JP3131958B2 - Odor measuring device - Google Patents
Odor measuring deviceInfo
- Publication number
- JP3131958B2 JP3131958B2 JP04192439A JP19243992A JP3131958B2 JP 3131958 B2 JP3131958 B2 JP 3131958B2 JP 04192439 A JP04192439 A JP 04192439A JP 19243992 A JP19243992 A JP 19243992A JP 3131958 B2 JP3131958 B2 JP 3131958B2
- Authority
- JP
- Japan
- Prior art keywords
- odor
- gas
- measured
- measurement
- odor sensor
- 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
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Sampling And Sample Adjustment (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、水晶振動子式匂いセン
サなどの匂いセンサを使用した匂い測定装置に関し、特
にベースラインのドリフトの影響を無くし、安定な測定
ができるようにした装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an odor measuring device using an odor sensor such as a quartz oscillator type odor sensor, and more particularly to an odor measuring device which eliminates the influence of drift of a baseline and enables stable measurement. It is.
【０００２】[0002]
【従来の技術】従来の匂い測定装置としては、図３に示
すような構成の装置があった。この図３に示す構成の装
置は、匂いセンサとして水晶振動子を用いたものであ
る。この水晶振動子は例えばＡＴカット水晶基板で形成
されたものであり、その表面には、金などで形成された
金属電極を介して匂い感応膜である脂質二分子膜が累積
されている。このような構成において、一般的に匂い分
子は脂質膜に吸着し易い性質を持っている。この匂いセ
ンサの脂質二分子膜に空気中の匂い物質が吸着すると、
吸着した分だけ膜の質量が増加する。これに伴って、水
晶振動子の共振周波数が低下する。この共振周波数の変
化を周波数カウンタで読み取ることにより、匂いを測定
することができる。2. Description of the Related Art As a conventional odor measuring device, there is a device having a configuration as shown in FIG. The device having the configuration shown in FIG. 3 uses a quartz oscillator as an odor sensor. The quartz resonator is formed of, for example, an AT-cut quartz substrate, and a lipid bilayer, which is an odor-sensitive membrane, is accumulated on the surface of the quartz resonator via a metal electrode formed of gold or the like. In such a configuration, odor molecules generally have a property of being easily adsorbed to a lipid membrane. When the odor substance in the air is adsorbed on the lipid bilayer of this odor sensor,
The mass of the membrane increases by the amount of the adsorbed. Along with this, the resonance frequency of the crystal oscillator decreases. By reading the change in the resonance frequency with a frequency counter, the odor can be measured.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来技術に示す構成の匂い測定装置では、匂いセンサ（水
晶振動子）は被測定ガス中に単に放置されているだけで
ある。この匂いセンサは温湿度の他、匂い感応膜の膜物
質の蒸散や酸化などによってもドリフトするため、匂い
センサのドリフトによる周波数変化と、匂い物質の吸着
による周波数変化の区別ができず、匂い物質濃度のゆる
やかな変化を測定できないという欠点があった。However, in the odor measuring device having the configuration shown in the above-mentioned prior art, the odor sensor (quartz oscillator) is simply left in the gas to be measured. This odor sensor drifts not only due to temperature and humidity, but also due to evaporation or oxidation of the odor-sensitive film material. There is a drawback that a gradual change in concentration cannot be measured.
【０００４】本発明は上記従来技術の課題を踏まえて成
されたものであり、標準空気と被測定ガスの切替えがで
きる構造をとるとともに、脱臭装置を通った被測定ガス
を標準空気とすることにより、匂いセンサのドリフトの
影響を受けずに簡単な構成で正確に匂い物質濃度を測定
できる匂い測定装置を提供することを目的としたもので
ある。The present invention has been made in view of the above-mentioned problems of the prior art, and has a structure capable of switching between standard air and a gas to be measured.
