JP6004535B2 - Gas detector - Google Patents
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Description
この発明は呼気中のエタノール等の検出に関する。 The present invention relates to detection of ethanol or the like in exhaled breath.
電気化学ガスセンサにより呼気中のエタノール濃度を測定することが行われている。電気化学ガスセンサは精度と定量性とに優れているが、エタノール濃度を定量するには１０秒程度必要である。業務用のガス検出装置で多数の人員に対し、呼気中のエタノール濃度を検査する場合、１０秒の待時間は長い。また個人用でも１０秒は短い時間ではない。なお特許文献１（JP2005-69742A）は、呼気中のエタノール濃度が0.05mg/L以下の場合、エタノール濃度を０と表示することを開示している。 An ethanol gas concentration is measured by an electrochemical gas sensor. The electrochemical gas sensor is excellent in accuracy and quantitativeness, but it takes about 10 seconds to determine the ethanol concentration. When inspecting the concentration of ethanol in exhaled air for a large number of people using a commercial gas detector, the waiting time of 10 seconds is long. Even for personal use, 10 seconds is not a short time. Patent Document 1 (JP2005-69742A) discloses that the ethanol concentration is displayed as 0 when the ethanol concentration in the exhalation is 0.05 mg / L or less.
この発明は、ガス濃度が低い場合には短時間で定性でき、ガス濃度が高い場合には正確にガス濃度を定量できるガス検出装置を提供することを課題とする。 An object of the present invention is to provide a gas detection device that can qualify in a short time when the gas concentration is low, and that can accurately determine the gas concentration when the gas concentration is high.
この発明は、電解質と検知極と対極とを備え、検出対象ガスを検知極で分解することにより生成したプロトンもしくは水酸化物イオンを、電解質を介して対極へ輸送する電気化学ガスセンサと、
ガスセンサへ一定量の被検出雰囲気を導入するポンプと、
ガスセンサの信号から検出対象ガスの濃度を求めるマイクロコンピュータと、
検出対象ガスの濃度を表示する表示器、とを有するガス検出装置において、
マイクロコンピュータは、
ポンプによりガスセンサへ一定量の被検出雰囲気を導入した後、第１の時間内のガスセンサの信号から、検出対象ガスの有無を定性する定性部と、
ガスセンサへ一定量の被検出雰囲気を導入した後、第１の時間よりも長い第２の時間の間、ガスセンサの信号を積算することにより、検出対象ガスの濃度を定量する定量部と、
定性部で検出対象ガスが無いと定性した場合、定性結果を表示器に表示する出力インターフェース、とを備えている。
This invention comprises an electrolyte, a detection electrode, and a counter electrode, and an electrochemical gas sensor that transports protons or hydroxide ions generated by decomposing the detection target gas at the detection electrode to the counter electrode via the electrolyte;
A pump that introduces a certain amount of atmosphere to be detected into the gas sensor;
A microcomputer for obtaining the concentration of the detection target gas from the signal of the gas sensor;
In a gas detection device having a display for displaying the concentration of the detection target gas,
The microcomputer
After introducing a certain amount of atmosphere to be detected to the gas sensor by the pump, from the gas sensor signal within the first time, a qualitative part for qualifying the presence or absence of the detection target gas;
A quantitative unit that quantifies the concentration of the detection target gas by integrating the gas sensor signals for a second time longer than the first time after introducing a certain amount of the atmosphere to be detected into the gas sensor;
And an output interface for displaying a qualitative result on a display when the qualitative unit qualifies that there is no detection target gas .
この発明では、検出対象ガスは呼気中のエタノールで、
ガス検出装置の温度を測定する温度センサを備え、
定性部は、第１の時間内のガスセンサの信号のピーク値を、温度センサの信号により補正することにより、検出対象ガスの濃度を求め、求めた検出対象ガスの濃度が所定値未満の場合に検出対象ガスが無いと定性し、
定性部が検出対象ガスが無いと定性した場合、表示器は検出対象ガスの濃度を０と表示するように構成され、かつ
定量部は検出対象ガスの濃度が所定値以上の場合にのみ定量を行うように構成されている。
In the present invention, the detection target gas is ethanol in exhaled breath,
It has a temperature sensor that measures the temperature of the gas detector,
The qualitative unit obtains the concentration of the detection target gas by correcting the peak value of the signal of the gas sensor within the first time by the signal of the temperature sensor, and when the calculated concentration of the detection target gas is less than a predetermined value Qualifies that there is no detection target gas,
When the qualitative part qualifies that there is no detection target gas, the indicator is configured to display the concentration of the detection target gas as 0, and the quantification part performs quantification only when the concentration of the detection target gas is equal to or higher than a predetermined value. Configured to do.
