JPH0774781B2 - Near infrared humidity measuring device - Google Patents
Near infrared humidity measuring deviceInfo
- Publication number
- JPH0774781B2 JPH0774781B2 JP15783690A JP15783690A JPH0774781B2 JP H0774781 B2 JPH0774781 B2 JP H0774781B2 JP 15783690 A JP15783690 A JP 15783690A JP 15783690 A JP15783690 A JP 15783690A JP H0774781 B2 JPH0774781 B2 JP H0774781B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light emitting
- rotary
- rotary reflecting
- reflecting plate
- 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 - Fee Related
Links
Landscapes
- Optical Measuring Cells (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は配管を流れる気体の湿度を近赤外線を用いて測
定する近赤外線湿度計測装置に関し、特に配管内に面し
て近赤外線を発光及び受光する発光・受光装置の開口面
に汚れが生じても、湿度計測精度が低下しないようにし
たものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a near-infrared humidity measuring device for measuring the humidity of a gas flowing through a pipe by using near-infrared rays, and particularly emits and receives near-infrared rays facing a pipe. The present invention relates to a device for preventing humidity measurement accuracy from being deteriorated even if an opening surface of a light emitting / receiving device is contaminated.
この近赤外線湿度計測装置は、水分が赤外線の特定の波
長に大きな吸収度を持つことを利用したものであり、吸
収度と湿度の関係から湿度を計測することができる。This near-infrared humidity measuring device utilizes the fact that water has a large absorption at a specific wavelength of infrared rays, and can measure humidity from the relationship between the absorption and humidity.
従来の技術 従来の近赤外線湿度計測装置を第３図を参照して説明す
る。これは、気体配管31の管底に反射板32を取り付け、
この反射板32に対向して管頂に近赤外線の発光口及び反
射板32からの近赤外線を受光する受光口を有する発光・
受光装置33を取り付けたもので、発光装置33から配管31
に水分に吸収される波長の近赤外線を照射して反射板32
で反射せしめ、受光装置33で受光した近赤外線量に基づ
いて湿度を算出するものである。2. Description of the Related Art A conventional near infrared humidity measuring device will be described with reference to FIG. This is a reflector 32 attached to the bottom of the gas pipe 31,
Light emission having a near-infrared emission port at the top of the tube facing the reflection plate 32 and a light reception port for receiving the near-infrared light from the reflection plate 32.
With the light receiving device 33 installed, connect the light emitting device 33 to the pipe 31
Reflector 32 irradiates near-infrared rays with a wavelength absorbed by water to
And the humidity is calculated based on the amount of near infrared light received by the light receiving device 33.
本発明が解決しようとする課題 上記のものでは、発光・受光装置33の配管31に面する開
口面が配管中の異物等の付着によって汚れると、発光・
受光レベルが低下するので、正確に湿度を計測できない
問題があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above, when the opening surface of the light emitting / receiving device 33 facing the pipe 31 becomes dirty due to adhesion of foreign matter in the pipe,
Since the light receiving level is lowered, there is a problem that the humidity cannot be accurately measured.
従って、本発明の技術的課題は、発光及び受光面に汚れ
が生じても、正確に湿度を計測できるようにすることで
ある。Therefore, a technical object of the present invention is to enable accurate humidity measurement even if the light emitting and light receiving surfaces are contaminated.
課題を解決するための手段 上記の技術的課題を解決するために講じた本発明の技術
的手段は、気体配管に取り付けた近赤外線の発光口及び
受光口を有する発光・受光装置と、発光・受光口に対向
して配置した第１の回転反射板と、第１の回転反射板と
発光・受光口の間に配置した第２の回転反射板と、発光
装置から照射される近赤外線を第１の回転反射板に直接
到達せしめるように第２の回転反射板に形成した開口
と、第１及び第２の回転反射板を掃除する部材と、受光
装置で受光した第１及び第２の回転反射板からの反射近
赤外線量から湿度を算出する算出装置とからなるもので
ある。Means for Solving the Problems Technical means of the present invention taken to solve the above technical problems include a light emitting / receiving device having a near infrared light emitting port and a light receiving port attached to a gas pipe, and a light emitting / receiving device. A first rotary reflecting plate arranged facing the light receiving port, a second rotary reflecting plate arranged between the first rotary reflecting plate and the light emitting / light receiving port, and a near infrared ray emitted from the light emitting device The opening formed in the second rotary reflecting plate so as to reach the first rotary reflecting plate directly, the member for cleaning the first and second rotary reflecting plates, and the first and second rotations received by the light receiving device. The calculation device calculates the humidity from the amount of near-infrared rays reflected from the reflection plate.
