CN102735713A - High-precision seawater salinity gauge - Google Patents
High-precision seawater salinity gauge Download PDFInfo
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- CN102735713A CN102735713A CN2012102441828A CN201210244182A CN102735713A CN 102735713 A CN102735713 A CN 102735713A CN 2012102441828 A CN2012102441828 A CN 2012102441828A CN 201210244182 A CN201210244182 A CN 201210244182A CN 102735713 A CN102735713 A CN 102735713A
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Abstract
The invention discloses a high-precision seawater salinity gauge which comprises a conductance cell, a thermostatic bath, a high-precision standard resistor, a sine-wave generator, voltage signal converters, a single chip microcomputer and an upper computer. The conductance cell is an electrode type conductance cell, is arranged in the thermostatic bath and contains measured seawater sample; the sine-wave generator is connected with an electrode of the conductance cell and the high-precision standard resistor respectively; the electrode of the conductance cell and the high-precision standard resistor are respectively connected with voltage signal converters; the voltage signal converters are connected with the single chip microcomputer through an A/D (Analog to Digital) converter; and the single chip microcomputer is connected with the upper computer. The high-precision seawater salinity gauge uses the high-precision standard resistor to stimulate the conduction characteristics of the standard seawater to measure the seawater salinity at high precision. The gauge has the characteristics of good stability, high measuring precision, convenient operation and high degree of automation, can be taken as a measuring standard device in the salinity measuring value system and has wide application prospect.
Description
Technical field
The present invention relates to the measurement mechanism of salinity key element, particularly a kind of high precision seawater salinity measurement mechanism of using single conductance cell.
Background technology
Salinity is basic oceanographic hydrological element, and all the distribution with seawater salinity is relevant with variation with variation in the generation of many phenomenons in the oceans such as sea water mixing, ocean circulation, underwater sound propagation and halobiontic procreation growth.Salinity is one of important measurement project of oceanographic survey, oceanographic observation and marine pollution monitoring.
Demarcate justice according to PSS-78 salt, seawater salinity is recently to confirm through the conductivity of sample and urnormal, the general apparatus structure that adopts two conductance cells of the high precision seawater salinity surveying instrument of prior art.Fig. 1 shows the basic structure of existing pair of conductance cell seawater salinity surveying instrument, comprises standard conductance cell 5, tested conductance cell 6, sine-wave generator 8, calibration cell 7, voltage signal converter, single-chip microcomputer 3, host computer 2.Standard conductance cell 5 places in the calibration cell 7 with tested conductance cell 6, and sine-wave generator 8 connects the lateral electrode of standard conductance cell 5 and tested conductance cell 6 respectively, and the medial electrode of standard conductance cell 5 and tested conductance cell 6 is connected the voltage signal converter respectively.The voltage signal converter connects single-chip microcomputer 3 through A/D converter 4, and single-chip microcomputer 3 connects host computer 2 and display screen 1.
Standard conductance cell 5 is equipped with urnormal, and tested conductance cell 6 is equipped with tested seawater sample, and the temperature control effect of calibration cell 7 makes the maintenance temperature of standard conductance cell 5 and tested conductance cell 6 consistent.The voltage signal converter is gathered the sine voltage signal that sine-wave generator 8 sends from the medial electrode in the conductance cell; Send single-chip microcomputer 3 to through A/D converter 4 again; The conductivity that obtains tested conductance cell 6 and standard conductance cell 5 than and calculate the salinity value of tested seawater, send then that host computer 10 is stored to and show by display screen 9.
The seawater salinity surveying instrument of the two conductance cells of the employing of above-mentioned prior art is very high to temperature controlled requirement, and the standard conductance cell should have identical temperature with tested conductance cell, is 0.002 o'clock if will reach the salimity measurement accuracy; Temperature homogeneity should be 0.001 ℃ at least; First-class standard platinum resistance accuracy is 0.001 ℃ in the existing ITS-90 temperature scale, therefore, is 0.001 ℃ thermostat if reach homogeneity; Not only bulky, and cost is also very high.
Summary of the invention
The existing problem of seawater salinity surveying instrument to two conductance cells of prior art; The present invention releases the seawater salinity measuring instrument of single conductance cell; Its purpose is the conductive characteristic with high precision measuring resistance mock standard seawater; Tested seawater sample conductance cell will be housed be connected with single-chip microcomputer, measurement data handled, to realize the high-acruracy survey of seawater salinity by single-chip microcomputer as the metering circuit that " resistive element " is connected with the high precision measuring resistance.
