JPS59128432A - Gas concentration measuring device - Google Patents
Gas concentration measuring deviceInfo
- Publication number
- JPS59128432A JPS59128432A JP471283A JP471283A JPS59128432A JP S59128432 A JPS59128432 A JP S59128432A JP 471283 A JP471283 A JP 471283A JP 471283 A JP471283 A JP 471283A JP S59128432 A JPS59128432 A JP S59128432A
- Authority
- JP
- Japan
- Prior art keywords
- light
- signal
- condensation
- light source
- reference cell
- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Spectroscopy & Molecular Physics (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)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はガス濃度測定装置、特にＨｅ −Ｎ ｅ赤外レ
ーザ管を光源とし、この光源からの光を２つに分割して
、それぞれ試料光及び参照光とし、これらを被測定ガス
及び参照ガスをそれぞれ流入させた試料セμ及び参照セ
ルに入射せしめ、両セルからの通過光強度を比較するこ
とによシ被測定ガスの濃度を測定するガス濃度測定装置
に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention uses a gas concentration measuring device, particularly a He-Ne infrared laser tube as a light source, and divides the light from this light source into two parts, each of which is a sample light and a sample light. The concentration of the gas to be measured is measured by making the reference light incident on a sample cell and a reference cell into which the gas to be measured and the reference gas have respectively flowed, and comparing the intensity of the light passing from both cells. This invention relates to a concentration measuring device.
従来技術
光源にＨｅ −Ｎ ｅガスレーザを用いた赤外吸光法に
よるガス濃度測定装置にあっては、光源、試料セル及び
参照七〜等光学系装置又は光路に配置される装置は、そ
の測定雰囲気温度を一定に保つために恒温槽内に収納し
て使用されることが多い。In a conventional gas concentration measuring device using an infrared absorption method using a He-Ne gas laser as a light source, the light source, sample cell, reference optical system device, or device placed in the optical path is controlled by the measurement atmosphere. It is often stored in a constant temperature bath to keep the temperature constant.
このような恒温槽を使用する場合、恒温槽の設定温度を
変化させると試料セル及び参照セルの入射窓及び／若し
くは出射窓に結露を生じることがあり、これによシ赤外
レーザ光の通過が妨けられ、受光素子に入射する光の強
度が著しく低下し、測定精度の低下、或は誤動作の原因
となっている。When using such a constant temperature chamber, changing the set temperature of the constant temperature chamber may cause condensation on the entrance and/or exit windows of the sample cell and reference cell, which may prevent the passage of infrared laser light. As a result, the intensity of light incident on the light-receiving element is significantly reduced, causing a reduction in measurement accuracy or malfunction.
発明の目的
本発明は、セル窓へ結露が生じたとき、これを検知し、
かつ警報を発して使用者に知らしめ装置の誤動作、精度
低下等異常の発生を未然に防止する仁とを目的とする。Purpose of the Invention The present invention detects when dew condensation occurs on the cell window,
The purpose of the system is to issue an alarm to inform the user and prevent abnormalities such as malfunctions and decreased accuracy of the device.
発明の構成
本発明は、試料セル及び参照セルの各々に光を入射する
２光線方式のガス濃度測定装置において、参照セルの通
過光信号から温度変動分を除去する温度補正手段と、こ
の温度補正手段にて補正された信号を、所定の基準値と
比較し、基準値よシ低いとき信号を出力して参照セルの
窓に結露が発生したことを知らせる結露発生報知信号出
力手段と、この出力手段からの信号を受けて警報を発す
る結露警報手段とを、主構成要素とする。Structure of the Invention The present invention provides a two-beam type gas concentration measuring device in which light is incident on each of a sample cell and a reference cell, and includes a temperature correction means for removing temperature fluctuations from a light signal passing through the reference cell, and a temperature correction means for removing temperature fluctuations from a light signal passing through the reference cell. a condensation occurrence notification signal output means for comparing the signal corrected by the means with a predetermined reference value and outputting a signal when the signal is lower than the reference value to notify that condensation has occurred on the window of the reference cell; The main component is a condensation alarm means that issues an alarm upon receiving a signal from the means.