The by to Rukoto and the standard air is intended to provide an odor measurement device capable of measuring accurately odorant concentration without being affected by the drift of the odor sensor with a simple structure.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
の本発明の構成は、匂いセンサと、この匂いセンサの出
力を測定する測定回路と、前記匂いセンサがその内部に
設置された測定セルと、被測定ガス採取装置と、前記被
測定ガス採取装置に接続され被測定ガスから匂い物質を
取り除く脱臭装置と、前記脱臭装置と被測定ガス採取装
置の途中に接続され脱臭装置を通ったガスと被測定ガス
の何れか一方のガスを選択して前記測定セルに導入する
切替バルブと、前記測定セルに接続されガス流量を一定
に保つためのポンプとを備えた構成としたことを特徴と
する。また、前記匂いセンサとして、水晶振動子式匂い
センサを用いたことを特徴とする。According to the present invention, there is provided an odor sensor, a measuring circuit for measuring an output of the odor sensor, and a measuring cell in which the odor sensor is installed. When the measurement gas sampling apparatus, the object to be
It is connected to the measurement gas sampling device and removes odor substances from the gas to be measured.
The deodorizing device to be removed, the deodorizing device and the measured gas sampling device
Gas and gas to be measured that are connected in the middle of
A switching valve for introducing into the measurement cell by selecting one of the gases, characterized by being configured to the connected gas flow in the measuring cell and a pump for keeping constant. Also, a quartz oscillator type odor sensor is used as the odor sensor.
【０００６】[0006]
【作用】本発明によれば、脱臭装置に被測定ガスを通す
ことにより標準空気を作製し、この標準空気と被測定ガ
スの切替えができる構成としているので、被測定ガスの
測定直前に温度や湿度が同等の標準空気を用いてゼロ点
を測定することができるため、匂いセンサのベースライ
ンのドリフトの影響を受けずに匂い物質の測定ができ
る。According to the present invention, the gas to be measured is passed through the deodorizing device.
This makes it possible to create standard air and switch between this standard air and the gas to be measured, so that the zero point can be measured using standard air with the same temperature and humidity immediately before the measurement of the gas to be measured. Therefore, the odor substance can be measured without being affected by the drift of the baseline of the odor sensor.
【０００７】[0007]
【実施例】以下、本発明を図面に基づいて説明する。図
１は本発明の匂い測定装置の一実施例を示す構成図であ
る。図１において、１は被測定ガス採取装置、２は標準
空気供給装置であり、図では被測定ガス採取装置２に接
続され、被測定ガスから匂い物質を取り除く脱臭装置を
用いている。３は測定セル、４は切替バルブであり、被
測定ガス採取装置１と標準空気供給装置２に接続され、
何れか一方のガスを選択して測定セル３に導入する。５
は測定セル３の内部に設置された匂いセンサであり、図
では水晶振動子式匂いセンサを用いている。６は水晶振
動子式匂いセンサ５の共振周波数変化を測定する測定回
路、７はガス流量を一定に保つための吸引ポンプであ
る。なお、各装置はパイプ（図中の二重線）または導線
（図中の実線）で接続されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of the odor measuring device of the present invention. In FIG. 1, reference numeral 1 denotes a gas sampling device to be measured, and 2 denotes a standard air supply device. In the figure, a deodorizing device connected to the gas sampling device 2 to remove odorous substances from the gas to be measured is used. 3 is a measurement cell, 4 is a switching valve, which is connected to the measured gas sampling device 1 and the standard air supply device 2,
One of the gases is selected and introduced into the measurement cell 3. 5
Denotes an odor sensor installed inside the measurement cell 3, and uses a quartz oscillator type odor sensor in the figure. Reference numeral 6 denotes a measurement circuit for measuring a change in the resonance frequency of the crystal oscillator type odor sensor 5, and reference numeral 7 denotes a suction pump for keeping the gas flow rate constant. Each device is connected by a pipe (double line in the figure) or a conductor (solid line in the figure).
