CN113063988B - Double-cell conductivity sensor sharing intermediate electrode plate and preparation method thereof - Google Patents
Double-cell conductivity sensor sharing intermediate electrode plate and preparation method thereof Download PDFInfo
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- CN113063988B CN113063988B CN202110297044.5A CN202110297044A CN113063988B CN 113063988 B CN113063988 B CN 113063988B CN 202110297044 A CN202110297044 A CN 202110297044A CN 113063988 B CN113063988 B CN 113063988B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/22—Measuring resistance of fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R3/00—Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments, e.g. of probe tips
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
A double-pool conductivity sensor sharing an intermediate electrode plate and a preparation method thereof relate to the field of ocean measuring instruments, in particular to a seawater conductivity sensor. The invention aims to solve the problems that when the traditional electrode type conductivity sensor is used for switching the large range and the small range, the conductivity cell probe needs to be replaced, and the stability of the signal output of the sensor is poor. The electrode groups are arranged on two sides of the electrode plate positioned in the middle of the conductivity sensor core body, the electrode groups on two sides are arranged in a mirror symmetry mode, the electrode groups are arranged on one side of the electrode plate positioned on two sides, the electrode groups on the electrode plate positioned on two sides are opposite to the electrode groups on the electrode plate positioned in the middle, and the electrode groups comprise current electrodes and voltage electrodes. The four electrode plates of the two conductivity cells are reduced to three electrode plates, and the middle electrode plate is shared by the two conductivity cells, so that the whole volume of the sensor is reduced to half of the original volume.
Description
Technical Field
The invention belongs to the field of ocean measuring instruments, and particularly relates to a seawater conductivity sensor.
Background
The seawater salinity parameter not only can be used for monitoring the flowing, circulating and climate change processes of the seawater, but also has great significance in researching climate problems, monitoring marine ecological environment and the like. The measurement of the seawater salinity is realized by measuring the seawater conductivity, and the measurement of the seawater salinity by utilizing a conductivity sensor has the advantages of high accuracy, high speed and convenience for on-site measurement, and the measurement of the seawater conductivity has become an important means for measuring the seawater salinity. Therefore, sensors for measuring the conductivity of seawater in situ are important marine measuring instruments.
The sensor for measuring sea water conductivity in site is mainly divided into an induction type sensor and an electrode type sensor, and has the corresponding application range and characteristics respectively. In the electrode type conductivity sensor, a conductivity cell is an important measuring element, and a closed or semi-closed structure mode is adopted in most cases. The existing electrode type conductivity sensor conductivity cell structure is generally divided into two types, namely a flow pipeline type conductivity cell structure and a symmetrical electrode type conductivity cell structure. The electrodes of the flow pipeline type are distributed in the sealed flow guide pipe, so that the constant of the conductance cell cannot be changed, and the size of the conductance cell is large and is difficult to process; the symmetrical electrode type conductivity cell consists of a plurality of groups of symmetrical polar plates, a plurality of groups of electrodes can be arranged on each polar plate, the constant of the conductivity cell is positively correlated with the distance between the polar plates, and once the distance is determined, the constant of the conductivity cell cannot be changed.
As shown in fig. 1, the four-electrode conductivity sensor has a plate shape. The conductivity cell of the conductivity sensor consists of two groups of circular ring electrodes which are arranged in parallel and symmetrically on the electrode plates, the circular ring electrodes are composed of platinum film electrodes, a platinum wire lead wire is embedded in the electrode plate corresponding to each electrode, and the lead wire is led out from a leading-out end on the electrode plate.
The conductivity cell of the traditional electrode type conductivity sensor is only one, when the wide-range quick response measurement and the small-range high-precision measurement are switched, the conductivity cell probes with different electrode constants need to be replaced, the stability of signal output of the sensor is influenced, and meanwhile, the replacement is inconvenient.
