Detection component and detection equipment comprising same

Abstract

The utility model provides a detection component and detection equipment comprising the same. The detection member comprises: a substrate (1); the fluorescent layer (2) is arranged on the surface of the substrate (1); the light shielding layer (3) covers the fluorescent layer (2); the light shielding layer (3) is covered with the protective layer (4), the protective layer (4) and the light shielding layer (3) are made of different materials, and the protective layer (4) is made of one of nylon, polytetrafluoroethylene, polyvinylidene fluoride and polypropylene. The detection equipment provided by the utility model comprises the detection component.

Description

Technical Field

[0001] The present application belongs to the field of dissolved oxygen detection, and specifically relates to a detection component and a detection device containing the same. Background Art

[0002] Dissolved oxygen is an important water quality indicator and can be measured by a dissolved oxygen meter.

[0003] The measurement method of dissolved oxygen includes fluorescence method, which can determine the dissolved oxygen content in water based on the quenching effect of oxygen molecules on fluorescent substances. Among them, the fluorescent cap is the core component of the dissolved oxygen meter.

[0004] The patent with the announcement number CN216669742U discloses a detachable fluorescent cap. In the thickness direction of the fluorescent cap, the fluorescent cap includes adjacent light-transmitting sheets, fluorescent films and light-isolating coatings.

[0005] Among them, the light isolation coating can not only shield external light to reduce signal interference, but also protect the fluorescent film to prevent it from being polluted and damaged by external substances. The thicker the light isolation coating, the better its light shielding performance, but at the same time the air permeability will decrease, reducing the sensitivity of the fluorescent film to dissolved oxygen and improving the response time.

[0006] The light-isolating coating is a part of the dissolved oxygen meter that is in direct contact with water. The natural water environment is complex, for example, it may be filled with suspended solids such as mud, branches, etc., which are relatively hard. The suspended solids can easily contaminate and damage the light-isolating coating that is in direct contact with water. In addition, for the purpose of cleaning, the light-isolating coating needs to be scrubbed with a cleaning brush, which can easily cause wear of the light-isolating coating. That is, the scratch resistance and wear resistance of the existing light-isolating coating need to be improved. Utility Model Content

[0007] In order to solve or improve at least one of the problems mentioned in the background technology, the present application provides a detection component and a detection device including the same.

[0008] The detection component is used to detect the concentration of oxygen molecules, and the detection component includes:

[0009] substrate;

[0010] A fluorescent layer, wherein the fluorescent layer is disposed on the surface of the substrate;

[0011] a light shielding layer, the light shielding layer covering the fluorescent layer;

[0012] A protective layer, wherein the protective layer covers the light-shielding layer, and the material of the protective layer is different from that of the light-shielding layer. The material of the protective layer is one of nylon, polytetrafluoroethylene, polyvinylidene fluoride, and polypropylene.

[0013] In at least one embodiment, the protective layer is a porous membrane made of nylon, and the diameter a of the pores in the porous membrane satisfies 0 μm<a≤0.8 μm.

[0014] In at least one embodiment, the light shielding layer is a black silicone adhesive layer.

[0015] In at least one embodiment, the thickness b of the light-shielding layer satisfies 20 μm≤b≤80 μm, and the light-shielding layer makes the transmittance of light with a wavelength of 200 to 1000 nm less than 1%.

[0016] In at least one embodiment, the thickness c of the protective layer satisfies 90 μm≤c≤110 μm.

[0017] In at least one embodiment, the sum d of the thicknesses of the light shielding layer and the protective layer satisfies: 110 μm<d≤190 μm.

[0018] In at least one embodiment, the detection component further includes a reflective layer, wherein the reflective layer is disposed between the fluorescent layer and the light shielding layer, and the reflective layer is used to reflect the fluorescence generated by the fluorescent layer when it is excited.

[0019] In at least one embodiment, the sum e of the thicknesses of the light shielding layer, the protective layer and the reflective layer satisfies: 110 μm<e≤190 μm.

[0020] In at least one embodiment, the thickness f of the reflective layer satisfies 20 μm≤f≤40 um.

