JP5170704B2 - Gas measuring device placed in an enclosed space - Google Patents

Gas measuring device placed in an enclosed space Download PDF

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JP5170704B2
JP5170704B2 JP2009260573A JP2009260573A JP5170704B2 JP 5170704 B2 JP5170704 B2 JP 5170704B2 JP 2009260573 A JP2009260573 A JP 2009260573A JP 2009260573 A JP2009260573 A JP 2009260573A JP 5170704 B2 JP5170704 B2 JP 5170704B2
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和俊 野田
秀信 愛澤
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National Institute of Advanced Industrial Science and Technology AIST
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Description

本発明は、例えば、タンク、コンテナ、容器、貨物室等の密閉空間内の各種ガス成分を検知し、その経時的な環境条件、環境変化を検知するガス計測装置に関するものである。   The present invention relates to a gas measuring device that detects various gas components in a sealed space such as a tank, a container, a container, and a cargo compartment, and detects environmental conditions and environmental changes over time.

従来から、空間内の各種ガス成分を検知するため、さまざまな検知素子が利用されている。
一般的に広く利用されているガス検知素子としては、フィラメントタイプで検知用素子と参照用素子の表面に酸化スズを主成分とした触媒を担持させた半導体式センサが挙げられる。
この検知素子を、公知のホーイストンブリッジ回路の両極に取り付け、残りの2極に公知の一般的な電気抵抗を取り付け、この回路内の抵抗変化、つまり流れる電流値の変化を高感度に検出する回路を備えている。
Conventionally, various detection elements are used to detect various gas components in the space.
As a gas detection element which is generally widely used, there is a semiconductor type sensor in which a catalyst mainly composed of tin oxide is supported on the surfaces of a detection element and a reference element in a filament type.
This sensing element is attached to both poles of a known Hoyston bridge circuit, and a known general electrical resistance is attached to the remaining two poles, and resistance changes in this circuit, that is, changes in flowing current values are detected with high sensitivity. It has a circuit.

ここで、この検知素子をヒーターによって加熱し活性化させ、測定対象ガスが検知用素子に接触することによって、流れる電流値が変化し、その変化量からガス濃度に変換するものであり、この素子は非常に小型で安価、高感度であるため多くのガス測定分野で利用されている。   Here, the detection element is heated and activated by a heater, and when the gas to be measured comes into contact with the detection element, the value of the flowing current changes, and the change amount is converted into a gas concentration. Is very small, inexpensive and highly sensitive, and is used in many gas measurement fields.

しかし、このようなガス検知素子は、消費電力が多いため、商用電力の確保が困難な環境ではアルカリ電池やニッケル水素に代表される充放電可能な2次電池を使用しなければならないが、このような電池を用いても、長期間にわたるガス検知は困難である。
そのため、長時間利用する場合は動作時間に必要な容量を確保しなければならないため、電池の容量が大きくなり、コストアップを招くとともに、センサ本体の大型化を余儀なくされ、限られた密閉空間内に配置することは困難である。
However, since such a gas detection element consumes a large amount of power, it is necessary to use a chargeable / dischargeable secondary battery represented by an alkaline battery or nickel metal hydride in an environment where it is difficult to secure commercial power. Even if such a battery is used, gas detection over a long period of time is difficult.
Therefore, when using for a long time, it is necessary to secure the capacity necessary for the operation time, which increases the capacity of the battery, which increases the cost and necessitates an increase in the size of the sensor body. Is difficult to place.

また、この種のガス検知素子は、その動作原理から酸素又は燃焼性ガスが必要であり、特にタンク、コンテナ、容器、貨物室等の密閉空間内のガス成分を検出する場合、検知素子自身が微量ながら酸素や他の気体を消費し、微量ではあるものの排気ガス成分が発生するため、密閉空間内のガス成分が、当初と比較して変化し、特に高精度にガス成分を分析する必要がある場合、検出値に誤差が生じるおそれがある。   In addition, this type of gas detection element requires oxygen or combustible gas because of its operating principle. In particular, when detecting gas components in a sealed space such as a tank, container, container, cargo compartment, etc., the detection element itself Oxygen and other gases are consumed in a small amount, but a small amount of exhaust gas component is generated. Therefore, the gas component in the sealed space changes compared to the original, and it is necessary to analyze the gas component particularly with high accuracy. In some cases, an error may occur in the detected value.

