KR101284401B1

KR101284401B1 - Gas sensor assembly

Info

Publication number: KR101284401B1
Application number: KR1020100057991A
Authority: KR
Inventors: 고종수; 조동진
Original assignee: 부산대학교 산학협력단
Priority date: 2010-06-18
Filing date: 2010-06-18
Publication date: 2013-07-09
Also published as: KR20110137953A

Abstract

The present invention relates to a gas sensor assembly for measuring the concentration of fine gas in water, and more particularly, by installing a gas sensor inside the fine mesh structure using a fine mesh structure that allows gas to pass but does not pass liquid. The present invention relates to a gas sensor assembly capable of measuring the concentration of a particular gas contained therein.
The gas sensor assembly for measuring the concentration of fine gas in water according to the present invention includes a fine mesh structure, a gas sensor, a main body, and lifting means. The micromesh structure includes a micromesh in which a plurality of through holes penetrated to the receiving portion are formed so as to form a receiving portion therein and allow gas to pass through but not a liquid. The gas sensor is accommodated in the receiving portion of the fine mesh structure. The main body includes a processor for receiving a signal from the gas sensor and calculating a concentration of the gas measured by the gas sensor, and a display unit for displaying a value calculated by the processor. The elevating means is elevating the fine mesh structure.

Description

Gas sensor assembly

The present invention relates to a gas sensor assembly for measuring the concentration of fine gas in water, and more particularly, by installing a gas sensor inside the fine mesh structure using a fine mesh structure that allows gas to pass but does not pass liquid. The present invention relates to a gas sensor assembly capable of measuring the concentration of a particular gas contained therein.

In order to test the contamination of the river, it is determined by measuring the concentration of a specific gas such as dissolved oxygen or carbon dioxide. In this case, conventionally, the concentration of a specific gas contained in the river could not be measured in real time. Thus, in the prior art, a sample of a river to be measured was put in a sample container and then moved to a laboratory to measure the concentration of a specific gas contained in water in the laboratory.

In this case, the concentration of the gas contained in the sample is changed by contacting the outside air when the sample of the river is put in the sample container and raised, and the concentration of the gas contained in the sample is changed by the temperature change of the sample during transfer to the laboratory. . Therefore, there is a problem that the concentration of the gas contained in the sample transferred to the laboratory is different from the concentration of the gas contained in the actual river water. In other words, since it is difficult to measure the concentration of gas directly in water, it is difficult to implement a technique for accurately measuring the concentration of gas in real time.

The present invention is intended to solve the above problems. An object of the present invention is to provide a gas sensor assembly capable of measuring the concentration of the gas contained in the water directly in the water.

In addition, an object of the present invention is to provide a gas sensor assembly capable of measuring the concentration of the gas contained in the water in real time.

The gas sensor assembly for measuring the concentration of fine gas in water according to the present invention includes a fine mesh structure, a gas sensor, a main body, and elevating means. The micromesh structure includes a micromesh in which a plurality of through holes penetrated to the receiving portion are formed so as to form a receiving portion therein and allow gas to pass through but not a liquid. Here, the fine mesh is preferably coated with a water repellent material or a water repellent material so that water does not penetrate. The gas sensor is accommodated in the receiving portion of the fine mesh structure. The main body includes a processor for receiving a signal from the gas sensor and calculating a concentration of the gas measured by the gas sensor, and a display unit for displaying a value calculated by the processor. The elevating means is elevating the fine mesh structure.

The gas sensor assembly may further include an air compressor, an air line, and an air valve. The air compressor is installed in the main body. The air line supplies the compressed air of the air compressor to the receiving portion of the fine mesh structure. The air valve is installed in the receiving portion to open and close the air line.

In addition, in the gas sensor assembly, the lifting means is preferably provided with a scale for measuring the length of the fine mesh structure is lowered.

In addition, the gas sensor assembly preferably further comprises an air flowr installed in the receiving portion to create an air flow to evenly distribute the gas introduced into the through hole in the receiving portion.

In addition, the gas sensor assembly preferably further comprises a position tracker installed in the receiving portion for transmitting the position of the fine mesh structure.