Disclosure of Invention
The invention aims to solve the problems that when the traditional electrode type conductivity sensor is used for switching the large range and the small range, a conductivity cell probe needs to be replaced and the stability of signal output of the sensor is poor, and provides a double-cell conductivity sensor sharing an intermediate electrode plate and a preparation method thereof.
A double-cell conductivity sensor sharing an intermediate electrode plate comprises a conductivity sensor core body and a shell, wherein the conductivity sensor core body is embedded in the shell,
the conductivity sensor core body comprises three electrode plates which are parallel to each other and are arranged in a stacked mode, electrode groups are arranged on two sides of the electrode plate in the middle, the electrode groups on the two sides are arranged in a mirror symmetry mode, the electrode groups are arranged on one side of the electrode plate on the two sides, the electrode groups on the electrode plates on the two sides are opposite to the electrode groups on the electrode plate in the middle, and the electrode groups comprise current electrodes and voltage electrodes.
Further, the ratio of the distance between the electrode plate positioned in the middle and the two electrode plates positioned at the outer side is 2 to 4.
Furthermore, the current electrode is annular, the voltage electrode is circular, and the voltage electrode is positioned in the current electrode ring and concentric with the current electrode ring.
Further, the double-cell conductivity sensor sharing the middle electrode plate further comprises a signal conversion circuit, wherein the signal conversion circuit is positioned in the shell, the signal input end of the signal conversion circuit is connected with the signal output ends of the current electrode and the voltage electrode, and the signal output end of the signal conversion circuit is connected with the signal input end of the external signal acquisition device.
Furthermore, both sides of the electrode plate positioned in the middle are provided with leading-out ends, and one side of the electrode plate positioned at both sides is provided with the leading-out ends.
Furthermore, the conductivity sensor core body is in sealing connection with the shell through the sealing rubber ring, and elastic sealing grease is filled between the conductivity sensor core body and the shell.
Further, the electrode plate is a ceramic casting sheet.
Further, the current electrode and the voltage electrode are both platinum film electrodes.
The preparation method of the double-cell conductivity sensor sharing the middle electrode plate comprises the following steps:
step one: preparing three layers of ceramic casting sheets to form three layers of electrode plates,
step two: the punching technology is adopted to prepare through holes on the three layers of electrode plates respectively,
step three: platinum film leads are respectively prepared in the through holes of the electrode plates by adopting a screen printing mode,
step four: preparing current electrodes and voltage electrodes on two sides of one electrode plate by adopting a screen printing mode, preparing current electrodes and voltage electrodes on one side of the other two electrode plates, connecting the current electrodes and the voltage electrodes with one end of a platinum film lead,
step five: the three electrode plates are mutually parallel and overlapped to form a conductivity sensor core body, the conductivity sensor core body is placed in the shell, the current electrode and the voltage electrode on the electrode plates positioned at two sides are mutually opposite to the current electrode and the voltage electrode on the electrode plate positioned in the middle, the distance ratio between the electrode plate positioned in the middle and the two electrode plates positioned at the outer side is 2 to 4,
step six: the conductivity sensor core is sintered and formed at 1450 ℃.
The invention reduces four electrode plates of the two conductivity cells to three electrode plates, and the middle electrode plate is shared by the two conductivity cells, so that the whole volume of the sensor is reduced to half of the original volume. The sensor has reduced the trouble of having saved the change conductivity cell simultaneously, can not cause the loss of sensor test signal. The double-conductivity cell conductivity sensor sharing the middle electrode plate is simple in structure and small in size, and can be matched with double-conductivity cell conductivity cores with various conductivity cell constants by adjusting the distances between the electrode plates on two sides and the middle electrode plate in practical application, so that the seawater conductivity detection with different measuring ranges and different precision requirements can be realized by the same conductivity core.
Drawings
FIG. 1 is a schematic diagram of a four-electrode conductivity sensor in the prior art;
FIG. 2 is a schematic three-dimensional structure of a dual cell conductivity sensor sharing an intermediate electrode plate according to the present invention;
FIG. 3 is a cross-sectional view of a dual cell conductivity sensor sharing an intermediate electrode plate according to the present invention;
FIG. 4 is a schematic plan view of an electrode plate;
fig. 5 is a schematic diagram of the overall assembly structure of a dual-cell conductivity sensor sharing an intermediate electrode plate according to the present invention.
