Conductivity sensor probe and manufacturing method

Abstract

According to the conductivity probe combining the pressure sensor and the temperature sensor and the manufacturing method, inductive conductivity measurement is adopted, ocean pressure (depth) and temperature data are collected in real time and sent to the collection control module for signal processing and fitting, the inductive conductivity is high in measurement precision, high in response speed and free of a polarization phenomenon, and the measurement accuracy is high. And the device can adapt to different marine environments. The device is used for accurately measuring the conductivity in seawater and further converting the conductivity into salinity data, and key parameters are provided for marine environment monitoring and research.

Description

Technical Field

[0001] The invention belongs to the field of marine science and technology, and in particular relates to a conductivity sensor probe and a manufacturing method thereof. Background Art

[0002] As the largest ecosystem on Earth, the state of the ocean environment has a profound impact on global climate, ecological balance, and human activities. Accurate monitoring and analysis of ocean environmental parameters, especially seawater temperature, salinity, and depth, are of great significance for understanding ocean dynamics, predicting climate change, protecting marine resources, and conducting marine scientific research.

[0003] Traditional ocean temperature, salinity and depth measurement technology mainly relies on ship-borne CTD multi-parameter sensors, which indirectly calculate the salinity and depth of seawater by measuring the conductivity, temperature and pressure of seawater. However, traditional ship-borne CTD multi-parameter sensors have certain limitations in measurement accuracy, stability and adaptability to extreme marine environments.

[0004] Conventional marine CTD multi-parameter sensors are not equipped with pressure sensors. For example, the non-external inductive conductivity sensor disclosed in patent document CN1140349298B measures the temperature and salinity of the ocean, combines the known seawater state equation, estimates the density of the seawater, and then calculates the depth based on the water column method. This usually leads to deviations in the accuracy of the data.

[0005] In view of the deficiencies of the prior art, the present invention provides an improved inductive conductivity sensor, aiming to solve the above problems and improve the accuracy and efficiency of ocean temperature, salinity and depth measurements. Summary of the invention

[0006] In view of the defects in the prior art, an object of the present invention is to provide a conductivity sensor probe and a manufacturing method thereof.

[0007] A conductivity sensor probe provided by the present invention comprises: an excitation magnetic ring coil 1, an induction magnetic ring coil 2, a ceramic tube 3, a pressure sensor 6 and a temperature sensor 7;

[0008] The excitation magnetic ring coil 1 and the induction magnetic ring coil 2 are coaxial, and a ceramic tube 3 is set through the center, and is set together with the pressure sensor 6 and the temperature sensor 7 in the housing 8;

[0009] The ceramic tube 3 is provided with a pressure sensor water inlet hole 10 , and seawater enters through the pressure sensor water inlet hole 10 and contacts the pressure sensor 6 , and then is discharged through the seawater diversion hole 11 .

[0010] Preferably, a rubber gasket 5 is provided between the excitation magnetic ring coil 1 and the induction magnetic ring coil 2;

[0011] The induction magnetic ring coil 2 is covered with a shielding cover 4, and a grounding wire is welded on the shielding cover 4 and led to the upper part of the housing 8;

[0012] The excitation magnetic ring coil 1 , the rubber gasket 5 , the shielding cover 4 and the induction magnetic ring coil 2 are sequentially installed and sleeved on the ceramic tube 3 to form a whole, and are arranged concentrically with the housing 8 .

[0013] Preferably: the excitation magnetic ring coil 1 generates an alternating magnetic field after being connected to an AC power source, and can induce a current passing through the liquid in the ceramic tube 3;

[0014] The magnitude of the current detected by the induction magnetic ring coil 2 is proportional to the conductivity of the liquid. After amplification and digital processing, the conductivity value of the liquid is converted;

[0015] The pressure sensor 6 and the temperature sensor 7 are used to control the rated pressure and temperature changes of the compensation liquid respectively.

[0016] Preferably, the excitation magnetic ring coil 1 is a plurality of groups of enameled wires with uniform turn spacing, including a plurality of turns of feedback coils;

[0017] The induction magnetic ring coil 2 is a multi-turn enameled wire with uniform turn spacing, including a multi-turn feedback coil.

[0018] Preferably, the shell 8 is made of ABS material, and drainage holes communicating with the ceramic tube 3 are evenly arranged on the upper part; a flow guide cover 9 is arranged at the front part;

[0019] The ground wire of the shielding cover 4 , the exciting magnetic ring coil 1 , and the induction magnetic ring coil 2 are respectively welded to the wires with the shielding layer and led out from the wire outlet holes at the upper part of the housing 8 .

