JPH0619086Y2 - Humidity sensor condensation prevention device - Google Patents
Humidity sensor condensation prevention deviceInfo
- Publication number
- JPH0619086Y2 JPH0619086Y2 JP10005688U JP10005688U JPH0619086Y2 JP H0619086 Y2 JPH0619086 Y2 JP H0619086Y2 JP 10005688 U JP10005688 U JP 10005688U JP 10005688 U JP10005688 U JP 10005688U JP H0619086 Y2 JPH0619086 Y2 JP H0619086Y2
- Authority
- JP
- Japan
- Prior art keywords
- humidity sensor
- dew condensation
- prevention device
- condensation prevention
- heat
- 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.)
- Expired - Lifetime
Links
- 230000005494 condensation Effects 0.000 title claims description 30
- 238000009833 condensation Methods 0.000 title claims description 30
- 230000002265 prevention Effects 0.000 title claims description 15
- 239000000919 ceramic Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000004065 semiconductor Substances 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 7
- 230000003405 preventing effect Effects 0.000 description 10
- 230000004044 response Effects 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Description
【考案の詳細な説明】 ［考案の目的］ （産業上の利用分野） 本考案は、湿度センサの結露防止装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a dew condensation prevention device for a humidity sensor.
（従来の技術） セラミック湿度センサは、相対湿度による電気抵抗の変
化によって湿度を測定するもので、湿度測定が容易で、
かつ精度のよい湿度測定が可能であることから、広く使
用されている。(Prior Art) A ceramic humidity sensor measures humidity by the change in electrical resistance due to relative humidity, and humidity measurement is easy,
It is widely used because it can measure humidity accurately.
しかしながら、これら湿度センサは、使用中結露すると
湿度センサとしての性能が発揮できず、目的とする湿度
測定ができなくなる。However, these humidity sensors cannot exhibit the performance as a humidity sensor when dew condensation occurs during use, and the desired humidity measurement cannot be performed.
そのため、結露防止手段が必要であり、従来は第２図に
示すように基板１１上に、例えばメッシュフィルタから
なる感湿部１２を設けたセラミック湿度センサ１３を配
設し、この湿度センサ１３の感湿部１２と対向した前記
基板１１上に抵抗体の電気的損失を利用した発熱抵抗体
１４を配設し、この発熱抵抗体１４を必要なときだけ発
熱させて、前記セラミック湿度センサ１３を構成する感
湿素子の表面温度を２〜４℃上昇させ、結露防止をはか
るようにした湿度センサの結露防止装置が考えられる。Therefore, a dew condensation preventing means is required. Conventionally, as shown in FIG. 2, a ceramic humidity sensor 13 provided with a humidity sensitive portion 12 made of, for example, a mesh filter is arranged on the substrate 11, and the humidity sensor 13 is provided. A heating resistor 14 utilizing electric loss of the resistor is disposed on the substrate 11 facing the moisture sensitive portion 12, and the heating resistor 14 is caused to generate heat only when necessary, and the ceramic humidity sensor 13 is operated. A dew condensation prevention device for a humidity sensor is conceivable in which the surface temperature of the moisture-sensitive element to be formed is raised by 2 to 4 ° C. to prevent dew condensation.
しかしながら、上記構成になる湿度センサの結露防止装
置は、実用上多くの問題点をかかえている。However, the dew condensation prevention device of the humidity sensor having the above-mentioned configuration has many problems in practical use.
すなわち、発熱抵抗体からの熱は、セラミック湿度セン
サ１３のみに伝わることなく廻りに分散するため、セラ
ミック湿度センサ１３を必要温度に上昇するのに、無駄
な熱量が必要となる。その結果、実際に必要とする電力
よりも大きな電力を必要とする。That is, since the heat from the heating resistor is dispersed around the ceramic humidity sensor 13 without being transmitted to the ceramic humidity sensor 13, a wasteful amount of heat is required to raise the temperature of the ceramic humidity sensor 13 to a required temperature. As a result, it requires more power than is actually needed.
また、セラミック湿度センサ１３と発熱抵抗体１４間は
空間となっており、この空間での空気の流動により発熱
抵抗体１４からの熱の伝導が損われ、それだけに結露防
止の応答性が悪くなる。Further, there is a space between the ceramic humidity sensor 13 and the heating resistor 14, and the flow of air in this space impairs the conduction of heat from the heating resistor 14, which deteriorates the responsiveness of dew condensation prevention.
そのため、上記構成になる湿度センサの結露防止装置に
おいて、必要最小限の消費電力で効率的な結露防止をは
かるため、セラミック湿度センサ１３と発熱抵抗体１４
の対向距離を吟味し、発熱抵抗体１４の熱をセラミック
湿度センサ１３に有効に伝導することも考えられるが、
作業並びに構造が複雑化するため、必ずしも有効とは言
えなかった。Therefore, in the dew condensation prevention device of the humidity sensor having the above-described configuration, in order to efficiently prevent the dew condensation with the minimum necessary power consumption, the ceramic humidity sensor 13 and the heating resistor 14 are provided.
