JPS60344A - Optical device - Google Patents
Optical deviceInfo
- Publication number
- JPS60344A JPS60344A JP10829283A JP10829283A JPS60344A JP S60344 A JPS60344 A JP S60344A JP 10829283 A JP10829283 A JP 10829283A JP 10829283 A JP10829283 A JP 10829283A JP S60344 A JPS60344 A JP S60344A
- Authority
- JP
- Japan
- Prior art keywords
- retroreflector
- temperature
- dew point
- surface temperature
- detecting
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Optical Measuring Cells (AREA)
Abstract
Description
【発明の詳細な説明】
（ａ） 発明の技術分野
本発明は光学装置に係り、特に光学的手段による大気特
性測定装置等の、送受光折り返し用レトロリフレクタの
結露防止方式に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an optical device, and more particularly to a dew condensation prevention method for a retroreflector for transmitting and receiving light in an atmospheric characteristic measuring device using optical means.
（ｂ） 従来技術と問題点
従来ガス濃度測定装置等の光学的大気特性測定装置に使
用されるレトロリフレクタは、短期的測定に使用される
場合や、長期的に使用される場合でも、可視光等の場合
には適当な窓材で覆う等の手段を用いることにより、レ
トロリフレクタ表面の結露は、殆ど問題になることは無
かった。しかし３〜１５〔μｍ〕の波長の赤外域では、
安価な窓材がないため、レトロリフレクタの上にフード
等の覆いを設ける程度の対策しかなく、しばしばレトロ
リフレクタ表面に結露し、これにより送られて来た平行
光が乱反射されてしまい、そのため測定が不可能になる
。(b) Prior art and problems Conventional retroreflectors used in optical atmospheric characteristic measuring devices such as gas concentration measuring devices do not emit visible light even when used for short-term measurements or long-term measurements. In such cases, dew condensation on the retroreflector surface rarely becomes a problem by using measures such as covering it with an appropriate window material. However, in the infrared region with a wavelength of 3 to 15 [μm],
Since there is no cheap window material, the only countermeasure is to put a cover such as a hood over the retroreflector, which often causes condensation on the surface of the retroreflector, which causes the parallel light sent to it to be diffusely reflected, making it difficult to measure. becomes impossible.
（Ｃ１発明の目的
本発明の目的は、レトロリフレクタ表面における結露を
防止し得る光学装置を提供することにある。(C1 Object of the Invention An object of the invention is to provide an optical device that can prevent dew condensation on the surface of a retroreflector.
ｔｄ） 発明の構成
本発明の特徴は、所定の信号光を送出及び受光する送受
光学系と該送受光学系から送出された信号光を折り返す
ためのレトロリフレクタとを備え、且つ、前記レトロリ
フレクタの表面温度を検知するための表面温度検知手段
と、前記レトロリフレクタ近傍の大気の露点検知手段と
、前記レトロリフレクタを加熱する手段と、レトロリフ
レクタの表面温度制御手段とを具備し、前記表面温度制
御手段は、前記表面色度検知手段及び露点検知手段とに
より検知されたしｌ・ロリフレクタの表面温度と大気の
露点とに基づき、前記レトロリフレクタ加熱手段を作動
せしめてレトロリフレクタの表面温度を所望の温度に制
御するように構成されたことにある。td) Structure of the Invention The present invention is characterized by comprising a transmitting/receiving optical system for transmitting and receiving a predetermined signal light, and a retroreflector for returning the signal light transmitted from the transmitting/receiving optical system. A surface temperature detection means for detecting a surface temperature, a dew point detection means for the atmosphere near the retroreflector, a means for heating the retroreflector, and a surface temperature control means for the retroreflector, the surface temperature control means The means operates the retroreflector heating means to obtain a desired surface temperature of the retroreflector based on the surface temperature of the retroreflector and the dew point of the atmosphere detected by the surface chromaticity detection means and the dew point detection means. It is configured to control the temperature.