作用 上記の技術的手段の作用は下記の通りである。Action The action of the above technical means is as follows.
発光装置から照射された近赤外線は第２の回転反射板に
反射されて受光装置で受光される。また第２の回転板は
回転しており、かつ開口を設けているので、近赤外線が
開口を通過した場合は、その近赤外線は第１の回転反射
板に反射されて受光装置で受光される。The near infrared rays emitted from the light emitting device are reflected by the second rotary reflecting plate and received by the light receiving device. Further, since the second rotating plate is rotating and the opening is provided, when the near infrared rays pass through the opening, the near infrared rays are reflected by the first rotating reflecting plate and are received by the light receiving device. .
第１及び第２の回転板は掃除部材によって掃除され同じ
状態に保たれるので、汚れの差が生じることはない。発
光・受光装置の発光及び受光面に配管中の異物が付着し
て汚れても、その汚れによる発光レベルの低下、及び第
１と第２の回転反射板から反射された近赤外線量の受光
レベルの低下は同量である。近赤外線は発光・受光装置
から両回転反射板までの距離の差によって水分に吸収さ
れる割合が異なる。従って、第１及び第２の回転反射板
から反射された近赤外線量の差を検出することにより、
汚れに影響されずに正確な湿度を計測することができ
る。Since the first and second rotary plates are cleaned by the cleaning member and kept in the same state, there is no difference in dirt. Even if foreign matter in the pipe adheres to the light-emitting and light-receiving surfaces of the light-emitting / light-receiving device and becomes dirty, the light-emitting level decreases due to the dirt and the light-receiving level of the amount of near-infrared light reflected from the first and second rotary reflecting plates Is the same amount. The ratio of near infrared rays absorbed by water varies depending on the difference in the distance from the light emitting / receiving device to both rotary reflectors. Therefore, by detecting the difference in the amount of near infrared rays reflected from the first and second rotary reflecting plates,
Accurate humidity can be measured without being affected by dirt.
発明の効果 本発明は下記の特有の効果を生じる。EFFECTS OF THE INVENTION The present invention produces the following unique effects.
上記のように本発明によれば、発光及び受光面に汚れが
生じても、正確に湿度を計測できる。As described above, according to the present invention, even if the light emitting and light receiving surfaces are contaminated, the humidity can be accurately measured.
実施例 上記の技術的手段の具体例を示す実施例を説明する（第
１図と第２図参照）。Example An example showing a concrete example of the above technical means will be described (see FIGS. 1 and 2).
流体配管１の管頂に水分に吸収される波長の近赤外線を
照射する発光口と下記の反射板からの近赤外線の反射光
を受光する受光を有した２線光ファイハーコネクタ２を
取り付ける。A two-line optical fiber connector 2 having a light emitting port for irradiating near infrared rays having a wavelength absorbed by water and a light receiving for receiving reflected light of near infrared rays from a reflection plate described below is attached to the top of the fluid pipe 1.
２線光ファイバーコネクタ２に対向して第１の回転反射
板３と第２の回転反射板４を配置する。第１及び第２の
回転反射板３・４は、上下端を配管１にベアリング５・
６を介して回転自在に連結された回転軸７に取り付けら
れている。第１の回転反射板３の下方には回転羽根８を
回転軸７に取り付けて、配管１内の流体の流れによって
回転軸７が回転せしめられるようにしている。第１及び
第２の回転反射板３・４は第２図に示すように、円板の
外周側に切り欠きを設けてほぼ十字状に形成したもの
で、互いに重なり合わないようにしている。この切り欠
きが第２の回転反射板の開口を成す。A first rotary reflector 3 and a second rotary reflector 4 are arranged so as to face the two-wire optical fiber connector 2. The upper and lower ends of the first and second rotary reflectors 3 and 4 are attached to the pipe 1 and the bearings 5 and 5, respectively.
It is attached to a rotary shaft 7 rotatably connected via 6. A rotary blade 8 is attached to the rotary shaft 7 below the first rotary reflection plate 3 so that the rotary shaft 7 can be rotated by the flow of the fluid in the pipe 1. As shown in FIG. 2, the first and second rotary reflecting plates 3 and 4 are formed in a substantially cross shape by providing a notch on the outer peripheral side of the discs so that they do not overlap each other. This notch forms the opening of the second rotary reflector.
配管１には取付部材９を取り付け、そこに第１及び第２
の回転反射板３・４を掃除するブラシ10・11を取り付け
ている。A mounting member 9 is attached to the pipe 1, and the first and second members are attached to the mounting member 9.