実施例
第１図において、（１）はＨｅ−Ｎｅガヌレーザ管、（
２）は炭化水素系ガスが被測定ガスとして流入された試
料セル、（３）はレーザ光を吸収しないガス例えば窒素
ガスが流入された参照セルで、両セ／１’＋２＋＋３１
とも前後に光入射窓１＜ １ ［４）及び光出射窓（５
）（５）を備え、この窓を通ってレーザ光（図中一点鎖
線で示す）は通過する。（６＋ ＋７１は、各セ／ｌ／
（２１＋３１の通過光が入射する受光素子で、これらの
各構成部分は、恒温槽（８）内に配置される。（９）は
恒温槽（８）内の温度を検知する温度検知素子、ｆｌｏ
ｌ（ＩＩＩα匂は、受光素子＋６）（７１及び温度検知
素子（９）からの出力信号を増幅する増幅器で、それぞ
れ出力信号Ｖ８１ Ｇ 、 ＶＲＥＦ 、 Ｖ’ｌ’Ｍ
Ｐを得る。Example In FIG. 1, (1) is a He-Ne Gunnu laser tube, (
2) is a sample cell into which a hydrocarbon gas was introduced as a gas to be measured, and (3) is a reference cell into which a gas that does not absorb laser light, such as nitrogen gas, is introduced.
Both have a light entrance window 1 < 1 [4] and a light exit window (5
) (5), and the laser light (indicated by the dashed line in the figure) passes through this window. (6+ +71 is each cell/l/
(A light receiving element on which the passing light of 21+31 enters, and each of these components is placed in a thermostatic oven (8). (9) is a temperature detection element that detects the temperature inside the thermostatic oven (8), flo
l (IIIα) is an amplifier that amplifies the output signals from the light receiving element +6 (71) and the temperature sensing element (9), and outputs signals V81 G, VREF, and V'l'M, respectively.
Get P.
第２図において、＋７１ ＋９１は前述した受光素子及
び温度検知素子、さらに（＋１！（１２）は増幅器であ
る。受光素子（７）の感度即ち出力電圧は、第８図に示
す如く、温度による影普を受け、温度上昇に反比例して
出力電圧が低下する。それ故、受光素子（７）の出力電
圧信号からの温度変動分を除去するために以下のような
操作がなされる。即ち、増幅器（Ｉｌｌの出力信号−２
Ｔ＋ｂ（ａ、ｂは定数、Ｔは温度）に対し、他方の増幅
器（Ｉ２１からの出力をＨ’ｒに設定し、両信号を抵抗
（Ｒ１）（Ｒ２）を介してｆＪＱ舞し、差動増幅器（１
３）のｅ側端子に入力する。この差動増幅器（１：ｌｌ
ｌの■側端子Ｆｉ接地レベルにある。差動増幅器α３）
の出力には、温度変動分を取り除かれた一定値−ｂが得
られ、この信号は比較器０４，１の■側端子に入力され
る。In Fig. 2, +71 and +91 are the aforementioned light receiving element and temperature sensing element, and (+1! (12) is an amplifier. The sensitivity of the light receiving element (7), that is, the output voltage, depends on the temperature as shown in Fig. 8. As a result, the output voltage decreases in inverse proportion to the temperature rise.Therefore, the following operation is performed to remove the temperature fluctuation from the output voltage signal of the light receiving element (7). Amplifier (Ill output signal -2
For T+b (a, b are constants, T is temperature), the output from the other amplifier (I21 is set to H'r, both signals are applied fJQ through resistors (R1) (R2), and a differential Amplifier (1
Input to the e side terminal of 3). This differential amplifier (1:ll
■ side terminal Fi of l is at ground level. Differential amplifier α3)
A constant value -b from which temperature fluctuations are removed is obtained as the output of , and this signal is input to the - side terminals of the comparators 04 and 1.
