CN117630312A - Non-contact salinity monitoring method for high-salinity environment - Google Patents
Non-contact salinity monitoring method for high-salinity environment Download PDFInfo
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- CN117630312A CN117630312A CN202311520990.7A CN202311520990A CN117630312A CN 117630312 A CN117630312 A CN 117630312A CN 202311520990 A CN202311520990 A CN 202311520990A CN 117630312 A CN117630312 A CN 117630312A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000012544 monitoring process Methods 0.000 title claims abstract description 17
- 238000004364 calculation method Methods 0.000 claims description 14
- 239000013535 sea water Substances 0.000 claims description 14
- 238000013178 mathematical model Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 27
- 150000003839 salts Chemical class 0.000 description 15
- 239000000243 solution Substances 0.000 description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 9
- 239000011521 glass Substances 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000004927 clay Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- 208000034699 Vitreous floaters Diseases 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a non-contact salinity monitoring method for a high-salinity environment, which is characterized in that the surface humidity and temperature of an object to be measured are measured through a temperature and humidity sensor, signals are analyzed, mathematical relations of the relative humidity and the salinity of solutions under different concentrations are obtained preliminarily, mathematical models are built and the mathematical models are continuously corrected, and the relation of the relative humidity and the salinity of the solutions under different concentrations is accurately obtained, so that a novel salinity measuring method, namely a relative humidity salinity measuring method, is obtained.
Description
Technical Field
The invention belongs to the technical field of salinity monitoring, and particularly relates to a non-contact salinity monitoring method for a high-salinity environment.
Background
In high-salt environments (such as salt lakes or coastal areas), accurate observation of water salinity is particularly important, and measurement of water salinity is an essential step of most hydraulic engineering experiments, and has important significance for measuring salinity of other mediums such as water salinity.
In the process of using a salinity sensor in the field during measuring the salinity of a water body, the salinity sensor is arranged on the surface of the water body, the salinity content in the water body is detected through the salinity sensor, the method can not accurately measure the salinity when the salinity is higher like a high-salinity lake or seawater, the method for measuring the salinity of the water body generally comprises a Knudsen salinity measuring method, a microwave remote sensing technology method, a conductivity measuring method and a refractive index measuring method, the Knudsen salinity measuring method has limited measuring precision and is only suitable for being used under the current salinity standard, the Knudsen salinity measuring method relates to a plurality of instruments, the experimental link requires that the salinity can only be measured in a laboratory, the salinity can not be continuously detected in the field, the salinity on the surface of the water body is detected through the microwave remote sensing technology method, the salinity on the surface is required to be simultaneously detected, the conductivity, the temperature and the depth are further marked, errors caused by the asynchronous detection of three parameters exist, the electrode is fragile and is easy to be damaged, the electrode is easy to be polluted by water quality and electromagnetic interference, the measuring precision is influenced, the refractive relation between the salinity and the light is complex, the refractive index measuring method is related to the salinity of the seawater and the refractive index measuring method, the temperature is not always required to be higher than the salinity value when the salinity is reasonably obtained along with the high value of the salinity measured in the water body (the high value is obtained through the strict, the strict value, the salt value is generally at the same time, the value is obtained by the salinity value, and the salt value is not obtained in the water body). Therefore, a non-contact monitoring method capable of accurately measuring the salinity of the surface water in a high-salt environment is designed to solve the problems.
Disclosure of Invention
According to the defects of the prior art, the invention provides a non-contact type salinity monitoring method for a high-salinity environment, which is characterized in that the surface humidity and the temperature of an object to be measured are measured through a temperature and humidity sensor, signals are analyzed, mathematical relations of the relative humidity and the salinity of solutions under different concentrations are obtained preliminarily, mathematical models are built and the mathematical models are corrected continuously, and the relation of the relative humidity and the salinity of the solutions under different concentrations is obtained accurately, so that a new salinity measuring method, namely a relative humidity salinity measuring method, is obtained.