Detailed Description
The first embodiment is as follows: referring to fig. 2 to 5, a dual cell conductivity sensor sharing an intermediate electrode plate according to the present embodiment includes a conductivity sensor core 1, a housing 2, and a signal conversion circuit, wherein the conductivity sensor core 1 is embedded in the housing 2.
The conductivity sensor core 1 comprises three electrode plates which are parallel to each other and are arranged in a laminated manner, and the electrode plates are ceramic casting sheets.
The electrode groups are arranged on two sides of the middle electrode plate and are arranged in a mirror symmetry mode, the electrode groups are arranged on one side of the electrode plate on two sides, the electrode groups on the electrode plate on two sides and the electrode groups on the middle electrode plate are opposite to each other, and the distance ratio between the electrode plate on the middle and the two electrode plates on the outer side is 2-4. The current electrode is annular, the voltage electrode is circular, and the voltage electrode is positioned in the current electrode ring and concentric with the current electrode ring.
The electrode group comprises a current electrode and a voltage electrode, and the current electrode and the voltage electrode are platinum film electrodes.
The signal conversion circuit is positioned in the shell 2, the signal input end of the signal conversion circuit is connected with the signal output ends of the current electrode and the voltage electrode, and the signal output end of the signal conversion circuit is connected with the signal input end of the external signal acquisition device.
The two sides of the electrode plate positioned in the middle are provided with leading-out ends, and the single side of the electrode plate positioned at the two sides is provided with the leading-out ends.
The conductivity sensor core body 1 is in sealing connection with the shell 2 through a sealing rubber ring, and elastic sealing grease is filled in the conductivity sensor core body 1 and the shell 2.
The electrode plate far from the middle electrode plate and the middle electrode plate form a wide-range conductive pool, the electrode plate near the distance and the middle electrode plate form a small-range conductive pool, two pairs of current electrodes and two pairs of voltage electrodes are arranged on the two sides of the middle electrode plate and the inner sides of the two electrode plates on the outer sides, four pairs of eight platinum film electrodes are connected with a platinum film lead wire buried in the electrode plate, and the other end of the platinum film lead wire is welded with a copper lead wire connected with a signal conversion circuit in a sensor shell. The conductivity sensor core body 1 is connected and sealed with the shell through the sealing rubber ring, and elastic sealing grease is filled in a gap in the core body, so that the sealing performance of the joint is improved. The signal conversion circuit is sealed on a circuit board in the pressure-resistant watertight housing and is connected with a signal collector outside the sensor through a cable.
The second embodiment is as follows: the preparation method of the double-cell conductivity sensor sharing the middle electrode plate, disclosed by the embodiment, comprises the following steps of:
step one: preparing three layers of ceramic casting sheets to form three layers of electrode plates,
step two: the punching technology is adopted to prepare through holes on the three layers of electrode plates respectively,
step three: platinum film leads are respectively prepared in the through holes of the electrode plates by adopting a screen printing mode,
step four: preparing current electrodes and voltage electrodes on two sides of one electrode plate by adopting a screen printing mode, preparing current electrodes and voltage electrodes on one side of the other two electrode plates, connecting the current electrodes and the voltage electrodes with one end of a platinum film lead,
step five: the three layers of electrode plates are mutually parallel and overlapped to form a conductivity sensor core body 1, the conductivity sensor core body 1 is placed in the shell 2, the current electrode and the voltage electrode on the electrode plates positioned at two sides are mutually opposite to the current electrode and the voltage electrode on the electrode plate positioned in the middle, the distance ratio between the electrode plate positioned in the middle and the two electrode plates positioned at the outer side is 2 to 4,
step six: the conductivity sensor core 1 was sintered at 1450 ℃.