ここで第１の時間内のガスセンサの信号は、例えばガスセンサ信号のピーク値、ガスセンサ信号の増加率、第１の時間内のガスセンサ信号の積算値（ピーク面積）等で、特にガスセンサ信号のピーク値が好ましい。この信号から検出対象ガスの有無を定性できる。酒気帯びの検査等では、大部分の場合、呼気中にエタノールが含まれていないか、あるいは酒気とは関係のない微量のエタノールが含まれているに過ぎないから、”検出対象ガス濃度０”等の定性結果を表示器に表示し、検査を終了できる。漏洩の検査でも、同様に大部分の場合、漏洩は生じていないので、定性が完了した段階で検査を打ち切ると、短時間で検査できる。 Here, the gas sensor signal within the first time is, for example, the peak value of the gas sensor signal, the rate of increase of the gas sensor signal, the integrated value (peak area) of the gas sensor signal within the first time, and the peak value of the gas sensor signal in particular. Is preferred. The presence or absence of the detection target gas can be qualitatively determined from this signal. In the case of alcoholic testing, etc., in most cases, the exhaled breath does not contain ethanol or contains only a small amount of ethanol that is not related to alcohol. The qualitative result such as can be displayed on the display and the inspection can be completed. Similarly, in the case of leakage inspection, in most cases, leakage does not occur. Therefore, inspection can be completed in a short time if the inspection is terminated after qualitative completion.
電気化学ガスセンサでは、センサ内に導入されたガス濃度に比例する電流が電極間を流れ、この電流値を積算する、言い換えるとセンサ信号のピーク面積を求めることにより、ガス濃度を定量できる。これには導入されたガスをガスセンサ内で消費し終わるまでの時間が必要で、第２の時間はこの時間以上の時間で、定量には時間がかかる。そこで検出対象ガスが存在すると定性したときのみ定量すると、短時間で酒気帯びの検査、漏洩の検査等を行うことができる。そして酒気帯びの可能性があるとき、及び漏洩の可能性があるとき等は、正確なガス濃度を定量する。 In an electrochemical gas sensor, a current proportional to the gas concentration introduced into the sensor flows between the electrodes, and this current value is integrated. In other words, the gas concentration can be quantified by obtaining the peak area of the sensor signal. This requires time until the introduced gas is completely consumed in the gas sensor. The second time is longer than this time, and it takes time to determine the amount. Therefore, if the amount of gas to be detected is quantified only when it is qualitatively present, it is possible to perform an examination of drought, an inspection of leakage, etc. in a short time. Then, when there is a possibility of alcohol or when there is a possibility of leakage, the accurate gas concentration is quantified.
電気化学ガスセンサでは、センサ信号のピーク面積は周囲温度依存性が小さいが、ピーク値は無視できない周囲温度依存性がある。ピーク値は検知極での検出対象ガスの反応速度に依存し、ピーク面積はガスセンサ内に導入された検出対象ガスの総量に依存するからである。なお呼気中のエタノールを検出する場合、温度依存性が生じる原因はガスセンサの温度にあり、呼気の温度ではない。従って温度センサは、ガスセンサの温度あるいはガスセンサの周囲の温度、例えばガス検出装置の内部の温度を測定する。また呼気中のエタノール濃度が所定値未満の場合、酒気帯びはなく、定性で得られたエタノール濃度はアセトン等の体内から発生する他のガス、あるいは調味料中のエタノール等に基づくもので、エタノール濃度を０と表示すればよい。 In the electrochemical gas sensor, the peak area of the sensor signal has small ambient temperature dependence, but the peak value has ambient temperature dependence that cannot be ignored. This is because the peak value depends on the reaction rate of the detection target gas at the detection electrode, and the peak area depends on the total amount of detection target gas introduced into the gas sensor. When detecting ethanol in exhaled breath, the temperature dependency is caused by the temperature of the gas sensor, not the exhaled breath temperature. Therefore, the temperature sensor measures the temperature of the gas sensor or the temperature around the gas sensor, for example, the temperature inside the gas detection device. In addition, when the ethanol concentration in exhaled breath is less than the predetermined value, there is no alcohol, and the ethanol concentration obtained qualitatively is based on other gases generated from the body such as acetone, or ethanol in seasonings. The density may be displayed as 0.
以下に本発明を実施するための最適実施例を示す。 In the following, an optimum embodiment for carrying out the present invention will be shown.