The invention is realized by the following technical scheme:
a non-contact salinity monitoring method for a high salinity environment, characterized in that the monitoring method comprises the steps of:
s1, constructing a mathematical calculation model related to salinity:
S=a1T+a2H+a3
wherein:
Sthe salinity of the sample to be measured;
Tthe surface temperature of the sample to be measured;
Hthe surface humidity of the sample to be measured;
a1、a2、a3respectively solving constants;
s2: the temperature and humidity sensor is arranged in the porous floater;
s3: preparing at least three groups of samples to be tested with different salinity; placing the porous floating objects on the surfaces of different samples to be tested, and measuring the surface humidity of the samples to be tested through the temperature and humidity sensorHAnd surface temperatureT；
S4: the salinity S and the surface humidity of the three groups of samples to be tested are measuredHAnd surface temperatureTRespectively substituting into the mathematical calculation models in the step S1 to obtaina1、a2、a3A specific value of the constant;
s5: according to the salinity mathematical calculation model obtained by solving in the step S4, placing the porous floating object on a sample to be measured with unknown salinity, and measuring the surface humidity of the sample to be measured by the temperature and humidity sensorHAnd surface temperatureTSubstituting the salinity mathematical calculation model to solve and obtain the salinity of the sample to be measured.
The sample to be measured is a high-salt lake or seawater.
The invention has the advantages that: according to the non-contact salinity monitoring method for the high-salinity environment, the temperature and humidity sensor is used for measuring the surface humidity and the temperature of an object to be measured and analyzing signals, the mathematical relationship between the relative humidity and the salinity of solutions under different concentrations is obtained preliminarily, the mathematical model is built and the mathematical model is continuously corrected, and the relationship between the relative humidity and the salinity of the solutions under different concentrations is accurately obtained, so that a new salinity measuring method, namely a relative humidity salinity measuring method, is obtained.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic diagram of the experimental procedure in the present invention;
FIG. 3 is a table of data obtained by initially setting salt concentration in the present invention;
FIG. 4 is a graph of actual salinity values versus fitted salinity values in the present invention;
fig. 5 is a schematic structural view of a porous float according to the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings, to facilitate understanding by those skilled in the art:
as shown in fig. 1-5, the labels in the figures are respectively: a handle 1, a conical glass cover 2, a temperature and humidity sensor 3 and a clay plate 4.
Examples: as shown in fig. 1-5, the present embodiment relates specifically to a non-contact salinity monitoring method for a high-salt environment, the non-contact salinity monitoring method comprising the steps of:
s1: constructing a mathematical calculation model about salinity, wherein the mathematical calculation model is as follows:S=a1T+a2H+a3
wherein:
Sthe salinity of the sample to be measured;
Tthe surface temperature of the sample to be measured;
Hto be treatedMeasuring the surface humidity of the sample;
a1、a2、a3respectively solving constants;
it should be noted that the sample to be measured includes high-salt lakes and seawater.
S2: as shown in fig. 5, the temperature and humidity sensor 3 is installed in the porous floating object, and includes a clay plate 4, a conical glass cover 2 provided on the clay plate 4, and a handle 1 fixed on the conical glass cover 2, wherein the temperature and humidity sensor 3 is specifically provided in a surrounding space of the conical glass cover 2 and the clay plate 4, and the model of the temperature and humidity sensor is DHT22. Can protect temperature and humidity sensor 3 when observing temperature and humidity sensor 3 through coniform glass cover 2, very big avoid external factor to temperature and humidity sensor 3's influence for temperature and humidity sensor 3's measuring result is more accurate, and fixedly connected with handle 1 on coniform glass cover 2's top, can be convenient for take coniform glass cover 2 through handle 1, and handle 1 is the floater, can reduce handle 1 when measuring liquid, coniform glass cover 2 and porous ceramic plate 4's whole weight, make porous ceramic plate 4 can float on the surface of liquid, handle 1, coniform glass cover 2 and porous ceramic plate 4's installation schematic diagram is as shown in fig. 5
S3: preparing at least three groups of samples to be tested with different salinity; placing porous floating matters on the surfaces of different samples to be tested, and measuring the surface humidity of the samples to be tested through the temperature and humidity sensor 3HAnd surface temperatureT。
S4: the salinity S and the surface humidity of the three groups of samples to be tested are measuredHAnd surface temperatureTRespectively substituting the obtained values into the mathematical calculation model in the step S1, and correcting the influence of experimental errors, temperature and other factors on the mathematical calculation model to obtaina1、a2、a3A specific value of the constant.