In addition, in the gas sensor assembly, it is preferable that the micromesh structure is elastically shrunk so as to increase the pressure inside the accommodating part by water pressure when inserted into the water.

The gas sensor assembly may further include a first wireless communication unit and a second wireless communication unit. The first wireless communication unit is installed in the accommodating unit to transmit data such as the gas sensor in the micro mesh structure. The second wireless communication unit is installed in the main body to receive data and the like from the first wireless communication unit.

In addition, in the gas sensor assembly, the fine mesh structure is preferably composed of a part of the flexible elastic plate so that the inside of the receiving portion can be contracted by the hydraulic pressure.

In addition, in the gas sensor assembly, the fine mesh structure is preferably a nanostructure formed on the outer surface.

According to the present invention, the concentration of the gas contained in the water can be measured directly by installing a gas sensor inside the fine mesh structure that allows gas to pass but does not pass liquid. Therefore, accurate measurement is possible because the measurement is performed in the field without having to go to the laboratory to measure the concentration of a specific gas in the water. In addition, the gas is measured but prevents the penetration of water, so it can be used in the environmental monitoring gas detection system in the rain and snowy roads and outdoors, and can also be used in the bathroom, toilet, bath, swimming pool, aquarium, etc. . It can also be used in civilian or military applications, such as firefighting and water systems, where contact with water is frequent. It not only prevents water from penetrating, but also prevents the penetration of other liquid substances such as oil, so that the device not only measures the water quality but also measures the gas contained in liquid substances such as food, beverage, alcohol, and oil. It can be used for gas measurement where it is in droplet or particle form. In addition, it can be utilized in the human body in which a large amount of water, such as blood or gastric juice.

In addition, according to the present invention, an air compressor may be used to blow uncontaminated air into the fine mesh structure. In the air compressor, a gas such as nitrogen or helium may be stored and used instead of air. Since the injected air initializes the gas sensor, it is possible to measure the gas continuously. Accordingly, the concentration of the gas contained in the water can be measured in real time according to the position of the water or the depth of the water.

In addition, according to the present invention, since a location tracker and a wireless communication unit are provided, a plurality of gas sensors may be networked to build a ubiquitous sensor network system (USN), which may be used to monitor a large area of water in real time.

1 is a conceptual diagram of one embodiment of a gas sensor assembly according to the present invention;
2 is a partial cutaway view of the micromesh structure of the embodiment shown in FIG. 1, FIG.
3 shows embodiments of an airflower,
4 illustrates embodiments of the fine mesh structure;
5 is another embodiment of a fine mesh structure,
6 is another embodiment of a fine mesh structure;
7 is another embodiment of a fine mesh structure;
8 is another embodiment of a fine mesh structure;
9 is a manufacturing flowchart of the fine mesh structure shown in FIG.
FIG. 10 is a conceptual diagram of manufacturing the fine mesh structure shown in FIG. 1 by the method of FIG. 9.

An embodiment of a gas sensor assembly according to the present invention will be described.

The gas sensor assembly for measuring the concentration of fine gas in water shown in FIGS. 1 and 2 includes a fine mesh structure 50, a gas sensor 55, a main body 60, elevating means 65, and an air compressor. (70), air line (75), air valve (80), air flowr (91), position tracker (93), first wireless communication unit (95), second wireless communication unit (97) It includes.

The fine mesh structure 50 includes a fine mesh 52 having a receiving portion 51 formed therein and a plurality of through holes 53 penetrating up to the receiving portion 51. Here, the through hole 53 is formed so as to pass gas but not liquid. For this purpose, the size of the through hole is preferably 10nm ~ 0.5mm in size. In addition, by forming a micro or nano-sized structure on the surface of the fine mesh 52 can be made of a super water-repellent surface that does not adhere to water.

Such micro-nanostructures may act to inhibit biofouling that organisms such as proteins or spores adhere to in water. The material of the fine mesh structure 50 may be coated with a water repellent coating such as Teflon-based fluorocarbon film or self-assembled monolayer (SAM) when the material itself is water repellent or not water repellent.