[0021] The detection device provided in the present application includes the detection component as described above.

[0022] The present application provides a protective layer outside the light-shielding layer, thereby improving the hardness and strength of the film layer outside the fluorescent layer, improving the scratch resistance and wear resistance, and extending the service life of the detection component.

[0023] The detection device provided in this application also has the above advantages because it includes the above detection components. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a detection component according to a first embodiment of the present application is shown.

[0025] Figure 2 A schematic structural diagram of a detection component according to a second embodiment of the present application is shown.

[0026] Figure 3 The fluorescence lifetime diagram of the detection component according to the embodiment of the present application in the air-oxygen-free water-air environment is shown.

[0027] Description of Reference Numerals

[0028] 1 substrate; 2 fluorescent layer; 3 shading layer; 4 protective layer; 5 reflecting layer. DETAILED DESCRIPTION

[0029] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0030] Embodiments of the present application provide a detection component and a detection device including the same.

[0031] See also Figure 1 In the first embodiment of the present application, the detection component may include a substrate 1, a fluorescent layer 2, a light shielding layer 3 and a protective layer 4 in sequence.

[0032] Exemplarily, the substrate 1 can be quartz, organic glass, etc., and has light transmittance, for example, the transmittance of light with a wavelength of 400 to 1000 nm is greater than 90%.

[0033] The fluorescent layer 2 may include a matrix material and an oxygen sensitive indicator. For example, the matrix material may be a silicone gel, an organic silicon polymer, polystyrene, cellulose, etc., which have good air permeability and light transmittance, and the oxygen sensitive indicator may be ruthenium bipyridine, ruthenium o-phenanthroline, metal porphyrin and its derivatives, etc.

[0034] The light shielding layer 3 may be organic silicon rubber, for example, the light shielding layer may be solidified from black silicone containing black pigment. Among all polymer films, organic silicon rubber has excellent oxygen permeability, which is more than 2 orders of magnitude better than other polymers.

[0035] The hardness of silicone is generally low, and even if it can be enhanced by additives, it is limited after all. When nylon material is used as a cleaning brush, silicone is used as a light-shielding layer without a protective layer 4, the detection component can withstand less than 90,000 brushing times, and the actual service life in a water environment is only 0.5 to 5 months.

[0036] The service life can be increased by increasing the thickness of silicone glue, but the applicant found that when the thickness of silicone glue is 200 μm, the dissolved oxygen response time of the detection component from air to water environment is greater than 10 minutes. That is, the increase in thickness will significantly reduce the oxygen sensitivity of the detection component and increase the response time.

[0037] In order to ensure the sensitivity of the detection component to dissolved oxygen and increase the scratch resistance and wear resistance at the same time, the present application proposes to set a protective layer 4 on the light shielding layer 3.

[0038] The protective layer 4 can be a porous film, which can provide protection for the light shielding layer 3 while ensuring air permeability, and increase the scratch resistance and wear resistance of the detection component. The material of the protective layer 4 can be nylon, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polypropylene (PP), etc.

[0039] Preferably, the protective layer 4 can be a porous membrane made of nylon, wherein the diameter a of the pores satisfies 0μm<a≤0.8μm. For example, it can be 0.1μm, 0.22μm, 0.23μm, 0.26μm, 0.3μm, 0.4μm, 0.5μm, 0.7μm, 0.75μm, 0.8μm, etc., which will not be described one by one here.

[0040] See also Figure 2 In the second embodiment of the present application, the detection component may further include a reflective layer 5, which is disposed between the fluorescent layer 2 and the light shielding layer 3. The fluorescent layer 2 is excited by the excitation light source in the detection device to generate fluorescence, and the reflective layer 5 can reflect the fluorescence, and the reflected fluorescence passes through the substrate 1 into the photosensitive element (not shown in the figure) of the detection device to improve the signal-to-noise ratio.

[0041] Compared with not providing the reflective layer 5 , providing the reflective layer 5 can increase the fluorescence intensity received by the photosensitive element by about 30%.

