be drawn.
During the described Brillouin frequency shifts Database of described normal concentration salt solusion, regulate and control the temperature of described normal concentration salt solusion with described constant temperature water tank, thus obtain the described Brillouin frequency shifts database of described at each temperature normal concentration salt solusion.
After sensing, the Brillouin frequency shifts database set up by the synthermal lower normal concentration salt solusion of comparison, can draw the concentration of salt solusion to be measured to second brillouin scattering signal of described salt solusion to be measured.
When analyzing brillouin scattering signal, frequency shift amount or live width amount by analyzing brillouin scattering signal detect the concentration of salt solusion to be measured.
In described pick-up unit, the F-P etalon of component can use prism spectrometer to replace.
Detected object is applicable to detect salt solusion or aqueous slkali.
Compared with prior art, its advantage is in the present invention: ageing strong, highly sensitive, realizes the quick detection to concentration of salt solution; Strengthen the controllability that concentration of salt solution monitors, the labour intensity decreasing workman.Can realize producing salt solusion and the process such as pipeline transportation on-line monitoring and record the dynamic change of concentration.
Accompanying drawing explanation
Fig. 1 is the structural representation of the concentration of salt solution pick-up unit that the present invention is based on Brillouin scattering.
Fig. 2 is the process flow diagram of the concentration of salt solution detection method that the present invention is based on Brillouin scattering.
Fig. 3 the present invention is based on Brillouin scattering for the graph of a relation of the detection method frequency displacement of sodium chloride concentration of salt solution and concentration.
Embodiment
Below in conjunction with the embodiment of accompanying drawing, the invention will be further described.See Fig. 1 and Fig. 2, based on the concentration of salt solution detection method of Brillouin scattering, computing machine 13 connects ICCD 12, YAG laser 1 and radiator valve 8 respectively, and radiator valve 8 is connected with constant temperature water tank 7; Constant temperature water tank 7 is disposed with F-P etalon 11 and aspheric design 10 built with between cuvette 14, ICCD 12 to the reflecting prism 9 filling salt solusion; / 2nd wave plates 2, polaroid 3, quarter-wave plate 4, concavees lens 5 and convex lens 6 are disposed with between YAG laser 1 to cuvette 14; The side of reflecting prism 9 is provided with polaroid 3;
Detecting step is as follows:
1) computing machine 13 is opened and by the temperature of salt solusion in cuvette 14 in radiator valve 8 regulating thermostatic water tank 7;
2) open laser instrument 1 outgoing laser beam and inject the normal concentration salt solusion 204 in cuvette 14 successively through half-wave plate 2, polaroid 3, quarter-wave plate 4, concavees lens 5 and convex lens 6, and exciting brillouin scattering signal, scattered signal returns by original optical path; When being again mapped to polaroid 3, be mapped to reflecting prism 9 with high reflectivity, through the reflection of reflecting prism 9, successively after aspheric design 10, F-P etalon 11, ICCD12, by computer recording and analysis data;
3) the first brillouin scattering signal 205 that computing machine 13 pairs of normal concentration salt solusions 204 produce carries out Treatment Analysis, and passes through the Brillouin frequency shifts database 206 of the first brillouin scattering signal 205 Criterion concentration;
4) change the salt solusion contained in cuvette in the constant temperature water tank 7 of pick-up unit 201 14 into salt solusion 202 to be measured, and regulate the temperature of salt solusion to be measured by computing machine 13 and radiator valve 8;
5) repeat step 2) and the Brillouin frequency shifts database 206 of the second brillouin scattering signal 203 frequency shift amount that salt solusion 202 to be measured for gained is produced and normal concentration salt solusion 204 compare, concentration of salt solution 207 to be measured can be drawn.
When the described Brillouin frequency shifts database 206 of described normal concentration salt solusion 204 is set up, regulate and control the temperature of described normal concentration salt solusion 204 with described constant temperature water tank 7, thus obtain the described Brillouin frequency shifts database 206 of described at each temperature normal concentration salt solusion 204.
After sensing, the described Brillouin frequency shifts database 206 set up by the synthermal lower described normal concentration salt solusion 204 of comparison, can draw the concentration of described salt solusion to be measured 202 to second brillouin scattering signal 203 of described salt solusion to be measured 202.
The data analysis of first and second brillouin scattering signal 203,205 described detects the concentration of salt solusion to be measured by the frequency shift amount or live width amount analyzing brillouin scattering signal.