図１〜図６に実施例のガス検出装置とその特性を示し、ガス検出装置は呼気中のエタノール濃度の測定装置、即ち酒気帯びの検査装置である。図において、２は電気化学ガスセンサで、以下単にガスセンサ２という。ガスセンサ２はプロトン導電体、水酸化物イオン導電体等の固体電解質、あるいは硫酸等の液体電解質を保持するセパレータ、の一面に検知極を、反対面に対極を備え、これ以外に参照極を備えていても良い。また電解質を液溜に蓄えて、その被検出雰囲気側に検知極を、反対側に対極を設けても良い。ガスセンサ２内をエタノール等の被検出雰囲気の濃度に比例した電流が流れ、この電流値を増幅したものをセンサ信号とする。またセンサ信号を雰囲気の導入後から第２の時間、ここでは例えば１０秒間積算したものをピーク面積とする。なお高濃度のエタノールを経験した場合を除き、１０秒経過するとガスセンサ２を流れる電流はほぼ０になる。 FIG. 1 to FIG. 6 show the gas detection device of the embodiment and its characteristics. The gas detection device is a device for measuring the ethanol concentration in exhaled breath, that is, an inspection device for alcohol. In the figure, reference numeral 2 denotes an electrochemical gas sensor, which is simply referred to as a gas sensor 2 hereinafter. The gas sensor 2 has a detection electrode on one surface, a solid electrode such as a proton conductor or hydroxide ion conductor, or a separator holding a liquid electrolyte such as sulfuric acid, a counter electrode on the opposite surface, and a reference electrode in addition to this. May be. Further, the electrolyte may be stored in a liquid reservoir, and a detection electrode may be provided on the detected atmosphere side and a counter electrode may be provided on the opposite side. A current proportional to the concentration of the atmosphere to be detected such as ethanol flows in the gas sensor 2, and a sensor signal is obtained by amplifying the current value. Further, the peak area is obtained by integrating the sensor signal for a second time after the introduction of the atmosphere, for example, for 10 seconds here. Note that the current flowing through the gas sensor 2 becomes almost zero after 10 seconds except when experiencing high concentration of ethanol.
ドライブ回路４はガスセンサ２を駆動すると共に、ガスセンサ２を流れる電流を増幅する。実施例では検知極と対極間に電圧を加えないが、電圧を加えて定電位電解法によりエタノール濃度を求めても良い。ソレノイドポンプ６は、雰囲気を一定量吸引することにより、一定量の被検出雰囲気をガスセンサ２内へ導入し、ソレノイドポンプ６内へ吸引した雰囲気をガスセンサ２内へ送り込むことによりガスセンサ２内の雰囲気をパージする。被験者は吹き込み管８から呼気を吹き込み、例えば枝管１２に設けた圧力センサ１４が所定時間以上、所定値以上の圧力を検出すると、呼気が吹き込まれものとして、測定シーケンスを開始する。サーミスタ１６はガスセンサ２の周囲の温度を測定し、他の温度センサでも良い。 The drive circuit 4 drives the gas sensor 2 and amplifies the current flowing through the gas sensor 2. In the embodiment, no voltage is applied between the detection electrode and the counter electrode, but the ethanol concentration may be obtained by a constant potential electrolysis method by applying a voltage. The solenoid pump 6 sucks a certain amount of atmosphere to introduce a certain amount of atmosphere to be detected into the gas sensor 2, and sends the atmosphere sucked into the solenoid pump 6 into the gas sensor 2 to change the atmosphere inside the gas sensor 2. Purge. The test subject inhales exhaled air from the inhalation tube 8. For example, when the pressure sensor 14 provided in the branch tube 12 detects a pressure equal to or greater than a predetermined value for a predetermined time or more, the measurement sequence is started assuming that exhalation is inhaled. The thermistor 16 measures the temperature around the gas sensor 2 and may be another temperature sensor.