（ｅｌ 発明の実施例 以下本発明の一実施例を図面を参照しながら説明する。(el Embodiments of the invention An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明に係る光学装置の一実施例としての、大
気特性測定装置の光学系の要部構成を示す断面図、第２
図は上記光学系内に設けられたレトロリフレクタを背面
側より見た斜視図、第３図は上記レトロリフレクタの温
度とその近傍の大気中の湿度を検知するためのしドロリ
フレクタの構成を示す断面図、第４図は上記レトロリフ
レクタの温度を結露防止可能温度に制御するための制御
回路を示すブロック図である。FIG. 1 is a cross-sectional view showing the main structure of an optical system of an atmospheric characteristic measuring device as an embodiment of the optical device according to the present invention, and FIG.
The figure is a perspective view of the retroreflector installed in the optical system as seen from the back side, and Figure 3 shows the configuration of the retroreflector for detecting the temperature of the retroreflector and the humidity in the atmosphere in its vicinity. The sectional view and FIG. 4 are block diagrams showing a control circuit for controlling the temperature of the retroreflector to a temperature at which dew condensation can be prevented.
上記第１図において、１は送受光学系、２は送光ｇ１５
．３はレンズ、４は折り曲げ受信鏡、５は反射鏡、６は
受光部、７はレトロリフレクタである。In Fig. 1 above, 1 is the transmitting/receiving optical system, and 2 is the light transmitting g15.
．． 3 is a lens, 4 is a folding receiving mirror, 5 is a reflecting mirror, 6 is a light receiving section, and 7 is a retroreflector.
上記本実施例のレトロリフレフタフには、裏面に第２図
に示すようにヒータ８が、また表面には第３図に見られ
・る如く、レトロリフレクタ７の表面温度Ｔ１を検知す
るための温度センサ９が設けられている。更にレトロリ
フレフタフの近傍に、大気の湿度を検知するための湿度
センサ１０が配置されている。上記湿度センサ１０は乾
球温度検知器１１と湿球温度検知器１２とからなる。The retroreflector of this embodiment has a heater 8 on the back side, as shown in FIG. 2, and a heater 8 on the front side, as shown in FIG. 3, for detecting the surface temperature T1 of the retroreflector 7. A temperature sensor 9 is provided. Furthermore, a humidity sensor 10 for detecting the humidity of the atmosphere is arranged near the retrorefrigeration tank. The humidity sensor 10 includes a dry bulb temperature detector 11 and a wet bulb temperature detector 12.
上記温度計センサ９及び乾球温度検知器１１と湿球温度
検知器１２によって検知された温度Ｔ＋ 、Ｔ２ 。Temperatures T+ and T2 detected by the thermometer sensor 9, the dry bulb temperature detector 11, and the wet bulb temperature detector 12.
Ｔ３に対応するアナログ信号出力は、第４図しこ示ずよ
うにそれぞれ、レトロリフレクタの温度制御回路に設け
られたアンプ１３．１４．１５に入力され、これにより
増幅された後、それぞれＡ／Ｄコンノく一タ１６． １
７．１８によってアナログ信号からディジクル信号に変
換され、それぞれの温度に対応するディジタル信号とし
て出力される。The analog signal output corresponding to T3 is input to amplifiers 13, 14, and 15 provided in the temperature control circuit of the retroreflector, respectively, as shown in FIG. D Konno Kuichita 16. 1
7.18, the analog signal is converted into a digital signal and output as a digital signal corresponding to each temperature.
このうちＡ／Ｄコンバータ１７及びＡ／Ｄコンバーター
１８の出力により、湿度−露点変換テーブル２０のアド
レスが参照され、湿度−露点変換テーブル２０から対応
する露点（これは露点温度とも言われる）′ｒ４が出力
される。このように本実施例では上記乾球温度検知器１
１．湿球温度検知器１２．アンプ１４．１５及び湿度−
露点変換テーブル２０により、露点検知手段２３を構成
している。Among these, the address of the humidity-dew point conversion table 20 is referred to by the output of the A/D converter 17 and the A/D converter 18, and the corresponding dew point (also called dew point temperature) 'r4 is determined from the humidity-dew point conversion table 20. is output. In this way, in this embodiment, the dry bulb temperature sensor 1
1. Wet bulb temperature detector12. Amp 14.15 and humidity -
The dew point conversion table 20 constitutes a dew point detection means 23.