特に密閉空間の体積(容量)が小さくなるほど、この影響が大きくなり、この密閉空間内に発生する特定ガスの変化量を正確に検知することが困難になる。   In particular, this effect increases as the volume (capacity) of the sealed space decreases, and it becomes difficult to accurately detect the amount of change in the specific gas generated in the sealed space.

一方、ガス検知素子として、下記特許文献1ないし5にみられるように、水晶振動子の電極表面または電極金属そのものを検出部とし、この電極表面に対する物質の吸脱着現象を発振周波数の周波数変化に変換する、いわゆるQCMセンサ(水晶振動子センサ)が提案されている。   On the other hand, as seen in the following Patent Documents 1 to 5, as a gas detection element, the electrode surface of the crystal resonator or the electrode metal itself is used as a detection unit, and the adsorption / desorption phenomenon of a substance on the electrode surface is changed to a change in oscillation frequency. A so-called QCM sensor (quartz crystal sensor) for conversion has been proposed.

この種の水晶振動子センサは、水晶の表面、又は水晶を挟む金属で形成した電極の表面に何らかの物質が付着すると、その質量の変化によって水晶の周波数特性が変化することを利用しており、その表面に特定の気体成分等、付着特性に選択性のある膜を形成して、特定の物質を検出したり、含有率を計測したりすることも行われている。   This type of quartz crystal sensor uses the fact that when a substance adheres to the surface of a crystal or the surface of an electrode made of a metal that sandwiches the crystal, the frequency characteristics of the crystal change due to the change in its mass. A film having selectivity in adhesion characteristics such as a specific gas component is formed on the surface, and a specific substance is detected or a content rate is measured.

また、上記特許文献5では、一般的な温湿度素子で測定した結果をもとに、演算回路により温度及び湿度の影響を除外するための補正演算を行って、ガス濃度を測定する手法も提案されている。
一般に、こうした水晶振動子センサは、低電力で長期間駆動可能な水晶振動子を採用していることから、小容量の電源でも、長期間にわたり計測が可能である。
Further, the above-mentioned Patent Document 5 proposes a method for measuring a gas concentration by performing a correction operation for excluding the influence of temperature and humidity by an arithmetic circuit based on a result measured with a general temperature and humidity element. Has been.
In general, since such a crystal resonator sensor employs a crystal resonator that can be driven for a long time with low power, measurement can be performed for a long time even with a small-capacity power source.

特開2001−153777号公報JP 2001-153777 A 特開2005−189076号公報Japanese Patent Laying-Open No. 2005-189076 特開2005−189133号公報JP 2005-189133 A 特開2000−275157号公報JP 2000-275157 A 特開2004−226177号公報JP 2004-226177 A

現在、例えば、厳しい食品安全基準下で管理される、生鮮食料品や食品の原材料をコンテナ、タンク、貨物室等の密閉容器、密閉空間に収容して輸送する場合、毒物等の混入がないか、あるいは、出荷から納入までの間に、腐敗等劣化が発生していないかの確認は、納入後の抜き取り検査で、臭気、変色、さらには成分分析などを行っており、コストと時間を要し、しかも、全数を厳密に検査することは不可能である。
また、輸送期間が長期にわたる場合、こうした生鮮食料品や食品の原材料の納入後、どのくらいの期間使用できるかは、出荷からの環境変化にも依存するが、輸送期間に、どのような環境で管理されていたかの確認を行うことも不可能であった。
At present, for example, if perishable foods and food ingredients that are managed under strict food safety standards are contained in containers, tanks, cargo containers, etc. In addition, to check for deterioration such as decay between shipment and delivery, odors, discoloration, and component analysis are performed by sampling after delivery, which requires cost and time. Moreover, it is impossible to inspect all the numbers strictly.
In addition, if the transportation period is long, how long it can be used after delivery of these fresh foods and food ingredients depends on the environmental changes from shipment, but it is managed in what kind of environment during the transportation period. It was also impossible to check if it had been done.