It is considered that the heat of the heating resistor 14 is effectively conducted to the ceramic humidity sensor 13 by examining the facing distance of
It was not always effective because the work and structure became complicated.
（考案が解決しようとする課題） 以上のように、従来の湿度センサの結露防止装置は、結
露防止のために必要な熱を湿度センサに精度よく、かつ
迅速に伝導する点において難点があった。(Problems to be Solved by the Invention) As described above, the conventional dew condensation preventing device for a humidity sensor has a drawback in that heat necessary for preventing dew condensation is accurately and quickly conducted to the humidity sensor. .
本考案は、上記の点に鑑みてなされたもので、簡単な構
造にして結露防止に必要な熱を湿度センサに効率よく伝
導できる湿度センサの結露防止装置を提供することを目
的とするものである。The present invention has been made in view of the above points, and an object of the present invention is to provide a dew condensation prevention device for a humidity sensor, which has a simple structure and can efficiently transfer heat necessary for dew condensation prevention to the humidity sensor. is there.
［考案の構成］ （課題を解決するための手段） 本考案に係る湿度センサの結露防止装置は、基板上にセ
ラミック湿度センサと発熱体を対向配設してなる湿度セ
ンサの結露防止装置において、前記発熱体が熱放射性半
導体素子からなることを特徴とするものである。[Configuration of Device] (Means for Solving the Problem) A dew condensation prevention device for a humidity sensor according to the present invention is a dew condensation prevention device for a humidity sensor, wherein a ceramic humidity sensor and a heating element are disposed on a substrate so as to face each other. It is characterized in that the heating element is composed of a heat-radiative semiconductor element.
（作用） 以上の構成からなる湿度センサの結露防止装置によれ
ば、発熱体が熱放射性半導体素子からなっているため、
空気の流動による影響なく熱を湿度センサのみに効率よ
く放射することが可能で、必要最小限の消費電力で結露
防止の応答性が良好となる。(Operation) According to the dew condensation prevention device of the humidity sensor having the above-described configuration, since the heating element is composed of the heat radiating semiconductor element,
It is possible to efficiently radiate heat only to the humidity sensor without being affected by the flow of air, and the responsiveness for preventing dew condensation is improved with the minimum required power consumption.
（実施例） 以下、本考案の一実施例につき説明する。(Embodiment) An embodiment of the present invention will be described below.
すなわち、第１図に示すように、基板１上に感湿部２を
設けたセラミック湿度センサ３を配設し、前記セラミッ
ク湿度センサ３の近傍で、かつ前記感湿部２と対向する
前記基板１上に、スポットが前記感湿部２に当たる状態
で赤外線放射ダイオードからなる熱放射性半導体素子４
を配設するものである。That is, as shown in FIG. 1, a ceramic humidity sensor 3 provided with a moisture sensitive portion 2 is provided on a substrate 1, and the substrate is provided in the vicinity of the ceramic humidity sensor 3 and facing the moisture sensitive portion 2. 1. A heat radiating semiconductor element 4 composed of an infrared radiating diode on which a spot hits the moisture sensitive portion 2.
Is provided.
以上のように構成してなる湿度センサの結露防止装置に
よれば、結露防止を目的としたセラミック湿度センサ３
への熱は、赤外線放射ダイオードからなる熱放射性半導
体素子４からの放射熱であるため、空間での空気の流れ
があってもセラミック湿度センサ３のみに必要な熱を集
中して伝えることが容易である。According to the dew condensation prevention device for a humidity sensor configured as described above, the ceramic humidity sensor 3 for the purpose of preventing dew condensation is provided.
Since the heat to the ceramic radiant heat is the radiant heat from the heat radiating semiconductor element 4 including the infrared radiating diode, it is easy to concentrate and transmit the necessary heat only to the ceramic humidity sensor 3 even if there is an air flow in the space. Is.
したがって、従来のように発熱抵抗体の熱を利用し結露
防止する装置と比較して、低い電力で、かつセラミック
湿度センサ３と発熱体としての熱放射性半導体素子４間
の対向距離ｌを特別吟味することなく、有効な結露防止
効果を得ることができる。Therefore, as compared with the conventional device that uses the heat of the heating resistor to prevent dew condensation, the facing distance 1 between the ceramic humidity sensor 3 and the heat radiating semiconductor element 4 as the heating device is lower than that of the conventional device. It is possible to obtain an effective dew condensation preventing effect.
以下、その理由を実験例に基づき述べる。Hereinafter, the reason will be described based on experimental examples.
