CN100451634C - Moisture condensation sensor and method for manufacturing the same - Google Patents
Moisture condensation sensor and method for manufacturing the same Download PDFInfo
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- CN100451634C CN100451634C CNB2005100638545A CN200510063854A CN100451634C CN 100451634 C CN100451634 C CN 100451634C CN B2005100638545 A CNB2005100638545 A CN B2005100638545A CN 200510063854 A CN200510063854 A CN 200510063854A CN 100451634 C CN100451634 C CN 100451634C
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- 238000000034 method Methods 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003292 glue Substances 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 13
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 11
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 11
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- 238000012360 testing method Methods 0.000 description 8
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- 238000012545 processing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 229920001342 Bakelite® Polymers 0.000 description 1
- 241001597008 Nomeidae Species 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The dew sensor of the present invention comprises: a substrate comprising at least two electrodes; at least two comb electrodes; and a sensing layer; wherein, at least two comb electrodes are contacted with two electrode parts on the substrate; the sensing layer contains a cellulose derivative and is formed on at least two comb-shaped electrodes; the invention further comprises a manufacturing method of the condensation sensor, which comprises the following steps: providing a substrate containing at least two electrodes, a conductive adhesive and a sensing adhesive; (b) coating the conductive adhesive on a substrate to form at least two alternative but non-contact comb electrodes, wherein the comb electrodes are partially contacted with two electrodes on the substrate; and (c) coating the sensing glue on the comb electrode; wherein the sensing glue contains a cellulose derivative and carbon powder.
Description
Technical field
The invention relates to a kind of condensation sensor, refer to a kind of especially with the condensation sensor of cellulose chemistry derivant as sensed layer.
Background technology
Along with development of times, industrial sectors such as science and technology, agricultural, weaving, machine room, aviation are navigated too, electric power, more and more need to adopt humidity sensor, industry is high more more to the requirement of product quality, has all become one of standard specification to the control of environment temperature, humidity and to the monitoring of industrial materials moisture content value with analyzing.Humidity is meant the content that water in air is divided, with regard to industrial process, preferable humidity control is about between 0-20%RH, if humidity is when 20%RH, objects such as medicine, food, electronic semi-conductor just begin to go bad, and when 35%RH, metal and electronic products etc. begin to occur oxidation or the aging serious situation of parts, when the 60%RH high humidity, equipment such as photography information optics and the stationery textile is easier can't bear use because of mouldy, so humidity be measured as a very important ring.
The citation form of humidity sensor is to apply wet sensory material to form humidity-sensitive film on substrate, after airborne water vapour is adsorbed in wet sensory material, the impedance of element, dielectric constant can change a lot, and formation moisture sensitivity element, this utilizes moisture content to influence the principle of electric conductivity, more can be in order to making condensation sensor, with the dewfall state that whether reaches capacity of air in the sensing greenhouse.
Be generally the machine box internal cause of avoiding electric product and add water-cooled power converter, and cause the dewfall that temperature inversion causes in the machine box, cause electrical short-circuit or damage, how can in the machine box, install condensation sensor additional, before dewfall, to react early and the feedback control signal, start dehydrating unit, save electric equipment products from damage; Yet general humidity sensor response characteristic curve commonly used is comparatively mild, therefore often fails to reach 80%-90%RH in humidity and may in time react during dewfall; In addition, the sensor of known metallic oxide type uses similar IC wafer formula processing procedure to make more, and it is loaded down with trivial details that it prepares process, and material and processing procedure expense cost an arm and a leg, and therefore can't popularize in the general low price consumer goods and use.
Summary of the invention
Cellulosic chemical derivative one hydroxyethyl cellulose (HydroxyethylCellulose, HEC) have good thickening, emulsification, suspension, dispersion, maintenance moisture content, the anti-performances such as thing erosion, potent NMF of supporting one's family, it is a kind of cellulose polymer electrolyte non-ionic surfactant, the present invention utilizes the characteristic of hydroxyethyl cellulose, in conjunction with simple processing procedure, develop a condensation sensor that is applicable in the Electric Apparatus Chassis.
Condensation sensor of the present invention comprises: the substrate that contains at least two electrodes; At least two comb electrodes; An and sensed layer; Wherein, at least two comb electrodes be with substrate on two electrode part divide and to contact; Sensed layer is to contain a cellulose derivative, and is formed at least two comb electrodes.
The present invention more comprises a kind of method for making of condensation sensor, and its step comprises: (a) provide a substrate that contains at least two electrodes, a conducting resinl and a sensing glue; (b) conducting resinl be coated on form on this substrate at least between two-phase but not contacted comb electrode, and this comb electrode to be part contact with two electrodes on this substrate; And (c) this sensing glue is coated on this comb electrode; Wherein this sensing glue is to contain a cellulose derivative and a carbon dust.