本発明者は、上記課題を解決するため鋭意検討を重ねた結果、水晶振動子の電極表面または電極金属そのものを検出部とし、この電極表面に対する物質の吸脱着現象を発振周波数の周波数変化に変換する、水晶振動子センサによるガス検知を利用すれば、コンパクトなガス計測器を構成でき、狭い密閉空間であっても収容可能であり、しかも、単体で長期間の作動が可能となり、密閉空間内における特定ガスの経時変化を正確に記録可能になることを見出した。   As a result of intensive studies to solve the above problems, the present inventor uses the electrode surface of the crystal resonator or the electrode metal itself as a detection unit, and converts the adsorption / desorption phenomenon of the substance on the electrode surface into a frequency change of the oscillation frequency. If gas detection by a quartz crystal sensor is used, a compact gas measuring instrument can be configured and can be accommodated even in a narrow sealed space. It has been found that it is possible to accurately record the change with time of a specific gas.

水晶振動子センサによるガス検知では、水晶の表面、又は水晶を挟んで形成した電極の表面に何らかの物質が付着すると、その質量の変化によって、水晶の周波数特性が変化することを利用するため、電極表面の吸脱着原理から検出対象ガスを変化させず、酸素や燃焼性ガスがなくても検出可能であり、しかも、低電力で長期間にわたり特定のガス成分を正確に検出することが可能になる。   In gas detection using a quartz crystal sensor, if any substance adheres to the surface of the crystal or the surface of the electrode formed with the crystal in between, the frequency characteristics of the crystal change due to the change in its mass. The detection gas can be detected without changing the detection target gas from the surface adsorption / desorption principle, and it is possible to detect specific gas components accurately over a long period of time with low power. .

そこで、本発明では、上記先行技術文献に開示されているような水晶振動子センサの低電力性に着目し、こうした密閉空間の内部に、単体で収容可能であり、例えば、毒物の気化成分や、食品材料の腐敗にともなって発生するアンモニアガス等の特定ガス成分に対し、その密閉空間における成分濃度、さらには、その他の環境の変化を長時間にわたり高精度に計測し、その計測結果を時間とともに記録し、密閉空間の環境の経時変化を長期にわたり確認できるようにすることを目的とする。
なお、水晶振動子センサの電極表面に、アンモニアと化合物を形成する金属を設け、環境中のアンモニアガス濃度を検出するセンサについては、出願人が先に出願した特願2008-101752号に開示されている。
Therefore, in the present invention, paying attention to the low power property of the quartz resonator sensor as disclosed in the above prior art document, it can be accommodated alone in such a sealed space, for example, a vaporizing component of poison, Measures the concentration of components in the sealed space and other environmental changes with high accuracy over a long period of time with respect to specific gas components such as ammonia gas generated with the decay of food materials. The purpose of this is to make it possible to confirm the change over time of the environment of the sealed space over a long period of time.
Note that a sensor for detecting a concentration of ammonia gas in the environment by providing a metal that forms a compound with ammonia on the electrode surface of the crystal resonator sensor is disclosed in Japanese Patent Application No. 2008-101752 previously filed by the applicant. ing.

上記の課題を解決するため、本発明のガス計測器は、つぎのような技術的手段を講じた。すなわち、
(1)ガス計測器を、本体と、水晶片を挟むように電極が形成され、当該電極の表面に、特定のガス成分を吸着する有機系の検知薄膜が設けられたガス測定素子と、前記電極に所定の電圧を印加するとともに、前記ガス測定素子の振動周波数を測定し、測定した振動周波数を時間とともに記憶手段に記録させる計測回路と、該計測回路に電力を供給する電源部とから構成し、前記本体に、前記ガス測定素子及び計測回路、並びに、温度及び湿度を検知する検知素子、記憶手段及び電源部を内蔵させ、密閉空間に配置することにより、ガス計測器単体で、前記密閉空間内の前記特定ガス成分並びに温度、湿度の経時変化を前記記憶手段に記録させるようにするとともに、前記検知素子が検知した温度及び湿度に基づき、前記計測回路による計測結果に与える温度及び湿度の影響を排除して正確な検出値に補正するようにした。
In order to solve the above problems, the gas measuring instrument of the present invention has taken the following technical means. That is,
(1) A gas measuring device having a gas measuring element in which an electrode is formed so as to sandwich a main body and a crystal piece, and an organic detection thin film that adsorbs a specific gas component is provided on the surface of the electrode; A measurement circuit that applies a predetermined voltage to the electrode, measures the vibration frequency of the gas measurement element, and records the measured vibration frequency in a storage unit with time, and a power supply unit that supplies power to the measurement circuit In addition, the gas measuring device alone, the gas measuring device alone, the gas measuring device alone, by incorporating the gas measuring element and the measurement circuit , the detection element for detecting temperature and humidity, the storage means, and the power supply unit in the main body. the specific gas component and the temperature in the space, as well as the time course of humidity so as to record in the memory means, based on the temperature and humidity the sensing element has detected, measured by said measuring circuit And it is corrected to the accurate detection values by eliminating the influence of temperature and humidity give fruit.