（１５）は比較器（ｌ（１）のｅ側端子に基準電位−Ｅ
ｌを与える電源である。参照セ１ｖ（３１の窓［４１［
５１に結露を生じていない正常状態では、差動増幅器０
３）の出力−すは比較的大きい電位を示すから、基準値
−Ｅｌよりも大きく、それ故比較器（１４１の出力は１
′Ｈ〃の状態にある。然しなから、参照上μｆ３１の窓
（４）及び／若しくは（５）に結露を発生すると、受光
素子（７）出力信号の電位は低下するから、信号−すの
電位もまた低くカリ、基準値−Ｅ□よυ小さい値となる
。これよシ比較器θ４ｊの出力は１ゝＬ〃レベルに変９
、結露が発生したことを知らせる報知信号となる。この
報知信号によシ、警報表示、警報ブザー等警報装置１（
Ｉｎを動作させることによって、一応所期の目的を達成
することもできるが、さらに、レーザ管（１）の動作状
態を監視しておき、それが正常動作状態にあってかつ結
露警報信号が発生したとき、警報を発するよう構成すれ
ば、より確実に結露の発生を知ることができる。なせな
ら、かかるレーザ管監視手段を設はガい場合、レーザ管
ｔ１）が放電停止したとき警報回路θ６）が動作し、結
露発生と誤認してしまうおそれがあるからである。(15) is a reference potential -E to the e-side terminal of the comparator (l(1)).
It is a power source that provides l. Reference se1v (window of 31 [41[
Under normal conditions with no condensation on 51, the differential amplifier 0
Since the output of 3) shows a relatively large potential, it is larger than the reference value -El, and therefore the output of the comparator (141) is 1.
It is in the 'H' state. However, if condensation occurs on the window (4) and/or (5) of μf31 for reference, the potential of the output signal of the light receiving element (7) will decrease, so the potential of the signal will also be low and will not reach the reference value. −E□ is υ smaller value. Now, the output of comparator θ4j changes to 1ゝL〃level9
, which serves as a notification signal to notify that condensation has occurred. According to this notification signal, an alarm device 1 (such as alarm display, alarm buzzer, etc.)
The desired purpose can be achieved by operating In, but it is also necessary to monitor the operating status of the laser tube (1) and make sure that it is in normal operating condition and that a condensation alarm signal is generated. By configuring the device to issue an alarm when this happens, you can more reliably know that condensation has occurred. Otherwise, if such a laser tube monitoring means is not installed, the alarm circuit θ6) will be activated when the laser tube t1) stops discharging, and there is a risk that it will be mistaken for dew condensation.
レーザ管（１）の動作監視手段につき第２図に基いて説
明すると、（１）はレーザ管、θ７）は、その駆動電源
、（Ｒ８）は電源０７１一端側に接続された抵抗である
。（Ｉ８）は、抵抗（Ｒ８）端子間に現われる電圧信号
がｅ側端子に入力される比較器で、■側端子には、基準
電圧−Ｒ２が与えられる。比較器（１８）の出力は、前
述した比較器（１４）の出力とともにインバータ（Ｉ９
）（２０＋を介してアンドゲート（２１ｉに入力し、さ
らにこのアンドグー） （２１ｉの出力は警報装置０６
）に印加される。The operation monitoring means for the laser tube (1) will be explained based on FIG. 2. (1) is the laser tube, θ7) is its driving power source, and (R8) is a resistor connected to one end of the power source 071. (I8) is a comparator to which the voltage signal appearing between the resistor (R8) terminals is input to the e-side terminal, and the reference voltage -R2 is applied to the ■-side terminal. The output of the comparator (18) is sent to the inverter (I9) together with the output of the comparator (14) described above.