When the embodiment is used for measuring the conductivity of seawater, the seawater to be measured passes through the conductivity cell, excitation current from the signal conversion circuit is fed into the conductivity cell from the middle polar plate and respectively flows to the induction electrodes at the two sides of the middle polar plate, an electric field is established in a medium to generate induction voltage, and the conductivity of the water sample to be measured is obtained by detecting voltage drop signals between a group of voltage electrodes.
The method is designed and prepared based on the ceramic co-firing process technology, the preparation process is mature, the batch production of the sensor is easy to realize, and the batch consistency and the repeatability are improved.
Claims (7)
1. The preparation method of the double-cell conductivity sensor sharing the middle electrode plate comprises a conductivity sensor core body (1) and a shell (2), wherein the conductivity sensor core body (1) is embedded in the shell (2), the conductivity sensor core body (1) comprises three electrode plates which are parallel to each other and are arranged in a stacking mode, electrode groups are arranged on two sides of the middle electrode plate and are arranged in a mirror symmetry mode, electrode groups are arranged on one side of the electrode plate on two sides, the electrode groups on the electrode plate on two sides are opposite to the electrode groups on the electrode plate on the middle electrode plate, and the electrode groups comprise current electrodes and voltage electrodes; the ratio of the distance between the electrode plate positioned in the middle and the two electrode plates positioned at the outer side is 2 to 4, and the preparation method is characterized by comprising the following steps:
step one: preparing three layers of ceramic casting sheets to form three layers of electrode plates,
step two: the punching technology is adopted to prepare through holes on the three layers of electrode plates respectively,
step three: platinum film leads are respectively prepared in the through holes of the electrode plates by adopting a screen printing mode,
step four: preparing current electrodes and voltage electrodes on two sides of the middle electrode plate by adopting a screen printing mode, preparing current electrodes and voltage electrodes on one side of the other two electrode plates, connecting the current electrodes and the voltage electrodes with one end of a platinum film lead,
step five: the three layers of electrode plates are mutually parallel and overlapped to form a conductivity sensor core body (1), the conductivity sensor core body (1) is placed in the shell (2), the current electrode and the voltage electrode on the electrode plates positioned at two sides are mutually opposite to the current electrode and the voltage electrode on the electrode plate positioned in the middle, the ratio of the distance between the electrode plate positioned in the middle and the two electrode plates positioned at the outer side is 2 to 4,
step six: the conductivity sensor core (1) is sintered and formed at 1450 ℃.
2. The method for manufacturing a dual cell conductivity sensor sharing an intermediate electrode plate according to claim 1,
the current electrode is annular, the voltage electrode is circular, and the voltage electrode is positioned in the current electrode ring and concentric with the current electrode ring.
3. The method for manufacturing a double-cell conductivity sensor sharing an intermediate electrode plate according to claim 2, further comprising a signal conversion circuit, wherein the signal conversion circuit is located inside the housing (2), a signal input end of the signal conversion circuit is connected to signal output ends of the current electrode and the voltage electrode, and a signal output end of the signal conversion circuit is connected to a signal input end of an external signal acquisition device.
4. The method for manufacturing a dual cell conductivity sensor sharing an intermediate electrode plate according to claim 2, wherein,
the two sides of the electrode plate positioned in the middle are provided with leading-out ends, and the single side of the electrode plate positioned at the two sides is provided with the leading-out ends.
5. The method for manufacturing a dual cell conductivity sensor sharing an intermediate electrode plate according to claim 2, wherein,
the conductivity sensor core body (1) is connected with the shell (2) in a sealing way through a sealing rubber ring,
the conductivity sensor core body (1) and the shell body (2) are also filled with elastic sealing grease.
6. The method for manufacturing a double-cell conductivity sensor sharing an intermediate electrode plate according to claim 2, wherein the electrode plate is a ceramic casting sheet.
7. The method for manufacturing a dual cell conductivity sensor sharing an intermediate electrode plate according to claim 2, wherein,
the current electrode and the voltage electrode are both platinum film electrodes.
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