(2)上記のガス計測器において、前記本体に、それぞれ個別のガス成分を吸着する有機系の検知薄膜が設けられたガス測定素子を複数設け、前記計測装置が、各ガス測定素子の前記電極に所定の電圧を印加するとともに、各ガス測定素子の振動周波数を測定し、ガス測定素子毎に測定した振動周波数を時間とともに前記記憶手段に記録させるようにした。 (2) In the gas measuring instrument described above, the main body is provided with a plurality of gas measuring elements each provided with an organic detection thin film that adsorbs individual gas components, and the measuring device includes the electrodes of the gas measuring elements. A predetermined voltage was applied to the gas measuring element, and the vibration frequency of each gas measuring element was measured, and the vibration frequency measured for each gas measuring element was recorded in the storage unit with time.

(3)上記のガス計測器において、前記本体に、前記温度及び湿度を検知する検知素子に加え、気圧、光強度、振動を検出する他の検知素子が内蔵され、前記計測装置が、前記特定ガス成分の時間変化に加え、温度、湿度、気圧、光強度並びに動の時間変化を前記記憶手段に記録させるようにした。 (3) In the gas meter, to the main body, in addition to the sensing element for detecting the temperature and humidity, air pressure, light intensity, is built other detection element for detecting the vibration, the measuring device, wherein in addition to the time variation of the specific gas component, temperature, humidity, atmospheric pressure, the time variation of the light intensity as well as vibration and so as to record in the memory means.

(4)前記計測回路が、任意の時間間隔でガス測定素子または他の検知素子を起動し、その検知結果を前記記憶手段に記録させるようにした。 (4) The measurement circuit starts a gas measurement element or another detection element at an arbitrary time interval, and records the detection result in the storage means.

本発明による上記(1)の技術的手段によれば、ガス計測器本体に、水晶振動子センサを利用したガス測定素子、計測回路、記憶手段及び電源部を内蔵させ、ガス計測器を単体で密閉空間に配置することにより、この空間内の特定ガス成分の経時変化を記憶手段に記録させることができ、この記憶手段の記録内容を、パーソナルコンピュータ等に読み取らせることにより、密閉空間における特定ガスの成分濃度の経時的変化を確認することができる。   According to the technical means of the above (1) according to the present invention, the gas measuring instrument main body incorporates the gas measuring element, the measuring circuit, the storage means and the power supply unit using the crystal resonator sensor, and the gas measuring instrument is used alone. By arranging in a sealed space, it is possible to record changes in the specific gas component in this space over time in the storage means, and by reading the recorded contents of this storage means to a personal computer or the like, the specific gas in the sealed space can be recorded. The change with time of the component concentration of can be confirmed.

水晶振動子センサを利用したガス測定素子によれば、測定対象ガスを消費することなく別の物質に変換することもないため、密閉容器内のガス成分を変化させることがなく、検知素子の測定値の変化を測定することによって、内部の変化状況をリアルタイムに測定することが可能である。
さらに、酸素や燃焼性ガスが存在しなくとも、対象ガスを検出することが可能である。つまり、密閉容器内が真空であっても、その状態から内部のガス雰囲気状況を検出することが可能であり、種々の密閉空間の計測に適用できる。
According to the gas measuring element using the quartz resonator sensor, the gas to be measured is not consumed and converted into another substance, so that the gas component in the sealed container is not changed, and the sensing element is measured. By measuring the change in value, it is possible to measure the internal change state in real time.
Furthermore, it is possible to detect the target gas without the presence of oxygen or combustible gas. That is, even if the inside of the sealed container is vacuum, it is possible to detect the state of the gas atmosphere inside from the state, and it can be applied to measurement of various sealed spaces.

