JPH02260504A - Humidity sensor - Google Patents
Humidity sensorInfo
- Publication number
- JPH02260504A JPH02260504A JP1081081A JP8108189A JPH02260504A JP H02260504 A JPH02260504 A JP H02260504A JP 1081081 A JP1081081 A JP 1081081A JP 8108189 A JP8108189 A JP 8108189A JP H02260504 A JPH02260504 A JP H02260504A
- Authority
- JP
- Japan
- Prior art keywords
- humidity
- dispersed
- alumina particles
- humidity sensor
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 12
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract description 2
- 238000003618 dip coating Methods 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000026041 response to humidity Effects 0.000 description 1
- 230000006903 response to temperature Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Non-Adjustable Resistors (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、湿度に対応して素子の電気的特性が変化する
ことにより湿度を検出する湿度センサに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a humidity sensor that detects humidity by changing the electrical characteristics of an element in response to humidity.
［従来の技術］
近年、湿度計測、湿度制御を必要とする分野が増加し、
湿度センサの重要性が認められるようになった。[Conventional technology] In recent years, the number of fields requiring humidity measurement and humidity control has increased.
The importance of humidity sensors is now recognized.
温度に対応して素子の電気的特性が変化することにより
湿度を検出する湿度センサには、電解質系、金属系、高
分子系、セラミックス系等があり、それぞれいろいろな
系が研究されているが、現在実用化されているものは、
高分子系およびセラミックス系の湿度センサである。い
ずれも、素子に対する水の吸脱着により、素子の抵抗値
または静電容量が変化する性質を利用したものである。Humidity sensors that detect humidity by changing the electrical characteristics of the element in response to temperature include electrolyte-based, metal-based, polymer-based, ceramic-based, etc., and various systems are being researched. , those currently in practical use are:
These are polymer-based and ceramic-based humidity sensors. All of these utilize the property that the resistance value or capacitance of the element changes due to adsorption and desorption of water to the element.
［発明が解決しようとする課題］
しかし、従来の湿度センサは、高湿度、低湿度で精度が
悪く、高温高湿の環境で長期間使用すると劣化してしま
うという欠点があった。特に、高分子系湿度センサは、
高温高温中での劣化が顕著である。セラミックス系湿度
センサには、一定時間毎に素子を数１００℃に加熱し、
劣化した特性を回復させる、加熱リフレッシュという機
構を設けた製品がある。この場合、加熱リフレッシュに
より経時変化は小さくできるが、素子が高温になるため
、可燃性のガスや粉塵の存在するところでは爆発や火災
の危険があり使用できない。このように、満足すべき特
性を持つ湿度センサは、現状では皆無であるといっても
過言ではない。[Problems to be Solved by the Invention] However, conventional humidity sensors have the disadvantage that their accuracy is poor in high humidity and low humidity, and that they deteriorate when used for a long period of time in a high temperature and high humidity environment. In particular, polymer-based humidity sensors
Deterioration is noticeable at high temperatures. For ceramic humidity sensors, the element is heated to several hundred degrees Celsius at regular intervals.
Some products are equipped with a heating refresh mechanism that restores deteriorated properties. In this case, aging can be reduced by heating and refreshing, but since the element becomes high temperature, it cannot be used in areas where flammable gas or dust is present due to the risk of explosion or fire. It is no exaggeration to say that there are currently no humidity sensors with satisfactory characteristics.
そこで本発明はこのような問題点を解決するもので、そ
の目的とするところは、広範囲の湿度を精度良く測定で
き、過酷な環境でも劣化しない、高精度でかつ信頼性の
高い湿度センサを提供するところにある。The present invention aims to solve these problems, and its purpose is to provide a highly accurate and reliable humidity sensor that can accurately measure humidity over a wide range and does not deteriorate even in harsh environments. It's there.
［課題を解決するための手段］
本発明の湿度センサは、アルミナ粒子を分散させたシリ
カ膜を感湿膜として用いることを特徴とする。[Means for Solving the Problems] The humidity sensor of the present invention is characterized in that a silica film in which alumina particles are dispersed is used as a moisture-sensitive film.
シリカ膜単体でも感湿特性を持たせることはできる。し
かし、シリカ膜にアルミナ粒子を分散させることにより
、膜厚、細孔径、クラックの状態等を制御でき、より好
ましい特性を持った湿度センサを得ることができる。A silica film alone can have moisture-sensitive properties. However, by dispersing alumina particles in a silica film, the film thickness, pore diameter, crack state, etc. can be controlled, and a humidity sensor with more preferable characteristics can be obtained.
［実施例］
テトラエトキシシラン（Ｓ ｉ （ＯＣａＨｓ）４）
５０ｍｌにエタノール２５ｍ１．０．０２Ｎ塩酸４ｍｌ
を加え、１時間撹拌することによりテトラエトキシシラ
ンを加水分解した後、グリセリン１０ｍ１、微粉末シリ
カ１３．５ｇを加え、３０分間撹拌し、さらにアルミナ
粒子２３ｇを加え、３０分間撹拌することにより、アル
ミナ粒子を分散させたシリカゾルを作製した。Ｐｔ−Ｐ
ｄ１ｌ形電極をスクリーン印刷により形成したアルミナ
基板上に、このゾルをデイツプコーティングし、１００
°Ｃで１０分間乾燥し、４５０℃で３０分間焼結し、ア
ルミナ粒子を分散させたシリカ膜を形成した。[Example] Tetraethoxysilane (S i (OCaHs)4)
50ml 25ml ethanol1.0.02N hydrochloric acid 4ml
and stirred for 1 hour to hydrolyze tetraethoxysilane, then added 10 ml of glycerin and 13.5 g of finely powdered silica, stirred for 30 minutes, and then added 23 g of alumina particles and stirred for 30 minutes. A silica sol with particles dispersed therein was prepared. Pt-P
This sol was dip coated onto an alumina substrate on which a d1l type electrode was formed by screen printing.