) (via 20+ and gate (input to 21i, and this AND gate) (output of 21i is alarm device 06
) is applied to
その動作につき説明すると、レーザ管［１）が正常に動
作しているときは、放電々流が流れるため抵抗（Ｒ８）
を流れる電流ＩＬの値は比較的大きい。それ故抵抗（Ｒ
８）端子間電圧は、基準電圧を−Ｅ２より大きい値とな
シ、比較器Ｏａ＋の出力はゝゝＬ ／／ レベルにあ
る。他方、レーザ管＋１＋の放電が停止すると電流は、
セロ或は減少するから、抵抗（Ｒ８）端子電圧は低下し
、基準電圧−Ｒ２以下となり、比較器管（１１の動作が
正常であって参照セル（３）に結露を生じた場合には、
比較器（１４バｉ８）の出力はゝゝＬ ／／ １ゝＬ
ＬＬ、したがってアントゲ−） （２１Ｈの入力は、１
１ ＨＩＩ １ゝＨ″ となシその出力にゝゝＨ” レ
ベル信号を得る。このときに限り警報装＆（＋６ｉを動
作させる構成とすれば、結露のみを確実に検知すると舌
ができる。尚、第２図中、測定信号の処理回路について
は、既に公知のものが使用されるからその説明は省略し
ている。To explain its operation, when the laser tube [1] is operating normally, the resistance (R8)
The value of the current IL flowing through is relatively large. Therefore the resistance (R
8) For the voltage between the terminals, set the reference voltage to a value greater than -E2, and the output of the comparator Oa+ is at the ゝゝL// level. On the other hand, when the discharge of laser tube +1+ stops, the current is
As the voltage decreases, the voltage at the terminal of the resistor (R8) decreases and becomes below the reference voltage -R2, and if the comparator tube (11) operates normally and condensation occurs on the reference cell (3),
The output of the comparator (14 by i8) is ゝゝL // 1ゝL
LL, therefore Antogame) (The input of 21H is 1
1 HII 1ゝH'' and a ``H'' level signal is obtained at its output. If the configuration is such that the alarm device & (+6i is operated only at this time), a tongue will appear if only dew condensation is reliably detected.In addition, as for the measurement signal processing circuit in Fig. 2, a known one is used. Therefore, the explanation is omitted.
発明の効果
本発明は、セルの窓に生じた結露を既存の信号、即ち参
照セル通過光信号、温度検知信号及びレーザ管電流信号
から簡単な付加回路を通して結露状態を検知するもので
あるから、固有の結露センサ及びその関連回路を不要と
することができる。Effects of the Invention The present invention detects dew condensation formed on a cell window using existing signals, that is, a reference cell passing light signal, a temperature detection signal, and a laser tube current signal, through a simple additional circuit. A unique condensation sensor and its associated circuitry can be eliminated.
第１図は、本発明実施例における光路糸を示すブロック
図、第２図は同側回路ブロック図、第３図は、受光素子
出力電圧の温度特性図である。FIG. 1 is a block diagram showing an optical path in an embodiment of the present invention, FIG. 2 is a block diagram of the same-side circuit, and FIG. 3 is a temperature characteristic diagram of the light receiving element output voltage.
Claims (2)
を流入させた試料セル、同様に上記光源からの光が通過
し該光による吸収を受けないガスを流入させた参照セ／
Ｌ”ｌｉ−備え、上記両セルの通過光強度を比較して、
被測定ガスの濃度を測定するガス濃度測定装置において
、上記参照セルの通過光信号を周囲温度に応じて補正し
、該信号の温度による影獅を除去する温度補正手段、該
温度補正手段を経て出力された参照セル通過光信号を予
め設定された基準値上比較し、該基準値以下と判定され
たとき信号を出力し上記参照セルの光入射窓及び／若し
くは光出射窓に結露が発生したことを知らせる結露発生
報知信号出力手段、該信号出力手段からの信号を受けて
実際に警報動作する結ｉ！瞥報手段を備えたことを特徴
とするガス濃度測定装置。(1) A light source, a sample cell into which a gas to be measured through which light from the light source passes passes, and a reference cell into which a gas through which light from the light source passes and which is not absorbed by the light is introduced.
Comparing the transmitted light intensities of both cells,
In a gas concentration measuring device for measuring the concentration of a gas to be measured, a temperature correction means for correcting the light signal passing through the reference cell according to the ambient temperature and removing the influence of temperature on the signal; The outputted reference cell passing light signal is compared with a preset reference value, and when it is determined that the signal is less than the reference value, a signal is output and dew condensation has occurred on the light entrance window and/or the light exit window of the reference cell. Condensation occurrence alarm signal output means to notify that condensation has occurred, and a condensation alarm signal output means that actually operates an alarm upon receiving the signal from the signal output means. A gas concentration measuring device characterized by comprising a visual report means.