また、水晶振動子センサを利用したガス測定素子は、水晶振動子が電気機器などに広く使用されている汎用品を利用することができ、低価格の測定器の製作が可能であり、その大きさも一般的な半導体式センサと同様、またはそれ以下であるため、どのような場所でも利用しやすい形態である。さらに、半導体式センサと比較すると、動作に使用する電力消費も僅かであるため、同容量の電池を使用した場合、はるかに長時間の測定が可能となる。   In addition, the gas measuring element that uses the quartz crystal sensor can be a general-purpose product that is widely used in electrical equipment, etc., making it possible to manufacture low-cost measuring instruments. In addition, since it is the same as or lower than that of a general semiconductor sensor, it is easy to use in any place. Furthermore, since the power consumption used for the operation is small compared with the semiconductor type sensor, it is possible to perform measurement for a much longer time when using a battery of the same capacity.

本発明による上記(2)の技術的手段によれば、ガス計測器本体に、複数の特定ガス成分を検出する水晶振動子センサを利用したガス測定素子を内蔵させたから、複数の特定ガス成分に基づき、密閉空間内の環境の経時的変化を確認することができる。   According to the technical means of the above (2) according to the present invention, the gas measuring device main body incorporates the gas measuring element using the quartz vibrator sensor for detecting the plurality of specific gas components. Based on this, it is possible to confirm the change with time of the environment in the sealed space.

本発明による上記(3)の技術的手段によれば、特定ガス成分の経時的変化のみならず、温度、湿度、気圧、光強度、振動等の経時変化も合わせて確認することができ、特定ガス成分の発生原因を究明したり、密閉空間内の環境の経時的変化を多角的に確認することができる。
特に、水晶振動子センサを利用したガス測定素子は、温度や湿度の変化によって、測定値が変化する場合があるため、温度センサや湿度センサの検出値に基づいて、計測結果を分析したり、このような影響を排除して、正確な検出値に補正することができる。
また、食品などの輸送中の安全性評価・測定において、ガス検知同様に温度、湿度などの環境データは不可欠であるため、水晶振動子の補正用として温湿度データを利用するのと同様に、劣化など衛生管理上も必要なデータである。これは、同様に、気圧や照度(光強度)、振動などの要因も衛生管理上の原因究明には不可欠なデータであるとともに、水晶振動子センサの出力変化の補正用としても場合によっては必要であることから、これら公知のセンサ出力の記録も同時に行うことが好ましい。
According to the technical means (3) according to the present invention, not only the change with time of the specific gas component but also the change with time such as temperature, humidity, atmospheric pressure, light intensity, vibration, etc. can be confirmed. The cause of the generation of gas components can be investigated, and the changes over time in the environment in the sealed space can be confirmed from various angles.
In particular, the gas measurement element using a crystal resonator sensor may change the measurement value due to changes in temperature or humidity, so the measurement result can be analyzed based on the detection value of the temperature sensor or humidity sensor, It is possible to correct such a detection value by eliminating such influence.
In addition, environmental data such as temperature and humidity are indispensable in the safety evaluation and measurement during transportation of food, etc., as with gas detection. This data is necessary for hygiene management such as deterioration. Similarly, factors such as atmospheric pressure, illuminance (light intensity), and vibration are also indispensable data for investigating the cause of hygiene management, and may also be necessary in some cases for correcting changes in the output of a quartz crystal sensor. Therefore, it is preferable to simultaneously record these known sensor outputs.

本発明による上記(4)の技術的手段によれば、任意の時間間隔で特定ガス成分の経時変化を記憶手段に記録させることができ、密閉空間の環境や収容される物質、さらには輸送時間などに応じ、最適なサンプリングタイミングに設定することができる。   According to the technical means of the above (4) according to the present invention, the change with time of the specific gas component can be recorded in the storage means at an arbitrary time interval, and the environment of the enclosed space, the substance to be accommodated, and further the transportation time The optimum sampling timing can be set according to the above.

本発明に係る環境測定装置の一実施形態の構造を模式的に示す図である。It is a figure showing typically the structure of one embodiment of the environment measuring device concerning the present invention.