マイクロコンピュータ１８は、圧力センサ１４からの信号により、測定シーケンスを開始し、ソレノイドポンプ６を動作させる。マイクロコンピュータ１８は、ドライブ回路４からのガスセンサ信号を用い、例えばガス導入から３秒以内のピーク値を、サーミスタ１６の信号により温度補正して、エタノール濃度を求め、エタノールの有無を定性する。また１０秒間のセンサ信号の積算値によりエタノール濃度を定量する。エタノールの有無の定性では、例えば呼気１L当たりのエタノール濃度が0.05mg/L未満で、エタノールが存在しないものとして、表示器２０にエタノール濃度０と表示させると共に、定量を中止させる。ガス検出装置は図示しない入力スイッチを備え、測定結果の表示後に再測定が入力されると、前回の測定結果の表示を終了し、再測定が可能になるまでの待時間をカウントダウンしながら表示する。待時間は前回の測定でのエタノール濃度が高いと長く、低いと短くし、例えば0.05mg/L未満（エタノール濃度０と表示）で３秒、0.05mg/L以上0.15mg/L以下で３０秒、0.15mg/L超で６０秒とする。待時間は再測定の入力からカウントダウンしても、前回の測定結果の表示からカウントダウンしても良い。前回の測定でのエタノール濃度が高いと待時間を長くすることにより、エタノール濃度が低い場合は待時間を短くでき、エタノール濃度が高い場合はガスセンサ２が前回の測定の影響を受けないようにできる。 The microcomputer 18 starts a measurement sequence based on a signal from the pressure sensor 14 and operates the solenoid pump 6. The microcomputer 18 uses the gas sensor signal from the drive circuit 4, for example, corrects the temperature of the peak value within 3 seconds from the gas introduction by the signal of the thermistor 16, obtains the ethanol concentration, and qualifies the presence or absence of ethanol. Further, the ethanol concentration is quantified by the integrated value of the sensor signal for 10 seconds. In the qualitative presence / absence of ethanol, for example, the ethanol concentration per liter of exhalation is less than 0.05 mg / L and ethanol is not present. The gas detector has an input switch (not shown). When a remeasurement is input after displaying the measurement result, the display of the previous measurement result is terminated and the waiting time until the remeasurement is possible is displayed while counting down. . The waiting time is long when the ethanol concentration in the previous measurement is high and short when it is low. For example, it is 3 seconds at less than 0.05 mg / L (displayed as ethanol concentration 0), 30 seconds at 0.05 mg / L or more and 0.15 mg / L or less. , More than 0.15 mg / L and 60 seconds. The waiting time may be counted down from the re-measurement input or may be counted down from the previous measurement result display. If the ethanol concentration in the previous measurement is high, the waiting time is lengthened, so that the waiting time can be shortened when the ethanol concentration is low, and the gas sensor 2 can be prevented from being affected by the previous measurement when the ethanol concentration is high. .
図２に示すように、マイクロコンピュータ１８の入力インターフェース２２は、ドライブ回路４、サーミスタ１６，圧力センサ１４、からの信号を受け付けると共に、ドライブ回路４とソレノイドポンプ６とを制御する。出力インターフェース３０は表示器２０での表示を制御し、測定シーケンス管理部２４は入力インターフェース２２を介して、ソレノイドポンプ６等を制御し、定性部２６と定量部２８を測定シーケンスに沿って動作させる。定性部２６は、ガス導入後例えば３秒以内のガスセンサ信号のピーク値を、サーミスタ１６の信号により補正し、仮のエタノール濃度を求める。この濃度が例えば0.05mg/L未満で、エタノール濃度を０と表示器２０に表示させ、測定シーケンス管理部２４を介して、定量部２８でのピーク面積の積算を中止させる。定量部２８はガス導入から例えば１０秒間のガスセンサ信号を積算し、ガス濃度を定量する。定量では温度補正を行っても行わなくても良い。 As shown in FIG. 2, the input interface 22 of the microcomputer 18 receives signals from the drive circuit 4, the thermistor 16, and the pressure sensor 14, and controls the drive circuit 4 and the solenoid pump 6. The output interface 30 controls the display on the display 20, and the measurement sequence management unit 24 controls the solenoid pump 6 and the like via the input interface 22, and operates the qualitative unit 26 and the quantitative unit 28 along the measurement sequence. . The qualitative unit 26 corrects the peak value of the gas sensor signal within, for example, 3 seconds after the gas introduction by the signal of the thermistor 16 to obtain a temporary ethanol concentration. For example, when the concentration is less than 0.05 mg / L, the ethanol concentration is displayed as 0 on the display 20, and the integration of the peak area in the quantification unit 28 is stopped via the measurement sequence management unit 24. For example, the quantification unit 28 integrates the gas sensor signals for 10 seconds from the gas introduction, and quantifies the gas concentration. In quantification, temperature correction may or may not be performed.