[0020] Preferably, the excitation magnetic ring coil 1 and the induction magnetic ring coil 2 are both made of nano-amorphous materials, the ceramic tube 3 is made of alumina ceramics, and the shielding cover 4 is made of Permalloy.

[0021] Preferably, the pressure sensor 6 is a diffused silicon piezoresistive pressure sensor with a radial sealing ring; the temperature sensor 7 is a wire-type platinum resistor.

[0022] Preferably, it is a disposable warm-salinity deep probe.

[0023] Preferably, the pressure sensor 6 is eccentrically arranged with respect to the ceramic tube 3 and is located in the static pressure zone or a zone close to the static pressure zone;

[0024] The diameter of the water inlet hole 10 of the pressure sensor is smaller than the diameter of the seawater diversion hole 11 .

[0025] A method for manufacturing a conductivity sensor probe provided by the present invention comprises the following steps:

[0026] Step 1: Wind the exciting magnetic ring coil 1 with enameled wire, wind multiple groups with even turn spacing, and then wind multiple turns of the feedback coil;

[0027] Step 2: Wind the induction magnetic ring coil 2 with enameled wire, wind multiple turns with uniform turn spacing, and then wind multiple turns of the feedback coil;

[0028] Step 3: After the excitation magnetic ring coil 1 and the induction magnetic ring coil 2 are wound, the outermost layer is first covered with PET insulating tape and then covered with copper foil shielding to reduce electromagnetic interference and noise;

[0029] Step 4: Install the excitation magnetic ring coil 1, the rubber gasket 5, the shielding cover 4 and the induction magnetic ring coil 2 in sequence and sleeve them onto the ceramic tube 3 to form a whole, which is arranged concentrically with the housing 8;

[0030] After the ceramic tube 3, the excitation magnetic ring coil 1 and the induction magnetic ring coil 2 are installed, a distance is left between the excitation magnetic ring coil and the induction magnetic ring coil at both ends;

[0031] A grounding wire is welded on the shielding cover 4 and led out to the upper part of the housing 8;

[0032] The ground wire of the shielding cover 4, the excitation magnetic ring coil 1, and the induction magnetic ring coil 2 are respectively welded with the Teflon single-core silver-plated wire with a shielding layer and led out from the wire outlet hole at the upper part of the housing 8. Before welding, each end is insulated by a heat shrink sleeve.

[0033] Step 5: The pressure sensor 6 and the temperature sensor 7 are installed in the slots of the housing 8 on the same plane as the ceramic tube 3;

[0034] Step 6: Pour the polyurethane potting glue 12 into the slots of the housing 8 and solidify it to seal it; then seal the ceramic tube 3 and the wire outlet holes at the upper end of the housing 8 with sludge or clay, and remove the polyurethane potting glue 12 after it is completely solidified.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The built-in high-precision pressure sensor can directly measure the water depth, which is more accurate than the traditional method of calculating the results based on empirical formulas.

[0037] 2. The addition of the pressure sensor allows the probe to independently complete depth measurement, without the need to calculate the depth based on the sinking time and speed. The system has fast response, good transmission quality, and strong anti-interference ability.

[0038] 3. The present invention has high measurement accuracy, fast response speed, no polarization phenomenon, and can adapt to different marine environments. It is used to accurately measure the conductivity in seawater and then convert it into salinity data, providing key parameters for marine environment monitoring and research. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0040] Figure 1 It is a schematic diagram of the working principle of the present invention;

[0041] Figure 2 It is a structural schematic diagram of the present invention;

[0042] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0043] Figure 4 The schematic diagram of the winding structure of the excitation magnetic ring coil;

[0044] Figure 5 Schematic diagram of the winding structure of the induction magnetic ring coil.

[0045] The figure shows:

[0046] DETAILED DESCRIPTION

[0047] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0048] A conductivity sensor probe provided by the present invention comprises a ceramic tube 3, an excitation magnetic ring coil 1, an induction magnetic ring coil 2, a rubber gasket 5, a shielding cover 4, a pressure sensor 6, a temperature sensor 7, a housing 8 and a lead. The excitation magnetic ring coil 1 is used as an excitation coil, and the induction magnetic ring coil 2 is used as an inductance coil.