本発明に係る測定装置は、対象ガス測定素子の周波数を測定する周波数測定装置と、その他の環境条件、つまり温度、湿度、気圧、光強度、振動を測定する部分を備えており、かつその測定した値を記録し保存する記憶部から構成されている。
ここで、この水晶振動子を利用したガス測定手法は、他のガス測定用素子同様、環境条件の影響を受けることがある。つまり、ガス濃度変化がなくても温度や湿度の変化によって、測定値が変化する場合がある。このような影響を排除する必要がある場合、他のガス測定素子同様に一般的な公知の原理に基づく温度や湿度測定用検知素子を備え、ガス測定と同様に温度や湿度の測定も行い、測定値を記録する構成を有するものである。
The measuring apparatus according to the present invention includes a frequency measuring apparatus that measures the frequency of the target gas measuring element and other environmental conditions, that is, a part that measures temperature, humidity, atmospheric pressure, light intensity, and vibration, and the measurement. It consists of a storage unit that records and saves the measured values.
Here, the gas measuring method using the crystal resonator may be influenced by environmental conditions like other gas measuring elements. That is, even if there is no change in gas concentration, the measured value may change due to changes in temperature and humidity. When it is necessary to eliminate such influences, it is equipped with a temperature and humidity measuring element based on a general known principle like other gas measuring elements, and also measures temperature and humidity in the same way as gas measurement, It has the structure which records a measured value.

さらに、密閉空間の環境変化に影響を及ぼす、気圧(内部圧力)や光強度、振動などについても、温度や湿度同様に測定し記録するようにしている。
これは、密閉空間がどのような環境変化を経てきたものか確認するとともに、例えば密封容器内に貯蔵、保存されている物質が温度や湿度、気圧や光の影響、さらに振動など環境条件の変化によって、物質の変化が起こり、それに伴って異常なガス成分が発生することも考えられるためである。その場合の原因究明のために、各種変化要因を検知する素子が必要であることから、これらのデータも記録する必要がある。なお、その記録を行う際に時間情報も同時に記録するようにするとよい。
Furthermore, the atmospheric pressure (internal pressure), light intensity, vibration, etc. that affect the environmental change of the sealed space are also measured and recorded in the same manner as temperature and humidity.
This confirms what kind of environmental change the sealed space has undergone, and changes in environmental conditions such as temperature, humidity, atmospheric pressure, light effects, and vibrations of substances stored and stored in sealed containers, for example. This is because a change in the substance may occur and an abnormal gas component may be generated. In order to investigate the cause in such a case, an element for detecting various change factors is necessary, and it is also necessary to record these data. Note that time information may be recorded at the same time as the recording.

図1を用いて、本発明に係る環境条件を検知する装置の一実施形態について説明する。
図1は本実施の形態に係る測定装置1の構成を模式的に示す図である。
測定装置1は、水晶振動子センサを利用したガス測定素子2、測定部3及び計算部4とからなる計測回路、記憶部(記憶手段)5、及びアルカリ電池や2次電池等からなる電源部を備えている。
検出部2は、検知すべき気体を測定するための圧電素子型の測定用素子2aが備えられており、さらに環境条件を測定する、温度測定素子2b、湿度測定素子2c、圧力(気圧)測定素子2dを備えている。ここでは、明記していないが、この他に必要に応じて光強度、振動などの測定素子を併せて備えてもよい。
An embodiment of an apparatus for detecting environmental conditions according to the present invention will be described with reference to FIG.
FIG. 1 is a diagram schematically showing a configuration of a measuring apparatus 1 according to the present embodiment.
The measuring device 1 includes a gas measuring element 2 using a crystal resonator sensor, a measuring circuit including a measuring unit 3 and a calculating unit 4, a storage unit (storage unit) 5, and a power supply unit including an alkaline battery and a secondary battery. It has.
The detection unit 2 includes a piezoelectric element type measurement element 2a for measuring a gas to be detected, and further measures an environmental condition, a temperature measurement element 2b, a humidity measurement element 2c, and a pressure (atmospheric pressure) measurement. An element 2d is provided. Although not specified here, measurement elements such as light intensity and vibration may be additionally provided as necessary.

気体を測定する素子2aは、密閉容器中のガス濃度を測定するための水晶振動子であり、水晶を挟むように電極が形成され、当該電極の表面には有機系の検知薄膜が配設されている。この検知被膜は、特定ガス成分を吸着するものであり、密閉空間の特定ガス成分濃度に応じて、重量が変化するものである。
測定部3は、ガス測定素子2aの電極に、所定電圧の交流電界を印加し、その表面での重量の増加に応じて発振周波数を測定するものである。さらに、温度測定素子2b、湿度測定素子2c、圧力測定素子2dの各測定原理に基づく検知信号も測定するものである。
The element 2a for measuring gas is a crystal resonator for measuring the gas concentration in the sealed container, and an electrode is formed so as to sandwich the crystal, and an organic detection thin film is disposed on the surface of the electrode. ing. This detection film adsorbs the specific gas component, and the weight changes according to the specific gas component concentration in the sealed space.
The measuring unit 3 applies an alternating electric field of a predetermined voltage to the electrode of the gas measuring element 2a and measures the oscillation frequency according to the increase in weight on the surface. Furthermore, the detection signal based on each measurement principle of the temperature measuring element 2b, the humidity measuring element 2c, and the pressure measuring element 2d is also measured.