In described pick-up unit 201, the F-P etalon 11 of component can use prism spectrometer to replace.
Detected object is applicable to detect salt solusion or aqueous slkali.
The circuit that Computer 13 of the present invention represents by a dotted line controls laser instrument 1, ICCD 12 and radiator valve 8; Laser instrument 1 outgoing beam also successively by half-wave plate 2, polaroid 3, quarter-wave plate 4 expanding and focusing in the salt solusion that is mapped to and is contained in and is connected with in the constant temperature water tank 7 of radiator valve 8 through lens combination (concavees lens 5, convex lens 6), inspires backward Brillouin scattering signal; Scattered signal returns by original optical path, when again through polaroid 3, reflection occurs and directive reflecting prism 9, injects aspheric design 10, F-P etalon 11, ICCD 12 to be recorded spectrum by computing machine and analyze successively through reflecting prism.
embodiment 1:as Fig. 2, the apparatus structure schematic diagram of brillouin scattering signal Database, it comprises, injection seeded formula laser instrument Nd:YAG laser instrument 1; / 2nd wave plates 2; Polaroid 3; Quarter-wave plate 4; Lens combination (concavees lens 5, convex lens 6); Thermostat (constant temperature water tank 7, radiator valve 8); Reflecting prism 9; Aspheric design 10; F-P etalon 11; ICCD 12; Computing machine 13.
The brillouin scattering signal of various salts concentration is at different temperatures detected, for sodium chloride solution by this device.Its step is as follows:
use the concentration of salt solution pick-up unit 201 based on Brillouin scattering, detectable concentration is the sodium chloride solution of 0%, 3%, 3.25%, 3.5%, 3.75% respectively, and regulates the change of temperature by thermostat (constant temperature water tank 7, radiator valve 8).
computing machine 13 obtains the brillouin scattering signal under different condition and carries out analyzing and processing.
obtained frequency shift parameters stores and sets up Brillouin frequency shifts database 206 by computing machine 13, and as shown in Figure 2, standard chlorination sodium solution is the frequency shift amount of Brillouin signal and the relation of temperature under different temperatures, variable concentrations.
use based on the concentration of salt solution pick-up unit 201 of Brillouin scattering, detect testing sample and also obtain scattered signal, by computing machine to signal carry out process also and Fig. 3 data do comparative analysis, thus draw concentration of salt solution.
embodiment 2:the said salt solusion of the present invention is for sodium chloride solution.Concrete operations are as follows:
the foundation in concentration of sodium chloride solution frequency-shift data storehouse:
The light that laser instrument 1 penetrates is the vertical polarized light of 532nm, vertical polarized light becomes elliptically polarized light after half-wave plate 2, polaroid 3 and quarter-wave plate 4, elliptically polarized light to focus in the sodium chloride solution of concentration known via lens combination (concavees lens 5, convex lens 6) and produces scattered signal, and the temperature of solution changes gradually by the thermostat (constant temperature water tank 7, radiator valve 8) in tank.The backscatter signal produced turns back to quarter-wave plate 4 through lens combination (concavees lens 5, convex lens 6) again, and after transmitting twice this wave plate, polarisation of light state changes vertical polarization into by horizontal polarization.And this polaroid 3 is extremely low to vertical polarized light transmission rate, flashlight is through reflection directive aspheric design 10, again by F-P etalon 11 light splitting, ICCD12 spectra re-recorded, finally store the Brillouin shift of analysis scattered signal by computing machine 13 and set up Brillouin frequency shifts database 206.
the detection of concentration of sodium chloride solution to be measured:
After each optical element of laser light, directly get in sodium chloride solution to be measured.The scattered signal that the sodium chloride solution to be measured that computing machine 13 process obtains produces also compares with the Brillouin frequency shifts database 206 set up, and draws concentration of sodium chloride solution 207 to be measured.
Fig. 3 is the frequency shift amount of the brillouin scattering signal that variable concentrations sodium chloride solution excites and the graph of a relation of temperature.At the same temperature known by the relation in figure, the frequency shift amount of the brillouin scattering signal that the sodium chloride solution of variable concentrations excites is different.Therefore, the concentration of sodium chloride solution can be located by the Brillouin frequency shifts amount excited sodium chloride solution at certain temperature.