[0049] Furthermore, the excitation magnetic ring coil 1 and the induction magnetic ring coil 2 are coaxially arranged and are encapsulated in the housing 8 together with the pressure sensor 6 and the temperature sensor 7. The excitation magnetic ring coil 1 and the induction magnetic ring coil 2 are both nano-amorphous magnetic rings.

[0050] Furthermore, the ceramic tube 3 is used as an axis and penetrates the center of the excitation magnetic ring coil 1 and the induction magnetic ring coil 2. The ceramic tube 3 is made of alumina ceramic, which is resistant to seawater corrosion and has relatively stable physical and chemical properties. Its function is to guide seawater.

[0051] Furthermore, the induction magnetic ring coil 2 is wrapped by the shielding cover 4. The shielding cover 4 is made of 1J85 Permalloy.

[0052] Furthermore, the rubber gasket 5 is sandwiched between the excitation magnetic ring coil 1 and the induction magnetic ring coil 2 to play the role of insulation, shock absorption and positioning.

[0053] Furthermore, the pressure sensor 6 is a diffused silicon piezoresistive pressure sensor with a radial sealing ring.

[0054] Furthermore, the temperature sensor 7 is a wire-type platinum resistor.

[0055] Furthermore, the lead wire is welded to the outgoing wires of the excitation magnetic ring coil 1 and the induction magnetic ring coil 2, and a Teflon single-core silver-plated wire with a shielding layer is used.

[0056] Furthermore, the shell 8 is made of ABS material, and drainage holes communicating with the ceramic tube 3 are evenly arranged on the upper part. The excitation magnetic ring coil 1 and the induction magnetic ring coil 2 are coaxially arranged and then concentrically arranged with the center of the shell 8.

[0057] The present invention will be described in more detail below with reference to preferred examples.

[0058] like Figure 1 As shown, the working principle of the present invention is: the excitation magnetic ring coil 1 is connected to an AC power supply to generate an alternating magnetic field to induce a current passing through the liquid in the ceramic tube 3. The magnitude of the current detected by the induction magnetic ring coil 2 is proportional to the conductivity of the liquid. After amplification and digital processing, the conductivity value of the liquid is converted, and the pressure sensor 6 and the temperature sensor 7 are respectively used to control and compensate for the rated pressure and temperature changes of the liquid to ensure the accuracy and reliability of the measurement results.

[0059] Among them, the pressure sensor 6 measures the depth of the probe in the water in real time. Therefore, the pressure sensor 6 must be arranged in a place where it can contact the water and is close to the hydrostatic pressure area, that is, the detection surface of the pressure sensor 6 cannot be directly on the upstream surface, otherwise dynamic pressure will be generated, resulting in inaccurate depth data of the detection. The pressure sensor 6 cannot be arranged in the negative pressure area. If it is coaxially arranged with the tube hole of the conductivity ceramic tube 3, that is, in the negative pressure area, bubbles will generate cavitation, resulting in inaccurate measurement data. Therefore, the position of the pressure sensor 6 is the static pressure area or the nearly static pressure area after simulation, that is, close to the hydrostatic pressure area.

[0060] The diameter of the water inlet hole 10 of the pressure sensor is smaller than the diameter of the seawater diversion hole 11. The purpose is:

[0061] A. Preventing blockage and protecting the sensor: A smaller aperture of the pressure sensor water inlet hole 10 can reduce the chance of suspended particles and organisms in the water entering the pressure sensor 6, thereby protecting the pressure sensor 6 from blockage and damage.

[0062] B. Improving conductivity measurement accuracy: Conductivity measurement requires a larger aperture to ensure sufficient seawater flow to obtain accurate conductivity readings. A larger aperture of the seawater diversion hole 11 helps the seawater fully contact the conductivity sensor, thereby improving the accuracy of the measurement.

[0063] C. Flow field uniformity: According to the principles of fluid mechanics, the size and shape of the aperture have a significant impact on the uniformity of the flow field. Larger conductivity holes can better distribute the flow field, reduce turbulence and eddies, and thus improve measurement stability.

[0064] D. Response speed and sensitivity: A smaller aperture of the water inlet hole 10 of the pressure sensor may mean a faster response speed, because a smaller aperture requires a smaller volume change to cause a pressure change, which can improve the sensitivity of the pressure sensor.

[0065] E. Structural strength and reliability: A smaller hole diameter of the pressure sensor water inlet hole 10 may help maintain the structural strength of the probe because a smaller hole diameter means less material is removed, which may improve the overall reliability of the probe.