[0042] The reflective layer 5 can be a slurry formed by mixing a solvent, a polymer, and silicon dioxide, or a slurry formed by mixing a solvent, a polymer, and titanium dioxide. Of course, the present application does not limit the specific materials.

[0043] In one embodiment of the present application, the material of the light shielding layer 3 is silicone glue, and its thickness b can satisfy 20μm≤b≤80μm, and the light shielding layer 3 makes the transmittance of light with a wavelength of 200-1000nm less than 1% to prevent external stray light from interfering with the detection signal. Among them, the thickness b can be, for example, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 62μm, 65μm, 68μm, 70μm, 72μm, 75μm, 78μm, 80μm, etc., which will not be repeated here.

[0044] In one embodiment of the present application, the material of the protective layer 4 is nylon, and its thickness c can satisfy 90 μm ≤ c ≤ 110 μm. The thickness c can be, for example, 90 μm, 92 μm, 95 μm, 98 μm, 100 μm, 102 μm, 105 μm, 108 μm, 110 μm, etc., which will not be described in detail here.

[0045] In the first embodiment of the present application, the sum d of the thicknesses of the light shielding layer 3 and the protective layer 4 can satisfy 110 μm < d ≤ 190 μm, so as to ensure that when the detection component switches from air conditions to anaerobic conditions, the dissolved oxygen response time is less than 10 minutes. The thickness d can be, for example, 112 μm, 115 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm, 150 μm, 155 μm, 160 μm, 165 μm, 170 μm, 175 μm, 180 μm, 185 μm, 190 μm, etc., which will not be described one by one here.

[0046] In the second embodiment of the present application, the sum of the thicknesses e of the light shielding layer 3, the protective layer 4, and the reflective layer 5 can satisfy 110 μm < e ≤ 190 μm, so as to ensure that the dissolved oxygen response time is less than 10 minutes when the detection component switches from air conditions to anaerobic conditions. The thickness e can be, for example, 112 μm, 115 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm, 150 μm, 155 μm, 160 μm, 165 μm, 170 μm, 175 μm, 180 μm, 185 μm, 190 μm, 195 μm, 200 μm, etc., which will not be repeated here.

[0047] In one embodiment of the present application, the thickness f of the reflective layer 5 may satisfy 20 μm ≤ f ≤ 40 μm, for example, 20 μm, 25 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, etc., which will not be described in detail here.

[0048] Exemplarily, the light shielding layer 3 and the protective layer 4 may be provided on the fluorescent layer 2 by the following steps.

[0049] Step 1: Scrape and apply the light shielding layer 3 of silicone adhesive material on the surface of the fluorescent layer 2, control the thickness of the light shielding layer 3 to be 70 μm, and make the light shielding layer 3 uniform without holes, scratches, particle protrusions, etc.

[0050] Step 2: Attach the protective layer 4 made of nylon material to the light shielding layer 3, so that the protective layer 4 is attached at an accurate position, has no creases on the surface, and has no curling on the edges.

[0051] Step 3: Cover the protective layer 4 with a release film and apply a pressure of, for example, 10 to 30 KPa.

[0052] Step 4: Remove the release film and let it stand at room temperature for >24 hours to allow the silicone adhesive to solidify.

[0053] After testing, when the brush is made of nylon, the brush repeatedly scrapes the protective layer 4, and the protective layer 4 is not damaged after 220,000 scrapes. The test component is placed in a natural water environment for 6 months without damage.

[0054] The detection device provided in the present application includes the above detection component, an excitation light source and a photosensitive component. The light emitted by the excitation light source can irradiate the fluorescent layer 2 through the substrate 1, and the light emitted by the fluorescent layer 2 can irradiate the photosensitive component through the substrate 1.

[0055] When the oxygen content is constant, the fluorescence intensity is greatly affected by the content of the fluorescent indicator in the fluorescent layer. The indicator is positively correlated with the fluorescence intensity within a certain concentration range, while the fluorescence lifetime is basically unchanged within a certain concentration range of the indicator. The detection components that characterize oxygen concentration based on fluorescence lifetime can be calibrated using a unified mathematical model, without the need to calibrate each device separately.