As such, there are various manufacturing methods for manufacturing the micromesh structure 50 that allows gas to pass but does not pass liquid. Examples thereof include a photoresist coating step S11, an exposure step, and a developing step ( S17, a plating step S19, a photoresist removing step S21, and an etching step S23.

In the photoresist coating step S11, the negative photoresist film 3 is coated on the rod 1, which is a three-dimensional structure (FIG. 10A).

The exposing step is a step of exposing a light source such as UV, X-ray, electron beam, etc. to the photosensitive film 3 using a flexible mesh sheet having a fine pattern formed thereon, the mesh sheet bonding step S13 and the light source irradiating step S15. Equipped. In the mesh sheet bonding step (S13), the rod 1 is wrapped by pulling both ends of the flexible mesh sheet 5 having a fine pattern with a constant force (FIGS. 10B and 10C). In the present embodiment, the weight 7 is attached to the end of the mesh sheet 5 and pulled with a constant force. In the light source irradiation step S15, the area where the light source is exposed is selectively controlled using the slit 9 to expose the light source 11 to the photosensitive film 3 (FIG. 10D).

In the developing step S17, the exposed photosensitive film 5 is developed using a developing solution (Fig. 10E). Then, the portion of the photosensitive film 5 which is not subjected to the light source is selectively removed.

In the plating step S19, the plating layer 13 is formed to a predetermined thickness on the rod 1 on which the photosensitive film 5 is developed using electroplating.

In the photosensitive film removing step S21, the photosensitive film 5 is removed (FIG. 10F). Then, only the plating layer 13 exists in the rod 1.

In the etching step (S23) to remove the rod 1 by etching the circular rod (1) using an etching solution (Fig. 10g). Then only the fine mesh structure remains. 10H is a perspective view of FIG. 10G. 10i and 10j are various micromesh structures that can be produced by the above method. By the above-described method, a micromesh structure 50 may be manufactured that allows gas to pass but does not pass liquid.

4 is another method for forming the micromesh structure. In the case of Figure 4 (a) to form a fine mesh of the planar shape and bonded to the tube to form a fine mesh structure. In the case of FIG. 4 (b), a pair of planar micromeshes are made and attached to the upper and lower surfaces of the hollow edge to form a fine mesh structure. As such, the micromesh structure may be formed by various methods.

The gas sensor 55 is accommodated in the accommodating part 51 of the fine mesh structure 50. Since the gas sensor 55 is in the accommodating part 51 of the fine mesh structure 50, when the fine mesh structure 50 is inserted into the water, only water contained in the water does not flow into the fine mesh structure 50. It flows into the accommodating part 51. Thus, the gas sensor 55 may read the gas coming into the accommodating part 51. Gas sensor 55 may be provided with a multi-gas sensor to measure a variety of different types of gas at the same time, various sensors such as temperature sensor, acoustic sensor, optical sensor, distance measuring sensor, biosensor, etc. It may be provided.

The position tracker 91 is installed inside the fine mesh structure 50 to transmit the position of the fine mesh structure 50.

The first wireless communication unit 95 is installed inside the fine mesh structure 50 to transmit signals from the position tracker 91 and the gas sensor 55 installed inside the fine mesh structure 50 to the outside.

The second wireless communication unit 97 is installed in the main body 60 and receives signals from the gas sensor 55 and the position tracker 91 transmitted from the first wireless communication unit 95. In addition, the second wireless communication unit 97 may receive and transmit the signals of the gas sensor 55 and the position tracker 91. In this case, a plurality of gas sensor assemblies may be networked by installing a plurality of gas sensor assemblies in rivers, reservoirs, seas, pools, aquariums, water purification systems, sewers, and sewage treatment systems to build a ubiquitous sensor network system (USN). It can then be used to monitor large areas of water in real time.