温度センサ１０により検知されたレトロリフレフタフの
温度Ｔ１に対応してＡ／Ｄコンノ＼−夕１６から出力さ
れたディジタル信号は、比較手段、１９によって上記湿
度−露点変換テーブル２０から出力された露点Ｔ４を示
ずディジタル信号と比較され、両者の差ΔＴ（八Ｔ＝
Ｔ Ｉ Ｔ ａ ）が検出される。A digital signal outputted from the A/D controller 16 in response to the temperature T1 of the retrorefrigeration temperature detected by the temperature sensor 10 is outputted from the humidity-dew point conversion table 20 by the comparing means 19. The dew point T4 is compared with the digital signal, and the difference between the two is ΔT (8T=
T I T a ) is detected.
この差ΔＴは比較手段１９に予め設定された所定のスラ
イスレベルＳＬと比較され、ΔＴ≧ＳＬのときには電源
制御回路２１を作動させて電源２２より前記ヒータ８に
通電し、レトロリフレクタ７をカロｐＪ＞昇温せしめる
。This difference ΔT is compared with a predetermined slice level SL set in advance in the comparing means 19, and when ΔT≧SL, the power supply control circuit 21 is activated to energize the heater 8 from the power supply 22, and the retroreflector 7 is > Raise the temperature.
レトロリフレフタフの温度が十分上昇し、上貧己ΔＴが
ＳＬより大きくなったときは、ヒータ８Ｇこ対する通電
は停止される。When the temperature of the retroreflector rises sufficiently and the upper depletion ΔT becomes larger than SL, the energization to the heater 8G is stopped.
このように本実施例の大気特性測定装置におし１ては、
レトロリフレフタフ０表面温度力曵、周囲大気の露点よ
り當に高くなるよう制御されるので、従来の如くレトロ
リフレクタ７表面に結露することがなく、従って常時測
定が可能である。In this way, the atmospheric characteristic measuring device of this embodiment has the following features:
Since the surface temperature of the retroreflector 7 is controlled to be much higher than the dew point of the surrounding atmosphere, there is no condensation on the surface of the retroreflector 7 as in the conventional case, and therefore constant measurement is possible.
なお、レトロリフレフタフの温度は周囲大気の露点Ｔ４
より凡そ２ 〔℃〕以上高く保つこと力く望ましいよう
である。従って上記説明へお番するスライスレベルＳＬ
は凡そ２（’Ｃ）或しＡ６よごれ以」二に設定しておく
。In addition, the temperature of the retrorefertaff is the dew point T4 of the surrounding atmosphere.
It seems highly desirable to keep the temperature approximately 2 degrees Celsius or higher. Therefore, the slice level SL refers to the above explanation.
is set to about 2 ('C) or A6 "2".
上記一実施例では露点検知子＠２３を乾球温度と湿球温
度とを検知し、両者から露点を検出する構成としたが、
これに変えて露点検知手段２３を露点自動検知器を用い
て構成しても良いことば勿論である。In the above embodiment, the dew point detector @23 was configured to detect the dry bulb temperature and the wet bulb temperature, and detect the dew point from both.
Of course, instead of this, the dew point detection means 23 may be configured using an automatic dew point detector.
また第４図に示すレトロリフレフタフの温度制御回路中
の、湿度−露点変換テーブル２０による湿度−露点変換
、比較器１９における温度差ΔＴ検出及びΔＴに基づく
電源制御回路２１の駆動等は、実際には図示はしていな
いがマイクロプロセッサ（ＭＰＵ）を用いることにより
容易に実施し得ること、或いは湿度−露点変換テーブル
２０も読み出し専用記憶装置（ＲＯＭ）を用い、これに
必要なデータを書き込んでおけば良いこと等は、特に説
明する必要はないであろう。In addition, in the temperature control circuit of the retro-reflective temperature control circuit shown in FIG. Although not actually shown, it can be easily implemented by using a microprocessor (MPU), or the humidity-dew point conversion table 20 can also be implemented using a read-only storage device (ROM) and the necessary data can be written therein. There is no need to specifically explain things that can be done.
（ｆ） 発明の詳細 な説明した如く本発明により、大気の温度。(f) Details of the invention According to the invention, as explained above, the temperature of the atmosphere.
湿度に影響されることなく、常時測定回ｆｉｌな大気測
定装置等の光学装置が提供される。Provided is an optical device such as an atmospheric measuring device that can constantly perform measurements without being affected by humidity.