S5: according to the salinity mathematical calculation model obtained by solving in the step S4, placing the porous floating object on a sample to be measured with unknown salinity, and measuring the surface humidity of the sample to be measured by the temperature and humidity sensorHAnd surface temperatureTSubstituting the salinity mathematical calculation model to solve and obtain the salinity of the sample to be measured.
In summary, according to the method for in-situ monitoring of the salinity of the high-salt lake or the seawater in the high-salt environment, a plurality of groups of samples are arranged, the samples are measured respectively, measured data are obtained, the trend relationship between the salinity of the water body and the humidity at the position close to the water surface is obtained through comparison among the data, the result that the humidity above the liquid level is in a reduced trend along with the increase of the salinity is obtained, the salt content of the high-salt lake or the seawater is represented by establishing the relationship between the humidity and the salinity, and the salt content of the high-salt lake or the seawater can be obtained by measuring the humidity of the high-salt lake or the seawater, so that the salinity of the high-salt lake or the seawater can be measured more accurately and conveniently.
As shown in fig. 2, the following experimental cases were adopted in this example:
1) Preparing the required items for the experiment: paper cup, naCl crystal particles, water, an electronic scale, a measuring cylinder and a stirring rod.
2) Selecting a measuring device required by an experiment: DHT22 temperature and humidity sensor and data acquisition board.
3) And selecting and preliminarily setting the salt concentration according to the experimental object.
4) Preparing salt solutions with various concentrations, selecting a plurality of paper cups, measuring 100g of water through a measuring cylinder and an electronic scale, pouring 100g of water into the paper cups, weighing the mass of NaCl crystal particles required by various concentrations through the measuring cylinder and the electronic scale, adding the NaCl crystal particles into the prepared interior, stirring the water in the paper cups through a stirring rod, waiting for the full dissolution of the NaCl crystal particles, and fully mixing the water with the NaCl crystal particles.
5) The temperature and humidity sensor is connected with the data acquisition board, the data acquisition board is connected with the computer, specific software is downloaded on the computer, a group of data is read after 2s is set, and the computer display shows room temperature and air humidity when the display number is stable.
6) And fixing the temperature and humidity sensor at a position inside a paper cup and close to the water surface, and recording 60-100 data after the indication is stable.
7) And taking the temperature and humidity sensor out of the paper cup, and waiting for the temperature sensor to restore the room temperature and the air humidity.
8) And (5) repeating the steps 6 and 7, completing the measurement work of the solution in the rest paper cup, and recording the data of the solution in the rest paper cup.
9) And processing the recorded data of the solutions inside the paper cups to obtain the trend relationship between the salinity of the water body and the humidity of the position close to the water surface (the distance from the water surface is not more than 1 mm).
The salt concentration preliminarily set in the step 3 is 0ppt, 25ppt, 50ppt, 75ppt, 100ppt, 150ppt, 200ppt, 250ppt and 300ppt, when the salinity of the sample obtained by looking up the data is about 300ppt, the influence on evaporation becomes more obvious, so that the salt concentration is preliminarily set to be lower than 300ppt, and the salt concentrations of a plurality of steps are set, thereby obtaining more accurate experimental data, and the sample in the step 3 comprises a high-salt lake and seawater, when the sample is a high-salt lake, the salt concentration selected is 0ppt, 25ppt, 50ppt, 75ppt, 100ppt, 150ppt, 200ppt and 250ppt, and when the sample is seawater, the salt content of the high-salt lake is known to be about 60ppt to 10ppt by looking up the data, and the water content of the high-salt lake is generally between 100ppt and 300ppt, so that the salt concentration of the high-salt lake is lower than 30% is set, so that the result is more accurate.
Setting a plurality of experimental groups according to the preliminary salt concentrations of 0ppt, 25ppt, 50ppt, 75ppt, 100ppt, 150ppt, 200ppt, 250ppt, 300ppt in step 3, respectively, and configuring salt solutions of 0ppt, 25ppt, 50ppt, 75ppt, 100ppt, 150ppt, 200ppt, 250ppt, 300ppt, and measuring the temperature and humidity (temperature and humidity sensor No. 1) at the position close to the water surface by a temperature and humidity sensor, and recording experimental data obtained for each experimental group, preparing a table such as fig. 3 according to the experimental data, and fitting between salinity, humidity and temperature according to the measured data, whereina1=-28、a2=-61Anda3= 3358fitting results r2=94%.