The high precision seawater salinity measuring instrument that the present invention relates to comprises conductance cell, calibration cell, high precision measuring resistance, sine-wave generator, voltage signal converter, single-chip microcomputer, host computer etc.Conductance cell is the electric pole type conductance cell; Place in the calibration cell and fill tested seawater sample; Sine-wave generator connects the electrode and the high precision measuring resistance of conductance cell respectively; The electrode of conductance cell is connected a voltage signal converter separately with the high precision measuring resistance, and the voltage signal converter connects single-chip microcomputer through A/D converter, and single-chip microcomputer connects host computer.
The high precision measuring resistance has the conductive characteristic identical with urnormal, and accuracy is ten thousand/, degree of stability is 2ppm.
One end of high precision measuring resistance connects sine-wave generator, and the other end connects the precision resistance of ground connection, and precision resistance connects sine-wave generator through feedback line.
Conductance cell is made by high-quality glass, is rectangular shape, interior dress platinum electrode.4 electrodes are set in the conductance cell, and 2 lateral electrodes and 2 medial electrodes, 4 electrodes laterally arrange and are immersed in the seawater in the conductance cell, and 2 medial electrodes are arranged between 2 lateral electrodes, and an end of 4 electrodes is fixedly connected by insulating material.The medial electrode of conductance cell connects the voltage signal converter.
Sine-wave generator output precision sine wave voltage signal is transported in the conductance cell seawater through lateral electrode of connected conductance cell.Another lateral electrode of conductance cell connects the precision resistance of ground connection, and precision resistance connects sine-wave generator through feedback line, and the precision resistance voltage is remained unchanged, and makes the voltage signal between conductance cell two medial electrodes stable.
Voltage between conductance cell two medial electrodes is measured by the voltage signal converter, and calculates the equivalent resistance between conductance cell two medial electrodes by formula (1).
Sine-wave generator output precision sine wave voltage signal; Link to each other with the high precision measuring resistance of mock standard seawater conductive characteristic; The high precision measuring resistance links to each other with the precision resistance of ground connection; Precision resistance connects sine-wave generator through feedback line, and the precision resistance voltage is remained unchanged, and makes high precision standard resistor at two terminals voltage signal stable.
The voltage of high precision measuring resistance is measured by the voltage signal converter, and calculates the resistance value of high precision measuring resistance by formula (2).
R
1The precision resistance that-conductance cell lateral electrode connects
V
R1-precision resistance R
1Voltage
V
N1Voltage between-conductance cell medial electrode
R
X1Equivalent resistance between-conductance cell two medial electrodes
R
2-high precision measuring resistance R
0The precision resistance that connects
V
R2-precision resistance R
2Voltage
V
N2-high precision measuring resistance R
0Voltage
R
X2-high precision measuring resistance R
0Resistance value
The ratio of the equivalent resistance of the conductance cell that calculates and high precision measuring resistance is the ratio r that contains tested seawater and the conductivity of urnormal in the conductance cell
t, see formula (3).
And then utilize PSS-78 salt mark to calculate tested seawater salinity value, and be transferred to display screen and show with host computer and store.
The present invention with the high precision measuring resistance as measuring basis resistance; The conductive characteristic of direct modeling urnormal not only has the measurement characteristics of urnormal fully, and more stable than the electric conductivity of urnormal in measuring; Increase the stability of seawater salinity measuring instrument; Reduce requirement greatly, reduce the volume of calibration cell, the physical arrangement of minimizing standard conductance cell the calibration cell temperature homogeneity, and then the cost of reduction seawater salinity measuring instrument.
The high precision seawater salinity measuring instrument accuracy of measurement that the present invention relates to is high; Accuracy of measurement is superior to 0.002, and good stability is easy and simple to handle; Automaticity is high; Can be used as the measurement standard device in the salt metric system, also can be widely used in the salimity measurement in ocean observation station, research ship, offshore platform and the laboratory, have broad application prospects.
Description of drawings
Fig. 1 is the basic structure synoptic diagram of existing two conductance cell seawater salinity surveying instruments.
Fig. 2 is the high precision seawater salinity measuring instrument structural representation that the present invention relates to.
Description of symbols among the figure:
1, display screen 2, host computer
3, single-chip microcomputer 4, A/D converter
5, standard conductance cell 6, tested conductance cell
7, calibration cell 8, sine-wave generator
9, display screen 10, host computer
11, single-chip microcomputer 12, A/D converter
13, conductance cell 14, calibration cell
15, sine-wave generator R
0, the high precision measuring resistance
L
1, the first voltage signal converter L
2, the second voltage signal converter
R
1, precision resistance R
2, precision resistance
V
R1, R
1Voltage V
R2, R
2Voltage
V
R0, R
0Voltage V
N, voltage between the conductance cell medial electrode
Embodiment
Combine accompanying drawing that technical scheme of the present invention is described further, Fig. 2 shows basic structure of the present invention, and is as shown in the figure at present, and the high precision seawater salinity measuring instrument that the present invention relates to comprises conductance cell 13, calibration cell 14, high precision measuring resistance R
0, sine-wave generator 15, the first voltage signal converter L
1, the second voltage signal converter L
2, single-chip microcomputer 11, host computer 10 etc.