Brushes 10 and 11 for cleaning the rotary reflectors 3 and 4 are attached.
水分に吸収される波長の近赤外線は、発光装置である発
光素子12から生じた光にして、その波長の光のみを透過
させるフィルタレンズ13を介して、２線光ファイバ14に
導かれ、２線光ファイバーコネクタ２の発光面から配管
１に照射される。照射された近赤外線は配管１内の流体
流れによって回転している第１及び第２の回転反射板３
・４により反射され、交互に２線光ファイバーコネクタ
２の受光面から２線光ファイバー14を通って受光装置で
ある受光素子15に受光され、受光量に応じた電気信号が
発生される。この電気信号を増幅器16を介して算出装置
17に入力する。算出装置17は交互に入力される反射光レ
ベルの差から配管１内の湿度を算出する。The near-infrared light having a wavelength absorbed by water is converted into light generated from the light emitting element 12 which is a light emitting device, and is guided to the two-wire optical fiber 14 through the filter lens 13 that transmits only the light having the wavelength. The pipe 1 is irradiated with light from the light emitting surface of the line optical fiber connector 2. The irradiated near-infrared rays are rotated by the fluid flow in the pipe 1, and the first and second rotary reflecting plates 3 are rotated.
The light is reflected by 4 and is alternately received from the light receiving surface of the 2-wire optical fiber connector 2 through the 2-wire optical fiber 14 to be received by the light receiving element 15 which is a light receiving device, and an electric signal corresponding to the amount of received light is generated. Calculation device for this electric signal via the amplifier 16
Enter in 17. The calculator 17 calculates the humidity in the pipe 1 from the difference between the reflected light levels that are alternately input.
第１図は本発明の実施例の近赤外線湿度計測装置の概略
構成図、第２図は第１及び第２の回転反射板の平面図、
第３図は従来の近赤外線湿度計測装置の概略構成図であ
る。 2:2線光ファイバーコネクタ 3:第１の回転反射板 4:第２の回転反射板 7:回転軸 8:回転羽根 9:発光素子 10・11:ブラシ 15:受光素子 17:演算装置FIG. 1 is a schematic configuration diagram of a near-infrared humidity measuring device of an embodiment of the present invention, FIG. 2 is a plan view of first and second rotary reflecting plates,
FIG. 3 is a schematic configuration diagram of a conventional near infrared humidity measuring device. 2: 2-line optical fiber connector 3: 1st rotary reflector 4: 2nd rotary reflector 7: Rotating shaft 8: Rotating blade 9: Light emitting element 10/11: Brush 15: Light receiving element 17: Arithmetic device
Claims (1)
び受光口を有する発光・受光装置と、発光・受光口に対
向して配置した第１の回転反射板と、第１の回転反射板
と発光・受光口の間に配置した第２の回転反射板と、発
光装置から照射される近赤外線を第１の回転反射板に直
接到達せしめるように第２の回転反射板に形成した開口
と、第１及び第２の回転反射板を掃除する部材と、受光
装置で受光した第１及び第２の回転反射板からの反射近
赤外線量から湿度を算出する算出装置とからなる近赤外
線湿度計測装置。1. A light emitting / receiving device having a near infrared ray emitting port and a light receiving port attached to a gas pipe, a first rotary reflecting plate arranged to face the light emitting / receiving port, and a first rotary reflecting plate. And a second rotary reflecting plate disposed between the light emitting / receiving port and an opening formed in the second rotary reflecting plate so that near infrared rays emitted from the light emitting device can directly reach the first rotary reflecting plate. , A near-infrared humidity measurement including a member for cleaning the first and second rotary reflecting plates, and a calculation device for calculating humidity from the amount of near-infrared light reflected by the first and second rotary reflecting plates received by the light receiving device apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15783690A JPH0774781B2 (en) | 1990-06-15 | 1990-06-15 | Near infrared humidity measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15783690A JPH0774781B2 (en) | 1990-06-15 | 1990-06-15 | Near infrared humidity measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0448246A JPH0448246A (en) | 1992-02-18 |
| JPH0774781B2 true JPH0774781B2 (en) | 1995-08-09 |
Family
ID=15658402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15783690A Expired - Fee Related JPH0774781B2 (en) | 1990-06-15 | 1990-06-15 | Near infrared humidity measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0774781B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020016472A (en) * | 2018-07-23 | 2020-01-30 | 東京都下水道サービス株式会社 | Gas concentration measuring device |
-
1990
- 1990-06-15 JP JP15783690A patent/JPH0774781B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0448246A (en) | 1992-02-18 |
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