The main body 60 includes a processor 61 and a display portion 63. The processor 61 receives a signal from the gas sensor 55 from the second wireless communication unit 97 provided in the main body 60 and calculates the concentration of the gas measured by the gas sensor 55. In the present embodiment, the gas sensor 55 and the processor 61 are wirelessly connected, but may be connected by wire according to the embodiment. The display unit 63 serves to display the value calculated by the processor 61 to the user. The user can determine the concentration of various gases such as ammonia, methane, carbon phosphate, oxygen, general gases such as nitrogen, various aromatic solvents including benzene and toluene, alcohols such as ethanol and methanol through the label portion 63. Able to know.

Lifting means 65 serves to elevate the fine mesh structure 50. That is, the lifting means 65 lowers the water to the point where the fine mesh structure 50 is to be measured, and serves to raise the fine mesh structure 50 after the measurement. To this end, the lifting means 65 includes a tube 66, a scale 67, and a winding 68. The tube 66 connects the main body 60 and the fine mesh structure 50, and the air line 75 described below enters the inside of the tube 66. When the gas sensor 55 and the processor 61 are connected by a wired signal line, the signal line may also enter the tube 66. Thus, the fine mesh structure 50 is suspended in the main body 60 through the tube 65. The scale 67 is displayed on the tube 66 to indicate how deep the fine mesh structure 50 has descended. In other words, the scale portion 67 tells the descending length of the fine mesh structure 50. The winding unit 68 winds up or unwinds the tube 66. Therefore, when the tube 66 is released using the winding unit 68, the fine mesh structure 50 descends to enter the water. At this time, it can be seen how deep the fine mesh structure 50 has entered through the scale 67. When the tube 66 is wound using the winding unit 68, the fine mesh structure 50 is raised to recover the fine mesh structure 50.

The air compressor 70 is installed in the main body. Air line 75 is connected from the air compressor 70 to the fine mesh structure 50 along the inside of the tube 66 in order to supply the air compressed in the air compressor 70 to the receiving portion of the fine mesh structure 50. do.

The air valve 80 is installed at the end of the air line 75 in the receiving portion 51 to open and close the air line 75. For example, if the concentration of the gas is to be measured according to the depth of the river, the fine mesh structure 50 is inserted into a specific depth, and then the concentration of the gas is measured. The interior of the fine mesh structure 50 is filled with a gas having a specific depth. . And if you want to measure the gas of a different depth through the elevating means 65 to move the fine mesh structure 50 to another depth. In this case, since the inside of the accommodating part 51 of the fine mesh structure 50 is filled with the gas of the measured point, accurate measurement cannot be performed. Therefore, in this case, the inside of the accommodating part 51 of the fine mesh structure 50 should be filled with clean air. At this time, the air compressor 70 is used. When the compressed air is blown into the air compressor 70 after the air valve 80 is opened, clean compressed air that is not contaminated is supplied to the air line 75 to release the gas inside the accommodating part 51 to the outside. Thus, the accommodating part 51 of the fine mesh structure 50 is filled with air supplied from the air compressor 70. Therefore, at a new point, the gas sensor 55 can be used to measure the concentration of the gas. Therefore, using the air compressor 70 can measure the depth of the various points in real time. In addition to air, a gas such as nitrogen or helium may be used as the air compressor 70.

The air flowr 91 is installed in the accommodating part 51 to create an air flow for evenly distributing the gas introduced into the through hole 53 in the accommodating part 51. The air flower 91 diffuses from the outside to allow the gas flowing into the through hole 51 to be quickly introduced into the accommodating part 51, and serves to make the concentration of the gas constant in the accommodating part 51. . The air flow 91 may be in the form of a pinwheel as shown in (a) of FIG. 3, but may have various shapes such as a fan shape as shown in (b) or (c) of FIG. 3.