Be applicable to that substrate of the present invention can be any substrate commonly used,, be preferably and possess the ceramic substrate that pair of electrodes is arranged as ceramic wafer, bakelite plate or glass mat; Formed comb electrode material can be the conductive material that any electrode of using always is used on substrate, as gold size, elargol, carbon paste, is preferably the carbon paste that contains a carbon dust; The preferable hydroxyethyl cellulose that can be of cellulose derivative that sensed layer of the present invention is contained; Its content is decided by user mode, the preferable 5-15% that can be total amount; And sensed layer of the present invention more comprises a carbon dust composition, and its content is decided by user mode equally, the preferable 5-15% that can be total amount.
In the method for making of the present invention, the coating method in the step (b) can be commonly used any, preferable can formation by wire mark; And after step (b) is finished, before step (c) is carried out, can more comprise a step (b 1), substrate is dried, so that the coated conducting resinl of step (b) can be complete fixedly be attached on the substrate: and after in the end step (c) is finished, more can comprise a step (c1), with this substrate oven dry.
Description of drawings
Fig. 1 is the preparation structural plan figure of the embodiment of the invention 1.
Fig. 2 is the relative humidity test result figure of output voltage of the present invention with respect to condensation sensor.
Embodiment
Embodiment 1
The high molecular step of preparation hydroxyethyl cellulose is as follows: with the cellulose is raw material, after adding NaOH is reacted into the cellulose of alkaliization, adds reactions of alkylene oxide again, promptly gets hydroxyethyl cellulose macromolecule interfacial activating agent.
Preparation carbon black material: consider big or small the reaching of carbon black granules and can evenly mix, and adopt SFG-75 series (Switzerland), so add the action impedance value elasticity adjustment that the visual sensor of proportion is splashed and risen with the humidity moisture absorption with HEC.
The making of carbon paste: mainly being used in variohm thick film screen printing processing procedure, is to adopt carbon black SFG-75 series (Switzerland), adds the phenolic resin material compatible with pcb board, and in wherein adding the toluene equal solvent, even stirring is concentrated make.
The making of humidity glue: hydroxyethyl cellulose (about 5-15%) is added an amount of pure water, about 70-80%, and the even stirring of required carbon black (about 5-15%) makes, and even separation is concentrated to be mixed.
Embodiment 2
The manufacturing process of condensation sensor of the present invention please refer to Fig. 1.
At first provide one to possess two ends silver electrode 20,21 ceramic substrate 10 (main composition A1203), as Fig. 1 a, on substrate 10, carry out with wire mark (mesh select #100-#250) printing, embodiment 1 is prepared the carbon paste wire mark finished on ceramic substrate 10, the pattern of printing is two relative pectinations 31,32, promptly an end is intersected with each other but does not join, and the other end respectively is connected in the electrode 20 on the ceramic substrate, 21, shown in Fig. 1 b; Then after the oven dry in 3 minutes of drying stove 180 degree, again with humidity glue 40 to be covered in the mode on the comb electrode 31,32 fully, be printed on the carbon paste area, the oven dry in 5 minutes of drying stove 200 degree forms the condensation sensor structure shown in Fig. 1 c at last again.
The mode of printing of whole carbon paste figure in the present embodiment mainly can increase the tack between contact area and increase humidity glue and substrate.
The correlation parameter of wire mark is as follows: (A) 50 wiping half tones of every seal (B) half tone tension force 34Kg/cm once
2(C) print speed printing speed 30cm/s (D) printing gap 0.6mm.
Embodiment 3
Detect and partly at first use standard constant-humidity constant-temperature machine testing, use two electrodes of clamp clamps condensation sensor, see through lead and be connected to avometer, the humidity and the temperature of established standards constant-humidity constant-temperature machine, condensation sensor two interelectrode resistance values are measured in stable back; In addition, also can plan to build and put that simple type humidity production method---the saturated common salt water law detects, mainly can be according to Japanese Industrial Standards--and JIS B7920 " hygrometer---method for testing performance ", the saturated aqueous solution of different salts can produce different relative humidity down in constant temperature.Testing result please refer to Fig. 2.
Fig. 2 is the result who tests under 25 ℃, and wherein M worker N, AVG, MAX represent condensation sensor two interelectrode resistance values; The test of use standard constant-humidity constant-temperature machine, temperature is set at 25 ℃, use two electrodes of clamp clamps condensation sensor, see through lead and be connected to avometer, test 10 condensation sensors simultaneously, test was respectively condensation sensor two interelectrode resistance values at 60%, 75%, 80%, 85%, 90%, 93%, 95% o'clock in humidity, and get 10 MIN, AVG, MAX resistance values in the condensation sensor, result such as Fig. 2.
Resistance curve is exponential type and draws high during humidity 80%-90%RH, and this is the operating point of dewfall sensing material.Cardinal principle is that dried humidity glue can be splashed after moisture absorption and risen, and causes resistance to increase, and whole resistance curve is for to the exponential type curve that raises up.