It was dried at °C for 10 minutes and sintered at 450 °C for 30 minutes to form a silica film with alumina particles dispersed therein.
このようにして製作した湿度センサの断面図を第１図に
示す。第１図において、１は基板、２は電極、３はアル
ミナ粒子を分散させたシリカ膜である。本湿度センサの
感湿特性を第２図に示す。A cross-sectional view of the humidity sensor manufactured in this manner is shown in FIG. In FIG. 1, 1 is a substrate, 2 is an electrode, and 3 is a silica film in which alumina particles are dispersed. Figure 2 shows the humidity sensitivity characteristics of this humidity sensor.
第２図より、相対湿度の変化に対する抵抗値の変化の直
線性が良く、抵抗値が大きくなる低湿度でも測定し易い
抵抗値であることがわかる。本湿度センサを６０°Ｃ１
相対湿度９５％の恒温恒温層中。From FIG. 2, it can be seen that the linearity of the change in resistance value with respect to the change in relative humidity is good, and the resistance value is easy to measure even at low humidity where the resistance value becomes large. This humidity sensor is 60°C1
In a constant temperature constant temperature layer with relative humidity of 95%.
に１０００時間放置後、感湿特性を測定したところ、第
２図と測定誤差の範囲内で同様であった。After being left for 1000 hours, the moisture sensitivity characteristics were measured, and the results were the same as in FIG. 2 within the range of measurement error.
したがって、本湿度センサは、耐久性、信頼性が高いこ
とがわかる。Therefore, it can be seen that this humidity sensor has high durability and reliability.
［発明の効果］
以上述べたように本発明の湿度センサは、アルミナ粒子
を分散させたシリカ膜を感湿膜として用いるので、相対
湿度の変化に対する抵抗値の変化の直線性が良く、抵抗
値が大きくなる低湿度でも測定し易い抵抗値の湿度セン
サを製造することができるため、広範囲の湿度を精度良
く測定することができる。また、シリカ膜は化学的に安
定であるため、過酷な環境でも劣化しない。したがって
、高精度、高信頼性湿度センサとして、湿度計測、湿度
制御を必要とする分野に広く応用することができる。[Effects of the Invention] As described above, since the humidity sensor of the present invention uses a silica film in which alumina particles are dispersed as a humidity sensitive film, the change in resistance value has good linearity with respect to changes in relative humidity, and the resistance value Since it is possible to manufacture a humidity sensor with a resistance value that is easy to measure even at low humidity where the humidity is large, it is possible to accurately measure humidity over a wide range. Furthermore, since silica membranes are chemically stable, they do not deteriorate even in harsh environments. Therefore, as a highly accurate and highly reliable humidity sensor, it can be widely applied to fields requiring humidity measurement and humidity control.
２・・・電極
３・・・アルミナ粒子を分散させたシリカ膜第２図は、
本発明の湿度センサの感湿特性図。2...Electrode 3...A silica film in which alumina particles are dispersed.
FIG. 3 is a diagram of humidity sensitivity characteristics of the humidity sensor of the present invention.
以上 出願人 セイコーエプソン株式会社 代理人 弁理士 銘木 喜三部 他１名that's all Applicant: Seiko Epson Corporation Agent: Patent attorney: Kisanbe Meiki and 1 other person
第１図は本発明の湿度センサの断面図。 １・・・基板 FIG. 1 is a sectional view of the humidity sensor of the present invention. 1... Board
Claims (1)
いることを特徴とする湿度センサ。A humidity sensor characterized by using a silica film in which alumina particles are dispersed as a moisture-sensitive film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1081081A JPH02260504A (en) | 1989-03-31 | 1989-03-31 | Humidity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1081081A JPH02260504A (en) | 1989-03-31 | 1989-03-31 | Humidity sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02260504A true JPH02260504A (en) | 1990-10-23 |
Family
ID=13736440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1081081A Pending JPH02260504A (en) | 1989-03-31 | 1989-03-31 | Humidity sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02260504A (en) |
-
1989
- 1989-03-31 JP JP1081081A patent/JPH02260504A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR940002635B1 (en) | Humidity sensor | |
| JPH02260503A (en) | Humidity sensor | |
| JPH02260504A (en) | Humidity sensor | |
| JPH02260502A (en) | Humidity sensor | |
| JPH02260506A (en) | Humidity sensor | |
| JPH02260505A (en) | Humidity sensor | |
| JPS589056A (en) | Moisture sensitive resistance element | |
| JP2707246B2 (en) | Humidity sensor | |
| JPH02283002A (en) | Humidity sensor | |
| JPH02257048A (en) | Humidity sensor | |
| JPH0256902A (en) | Humidity detector | |
| JPH02132803A (en) | Humidity sensor | |
| JPH0336702A (en) | Humidity sensor | |
| JPH02232901A (en) | Humidity sensor | |
| JPH03242543A (en) | Moisture sensor | |
| JPH04326053A (en) | Moisture sensor | |
| JPH03295457A (en) | Humidity sensor | |
| JPH03242544A (en) | Moisture sensor | |
| JPH03242542A (en) | Moisture sensor | |
| JPH03242545A (en) | Moisture sensor | |
| JPH01183439A (en) | Production of humidity sensor | |
| JPH01321350A (en) | Moisture detector | |
| JPH03295456A (en) | Humidity sensor | |
| JPS6359521B2 (en) | ||
| JPS6149622B2 (en) |