Conductance cell 13 places in the calibration cell 14, fills tested seawater sample.Conductance cell 13 is the electric pole type conductance cell, is made by high-quality glass, is rectangular shape, interior dress platinum electrode.4 electrodes are set in the conductance cell 13, and 2 lateral electrodes and 2 medial electrodes, 4 electrodes laterally arrange and are immersed in the seawater in the conductance cell, and 2 medial electrodes are arranged between 2 lateral electrodes, and an end of 4 electrodes is fixedly connected by insulating material.
Sine-wave generator 15 connects a lateral electrode of conductance cell 13, exports the precision sine wave voltage signal in the seawater of conductance cell 13 through lateral electrode.Conductance cell 13 another lateral electrodes connect the precision resistance R of ground connection
1, precision resistance R
1Connect sine-wave generator 15 through feedback line, make precision resistance R
1Voltage V
R1Remain unchanged, and make voltage V between conductance cell 13 medial electrodes
N1Signal stabilization.
Sine-wave generator 15 connects high precision measuring resistance R
0An end, high precision measuring resistance R
0The other end connect ground connection precision resistance R
2, precision resistance R
2Connect sine-wave generator 15 through feedback line, make precision resistance R
2Voltage V
R2Remain unchanged, and make high precision measuring resistance R
0Voltage V
R0Signal stabilization.
The medial electrode of conductance cell 13 connects the first voltage signal converter L
1, high precision measuring resistance R
0Connect the second voltage signal converter L
1, the first voltage signal converter L
1With the second voltage signal converter L
1Connect single-chip microcomputer 11 through A/D converter 12, single-chip microcomputer 11 connects host computer 10.
Claims (4)
1. a high precision seawater salinity measuring instrument is characterized in that, comprises conductance cell (13), calibration cell (14), high precision measuring resistance (R
0), sine-wave generator (15), voltage signal converter, single-chip microcomputer (11), host computer (10); Conductance cell (13) is the electric pole type conductance cell; Place in the calibration cell (14) and fill tested seawater sample, sine-wave generator (15) connects electrode and the high precision measuring resistance (R in the conductance cell (13)
0), electrode and high precision measuring resistance (R in the conductance cell (13)
0) connecting a voltage signal converter separately, the voltage signal converter connects single-chip microcomputer (11) through A/D converter (12), and single-chip microcomputer (11) connects host computer (10); High precision measuring resistance (R
0) having a conductive characteristic identical with urnormal, accuracy is ten thousand/, degree of stability is 2ppm.
2. high precision seawater salinity measuring instrument according to claim 1 is characterized in that, said high precision measuring resistance (R
0) an end connect sine-wave generator (15), the other end connects the second precision resistance (R of ground connection
2), the second precision resistance (R
2) connect sine-wave generator (15) through feedback line; High precision measuring resistance (R
0) the connection second voltage signal converter (L
2).
3. high precision seawater salinity measuring instrument according to claim 1; It is characterized in that; In the said conductance cell (13) that places in the calibration cell (14) 4 electrodes are set, 2 lateral electrodes and 2 medial electrodes, 4 electrodes laterally arrange and are immersed in the seawater in the conductance cell (13); 2 medial electrodes are arranged between 2 lateral electrodes, and an end of 4 electrodes is fixedly connected by insulating material.