また、測定器3は、各測定素子と接続されているとともに、計算部4にも、当該計算部4を介して記憶部5にも接続されており、計算部4は、発振周波数−特定ガス成分濃度のマップ等を用いて、各測定素子から得られた信号を必要に応じて必要な物理量などに変換し当該関係を記憶部5に出力するものである。   The measuring device 3 is connected to each measuring element, and is also connected to the calculation unit 4 and the storage unit 5 via the calculation unit 4, and the calculation unit 4 has an oscillation frequency-specific gas. Using a component concentration map or the like, a signal obtained from each measuring element is converted into a necessary physical quantity as necessary, and the relationship is output to the storage unit 5.

記憶部5は、計算部4の出力をその時間とともに記憶するものである。なお、記録したデータは、一般的な記憶媒体(メモリカードなど)や公知のインターフェイスなどを介してPC等公知の計算機またはそれに類する電子機器に出力可能な構造を有するものである。
なお、計測回路が、任意の時間間隔でガス測定素子または他の検知素子を起動し、その検知結果を記憶手段に記録させるよう、PC等公知の計算機を介して、設定できるようにしている。
The memory | storage part 5 memorize | stores the output of the calculation part 4 with the time. The recorded data has a structure that can be output to a known computer such as a PC or similar electronic device via a general storage medium (such as a memory card) or a known interface.
The measurement circuit can be set via a known computer such as a PC so that the gas measurement element or other detection elements are activated at arbitrary time intervals and the detection results are recorded in the storage means.

本発明によれば、コンパクトな構造でガス測定素子を構成することができ、狭い密閉空間であっても単体で配置することが可能であり、高感度かつ簡便にガス濃度を測定できる。
さらに、本発明に係るガス測定素子は、いずれも、電極上での重量変化を周波数変化という形態で数値化しているため、分析者毎に生じる測定値の読み取り誤差を著しく小さくでき、また、水晶振動子自体は電気機器等に使用されている汎用品であり、しかも、低電力で長時間作動可能であるから、低価格で、電源部も含め、携帯も可能なコンパクトなガス計測器にすることができる。
According to the present invention, the gas measuring element can be configured with a compact structure, and can be arranged alone even in a narrow sealed space, and the gas concentration can be measured with high sensitivity and ease.
Furthermore, since all of the gas measuring elements according to the present invention digitize the weight change on the electrode in the form of frequency change, the reading error of the measured value generated for each analyst can be remarkably reduced. The vibrator itself is a general-purpose product used in electrical equipment, etc., and can operate for a long time with low power, making it a low-cost, compact gas measuring instrument that can be carried, including the power supply. be able to.

また、水晶振動子センサによるガス検知は、電極表面の吸脱着原理から検出対象ガスを変化させず、酸素や燃焼性ガスがなくても検出可能な原理であることから、排気ガスの影響がなく、密閉容器内の長期間の状況変化測定などで有利に使用できる。
特に、総合的な環境情報の記録が必要な分野で有効に利用可能であり、コンテナ、トラックなどの輸送部門や食品輸送などの個別輸送容器内の管理測定に活用することにより、輸送の安全性、品質、さらには食品安全性を格段に高めることができる。
In addition, the gas detection by the quartz crystal sensor is a principle that can be detected without oxygen or flammable gas without changing the detection target gas based on the adsorption / desorption principle of the electrode surface. It can be advantageously used for long-term change measurement in a sealed container.
In particular, it can be used effectively in fields where comprehensive environmental information recording is required, and it can be used for management measurements in the transport sector such as containers and trucks and in individual transport containers such as food transport. , Quality, and even food safety.

本発明に係るガス測定素子、データ記録装置及び測定記録方法は、物品管理などの分野で広く利用されることが期待され、特に食品などの安全性に関わる品質劣化や毒物混入など、さらにトレーサビリティ測定全般など、記録計測する分野で広く利用可能である。   The gas measuring element, the data recording apparatus and the measurement recording method according to the present invention are expected to be widely used in the field of article management and the like, and in particular, traceability measurement such as quality deterioration related to safety of foods, contamination with poisons, etc. It can be widely used in the field of recording measurement such as general.