The foregoing description only is to give an example for convenience of description, and the interest field that the present invention advocated should be as the criterion so that the protection domain of claim is described certainly, but not only limits to the foregoing description.
Claims (11)
1. a condensation sensor is characterized in that, comprising:
The substrate that contains at least two electrodes;
At least two comb electrodes; And
One sensed layer;
Wherein, this at least two comb electrode be with this substrate on this two electrode part divide and contact; This sensed layer contains a hydroxyethyl cellulose, and the content of this hydroxyethyl cellulose is the 5-15% of total amount, and is formed on this at least two comb electrode.
2. condensation sensor as claimed in claim 1 is characterized in that, wherein this substrate is a ceramic substrate.
3. condensation sensor as claimed in claim 1 is characterized in that, wherein this at least two comb electrode contains a carbon dust.
4. condensation sensor as claimed in claim 1 is characterized in that, wherein this sensed layer also comprises a carbon dust composition.
5. condensation sensor as claimed in claim 4 is characterized in that, wherein the content of this carbon dust composition is the 5-15% of total amount in this sensed layer.
6. the method for making of a condensation sensor is characterized in that, step comprises:
(a) provide a substrate that contains at least two electrodes, a conducting resinl and a sensing glue;
(b) this conducting resinl is coated on forms on this substrate at least between two-phase but not contacted comb electrode, and this comb electrode part contacts with two electrodes on this substrate; And
(c) this sensing glue is coated on this comb electrode;
Wherein this sensing glue contains a hydroxyethyl cellulose and a carbon dust, and the content of this hydroxyethyl cellulose is the 5-15% of total amount.
7. method for making as claimed in claim 6 is characterized in that, wherein this substrate in the step (a) is a ceramic substrate.
8. method for making as claimed in claim 6 is characterized in that, wherein the content of this carbon dust composition is the 5-15% of total amount in this humidity layer.
9. method for making as claimed in claim 6 is characterized in that, wherein the coating method in this step (b) is to form with wire mark.
10. method for making as claimed in claim 6 is characterized in that, wherein after this step (b) is finished, before this step (c) is carried out, also comprises a step (b1), with this substrate oven dry.
11. method for making as claimed in claim 6 is characterized in that, wherein also comprises a step (c1) after this step (c) is finished, with this substrate oven dry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100638545A CN100451634C (en) | 2005-04-07 | 2005-04-07 | Moisture condensation sensor and method for manufacturing the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100638545A CN100451634C (en) | 2005-04-07 | 2005-04-07 | Moisture condensation sensor and method for manufacturing the same |
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| Publication Number | Publication Date |
|---|---|
| CN1844906A CN1844906A (en) | 2006-10-11 |
| CN100451634C true CN100451634C (en) | 2009-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100638545A Expired - Fee Related CN100451634C (en) | 2005-04-07 | 2005-04-07 | Moisture condensation sensor and method for manufacturing the same |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018147358A1 (en) * | 2017-02-09 | 2018-08-16 | パナソニックＩｐマネジメント株式会社 | Dew condensation sensor, dew condensation sensing system and refrigerator |
| CN109150637A (en) * | 2018-10-31 | 2019-01-04 | 上海剑桥科技股份有限公司 | Early warning failure system and the network equipment with early warning failure function |
| KR102355439B1 (en) * | 2020-07-10 | 2022-01-26 | 경상국립대학교산학협력단 | Evaluation and calibration method for dew sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4481813A (en) * | 1981-10-28 | 1984-11-13 | Hitachi, Ltd. | Dew sensor |
| CN88102294A (en) * | 1988-04-28 | 1988-10-12 | 中国建筑科学研究院空气调节研究所 | Condensation sensor |
| CN2085963U (en) * | 1991-01-31 | 1991-10-02 | 中国建筑科学研究院空调研究所 | Film type dewing sensor |
| CN1072504A (en) * | 1991-11-19 | 1993-05-26 | 电子科技大学 | Non-linear moisture sensor |
-
2005
- 2005-04-07 CN CNB2005100638545A patent/CN100451634C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4481813A (en) * | 1981-10-28 | 1984-11-13 | Hitachi, Ltd. | Dew sensor |
| CN88102294A (en) * | 1988-04-28 | 1988-10-12 | 中国建筑科学研究院空气调节研究所 | Condensation sensor |
| CN2085963U (en) * | 1991-01-31 | 1991-10-02 | 中国建筑科学研究院空调研究所 | Film type dewing sensor |
| CN1072504A (en) * | 1991-11-19 | 1993-05-26 | 电子科技大学 | Non-linear moisture sensor |
Non-Patent Citations (2)
| Title |
|---|
| 一种新型的耐水性高分子湿度传感器. 莫天麟等.大气科学，第17卷第3期. 1993 * |
| 新型高分子湿敏电阻的研制. 何鹏等.云南大学学报，第19卷第2期. 1997 * |
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| Publication number | Publication date |
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| CN1844906A (en) | 2006-10-11 |
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