[0066] like Figure 2 As shown, the front part of the housing 8 is a guide cover 9, and the pressure sensor 6 is installed inside the housing 8. Seawater enters the contact pressure sensor 6 through the water inlet hole of the pressure sensor 6. Seawater enters through the ceramic tube 3 and is discharged through the seawater guide hole 11.

[0067] like Figure 3 As shown, the excitation magnetic ring coil 1, rubber gasket 5, shielding cover 4 and induction magnetic ring coil 2 are sequentially installed and sleeved on the ceramic tube 3 to form a whole, and are arranged concentrically with the shell 8.

[0068] Furthermore, the ceramic tube 3 has a total length of 35 mm, an inner diameter of the hole of 8 mm, and an outer diameter of 12 mm. After being installed with the excitation magnetic ring coil 1 and the induction magnetic ring coil 2, a distance of 4 mm is left between the upper and lower ends.

[0069] Furthermore, the excitation magnetic ring coil 1 and the induction magnetic ring coil 2 are both made of nano-amorphous materials, and have dimensions of 16 mm inner diameter×21 mm outer diameter×10 mm high.

[0070] Furthermore, a grounding wire is welded on the shielding cover 4 and led out to the upper part of the housing 8, which can effectively suppress electromagnetic interference and ensure the integrity of the signal output and the stability of the sensor system.

[0071] Furthermore, the pressure sensor 6 and the temperature sensor 7 are installed in the slots of the housing 8 and are on the same plane as the ceramic tube 3 .

[0072] Furthermore, after the pressure sensor 6 and the temperature sensor 7 are installed, the polyurethane potting glue 12 is poured into the slot of the housing 8 and cured and potted. Then, the ceramic tube 3 and the outlet holes at the upper end of the housing 8 are sealed with sludge or clay, and the polyurethane potting glue 12 is removed after it is completely cured.

[0073] like Figure 4 As shown, the excitation magnetic ring coil 1 is wound with 0.4mm diameter enameled wire, with a turn spacing of 1mm, and 60 turns are wound in groups of 10 turns. Then 6 turns of feedback coil are wound. The advantage of this winding is that better signal separation and transmission can be achieved. The input end receives the excitation signal, while the feedback end is used to detect the current change inside the sensor and convert it into an electrical signal. At the same time, interference is reduced, measurement accuracy is improved, and circuit efficiency and stability are optimized.

[0074] like Figure 5 As shown, the induction magnetic ring coil 2 is wound with 0.2mm diameter enameled wire, and 110 turns are evenly wound with a turn spacing of 1mm. Then 10 turns of feedback coil are wound. The advantage of this winding is that differential output can be achieved, that is, by comparing the output signals of the main winding and the feedback winding, common mode noise and interference signals can be eliminated, further improving the stability and accuracy of the measurement.

[0075] Furthermore, the outlet ends of the excitation magnetic ring coil 1 and the induction magnetic ring coil 2 are as short as possible, as long as they can be welded with the Teflon single-core silver-plated wire with a shielding layer and led out from the upper outlet hole of the shell 8. Before welding, each end is insulated by a heat shrink tubing.

[0076] Furthermore, after the excitation magnetic ring coil 1 and the induction magnetic ring coil 2 are wound, the outermost layer is firstly coated with PET insulating tape and then coated with 3 layers of copper foil shielding to reduce electromagnetic interference and noise.

[0077] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0078] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A conductivity sensor probe, characterized in that: include: An excitation magnetic ring coil (1), an induction magnetic ring coil (2), a ceramic tube (3), a pressure sensor (6) and a temperature sensor (7); The excitation magnetic ring coil (1) and the induction magnetic ring coil (2) are coaxial, and a ceramic tube (3) is provided through the center thereof, and is arranged inside a housing (8) together with the pressure sensor (6) and the temperature sensor (7); The ceramic tube (3) is provided with a pressure sensor water inlet hole (10), and seawater enters through the pressure sensor water inlet hole (10) and contacts the pressure sensor (6), and is then discharged through the seawater diversion hole (11).

2. The conductivity sensor probe according to claim 1, characterized in that: A rubber gasket (5) is provided between the excitation magnetic ring coil (1) and the induction magnetic ring coil (2); The induction magnetic ring coil (2) is covered with a shielding cover (4) on the outside, and a grounding wire is welded on the shielding cover (4) and led to the upper part of the housing (8); The excitation magnetic ring coil (1), the rubber gasket (5), the shielding cover (4) and the induction magnetic ring coil (2) are sequentially installed and sleeved on the ceramic tube (3) to form a whole, and are arranged concentrically with the outer shell (8).

