High-precision and high-sensitivity humidity test platform building method

Abstract

The invention belongs to the technical field of performance testing, and discloses a building method of a humidity testing platform with high precision and high sensitivity. According to the method, a humidity testing platform is built by adopting a split-flow method, in a pipeline, dry gas becomes wet gas through a gas flow meter and a wetting tank, the dry gas does not change after passing through the gas flow meter, the dry gas and the wet gas are mixed and pass through a testing cavity and a dew-point meter, the dew-point meter measures the real-time humidity of the mixed gas, and a testing sample is placed in the cavity. And the digital bridge displays the electrical parameters of the sample. The structure is simple, operation is flexible, and the humidity can be dynamically adjusted; the stainless steel pipeline is used, so that the air tightness and the corrosion resistance are more excellent; according to the invention, the test cavity is subjected to special treatment, so that the air tightness is ensured, and the electrical insulation is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of performance testing, and particularly relates to a method for building a humidity testing platform with high precision and high sensitivity. Background Art

[0002] Humidity is a physical quantity representing the water vapor content in a gas. In different theoretical and application environments, humidity values can be described in terms of relative humidity, absolute humidity, dew point temperature, volume ratio, etc. There are precise control requirements for humidity in industries such as industrial manufacturing, meteorological research, and national defense.

[0003] A humidity sensor is a precision instrument for realizing humidity measurement. Among them, the capacitive humidity sensor is the most widely used at present, with the advantages of low cost, high precision, and portability, and has good development prospects. The humidity-sensitive core of the capacitive humidity sensor is the internal humidity-sensitive material, which can be divided into ceramic materials represented by alumina, polymer materials represented by polyimide, semiconductor materials represented by metal oxides, etc. The conversion of humidity magnitude into capacitance value is achieved by the material adsorbing water molecules and affecting the dielectric constant of the material itself. The conversion of humidity magnitude into resistance value is achieved by the hydrogen ions generated by the ionization of the material adsorbing water molecules participating in conduction, thereby changing the carrier mobility to characterize the humidity magnitude.

[0004] The humidity-sensitive element of the sensor is prepared through a manufacturing process. To detect the specific humidity-sensitive ability, the humidity performance is tested at different humidities. Different humidity environments are provided by a humidity generating device. The mainstream humidity generating devices include a saturated salt solution method humidity generator, a dual-pressure method humidity generator, a dual-temperature method humidity generator, a permeation method humidity generator, and a shunt method humidity generator. The shunt method humidity generator mixes dry gas and wet gas in a certain proportion to generate a gas with a constant humidity, can realize the dynamic adjustment of humidity magnitude, and has a simple structure and flexible operation. Summary of the Invention

[0005] The purpose of the present invention is to improve the deficiencies of the existing humidity testing platform and provide a method for building a humidity testing platform with high precision and high sensitivity.

[0006] To achieve the above technical objectives, the present invention provides a method for building a humidity testing platform with high precision and high sensitivity. The built humidity testing platform includes a pipeline, a gas sleeve connected to the pipeline, a gas flowmeter connected to the pipeline, a wetting tank connected to the pipeline, a test cavity connected to the pipeline, a dew point meter connected to the pipeline, and a digital bridge connected to the lead wire led out from the test cavity.

[0007] In the method for building a humidity testing platform with high precision and high sensitivity, the materials of each section of the pipeline are all 304 stainless steel.

[0008] The described method for building a humidity test platform with high precision and high sensitivity uses gas sleeves for connections between pipelines and between pipelines and instruments, and the material of the gas sleeves is 304 stainless steel.

[0009] The described method for building a humidity test platform with high precision and high sensitivity has gas flow measurement ranges of 10 - 100 mL / min and 6 - 60 mL / min respectively.

[0010] The described method for building a humidity test platform with high precision and high sensitivity has a wetting tank which is a liquid container containing only an air inlet and an air outlet.

[0011] Further, the stainless - steel pipeline is connected to the gas outlet pipeline, both with a size of 0.25 inch, and connected using a ferrule.

[0012] Further, the pipeline is connected to a tee ferrule, dividing the pipeline into two branches. The sizes of the branch pipelines are both 0.25 inch, and they are respectively connected to gas flow meters and connected using ferrules.

