CN104634392A - Device and method for synchronously measuring concentration, thickness and temperature of liquid film - Google Patents
Device and method for synchronously measuring concentration, thickness and temperature of liquid film Download PDFInfo
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- CN104634392A CN104634392A CN201510072404.6A CN201510072404A CN104634392A CN 104634392 A CN104634392 A CN 104634392A CN 201510072404 A CN201510072404 A CN 201510072404A CN 104634392 A CN104634392 A CN 104634392A
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Abstract
The invention provides a device for synchronously measuring concentration, thickness and temperature of a liquid film. The device is characterized by comprising three laser light sources, a wavelength division multiplexer, a first collimator, a liquid film carrier, a second collimator, a wave separator, three spectrum collection parts and a computer, wherein the three laser light sources transmits laser beams of different wavelengths; the wavelength division multiplexer is connected with the three laser light sources, and the three laser beams are coupled into one beam; the first collimator is connected with the wavelength division multiplexer and used for focusing the laser beam; the liquid film carrier is arranged right below the first collimator; the second collimator is arranged right below the liquid film carrier and used for collecting laser beams penetrating through the liquid film carrier and focusing the laser beam; the wave separator is connected with the second collimator and separating the laser beam into three laser beams in different wavelengths; the three spectrum collection parts are respectively connected with the wave separator and used for receiving and measuring the intensity of each laser beam separated by the wave separator; the computer is respectively connected with the three spectrum collection parts and used for processing the intensity of the laser beams measured by the three spectrum collection parts and calculating the concentration, thickness and temperature value of the to-be-detected liquid film.
Description
Technical field
The present invention relates to measurement mechanism and measuring method, be specifically related to a kind of based on Beer-Lambert law, on-line synchronous measures measurement mechanism and the measuring method of liquid film concentration to be measured, thickness and temperature.
Background technology
In various industrial process, the phenomenon that drop strikes solid surface formation liquid film extensively exists, as vehicle vent gas discharging pipe formed urea liquid liquid film etc. in SCR (SCR) system.Carry out quantitative test to liquid film to understand the formation of liquid film better and evaporate the essence of this extremely complicated physical process, and the various industrial processs optimized involved by liquid film are had very important significance.
The constituent concentration of solution thickness of liquid film, temperature and liquid film inside is closely-related, and these parameters often intercouple in the research of liquid film, set up and solve bring difficulty to model.Traditional measuring method can only realize the measurement of single parameter in concentration, thickness and the temperature to liquid film, cannot measure this three important indicators simultaneously.
Summary of the invention
The present invention be directed to that the problems referred to above carry out, object is to provide a kind of can go out device and the measuring method of the concentration of solution liquid film, thickness and temperature by Simultaneously test.
The present invention for achieving the above object, have employed following technical scheme:
The invention provides the device of a kind of synchro measure liquid film concentration, thickness and temperature, it is characterized in that, comprising: three LASER Light Source, for sending the different laser beam of wavelength; Wavelength division multiplexer, is connected with three LASER Light Source, and the three beams of laser light beam coupling three LASER Light Source sent becomes a branch of; First collimator, is connected with wavelength division multiplexer, focuses on the laser beam of wavelength division multiplexer coupling; Carrier of liquid membrane, is arranged on immediately below first collimator, and for carrying liquid film to be measured, the laser beam sent after first collimator is focused on is through liquid film to be measured; Second collimating apparatus, is arranged on immediately below Carrier of liquid membrane, for collecting the laser beam through Carrier of liquid membrane, and focuses on this laser beam; Channel-splitting filter, is connected with the second collimating apparatus, and the laser beam sent after the second collimating apparatus being focused on is divided into the different three beams of laser light beam of wavelength; Three spectra collection components, are connected with channel-splitting filter respectively, receive and measure the intensity of often restrainting laser beam that this channel-splitting filter separates; And computing machine, be connected with three spectra collection components respectively, the intensity of the laser beam that three spectra collection components record is processed, calculate the concentration of liquid film to be measured, thickness and temperature value.
Further, the device of synchro measure liquid film concentration, thickness and temperature involved in the present invention, can also have such feature: wherein, LASER Light Source is semiconductor laser, and spectra collection component is photodetector.