3. The conductivity sensor probe according to claim 1, characterized in that: The excitation magnetic ring coil (1) generates an alternating magnetic field after being connected to an AC power source, and is capable of inducing an electric current passing through the liquid in the ceramic tube (3); The magnitude of the current detected by the induction magnetic ring coil (2) is proportional to the conductivity of the liquid. After amplification and digital processing, the conductivity value of the liquid is converted; The pressure sensor (6) and the temperature sensor (7) are used to control the rated pressure and temperature changes of the compensation liquid respectively.

4. The conductivity sensor probe according to claim 1, characterized in that: The exciting magnetic ring coil (1) is a plurality of groups of enameled wires with uniform turn spacing, including a plurality of turns of feedback coil; The induction magnetic ring coil (2) is a multi-turn enameled wire with uniform turn spacing, and comprises a multi-turn feedback coil.

5. The conductivity sensor probe according to claim 2, characterized in that: The shell (8) is made of ABS material, and drainage holes connected to the ceramic tube (3) are evenly arranged on the upper part; a flow guide cover (9) is arranged at the front part; The grounding wire of the shielding cover (4), the exciting magnetic ring coil (1) and the induction magnetic ring coil (2) are respectively welded to the wire with the shielding layer and led out from the wire outlet hole at the upper part of the shell (8).

6. The conductivity sensor probe according to claim 2, characterized in that: The exciting magnetic ring coil (1) and the inductive magnetic ring coil (2) are both made of nano-amorphous materials, the ceramic tube (3) is made of alumina ceramics, and the shielding cover (4) is made of Permalloy.

7. The conductivity sensor probe according to claim 1, characterized in that: The pressure sensor (6) is a diffused silicon piezoresistive pressure sensor with a radial sealing ring; the temperature sensor (7) is a wire-type platinum resistor.

8. The conductivity sensor probe according to claim 1, characterized in that: It is a disposable temperature-salinity deep probe.

9. The conductivity sensor probe according to claim 1, characterized in that: The pressure sensor (6) is eccentrically arranged with respect to the ceramic tube (3) and is located in a static pressure zone or a zone close to the static pressure zone; The diameter of the water inlet hole (10) of the pressure sensor is smaller than the diameter of the seawater diversion hole (11).

10. A method for manufacturing a conductivity sensor probe, characterized in that: The following steps are involved: Step 1: Winding the exciting magnetic ring coil (1) with enameled wire, winding multiple groups with even turn spacing, and then winding multiple turns of the feedback coil; Step 2: Winding the induction magnetic ring coil (2) with enameled wire, winding multiple turns with uniform turn spacing, and then winding multiple turns of the feedback coil; Step 3: After the excitation magnetic ring coil (1) and the induction magnetic ring coil (2) are wound, the outermost layer is firstly coated with PET insulating tape and then with copper foil shielding to reduce electromagnetic interference and noise; Step 4: The excitation magnetic ring coil (1), the rubber gasket (5), the shielding cover (4) and the induction magnetic ring coil (2) are sequentially installed and sleeved on the ceramic tube (3) to form a whole, and arranged concentrically with the outer shell (8); After the ceramic tube (3) and the excitation magnetic ring coil (1) and the induction magnetic ring coil (2) are installed, a distance is left between the excitation magnetic ring coil and the induction magnetic ring coil at both the upper and lower ends; A grounding wire is welded on the shielding cover (4) and led out to the upper part of the housing (8); The ground wire, the excitation magnetic ring coil (1) and the induction magnetic ring coil (2) of the shielding cover (4) are respectively welded to a Teflon single-core silver-plated wire with a shielding layer and led out from the wire outlet hole at the upper part of the housing (8). Before welding, each end is sheathed in a heat shrink tubing for insulation. Step 5: The pressure sensor (6) and the temperature sensor (7) are installed in the slots of the housing (8) on the same plane as the ceramic tube (3); Step 6: Pour the polyurethane potting glue (12) into the slots of the housing (8) and solidify it to form a potting seal; then seal the ceramic tube (3) and the wire outlet holes at the upper end of the housing (8) with sludge or clay, and remove the polyurethane potting glue (12) after it is completely solidified.

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