入させた試料上μ、同様に上記光源からの光が通過し該
光による吸収を受けないガスを流入させた参照セルを備
え、上記両セルの通過光強度を比較して、被測定ガスの
濃度を測定するガス濃度測定装置において、上記参照セ
ルの通過光信号を周囲温度に応じて補正し、該信号の温
度による影蕾を除去する温度補正手段、該温度補正手段
を経て出力された参照セル通過光信号を予め設定された
基準値と比較し、該基準値以下と判定されたとき信号を
出力し、上記参照セルの光入射窓及び／若しくは光出射
窓に結露が発生したことを知らせる結露発生報知信号出
力手段、上記光源の作動状態を監視し、正箔動作してい
るとき出力を生じる光源動作検知信号出力手段、上記結
露発生報知信号出力手段からの信号と上記光源動作検知
信号出力手段からの信号を２人力とするアンドゲート手
段、該アンドゲート手段からの信号によシ動作し結露警
報を発生する結露賢報手段を備えたことを特徴とするガ
ス濃度測定装置。(2) A light source, a sample cell into which the force to be measured through which the light from the light source passes, μ, and a reference cell into which a gas through which the light from the light source passes and which is not absorbed by the light is similarly introduced. In a gas concentration measuring device that measures the concentration of a gas to be measured by comparing the intensity of light passing through the two cells, the light signal passing through the reference cell is corrected according to the ambient temperature, and the influence of the temperature on the signal is corrected. A temperature correction means for removing buds, a reference cell passing optical signal outputted through the temperature correction means is compared with a preset reference value, and when it is determined that the light signal is less than or equal to the reference value, a signal is output, and the reference cell a condensation occurrence alarm signal output means for notifying the occurrence of condensation on the light entrance window and/or the light exit window; and a light source operation detection signal output means for monitoring the operating state of the light source and generating an output when the light source is in normal foil operation. , an AND gate means for manually generating a signal from the condensation occurrence notification signal output means and a signal from the light source operation detection signal output means; and a condensation sensor for generating a condensation alarm by operating in response to the signal from the AND gate means. A gas concentration measuring device characterized by comprising a reporting means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP471283A JPS59128432A (en) | 1983-01-13 | 1983-01-13 | Gas concentration measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP471283A JPS59128432A (en) | 1983-01-13 | 1983-01-13 | Gas concentration measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59128432A true JPS59128432A (en) | 1984-07-24 |
Family
ID=11591492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP471283A Pending JPS59128432A (en) | 1983-01-13 | 1983-01-13 | Gas concentration measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59128432A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6258383A (en) * | 1985-09-09 | 1987-03-14 | Dan Kagaku:Kk | Automatic measuring instrument for floating fine grain |
| JPH054579A (en) * | 1991-04-26 | 1993-01-14 | Hitachi Ltd | Vehicle and manufacture thereof |
| WO2019039149A1 (en) * | 2017-08-23 | 2019-02-28 | 株式会社デンソー | Air-conditioning control device |
| WO2019039137A1 (en) * | 2017-08-25 | 2019-02-28 | 株式会社デンソー | Vehicle air conditioning apparatus |
| JP2019038523A (en) * | 2017-08-25 | 2019-03-14 | 株式会社デンソー | Vehicle air conditioning device |
-
1983
- 1983-01-13 JP JP471283A patent/JPS59128432A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6258383A (en) * | 1985-09-09 | 1987-03-14 | Dan Kagaku:Kk | Automatic measuring instrument for floating fine grain |
| JPH054579A (en) * | 1991-04-26 | 1993-01-14 | Hitachi Ltd | Vehicle and manufacture thereof |
| WO2019039149A1 (en) * | 2017-08-23 | 2019-02-28 | 株式会社デンソー | Air-conditioning control device |
| CN111032388A (en) * | 2017-08-23 | 2020-04-17 | 株式会社电装 | Air conditioner control device |
| WO2019039137A1 (en) * | 2017-08-25 | 2019-02-28 | 株式会社デンソー | Vehicle air conditioning apparatus |
| JP2019038523A (en) * | 2017-08-25 | 2019-03-14 | 株式会社デンソー | Vehicle air conditioning device |
| CN111032389A (en) * | 2017-08-25 | 2020-04-17 | 株式会社电装 | Air conditioner for vehicle |
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