The present invention also provides a kind of device of above-mentioned synchro measure liquid film concentration, thickness and temperature that adopts to measure the method for the concentration of liquid film, thickness and temperature, it is characterized in that, comprise the following steps: step one, adopt absorption spectrum measuring apparatus to measure the absorption spectrum of solution liquid film of some variable concentrations, different temperatures, obtain variable concentrations, different temperatures solution liquid film to the absorption coefficient of the light of different wave number; Step 2, compare variable concentrations, different temperatures solution liquid film to the absorption coefficient of the light of different wave number, select three wave number ν
1, ν
2and ν
3, make the solution liquid film of variable concentrations, different temperatures be ν to wave number
1and ν
2the absorption coefficient of light be zero to the rate of change of concentration, make the solution liquid film of variable concentrations, different temperatures be ν to wave number
3the absorption coefficient of light be zero to the rate of change of temperature; Step 3, respectively at two wave number ν
1and ν
2under, matching is done to the temperature of the absorption coefficient corresponding to the solution liquid film of variable concentrations, different temperatures and solution liquid film, obtains following equation: K
i=f (T), i=1 in formula, 2, K
ibe concentration be c, temperature be the solution liquid film of T is ν to wave number
ithe absorption coefficient of light, at wave number ν
3under, matching is done to the concentration of the absorption coefficient corresponding to the solution liquid film of variable concentrations, different temperatures and solution liquid film, obtains following equation: K
3=f (c), K in formula
3it is the absorption coefficient corresponding to solution liquid film that concentration is c, temperature is T; Step 4, arranges the Carrier of liquid membrane without liquid film, regulates three LASER Light Source, and making three LASER Light Source export wave number is respectively ν
1, ν
2and ν
3laser beam, adopt three spectra collection components to measure through being ν without wave number after the Carrier of liquid membrane of liquid film respectively
1, ν
2and ν
3the intensity of laser beam, light intensity I as a setting
0i(i=1,2,3); Step 5, load liquid film to be measured on Carrier of liquid membrane, after the Carrier of liquid membrane adopting three spectra collection components to measure through load liquid film to be measured respectively, wave number is ν
1, ν
2and ν
3the intensity of laser beam, as transmitted light intensity I
ti(i=1,2,3); Step 6, adopts computing machine to collect background light intensity I
0i(i=1,2,3) and transmitted light intensity I
ti(i=1,2,3), and carry out data processing, according to Beer-Lambert law, transmissivity is expressed as:
τ in formula
ibe transmissivity, d is the thickness of liquid film to be measured, and calculating liquid film to be measured to wave number is ν
1, ν
2and ν
3the logarithm ln τ of transmissivity of laser beam
i, (i=1,2,3), then:
lnτ
1＝-K
1d＝-f(T)d (1)，
lnτ
2＝-K
2d＝-f(T)d (2)，
lnτ
3＝-K
3d＝-f(c)d (3)，
Form by formula (1) and formula (2) temperature T and the thickness d that system of equations can solve liquid film to be measured, then the thickness d solved is brought in formula (3), the concentration c of liquid film to be measured can be tried to achieve.
The effect of invention and effect
According to device and the measuring method of synchro measure liquid film concentration, thickness and temperature involved in the present invention, because three LASER Light Source can send the different three beams of laser light beam of wavelength respectively, three spectra collection components measure the intensity of the three beams transmission laser light beam that channel-splitting filter sends respectively, and be transferred to computing machine, computing machine can obtain the concentration value of liquid film to be measured, one-tenth-value thickness 1/10 and temperature value through calculating, and therefore can go out the important parameter of the concentration of liquid film, thickness and temperature these three by Simultaneously test.In addition, because arranging of two collimating apparatuss can focus on laser beam, increase the intensity of the laser beam through liquid film, therefore can realize high-precision measurement.
Accompanying drawing explanation
Fig. 1 is the device of the synchro measure liquid film concentration of embodiment, thickness and temperature.
Embodiment
Below in conjunction with accompanying drawing, the device of synchro measure liquid film concentration, thickness and temperature involved in the present invention and measuring method are elaborated.
< embodiment one >
Fig. 1 is the device of the synchro measure liquid film concentration of embodiment, thickness and temperature.
As shown in Figure 1, the device 10 of synchro measure liquid film concentration, thickness and temperature comprises LASER Light Source 11, LASER Light Source 12, LASER Light Source 13, wavelength division multiplexer 14, first collimator 15, Carrier of liquid membrane 16, second collimating apparatus 17, channel-splitting filter 18, spectra collection component 19, spectra collection component 20, spectra collection component 21 and computing machine 22.