すなわち、第３図は第１図に本考案Ａと第２図に示す参
考例Ｂそれぞれにおけるセラミック湿度センサを構成す
る感湿素子の表面が２℃上昇するための対向距離ｌに対
する消費電力の関係を示すもので、第４図は本考案Ａと
従来例Ｂの時間に対するセラミック湿度センサを構成す
る感湿素子の熱応答性の関係を示すものである。That is, FIG. 3 shows the relationship of the power consumption with respect to the facing distance 1 for raising the surface of the humidity sensing element constituting the ceramic humidity sensor in the invention A and the reference example B shown in FIG. 2 by 2 ° C. FIG. 4 shows the relationship of the thermal response of the humidity sensitive element constituting the ceramic humidity sensor with respect to time in the present invention A and the conventional example B.
なお、第４図の時間については対向距離ｌと消費電力Ｗ
を種々変えた場合をまとめて傾向性を表示した関係上、
具体的数値を示さなかった。For the time shown in FIG. 4, the facing distance 1 and the power consumption W
Because the tendency is displayed collectively for various changes,
No specific value was given.
第３図から明らかなように、従来例Ｂは対向距離ｌに対
する消費電力の関係が比例関係にあり、対向距離ｌが大
きければ大きな消費電力が必要であるのに対し、本考案
Ａは対向距離ｌに対する消費電力がゆるやかな上昇であ
り、小さな消費電力で結露防止が可能であることを示し
ている。As is apparent from FIG. 3, in the conventional example B, the power consumption is proportional to the facing distance l, and if the facing distance l is large, the power consumption is large. The power consumption with respect to l is a gradual increase, indicating that dew condensation can be prevented with a small power consumption.
また、第４図から明らかなように、従来例Ｂに対し本考
案Ａが結露防止に必要な熱応答性が格段に優れている結
果を示した。Further, as is clear from FIG. 4, the invention A showed a significantly superior thermal response required for dew condensation prevention to the conventional example B.
以上の結果は、本考案Ａは湿度センサの結露防止に必要
な赤外線が湿度センサと赤外線放射ダイオード間に存在
する空気の流動に関係なくセラミック湿度センサを構成
する感湿素子に集中されていることによるものと言え
る。The above results indicate that the device A according to the present invention concentrates the infrared rays necessary for preventing the dew condensation of the humidity sensor on the humidity sensitive element constituting the ceramic humidity sensor regardless of the flow of air existing between the humidity sensor and the infrared emitting diode. It can be said to be due to.
なお、上記実施例では、熱放射性半導体素子として赤外
線放射ダイオードを例示して説明したが、集光性可視光
ダイオード又は遠赤外線ダイオードを用いても同効であ
る。In addition, in the said Example, although an infrared ray radiating diode was illustrated and demonstrated as a heat radiative semiconductor element, it is the same effect even if a condensing visible light diode or a far infrared ray diode is used.
［考案の効果］ 本考案Ａによれば、簡単な構造にして、かつ小さな消費
電力で優れた熱応答性が得られる実用的価値の高い湿度
センサの結露防止装置を得ることができる。[Advantage of the Invention] According to the present invention A, it is possible to obtain a dew condensation preventing device of a practical value having a simple structure and having a high thermal response with a small power consumption.
第１図は本考案の一実施例に係る湿度センサの結露防止
装置を示す斜視図、第２図は従来の参考例に係る湿度セ
ンサの結露防止装置を示す斜視図、第３図は対向距離と
消費電力の関係を示す曲線図、第４図は時間と温度上昇
の関係を示す曲線図である。 １……基板 ２……感湿部 ３……セラミック湿度センサ ４……熱放射性半導体素子FIG. 1 is a perspective view showing a dew condensation preventing device for a humidity sensor according to an embodiment of the present invention, FIG. 2 is a perspective view showing a dew condensation preventing device for a humidity sensor according to a conventional reference example, and FIG. And FIG. 4 is a curve diagram showing the relationship between power consumption and power consumption, and FIG. 4 is a curve diagram showing the relationship between time and temperature rise. 1 ... Substrate 2 ... Moisture sensitive part 3 ... Ceramic humidity sensor 4 ... Thermal radiation semiconductor element
Claims (1)
対向配設してなる湿度センサの結露防止装置において、
前記発熱体が熱放射性半導体素子からなることを特徴と
する湿度センサの結露防止装置。1. A dew condensation prevention device for a humidity sensor, wherein a ceramic humidity sensor and a heating element are arranged on a substrate so as to face each other.
A dew condensation prevention device for a humidity sensor, wherein the heating element is formed of a heat-radiative semiconductor element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10005688U JPH0619086Y2 (en) | 1988-07-27 | 1988-07-27 | Humidity sensor condensation prevention device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10005688U JPH0619086Y2 (en) | 1988-07-27 | 1988-07-27 | Humidity sensor condensation prevention device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0221551U JPH0221551U (en) | 1990-02-13 |
| JPH0619086Y2 true JPH0619086Y2 (en) | 1994-05-18 |
Family
ID=31327786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10005688U Expired - Lifetime JPH0619086Y2 (en) | 1988-07-27 | 1988-07-27 | Humidity sensor condensation prevention device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0619086Y2 (en) |
-
1988
- 1988-07-27 JP JP10005688U patent/JPH0619086Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0221551U (en) | 1990-02-13 |
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