[0056] For example, the excitation light source can emit blue light, and the blue light can penetrate the substrate 1 to illuminate the fluorescent layer 2. The fluorescent layer 2 is excited to generate red fluorescence. Since oxygen molecules can quench fluorescence, the fluorescence intensity and fluorescence lifetime are reduced, that is, the lifetime of the red light generated by the excitation is inversely proportional to the concentration of oxygen molecules. The higher the oxygen concentration, the shorter the fluorescence lifetime. The photosensitive component receives the red light excited by the fluorescent layer 2 through the substrate 1. Through corresponding calculations, the concentration of oxygen molecules can be obtained.

[0057] See also Figure 3 The change of fluorescence lifetime of the detection component in the air-oxygen-free water-air environment is shown in the figure.

[0058] 0-100 seconds, the detection component is in an air environment, and the oxygen concentration in the air is about 21%. The fluorescence lifetime is short and remains stable.

[0059] At 100 seconds, the test parts were placed in oxygen-free water.

[0060] From 100 to 500 seconds, the fluorescence lifetime gradually increases, and from 500 to 1200 seconds, the fluorescence lifetime tends to be stable. This proves that the response time of the detection component from an aerobic environment to an anaerobic environment is about 400 seconds, which can meet the requirement of a shorter response time (e.g., less than 10 minutes).

[0061] At 1200 seconds, the test part was placed from the oxygen-free water into an air environment.

[0062] From 1200 to 1240 seconds, the fluorescence lifetime decreases rapidly and becomes stable after 1240 seconds. This proves that the response time of the detection component from an anaerobic environment to an aerobic environment is about 40 seconds, which can meet the requirement of a shorter response time.

[0063] The advantages of the detection component provided by the present application include: adding a protective layer, improving the hardness and strength of the film layer outside the fluorescent layer, improving the scratch resistance and wear resistance, and extending the service life. By setting a suitable material and thickness for the film layer outside the fluorescent layer, a shorter response time is ensured from an aerobic environment to an anaerobic environment, and from an anaerobic environment to an aerobic environment.

[0064] The detection device provided in the present application also has the above advantages because it has the above detection components.

[0065] The above is a preferred embodiment of the present application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A detection component for detecting the concentration of oxygen molecules, characterized in that: include: substrate; A fluorescent layer, wherein the fluorescent layer is disposed on the surface of the substrate; a light shielding layer, the light shielding layer covering the fluorescent layer; A protective layer, wherein the protective layer covers the light shielding layer, and the material of the protective layer is different from that of the light shielding layer. The material of the protective layer is one of nylon, polytetrafluoroethylene, polyvinylidene fluoride, and polypropylene.

2. The detection component according to claim 1, characterized in that: The protective layer is a porous membrane made of nylon, and the diameter a of the pores in the porous membrane satisfies 0 μm<a≤0.8 μm.

3. The detection component according to claim 1, characterized in that: The light shielding layer is a black silicone adhesive layer.

4. The detection component according to claim 1, characterized in that: The thickness b of the light-shielding layer satisfies 20 μm≤b≤80 μm, and the light-shielding layer makes the transmittance of light with a wavelength of 200 to 1000 nm less than 1%.

5. The detection component according to claim 1, characterized in that: The thickness c of the protective layer satisfies 90 μm≤c≤110 μm.

6. The detection component according to claim 1, characterized in that: The sum d of the thicknesses of the light shielding layer and the protective layer satisfies 110 μm<d≤190 μm.

7. The detection component according to claim 1, characterized in that: The detection component further includes a reflection layer, which is disposed between the fluorescent layer and the light shielding layer, and is used for reflecting the fluorescence generated by the fluorescent layer when it is excited.

8. The detection component according to claim 7, characterized in that: The sum e of the thicknesses of the light shielding layer, the protective layer and the reflective layer satisfies 110 μm<e≤190 μm.

9. The detection component according to claim 7, characterized in that: The thickness f of the reflective layer satisfies 20 μm≤f≤40 μm.

10. A detection device, characterized in that: The invention comprises the detection component according to any one of claims 1 to 9.

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