第１図は本発明に係る光学装置の一実施例としての、大
気特性測定装置の光学系の要部構成を示す断面図、第２
図は上記光学系内に設けられたレトロリフレクタを背面
側より見た斜視図、第３図は上記レトロリフレクタの温
度とその近傍の湿度を検知するためのしトロリフレクク
の構成を示す断面図、第４図は上記レトロリフレクタの
温度を結露防止可能温度に制御するための制御回路を示
すプロンク図である。
図において、７はレトロリフレクタ、８はヒータ、９は
レトロリフレフタフの表面温度を検知するための温度セ
ンサ、１０はレトロリフレクタ７近傍の大気中の湿度を
検知するための湿度センサ、１１は乾球温度検知器、１
２は湿球温度検知器、１９は比較手段、２０は湿度−露
点変換テーブル、２１は電源制御回路、２２は電源、２
３は露点検知手段を示す。
東京都千代田区内幸町１丁目１
番３号FIG. 1 is a cross-sectional view showing the main structure of an optical system of an atmospheric characteristic measuring device as an embodiment of the optical device according to the present invention, and FIG.
The figure is a perspective view of the retroreflector provided in the optical system as seen from the rear side, FIG. FIG. 4 is a diagram showing a control circuit for controlling the temperature of the retroreflector to a temperature at which condensation can be prevented. In the figure, 7 is a retroreflector, 8 is a heater, 9 is a temperature sensor for detecting the surface temperature of the retroreflector, 10 is a humidity sensor for detecting the humidity in the atmosphere near the retroreflector 7, and 11 is a Dry bulb temperature detector, 1
2 is a wet bulb temperature detector, 19 is a comparison means, 20 is a humidity-dew point conversion table, 21 is a power supply control circuit, 22 is a power supply, 2
3 indicates a dew point detection means. 1-1-3 Uchisaiwaicho, Chiyoda-ku, Tokyo
Claims (1)
学系から送出された信号光を折り返すためのレトロリフ
レクタとを備え、且つ、前記レトロリフレクタの表面温
度を検知するための表面温度検知手段と、前記レトロリ
フレクタ近傍の大気の露点・検知手段と、前記レトロリ
フレクタを加熱する手段と、レトロリフレクタの表面温
度制御手段とを具備し、前記表面温度制御手段は、前記
表面温度検知手段及び露点検知手段とにより検知された
レトロリフレクタの表面温度と大気の露点とに基づき、
前記レトロリフレクタ加熱手段を作動せしめてレトロリ
フレクタの表面温度を所望の温度に制御するように構成
されたことを特徴とする光学装置。Surface temperature detection means comprising a transmitting/receiving optical system for transmitting and receiving a predetermined signal light and a retroreflector for returning the signal light transmitted from the transmitting/receiving optical system, and for detecting a surface temperature of the retroreflector. , a means for detecting the dew point of the atmosphere near the retroreflector, a means for heating the retroreflector, and a surface temperature control means for the retroreflector, and the surface temperature control means is configured to detect the dew point and the dew point of the atmosphere near the retroreflector. Based on the surface temperature of the retroreflector detected by the detection means and the dew point of the atmosphere,
An optical device characterized in that the retroreflector heating means is activated to control the surface temperature of the retroreflector to a desired temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10829283A JPS60344A (en) | 1983-06-15 | 1983-06-15 | Optical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10829283A JPS60344A (en) | 1983-06-15 | 1983-06-15 | Optical device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60344A true JPS60344A (en) | 1985-01-05 |
Family
ID=14480973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10829283A Pending JPS60344A (en) | 1983-06-15 | 1983-06-15 | Optical device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60344A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6565738B1 (en) | 1999-01-28 | 2003-05-20 | Abbott Laboratories | Diagnostic test for the measurement of analyte in abiological fluid |
| JP2021032597A (en) * | 2019-08-19 | 2021-03-01 | 横河電機株式会社 | Gas analyzer |
-
1983
- 1983-06-15 JP JP10829283A patent/JPS60344A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6565738B1 (en) | 1999-01-28 | 2003-05-20 | Abbott Laboratories | Diagnostic test for the measurement of analyte in abiological fluid |
| JP2021032597A (en) * | 2019-08-19 | 2021-03-01 | 横河電機株式会社 | Gas analyzer |
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