In the present embodiment, LASER Light Source 11,12 and 13 is all semiconductor laser.Wavelength division multiplexer 14 is connected with semiconductor laser 11, semiconductor laser 12 and semiconductor laser 13 respectively.First collimator 15 is connected with wavelength division multiplexer 14.Carrier of liquid membrane 16 is arranged on immediately below first collimator 15, and in the present embodiment, Carrier of liquid membrane 16 is quartz glasss.Second collimating apparatus 17 is arranged on immediately below Carrier of liquid membrane 16.Channel-splitting filter 18 is connected with the second collimating apparatus 17.Spectra collection component 19,20 and 21 is all photodetector.Photodetector 19,20 is connected with channel-splitting filter 18 respectively with 21.Computing machine 22 is connected with 21 with photodetector 19,20 respectively.
Semiconductor laser 11, semiconductor laser 12 and semiconductor laser 13 are respectively used to send the different three beams of laser light beam of wavelength, three beams of laser light beam is coupled into a branch of by wavelength division multiplexer 14, then after first collimator 15 focuses on, passes Carrier of liquid membrane 16.Laser beam through Carrier of liquid membrane 16 is focused on by the second collimating apparatus 17, then the laser beam after focusing is divided into the different three beams of laser light beam of wavelength by channel-splitting filter 18, the three beams of laser light beam that channel-splitting filter 18 sends collected respectively by photodetector 19, photodetector 20 and photodetector 21, the intensity of measuring laser beam, and be transferred to computing machine 22.Computing machine 22, for carrying out data processing, calculates the concentration of liquid film, thickness and temperature value.
< embodiment two >
The method of synchro measure liquid film concentration, thickness and temperature is as follows:
Step one, get the urea liquid liquid film that pure water and mass concentration are respectively 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, adopt absorption spectrum measuring apparatus to measure pure water and above-mentioned urea liquid liquid film respectively at wave number 6000 ~ 8000cm
-1, the absorption coefficient at 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C.
Step 2, pure water and all urea liquid films absorption coefficient are at different temperatures mapped to wave number value, be absorbed coefficient-wave number curve, the absorption coefficient value of all urea liquid films under more different wave number, selects wave number ν
1and ν
2, under making variable concentrations and different temperatures, the absorption coefficient of all urea liquid films is zero to the rate of change of concentration; Select wave number ν
3, under making variable concentrations and different temperatures, the absorption coefficient of all urea liquid films is zero to the rate of change of temperature.
Step 3, respectively at two wave number ν
1and ν
2under, matching is done to the temperature of the absorption coefficient corresponding to the urea liquid film of variable concentrations, different temperatures and urea liquid film, obtains following equation: K
i=f (T), i=1 in formula, 2, K
ibe concentration be c, temperature be the urea liquid film of T is ν to wave number
ithe absorption coefficient of light;
At wave number ν
3under, matching is done to the concentration of the absorption coefficient corresponding to the urea liquid film of variable concentrations, different temperatures and urea liquid film, obtains following equation: K
3=f (c), K in formula
3it is the absorption coefficient corresponding to urea liquid film that concentration is c, temperature is T.
Step 4, arrange quartz glass without the sky of liquid film as Carrier of liquid membrane 16, regulate semiconductor laser 11,12 and 13, making three semiconductor lasers export wave number is respectively ν
1, ν
2and ν
3laser beam.Adopting photodetector 19, photodetector 20 and photodetector 21 to measure through wave number after Carrier of liquid membrane 16 is respectively ν
1, ν
2and ν
3the intensity of three beams of laser light beam, light intensity I as a setting
01, I
02and I
03, light intensity as a setting.
Step 5, adopts needle-like dropper to draw urea liquid to be measured, drops on Carrier of liquid membrane 16, form liquid film to be measured.Keep the output wavelength of semiconductor laser 11, semiconductor laser 12 and semiconductor laser 13 constant, adopting photodetector 19, photodetector 20 and photodetector 21 to measure through the rear wave number of the Carrier of liquid membrane 16 being loaded with liquid film to be measured is respectively ν
1, ν
2and ν
3the intensity I of three beams of laser light beam
t1, I
t2and I
t3, as transmitted light intensity.
Step 6, adopts computing machine 22 to collect background light intensity I
0i(i=1,2,3) and transmitted light intensity I
ti(i=1,2,3), and carry out data processing.
According to Beer-Lambert law, transmissivity is expressed as:
τ in formula
ibe transmissivity, d is the thickness of liquid film to be measured.