【０００８】このような構成において、測定開始時、切
替バルブ４は図２に示すバルブ位置ａの状態であり、吸
引ポンプ７を動作させると、図１中の矢印で示すような
空気の流れが測定装置全体に生じる。この時、被測定ガ
ス採取装置１によって集められた被測定ガスは、切替バ
ルブ４を通って標準空気供給装置２に導入され、この標
準空気供給装置２で匂い物質を除去されて標準空気とな
り、再び切替バルブ４を通して測定セル３に導入され、
さらに吸引ポンプ７を通して排気される。つまり、測定
セル３中に設置された水晶振動子式匂いセンサ５は、匂
いのない標準空気にさらされており、その時の共振周波
数ｆ0が測定回路６によって測定される。In such a configuration, at the start of measurement, the switching valve 4 is in the state of the valve position a shown in FIG. 2, and when the suction pump 7 is operated, the flow of air as shown by the arrow in FIG. Occurs throughout the measuring device. At this time, the measured gas collected by the measured gas sampling device 1 is introduced into the standard air supply device 2 through the switching valve 4, and the standard air supply device 2 removes odorous substances to become standard air. It is again introduced into the measuring cell 3 through the switching valve 4,
Further, the air is exhausted through the suction pump 7. That is, the quartz oscillator type odor sensor 5 installed in the measurement cell 3 is exposed to standard air having no odor, and the resonance frequency f 0 at that time is measured by the measurement circuit 6.
【０００９】次に、切替バルブ４を図２に示すバルブ位
置ｂの状態に切り替えると、被測定ガス採取装置１から
取り込まれた被測定ガスは、標準空気供給装置２を通ら
ずに測定セル３に導入され、その時の水晶振動子式匂い
センサ５の共振周波数ｆ1が同様に測定回路６によって
測定される。Next, when the switching valve 4 is switched to the state of the valve position b shown in FIG. 2, the measured gas taken in from the measured gas sampling device 1 does not pass through the standard air supply device 2 and the measurement cell 3 The resonance frequency f 1 of the quartz oscillator type odor sensor 5 at that time is similarly measured by the measuring circuit 6.
【００１０】この両出力の被測定ガス中の匂い成分によ
る水晶振動子式匂いセンサ５の出力Δｆは、 Δｆ＝ｆ1−ｆ0 によって与えられる。The output Δf of the quartz oscillator type odor sensor 5 due to the odor component in the gas to be measured having both outputs is given by Δf = f 1 −f 0 .
【００１１】測定は常にステップ応答測定によって行わ
れ、匂い成分測定の直前に、ゼロ点（ｆ0）を測定して
いるため、ベースラインのドリフトの影響を受けること
はない。The measurement is always performed by the step response measurement. Since the zero point (f 0 ) is measured immediately before the measurement of the odor component, the measurement is not affected by the drift of the baseline.
【００１２】このように、上記実施例によれば、被測定
ガスを脱臭装置を通すことにより標準空気を作製し、こ
の標準空気と被測定ガスの切替えができる構成としてい
るので、被測定ガスの測定直前に温度や湿度が同等の標
準空気を用いてゼロ点を測定することができるため、匂
いセンサのベースラインのドリフトの影響を受けずに匂
い物質の測定ができる。また、ガス流量を一定に保つた
めの吸引ポンプを使用しているため、ガス流量変動の影
響も受けずに測定ができる。As described above, according to the above embodiment, the measured
The standard air is created by passing the gas through a deodorizer,
Because of the standard air it has a configuration capable of switching of the measurement gas, standard temperature and humidity equal to just before the measurement of the measurement gas
Since the zero point can be measured using the quasi-air , the odor substance can be measured without being affected by the drift of the baseline of the odor sensor. Further, since a suction pump for keeping the gas flow rate constant is used, measurement can be performed without being affected by fluctuations in the gas flow rate.