[0013] Further, a pipeline is led out from the branch of the gas flow meter with a range of 10 - 100 mL / min and connected to the wetting tank. The inner diameter of the pipeline is 16 mm, and it is connected using a ferrule.

[0014] Further, a pipeline is led out from the air outlet of the wetting tank. The inner diameter of the pipeline is 16 mm, and it is connected using a ferrule.

[0015] Further, a pipeline is led out from the branch of the gas flow meter with a range of 6 - 60 mL / min. The inner diameter of the pipeline is 16 mm, and the two branches are connected using a tee ferrule.

[0016] Further, the combined pipeline is led out and connected to the test cavity. A pipeline is led out from the other side of the cavity. The inner diameters of the two pipelines are both 16 mm and they are connected using ferrules.

[0017] Further, the inner diameter size of the pipeline is shortened. Through two reducing ferrules connections, the pipeline with an inner diameter of 16 mm is shortened to 0.125 inch.

[0018] Further, the pipeline is connected to a dew - point meter and connected using a ferrule.

[0019] Further, the wire led out from the test cavity itself is connected to a digital bridge.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention adopts a shunt - type humidity generator. The dry gas is mixed with the wet gas to obtain a precise and constant humidity gas environment. It has a simple structure and flexible operation. Adopting a closed - loop control system, it can detect the real - time humidity of the mixed gas, dynamically adjust the gas flow of each path, realize the continuous stability of the gas humidity, and meet the requirements of the humidity test platform.

[0022] The present invention uses stainless steel pipes, which have excellent low permeability, corrosion resistance, and better airtightness compared to polymer plastic pipes.

[0023] The special structure of the test cavity of the present invention ensures the airtightness of the cavity while leading out the lead wires, and the inside of the cavity is insulated to ensure electrical isolation from each other after the device under test is connected to the cavity, without affecting the test results. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a humidity test platform for a method of building a humidity test platform with high precision and high sensitivity described in the embodiments of the present invention.

[0025] Figure 2 It is a three-dimensional view of a humidity test platform for a method of building a humidity test platform with high precision and high sensitivity described in the embodiments of the present invention.

[0026] Figure 3 It is a top view of a humidity test platform for a method of building a humidity test platform with high precision and high sensitivity described in the embodiments of the present invention.

[0027] Figure 4 It is a schematic principle diagram of a humidity test platform for a method of building a humidity test platform with high precision and high sensitivity described in the embodiments of the present invention.

[0028] In the drawings, the list of components of the humidity test platform represented by each reference numeral is as follows:

[0029] 1. Pipe; 2. Gas flow meter; 3. Gas flow meter; 4. Humidifying tank; 5. Test cavity; 6. Dew point meter; 7. LCR digital bridge. Detailed Description of the Invention

[0030] The following clearly and completely describes in detail the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0031] A method of building a humidity test platform with high precision and high sensitivity. The humidity test platform built by the present invention includes pipe 1, a gas jacket connected to the pipe, a gas flow meter 2 connected to the pipe, a humidifying tank 4 connected to the pipe, a test cavity 5 connected to the pipe, a dew point meter 6 connected to the pipe, and a digital bridge 7 connected to the lead wires of the above test cavity.

[0032] Optionally, the material of each section of pipe 1 is 304 stainless steel.

[0033] Optionally, gas sleeves are used for connection between each pipeline and between the pipeline and the instrument, and the material of the gas sleeves is 304 stainless steel.

[0034] Optionally, the measuring range of the gas flowmeter 2 is 10 - 100 mL / min, and the measuring range of the gas flowmeter 3 is 6 - 60 mL / min.

[0035] Optionally, the wetting tank 4 is a liquid container that only includes an air inlet and an air outlet.

[0036] The stainless steel pipeline 1 is connected to the gas outlet pipeline, and their sizes are both 0.25 inch, and compression fittings are used for connection.

[0037] The pipeline 1 is connected to a three-way compression fitting, and the pipeline 1 is divided into two branch pipelines. The sizes of the branch pipelines are both 0.25 inch, and they are respectively connected to the gas flowmeter 2 and the gas flowmeter 3, and compression fittings are used for connection.