Calculating liquid film to be measured to wave number is ν
1, ν
2and ν
3the logarithm ln τ of transmissivity of laser beam
i, (i=1,2,3), then:
lnτ
1＝-K
1d＝-f(T)d (1)，
lnτ
2＝-K
2d＝-f(T)d (2)，
lnτ
3＝-K
3d＝-f(c)d (3)，
Form by formula (1) and formula (2) temperature T and the thickness d that system of equations can solve liquid film to be measured, then the thickness d solved is brought in formula (3), the concentration c of liquid film to be measured can be tried to achieve.
The effect of embodiment and effect
The device 10 of synchro measure liquid film concentration, thickness and temperature involved by embodiment one, because semiconductor laser 11,12 and 13 can send the different three beams of laser light beam of wavelength respectively, photodetector 19,20 and 21 can measure the intensity of the three beams transmission laser light beam that channel-splitting filter 18 sends respectively, and be transferred to computing machine 22, computing machine 22 can calculate the concentration value of liquid film, one-tenth-value thickness 1/10 and temperature value, and therefore this device can measure the important parameter of the concentration of liquid film, thickness and temperature these three simultaneously.In addition, because first collimator 15 and arranging of the second collimating apparatus 17 can focus on laser beam, increase the intensity of the laser beam through liquid film, therefore, this device can realize high-precision measurement.
The synchro measure liquid film concentration provided according to embodiment two and the method for thickness, because the urea liquid film adopting absorption spectrum measuring apparatus to measure different quality concentration is respectively 6000 ~ 8000cm to wave number at different temperatures
-1the absorption coefficient of light, the absorption coefficient that comparison liquid film quality concentration and temperature cause is poor, chooses respectively and makes liquid film absorption coefficient be the wave number value ν of zero to the rate of change of concentration
1and ν
2, and absorption coefficient is the wave number value ν of zero to the rate of change of temperature
3, simulate wave number ν respectively
1and ν
2the equation of lower absorption coefficient and liquid film temperature, and wave number ν
3the equation of lower absorption coefficient and liquid film mass concentration, it is ν that the device 10 of the synchro measure liquid film concentration, thickness and the temperature that then adopt embodiment one to provide measures wave number
1, ν
2and ν
3laser through the light intensity after liquid film to be measured, business is imposed to draw the transmitance of liquid film to be measured to three beams of laser light beam with bias light, and then calculate the concentration value of liquid film to be measured, one-tenth-value thickness 1/10 and temperature value according to above-mentioned equation, therefore, the method synchronously can calculate the concentration of liquid film to be measured, thickness and temperature easily, has very strong practical value.
Certainly, the device of synchro measure liquid film concentration, thickness and temperature involved in the present invention and measuring method, be not merely defined in the content described in above embodiment.These are only the present invention conceive under basic explanation, and according to any equivalent transformation that technical scheme of the present invention is done, all should protection scope of the present invention be belonged to.
Claims (3)
1. a device for synchro measure liquid film concentration, thickness and temperature, is characterized in that, comprising:
Three LASER Light Source, for sending the different laser beam of wavelength;
Wavelength division multiplexer, is connected with three described LASER Light Source, and described in the three beams send three described LASER Light Source, laser beam is coupled into a branch of;
First collimator, is connected with described wavelength division multiplexer, focuses on the laser beam that described wavelength division multiplexer is coupled;
Carrier of liquid membrane, is arranged on immediately below described first collimator, and for carrying liquid film to be measured, the laser beam sent after described first collimator is focused on is through described liquid film to be measured;
Second collimating apparatus, is arranged on immediately below described Carrier of liquid membrane, for collecting the laser beam through described Carrier of liquid membrane, and focuses on this laser beam;
Channel-splitting filter, is connected with described second collimating apparatus, and the laser beam sent after described second collimating apparatus being focused on is divided into the different three beams of laser light beam of wavelength;
Three spectra collection components, are connected with described channel-splitting filter respectively, receive and measure the intensity of every Shu Suoshu laser beam that this channel-splitting filter separates; And
Computing machine, spectra collection component described with three is connected respectively, processes the intensity of the described laser beam that three described spectra collection components record, and calculates the concentration of described liquid film to be measured, thickness and temperature value.
2. the device of synchro measure liquid film concentration according to claim 1, thickness and temperature, is characterized in that:
Wherein, described LASER Light Source is semiconductor laser, and described spectra collection component is photodetector.