1 測定装置
2 検出部
2a ガス測定素子
2b 温度測定素子
2c 湿度測定素子
2d 気圧(圧力)測定素子
3 測定部
4 計算部
5 記憶部
DESCRIPTION OF SYMBOLS 1 Measuring apparatus 2 Detection part 2a Gas measuring element 2b Temperature measuring element 2c Humidity measuring element 2d Atmospheric pressure (pressure) measuring element 3 Measuring part 4 Calculation part 5 Storage part

Claims (4)

ガス計測器を、本体と、水晶片を挟むように電極が形成され、当該電極の表面に、特定のガス成分を吸着する有機系の検知薄膜が設けられたガス測定素子と、前記電極に所定の電圧を印加するとともに、前記ガス測定素子の振動周波数を測定し、測定した振動周波数を時間とともに記憶手段に記録させる計測回路と、該計測回路に電力を供給する電源部とから構成し、
前記本体に、前記ガス測定素子及び計測回路、並びに、温度及び湿度を検知する検知素子、記憶手段及び電源部を内蔵させ、密閉空間に配置することにより、ガス計測器単体で、前記密閉空間内の前記特定ガス成分並びに温度、湿度の経時変化を前記記憶手段に記録させるようにするとともに、前記検知素子が検知した温度及び湿度に基づき、前記計測回路による計測結果に与える温度及び湿度の影響を排除して正確な検出値に補正することを特徴とするガス計測器。
The gas measuring device includes a main body, a gas measuring element in which an electrode is formed so as to sandwich a crystal piece, and an organic detection thin film that adsorbs a specific gas component is provided on the surface of the electrode. A measurement circuit that measures the vibration frequency of the gas measurement element and records the measured vibration frequency in a storage unit over time, and a power supply unit that supplies power to the measurement circuit,
The gas measuring device alone is installed in the sealed space by incorporating the gas measuring element and the measurement circuit , the detection element for detecting temperature and humidity, the storage unit, and the power supply unit in the main body, and placing the gas measuring device in the sealed space. The specific gas component and the temporal change of temperature and humidity are recorded in the storage means, and the influence of the temperature and humidity on the measurement result by the measurement circuit is based on the temperature and humidity detected by the detection element. A gas measuring instrument characterized by eliminating and correcting to an accurate detection value .
前記本体に、それぞれ個別のガス成分を吸着する有機系もしくは無機系の検知薄膜が設けられたガス測定素子を複数設け、
前記計測装置が、各ガス測定素子の前記電極に所定の電圧を印加するとともに、各ガス測定素子の振動周波数を測定し、ガス測定素子毎に測定した振動周波数を時間とともに前記記憶手段に記録させることを特徴とする請求項1記載のガス計測器。
The main body is provided with a plurality of gas measuring elements each provided with an organic or inorganic detection thin film that adsorbs individual gas components,
The measurement device applies a predetermined voltage to the electrodes of each gas measurement element, measures the vibration frequency of each gas measurement element, and records the vibration frequency measured for each gas measurement element in the storage unit with time. The gas measuring instrument according to claim 1.
前記本体に、前記温度及び湿度を検知する検知素子に加え、気圧、光強度、振動を検出する他の検知素子が内蔵され、
前記計測装置が、前記特定ガス成分の時間変化に加え、温度、湿度、気圧、光強度並びに動の時間変化を前記記憶手段に記録させるようにしたことを特徴とする請求項1または2に記載のガス計測器。
The body, in addition to the sensing element for detecting the temperature and humidity, air pressure, light intensity, is built other detection element for detecting vibration,
The measuring device, in addition to the time variation of the specific gas component, temperature, humidity, atmospheric pressure, the time variation of the light intensity and vibration to claim 1 or 2, characterized in that so as to record in the memory means The gas meter described.
前記計測回路が、任意の時間間隔でガス測定素子または他の検知素子を起動し、その検知結果を前記記憶手段に記録させるようにしたことを特徴とする請求項1ないし3に記載のガス計測器。   4. The gas measurement according to claim 1, wherein the measurement circuit starts a gas measurement element or another detection element at an arbitrary time interval and records the detection result in the storage means. vessel.
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