【００１３】なお、上記実施例では、匂いセンサとして
水晶振動子式匂いセンサを用いたが、これに限定される
ものではなく、酸化物半導体式匂いセンサなどを用いる
こともできる。In the above embodiment, a quartz oscillator type odor sensor is used as the odor sensor. However, the present invention is not limited to this, and an oxide semiconductor type odor sensor may be used.
【００１４】[0014]
【発明の効果】以上、実施例と共に具体的に説明したよ
うに、本発明によれば、匂いセンサのドリフトの影響を
受けずに正確に匂い物質濃度を測定でき、標準空気源を
別に設ける必要がないので構成が簡単な匂い測定装置を
実現できる。As described above in detail with the embodiments, according to the present invention, the odor substance concentration can be accurately measured without being affected by the drift of the odor sensor , and the standard air source can be used.
Since there is no need to provide a separate odor measuring device, an odor measuring device having a simple configuration can be realized.
【図１】本発明の匂い測定装置の一実施例を示す構成図
である。FIG. 1 is a configuration diagram showing one embodiment of an odor measuring device of the present invention.
【図２】図１装置の切替バルブの切替状態を示す図であ
る。FIG. 2 is a diagram showing a switching state of a switching valve of the apparatus in FIG. 1;
【図３】従来の匂い測定装置の一例を示す構成図であ
る。FIG. 3 is a configuration diagram showing an example of a conventional odor measuring device.
１ 被測定ガス採取装置 ２ 標準空気供給装置（脱臭装置） ３ 測定セル ４ 切替バルブ ５ 水晶振動子式匂いセンサ ６ 測定回路 ７ 吸引ポンプ REFERENCE SIGNS LIST 1 Gas sampling device to be measured 2 Standard air supply device (deodorizing device) 3 Measurement cell 4 Switching valve 5 Crystal oscillator type odor sensor 6 Measurement circuit 7 Suction pump
Claims (2)
定する測定回路と、前記匂いセンサがその内部に設置さ
れた測定セルと、被測定ガス採取装置と、前記被測定ガ
ス採取装置に接続され被測定ガスから匂い物質を取り除
く脱臭装置と、前記脱臭装置と被測定ガス採取装置の途
中に接続され脱臭装置を通ったガスと被測定ガスの何れ
か一方のガスを選択して前記測定セルに導入する切替バ
ルブと、前記測定セルに接続されガス流量を一定に保つ
ためのポンプとを備えた構成としたことを特徴とする匂
い測定装置。1. An odor sensor, a measurement circuit for measuring an output of the odor sensor, a measurement cell in which the odor sensor is installed, a gas sampling device to be measured, and a gas sensor to be measured.
Connected to a gas sampling device to remove odor substances from the gas to be measured
Between the deodorizing device, the deodorizing device and the measured gas sampling device.
Pump for keeping the switching valve to be introduced into the measurement cell by selecting a connected one of the gas passing through the deodorizing device gas and measurement gas while, the connected gas flow into the measurement cell constant An odor measuring device characterized by comprising:
記匂いセンサとして、水晶振動子式匂いセンサを用いた
ことを特徴とする匂い測定装置。2. The odor measuring device according to claim 1, wherein a quartz oscillator type odor sensor is used as said odor sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04192439A JP3131958B2 (en) | 1992-07-20 | 1992-07-20 | Odor measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04192439A JP3131958B2 (en) | 1992-07-20 | 1992-07-20 | Odor measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0634508A JPH0634508A (en) | 1994-02-08 |
| JP3131958B2 true JP3131958B2 (en) | 2001-02-05 |
Family
ID=16291327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04192439A Expired - Fee Related JP3131958B2 (en) | 1992-07-20 | 1992-07-20 | Odor measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3131958B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5294124B2 (en) * | 2009-05-25 | 2013-09-18 | 清水建設株式会社 | Gas monitoring device and gas monitoring method |
-
1992
- 1992-07-20 JP JP04192439A patent/JP3131958B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0634508A (en) | 1994-02-08 |
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