3. adopt the device of synchro measure liquid film concentration as claimed in claim 1, thickness and temperature to measure a method for the concentration of liquid film, thickness and temperature, it is characterized in that, comprise the following steps:
Step one, adopts absorption spectrum measuring apparatus to measure the absorption spectrum of solution liquid film of some variable concentrations, different temperatures, obtain described variable concentrations, different temperatures solution liquid film to the absorption coefficient of the light of different wave number;
Step 2, the solution liquid film of more described variable concentrations, different temperatures, to the absorption coefficient of the light of different wave number, selects three wave number ν
1, ν
2and ν
3, make the solution liquid film of described variable concentrations, different temperatures be ν to wave number
1and ν
2the absorption coefficient of light be zero to the rate of change of concentration, make the solution liquid film of described variable concentrations, different temperatures be ν to wave number
3the absorption coefficient of light be zero to the rate of change of temperature;
Step 3, respectively at two described wave number ν
1and ν
2under, matching is done to the temperature of the absorption coefficient corresponding to the solution liquid film of described variable concentrations, different temperatures and described solution liquid film, obtains following equation: K
i=f (T), i=1 in formula, 2, K
ibe concentration be c, temperature be the solution liquid film of T is ν to wave number
ithe absorption coefficient of light, at described wave number ν
3under, matching is done to the concentration of the absorption coefficient corresponding to the solution liquid film of described variable concentrations, different temperatures and described solution liquid film, obtains following equation: K
3=f (c), K in formula
3it is the absorption coefficient corresponding to solution liquid film that concentration is c, temperature is T;
Step 4, arranges the described Carrier of liquid membrane without liquid film, regulates three described LASER Light Source, and making three described LASER Light Source export wave number is respectively ν
1, ν
2and ν
3laser beam, adopt three described spectra collection components measure respectively through described be ν without wave number described after the Carrier of liquid membrane of liquid film
1, ν
2and ν
3the intensity of laser beam, light intensity I as a setting
0i(i=1,2,3);
Step 5, load liquid film to be measured on described Carrier of liquid membrane, after the Carrier of liquid membrane adopting three described spectra collection components to measure through liquid film to be measured described in load respectively, described wave number is ν
1, ν
2and ν
3the intensity of laser beam, as transmitted light intensity I
ti(i=1,2,3);
Step 6, adopts described computing machine to collect described background light intensity I
0i(i=1,2,3) and described transmitted light intensity I
ti(i=1,2,3), and carry out data processing, according to Beer-Lambert law, transmissivity is expressed as:
τ in formula
ibe transmissivity, d is the thickness of described liquid film to be measured,
Calculating described liquid film to be measured to described wave number is ν
1, ν
2and ν
3the logarithm ln τ of transmissivity of laser beam
i, (i=1,2,3), then:
lnτ
1＝-K
1d＝-f(T)d (1)，
lnτ
2＝-K
2d＝-f(T)d (2)，
lnτ
3＝-K
3d＝-f(c)d (3)，
Form by formula (1) and formula (2) temperature T and the thickness d that system of equations can solve described liquid film to be measured, the more described thickness d solved is brought in formula (3), the concentration c of described liquid film to be measured can be tried to achieve.
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| CN108981592A (en) * | 2018-06-25 | 2018-12-11 | 浙江大学 | Micro- thickness of liquid film and temperature measuring device and method in contact melting based on laser interference and decaying |
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| CN107084669A (en) * | 2017-05-17 | 2017-08-22 | 上海理工大学 | Pure water thickness of liquid film measuring system and measuring method |
| CN107421909A (en) * | 2017-05-17 | 2017-12-01 | 上海理工大学 | The measurement apparatus and method of non-transmissive surface of solids aqueous solution of urea liquid film multi-parameter |
| CN108458750A (en) * | 2018-03-09 | 2018-08-28 | 上海理工大学 | Gas-liquid two-phase multi-parameter method for synchronously measuring in pure water drop boiling process |
| CN108458750B (en) * | 2018-03-09 | 2020-05-05 | 上海理工大学 | Gas-liquid two-phase multi-parameter synchronous measurement method in pure water droplet boiling process |
| CN108981592A (en) * | 2018-06-25 | 2018-12-11 | 浙江大学 | Micro- thickness of liquid film and temperature measuring device and method in contact melting based on laser interference and decaying |
| CN108981592B (en) * | 2018-06-25 | 2021-08-17 | 浙江大学 | Device and method for measuring thickness and temperature of micro-liquid film in contact melting based on laser interference and attenuation |
| CN111150401A (en) * | 2019-12-30 | 2020-05-15 | 浙江大学 | Method for measuring tissue thickness by detecting emergent light intensity |
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