The micromesh structure 50 shown in FIGS. 1 and 2 maintains a constant shape so that the pressure inside the accommodating part 51 is kept constant. In this case, where the water pressure is low, the liquid may not pass through the through hole 53 but only a gas such as a gas may pass through. However, when the fine mesh structure 50 descends deeply in water, the hydraulic pressure increases to allow the liquid to pass through the through hole 53. In order to prevent this, the fine mesh structure may be formed to elastically contract so that the pressure inside the receiving portion is increased by water pressure when inserted into the water. 5 to 7 is an embodiment of such a fine mesh structure. In the case of FIG. 5, the fine mesh structure 50 is connected to the fine mesh 52 by a flexible rubber or winding type elastic sheet 54 having good elasticity. Thus, when the fine mesh structure 50 is inserted into the water as shown in FIG. 5 (b), the flexible elastic plate 54 is bent inward due to external water pressure. This increases the internal pressure of the receiving portion of the micro mesh structure 50. Therefore, even if the fine mesh structure 50 is inserted in the depth of the water through the hole does not leak can maintain the waterproof ability. 6, the fine mesh structure 50 is provided with the flexible elastic plate 54 spaced apart from the fine mesh 52. In this case, as shown in FIG. 6B, when the fine mesh structure 50 is inserted into the water, the flexible elastic plate 54 is bent inward by external water pressure, thereby increasing the internal pressure of the receiving portion of the fine mesh structure 50. In the case of Figure 7 (a) to install a spring inside to support the fine mesh. Therefore, even in this case, since the spring contracts in proportion to the water pressure, the pressure inside the accommodating part may be increased in response to the external water pressure. In the case of FIG. 7B, the flexible elastic plate is installed on the side to contract the fine mesh structure according to water pressure.

8 is another embodiment of the micromesh structure 50. The fine mesh structure 50 of FIG. 8 is formed by forming the fine mesh 52 in a package of a thio can type (TO-Can) made mainly of a metal used for sensor packaging. In addition, the fine mesh structure can be made in various ways, such as by forming a fine mesh in the compound malting-type package mainly used for semiconductor packaging.

1: rod 3: photosensitive film
5: mesh sheet 7: weight
9: slit 11: light source
13 plating layer 50 fine mesh structure
51: accommodating part 52: fine mesh
53: penetrating portion 54: flexible elastic plate
55 gas sensor 60 body
61 processor 63 display unit
65: lifting means 66: tube
67 division portion 68: winding portion
70: air compressor 80: air valve
91: air flow 93: position tracker
95: first wireless communication unit 97: second wireless communication unit

Claims

A fine mesh structure having a fine mesh having a plurality of through-holes formed therein so as to allow the gas to pass but not let the liquid pass therethrough;
A gas sensor accommodated in the accommodation portion of the fine mesh structure;
A main body including a processor for receiving a signal from the gas sensor and calculating a concentration of the gas measured by the gas sensor, a display unit for displaying a value calculated by the processor;
Elevating means for elevating the fine mesh structure;
An air compressor installed in the main body,
An air line for supplying compressed air of the air compressor to a receiving portion of the fine mesh structure;
Gas sensor assembly for measuring the concentration of fine gas in water including an air valve installed in the receiving portion to open and close the air line.

The method of claim 1,
The elevating means is a gas sensor assembly for measuring the concentration of fine gas in the water, characterized in that it comprises a scale for measuring the length of the fine mesh structure is lowered.

The method of claim 2,
The gas sensor assembly for measuring the concentration of fine gas in the water further comprises an air flower installed in the receiving portion to create an air flow for evenly distributed gas in the through hole in the receiving portion.

The method of claim 3,
The gas sensor assembly for measuring the concentration of fine gas in water further comprises a position tracker installed in the receiving portion for transmitting the position of the fine mesh structure.

5. The method according to any one of claims 1 to 4,
The fine mesh structure is a gas sensor assembly for measuring the concentration of fine gas in the water, characterized in that the elastic contraction so as to increase the pressure inside the receiving portion by the water pressure when inserted in the water.

The method of claim 5,
A first wireless communication unit installed in the accommodating unit to transmit data of the gas sensor and the like in the micro mesh structure;
And a second wireless communication unit installed in the main body so as to receive data from the first wireless communication unit.

The method according to claim 6,
The fine mesh structure is a gas sensor assembly for measuring the concentration of fine gas in the water, characterized in that the part is composed of a flexible elastic plate so that the interior of the receiving portion by the hydraulic pressure.

The method of claim 7, wherein
The fine mesh structure is a gas sensor assembly for measuring the concentration of fine gas in water, characterized in that the nanostructure is formed on the outer surface.

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