Claims (6)
1. based on the concentration of salt solution detection method of Brillouin scattering, it is characterized in that, computing machine connects ICCD, YAG laser and radiator valve respectively, and radiator valve is connected with constant temperature water tank; Constant temperature water tank, built with the cuvette filling salt solusion, is disposed with F-P etalon and aspheric design between ICCD to reflecting prism; / 2nd wave plates, polaroid, quarter-wave plate, concavees lens and convex lens are disposed with between YAG laser to cuvette; The side of reflecting prism is provided with polaroid;
Detecting step is as follows:
Open computing machine and by the temperature of salt solusion in cuvette in radiator valve regulating thermostatic water tank;
Open laser instrument outgoing laser beam and inject the normal concentration salt solusion in cuvette successively through half-wave plate, polaroid, quarter-wave plate, concavees lens and convex lens, and exciting brillouin scattering signal, scattered signal returns by original optical path; When being again mapped to polaroid, be mapped to reflecting prism with high reflectivity, through the reflection of reflecting prism, successively after aspheric design, F-P etalon, ICCD, by computer recording and analysis data;
Computing machine carries out Treatment Analysis to the first brillouin scattering signal that normal concentration salt solusion produces, and passes through the Brillouin frequency shifts database of the first brillouin scattering signal Criterion concentration;
Change the salt solusion contained in cuvette in the constant temperature water tank of pick-up unit into salt solusion to be measured, and regulate the temperature of salt solusion to be measured by computing machine and radiator valve;
Repeat step 2) and the second brillouin scattering signal frequency shift amount of salt solusion generation to be measured for gained and the Brillouin frequency shifts database of normal concentration salt solusion are compared, concentration of salt solution to be measured can be drawn.
2. as claimed in claim 1 based on the concentration of salt solution detection method of Brillouin scattering, it is characterized in that, during the described Brillouin frequency shifts Database of described normal concentration salt solusion, regulate and control the temperature of described normal concentration salt solusion with described constant temperature water tank, thus obtain the described Brillouin frequency shifts database of described at each temperature normal concentration salt solusion.
3. as claimed in claim 1 based on the concentration of salt solution detection method of Brillouin scattering, it is characterized in that, second brillouin scattering signal of described salt solusion to be measured after sensing, by the Brillouin frequency shifts database that the synthermal lower normal concentration salt solusion of comparison is set up, the concentration of salt solusion to be measured can be drawn.
4. as claimed in claim 1 based on the concentration of salt solution detection method of Brillouin scattering, it is characterized in that, when analyzing brillouin scattering signal, frequency shift amount or live width amount by analyzing brillouin scattering signal detect the concentration of salt solusion to be measured.
5., as claimed in claim 1 based on the concentration of salt solution detection method of Brillouin scattering, it is characterized in that, in described pick-up unit, the F-P etalon of component can use prism spectrometer to replace.
6. as claimed in claim 1 based on the concentration of salt solution detection method of Brillouin scattering, it is characterized in that, detected object is applicable to detect salt solusion or aqueous slkali.
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Cited By (3)
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| CN104977275A (en) * | 2015-07-15 | 2015-10-14 | 南昌航空大学 | OCT imaging device in SBS ultrasonic field excitation and imaging method of OCT imaging device |
| CN106596472A (en) * | 2016-11-23 | 2017-04-26 | 南昌航空大学 | Method and device for distinguishing whether honey is adulterated or not on basis of bulk viscosity characteristics |
| CN107907507A (en) * | 2017-09-28 | 2018-04-13 | 南昌航空大学 | A kind of lubricating oil elasticity modulus detection method based on Brillouin scattering spectrum |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104977275A (en) * | 2015-07-15 | 2015-10-14 | 南昌航空大学 | OCT imaging device in SBS ultrasonic field excitation and imaging method of OCT imaging device |
| CN104977275B (en) * | 2015-07-15 | 2017-07-21 | 南昌航空大学 | A kind of OCT image device and method under the ultrasonic field excitation of SBS |
| CN106596472A (en) * | 2016-11-23 | 2017-04-26 | 南昌航空大学 | Method and device for distinguishing whether honey is adulterated or not on basis of bulk viscosity characteristics |
| CN107907507A (en) * | 2017-09-28 | 2018-04-13 | 南昌航空大学 | A kind of lubricating oil elasticity modulus detection method based on Brillouin scattering spectrum |
| CN107907507B (en) * | 2017-09-28 | 2019-11-15 | 南昌航空大学 | A kind of lubricating oil elasticity modulus detection method based on Brillouin scattering spectrum |
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