When the selected experimental object is seawater, the temperature and humidity of the position close to the water surface are measured through the temperature and humidity sensor (No. 2 temperature and humidity sensor), and the obtained real state of each experimental group is recordedTest data, a table made from the test data is shown in FIG. 3, and a graph is drawn from the measured data, and fitting between salinity, humidity and temperature is performed from the measured data, whereina1=-39、a2=-79Anda3=4606fitting results r2=83%. From fig. 3-4, it can be concluded that limiting the temperature to a range of ±1 ℃ leads to a decreasing trend of humidity above the liquid (not more than 1mm from the water surface) with increasing salinity, and that it is theoretically practically feasible to express the salt content of seawater by establishing a relationship between humidity, salinity and temperature.
In order to ensure that the results of the experiment are more accurate, the following matters should be taken into consideration when the experiment is performed:
(1) When experiments are carried out, one temperature and humidity sensor is used as much as possible, if two temperature and humidity sensors are adopted to ensure that the concentration of each measured object is continuous, for example, a No. 1 temperature and humidity sensor is used for measuring a solution with the salinity less than 100ppt, and a No. 2 temperature and humidity sensor is used for measuring a solution with the salinity greater than 100 ppt;
(2) The salinity solution is enough to be read, and the reading is recorded after the data is stable, so that the condition of false stability of the data is avoided;
(3) The temperature and humidity sensor is fixed by hand directly in the measuring process, the positions of the temperature and humidity sensors in each group are not uniform by fixing the temperature and humidity sensors by hand, and then the positions of the temperature and humidity sensors are different from each other, and when the temperature and humidity sensors are held by hand, a certain temperature is reached by a human hand, so that the temperature measured by the temperature and humidity sensors is higher, the measuring precision is influenced, the temperature and humidity sensors can be placed on porous floaters, and the influence on water surface evaporation is reduced.
The beneficial effects of this embodiment are: according to the non-contact salinity monitoring method for the high-salinity environment, the temperature and humidity sensor is used for measuring the surface humidity and the temperature of an object to be measured and analyzing signals, the mathematical relationship between the relative humidity and the salinity of solutions under different concentrations is obtained preliminarily, the mathematical model is built and the mathematical model is continuously corrected, and the relationship between the relative humidity and the salinity of the solutions under different concentrations is accurately obtained, so that a new salinity measuring method, namely a relative humidity salinity measuring method, is obtained.
Claims (2)
1. A non-contact salinity monitoring method for a high salinity environment, characterized in that the monitoring method comprises the steps of:
s1, constructing a mathematical calculation model related to salinity:
S=a1T+a2H+a3
wherein:
Sthe salinity of the sample to be measured;
Tthe surface temperature of the sample to be measured;
Hthe surface humidity of the sample to be measured;
a1、a2、a3respectively solving constants;
s2: the temperature and humidity sensor is arranged in the porous floater;
s3: preparing at least three groups of samples to be tested with different salinity; placing the porous floating objects on the surfaces of different samples to be tested, and measuring the surface humidity of the samples to be tested through the temperature and humidity sensorHAnd surface temperatureT；
S4: the salinity S and the surface humidity of the three groups of samples to be tested are measuredHAnd surface temperatureTRespectively substituting into the mathematical calculation models in the step S1 to obtaina1、a2、a3A specific value of the constant;
s5: according to the salinity mathematical calculation model obtained by solving in the step S4, placing the porous floating object on a sample to be measured with unknown salinity, and measuring the surface humidity of the sample to be measured by the temperature and humidity sensorHAnd surface temperatureTSubstituting the salinity mathematical calculation model to solve and obtain the salinity of the sample to be measured.
2. The method for non-contact salinity monitoring in a high-salinity environment according to claim 1, wherein the sample to be tested is a high-salinity lake or seawater.
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| CN202311520990.7A CN117630312A (en) | 2023-11-15 | 2023-11-15 | Non-contact salinity monitoring method for high-salinity environment |
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| CN202311520990.7A CN117630312A (en) | 2023-11-15 | 2023-11-15 | Non-contact salinity monitoring method for high-salinity environment |
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