4. high precision seawater salinity measuring instrument according to claim 3 is characterized in that, a lateral electrode of conductance cell (13) connects sine-wave generator (15), and another lateral electrode connects the first precision resistance (R of ground connection
1), the first precision resistance (R
1) connect sine-wave generator (15) through feedback line; Two medial electrodes of conductance cell (13) connect the first voltage signal converter (L
1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102441828A CN102735713A (en) | 2012-07-16 | 2012-07-16 | High-precision seawater salinity gauge |
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|---|---|---|---|
| CN2012102441828A CN102735713A (en) | 2012-07-16 | 2012-07-16 | High-precision seawater salinity gauge |
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| CN102735713A true CN102735713A (en) | 2012-10-17 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188099A (en) * | 2018-09-12 | 2019-01-11 | 湖南宝德机电设备有限公司 | A kind of liquid electric conductivity detection system |
| CN109405866A (en) * | 2018-09-19 | 2019-03-01 | 国家海洋技术中心 | The testing calibration method and device of thermohaline depth measuring instrument based on multiple spot thermostatic water bath |
| CN110320244A (en) * | 2019-07-29 | 2019-10-11 | 山东省科学院海洋仪器仪表研究所 | A kind of seawater salinity measuring system and method based on orthogonal lock-in-amplifier technology |
| CN110412080A (en) * | 2019-07-03 | 2019-11-05 | 山东省科学院海洋仪器仪表研究所 | A kind of thermohaline depth sensor and the control method for inhibiting heating stagnation curve |
| US10876962B2 (en) | 2016-06-03 | 2020-12-29 | Shenzhen Polytechnic | Method and device for on-line detection of salinity of seater |
| CN114324489A (en) * | 2021-12-20 | 2022-04-12 | 中电科技集团重庆声光电有限公司 | Solution ion concentration measuring method based on conductivity measurement |
| CN114858867A (en) * | 2022-07-11 | 2022-08-05 | 国家海洋技术中心 | Single-control temperature point calibration method of electromagnetic induction type conductivity sensor |
| CN115753682A (en) * | 2022-11-07 | 2023-03-07 | 山东大学 | Seawater salinity measuring device and method with temperature self-decoupling function |
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| SU1733989A1 (en) * | 1989-03-06 | 1992-05-15 | Ленинградский филиал Государственного проектно-изыскательского и научно-исследовательского института морского транспорта "Союзморниипроект" | Method of determining a sea water salt level and device thereof |
| RU1777061C (en) * | 1989-09-11 | 1992-11-23 | Специальное конструкторско-технологическое бюро Морского гидрофизического института АН УССР | Method of real-time measurement of salt content in sea water |
| CN2596356Y (en) * | 2003-02-17 | 2003-12-31 | 国家海洋技术中心 | Laboratory salinometer |
| CN201965112U (en) * | 2011-01-25 | 2011-09-07 | 国家海洋标准计量中心 | High-precision seawater salinity measuring device |
-
2012
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Patent Citations (5)
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| SU1017993A1 (en) * | 1981-08-14 | 1983-05-15 | Всесоюзный научно-исследовательский институт сельскохозяйственной метеорологии | Loose material humidity measuring device |
| SU1733989A1 (en) * | 1989-03-06 | 1992-05-15 | Ленинградский филиал Государственного проектно-изыскательского и научно-исследовательского института морского транспорта "Союзморниипроект" | Method of determining a sea water salt level and device thereof |
| RU1777061C (en) * | 1989-09-11 | 1992-11-23 | Специальное конструкторско-технологическое бюро Морского гидрофизического института АН УССР | Method of real-time measurement of salt content in sea water |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10876962B2 (en) | 2016-06-03 | 2020-12-29 | Shenzhen Polytechnic | Method and device for on-line detection of salinity of seater |
| CN109188099A (en) * | 2018-09-12 | 2019-01-11 | 湖南宝德机电设备有限公司 | A kind of liquid electric conductivity detection system |
| CN109405866A (en) * | 2018-09-19 | 2019-03-01 | 国家海洋技术中心 | The testing calibration method and device of thermohaline depth measuring instrument based on multiple spot thermostatic water bath |
| CN109405866B (en) * | 2018-09-19 | 2024-04-12 | 国家海洋技术中心 | Detection calibration method and device of temperature and salt depth measuring instrument based on multipoint constant-temperature water tank |
| CN110412080A (en) * | 2019-07-03 | 2019-11-05 | 山东省科学院海洋仪器仪表研究所 | A kind of thermohaline depth sensor and the control method for inhibiting heating stagnation curve |
| CN110412080B (en) * | 2019-07-03 | 2021-12-21 | 山东省科学院海洋仪器仪表研究所 | Temperature, salinity and depth sensor and control method for inhibiting thermal hysteresis effect |
| CN110320244A (en) * | 2019-07-29 | 2019-10-11 | 山东省科学院海洋仪器仪表研究所 | A kind of seawater salinity measuring system and method based on orthogonal lock-in-amplifier technology |
| CN114324489A (en) * | 2021-12-20 | 2022-04-12 | 中电科技集团重庆声光电有限公司 | Solution ion concentration measuring method based on conductivity measurement |
| CN114324489B (en) * | 2021-12-20 | 2024-05-14 | 中电科芯片技术(集团)有限公司 | Solution ion concentration measuring method based on conductivity measurement |
| CN114858867A (en) * | 2022-07-11 | 2022-08-05 | 国家海洋技术中心 | Single-control temperature point calibration method of electromagnetic induction type conductivity sensor |
| CN115753682A (en) * | 2022-11-07 | 2023-03-07 | 山东大学 | Seawater salinity measuring device and method with temperature self-decoupling function |
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Application publication date: 20121017 |