[0038] A branch of the gas flowmeter 2 leads out an L-shaped pipeline 1 with one end being 5 cm long, the other end being 5 cm long, and an inner diameter of 16 mm to the wetting tank 4, and compression fittings are used for connection.

[0039] A pipeline 1 with a length of 5 cm and an inner diameter of 16 mm is led out from the air outlet of the wetting tank 4, and compression fittings are used for connection.

[0040] A branch of the gas flowmeter 3 leads out an L-shaped pipeline 1 with one end being 5 cm long, the other end being 20 cm long, and an inner diameter of 16 mm, and a three-way compression fitting is used to connect the two branches.

[0041] After merging, a pipeline 1 with a length of 10 cm and an inner diameter of 16 mm is led out to connect to the test cavity 5, and a pipeline 1 with a length of 5 cm and an inner diameter of 16 mm is led out from the other side of the cavity, and compression fittings are used for connection.

[0042] A 90° reducing compression fitting is used to connect the pipeline 1 led out from the cavity and the pipeline 1 with a length of 5 cm and an inner diameter of 6 mm.

[0043] A reducing compression fitting is used to connect to a pipeline 1 with one end being 5 cm long and the other end being 10 cm long and a size of 0.125 inch.

[0044] The 0.125-inch pipeline is connected to the dew point meter 6, and compression fittings are used for connection.

[0045] The wire led out from the test cavity 5 itself is connected to the digital bridge 7.

[0046] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those of ordinary skill in the relevant technical field can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention, and the patent protection scope of the present invention shall be defined by the claims.

Claims

1. A method for constructing a humidity testing platform with high precision and high sensitivity, characterized in that: It includes a pipeline, a gas sleeve connected to the pipeline, a gas flow meter connected to the pipeline, a wetting tank connected to the pipeline, a test cavity connected to the pipeline, a dew point meter connected to the pipeline, and a digital bridge connected to the lead wires of the test cavity.

2. A method for constructing a humidity testing platform with high precision and high sensitivity according to claim 1, characterized in that The materials of each section of the pipeline are 304 stainless steel.

3. A method for constructing a humidity testing platform with high precision and high sensitivity according to claim 1, characterized in that Gas sleeves are used to connect the pipelines and the pipelines to the instruments, and the gas sleeves are made of 304 stainless steel.

4. A method for constructing a humidity testing platform with high precision and high sensitivity according to claim 1, characterized in that The gas flow meter ranges are 10-100 mL / min and 6-60 mL / min respectively.

5. A method for constructing a humidity testing platform with high precision and high sensitivity according to claim 1, characterized in that The moistening tank is a liquid container which only comprises an air inlet and an air outlet.

6. A method for constructing a humidity testing platform with high precision and high sensitivity according to any one of claims 1 to 4, characterized in that: The stainless steel pipe is connected to the gas outlet pipe, and the pipe is connected to the three-way ferrule to divide the pipe into two branches. The branch pipe size is 0.25 inches, and they are connected to the gas flow meter respectively, using a ferrule connection.

7. A method for constructing a humidity testing platform with high precision and high sensitivity according to any one of claims 1 to 5, characterized in that: The branch outlet pipe of the 10-100mL / min range gas flow meter is connected to the wet tank, and the inner diameter of the pipe is 16mm. The branch outlet pipe of the 6-60mL / min range gas flow meter has an inner diameter of 16mm and is connected and merged using a three-way ferrule.

8. A method for constructing a humidity testing platform with high precision and high sensitivity according to any one of claims 1 to 5, characterized in that: The air outlet of the moistening tank is connected to a pipe with an inner diameter of 16 mm and a ferrule connection.

9. A method for constructing a humidity testing platform with high precision and high sensitivity according to any one of claims 1 to 5, characterized in that: After merging, the pipeline is connected to the test chamber, and the pipeline is led out from the other side of the chamber. The inner diameter of the two pipelines is 16mm. Use a ferrule to connect them. The inner diameter of the pipeline is shortened. After two reducer ferrule connections, the inner diameter of the 16mm pipeline is shortened to 0.125 inches. The dew point meter is connected using a ferrule.

10. A method for constructing a humidity testing platform with high precision and high sensitivity according to any one of claims 1 to 5, characterized in that: The wires leading out of the test chamber itself are connected to the digital bridge.

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