図３に実施例の呼気検査アルゴリズムを示す。圧力センサにより呼気の吹き込みを検出すると、ソレノイドポンプにより一定量の被検出雰囲気をガスセンサ内に導入する。次いで例えば１０秒間センサ信号を積算し、３秒以内のセンサ信号のピーク値をサーミスタの信号で補正して、エタノール濃度を求め、0.05mg/L未満で表示に0mg/Lと表示し、ガスセンサ信号の積算を中止する。エタノール濃度が0.05mg/L以上で積算を続行し、１０秒間の積算値をエタノール濃度に換算して表示し、次いで積算値を０にリセットする。ガスセンサ２内の雰囲気のパージは、ソレノイドポンプを逆方向に動作させ、ソレノイドポンプ内に吸引した雰囲気をガスセンサ２内へ戻すことにより行い、パージは次の測定のスタート時、あるいは１回の測定の終了時等に行う。 FIG. 3 shows the breath test algorithm of the embodiment. When inhalation of breath is detected by the pressure sensor, a certain amount of atmosphere to be detected is introduced into the gas sensor by the solenoid pump. Next, for example, the sensor signal is integrated for 10 seconds, the peak value of the sensor signal within 3 seconds is corrected with the thermistor signal, the ethanol concentration is obtained, 0 mg / L is displayed on the display below 0.05 mg / L, and the gas sensor signal Stop accumulating. Integration is continued when the ethanol concentration is 0.05 mg / L or more, the integrated value for 10 seconds is converted into the ethanol concentration and displayed, and then the integrated value is reset to zero. The purge of the atmosphere in the gas sensor 2 is performed by operating the solenoid pump in the reverse direction and returning the atmosphere sucked into the solenoid pump into the gas sensor 2, and the purge is performed at the start of the next measurement or at the time of one measurement. Perform at the end.
図４〜図６にガスセンサ２の特性を示し、図４は、0.15mg/Lのエタノールを含む雰囲気への応答波形を、０℃、２０℃、４０℃の周囲温度に対して示す。周囲温度が高いほどピークは鋭く、周囲温度が低いと応答は遅くなる。なおピークは１秒以内に生じ、３秒より短い時間でもエタノールの有無を定性できる。またピークに至る期間でのガスセンサ信号の増加率、３秒間のピーク面積等からもエタノールの有無を定性できる。 4 to 6 show the characteristics of the gas sensor 2, and FIG. 4 shows response waveforms to an atmosphere containing 0.15 mg / L ethanol with respect to ambient temperatures of 0 ° C., 20 ° C., and 40 ° C. The higher the ambient temperature, the sharper the peak, and the lower the ambient temperature, the slower the response. The peak occurs within 1 second, and the presence or absence of ethanol can be qualitative even for a time shorter than 3 seconds. Further, the presence or absence of ethanol can be qualitatively determined from the rate of increase of the gas sensor signal in the period up to the peak, and the peak area for 3 seconds.
図５は、図４のピーク値から求めたエタノール濃度を示し、温度補正を施さないデータである。図中の太い破線は、0.15mg/Lのエタノールを含む雰囲気に対し、酒気帯びの検査で求められている精度を示す。温度補正を施さないと精度が不足し、温度依存性は単純なので、所要の精度が得られるように補正できる。 FIG. 5 shows the ethanol concentration obtained from the peak value in FIG. 4 and is data without temperature correction. The thick broken line in the figure indicates the accuracy required in the examination of alcoholic spirit in an atmosphere containing 0.15 mg / L ethanol. Without temperature correction, the accuracy is insufficient and the temperature dependence is simple, so that it can be corrected to obtain the required accuracy.
図６は１０秒間のピーク面積から求めたエタノール濃度を示し、どの温度でも要求精度の範囲内の値が得られる。 FIG. 6 shows the ethanol concentration obtained from the peak area for 10 seconds, and a value within the required accuracy range can be obtained at any temperature.
実施例では以下の効果が得られる。
1) 呼気中のエタノール濃度が僅かな場合、検査を速やかに終了できる。
2) 呼気中に問題になる程度のエタノールが含まれている場合、正確に定量できる。
In the embodiment, the following effects can be obtained.
1) If the ethanol concentration in the exhaled breath is slight, the test can be completed quickly.
2) Accurate quantification is possible when there is a problem level of ethanol in exhaled breath.
なお検出対象ガスは呼気中のエタノールに限らず、皮膚表面からサンプリングした雰囲気中のエタノール、あるいはプラントの配管等から漏洩した有毒ガス等でも良い。いずれの場合も、検出対象ガスの有無を短時間で定性し、検出対象ガスが存在する場合、ある程度の時間をかけて正確な定量ができる。 The detection target gas is not limited to ethanol in exhaled breath, but may be ethanol in an atmosphere sampled from the skin surface, or a toxic gas leaked from a plant piping or the like. In either case, the presence or absence of the detection target gas is qualitated in a short time, and when the detection target gas exists, accurate quantification can be performed over a certain period of time.
２ ガスセンサ
４ ドライブ回路
６ ソレノイドポンプ
８ 吹き込み管
１０，１２ 枝管
１４ 圧力センサ
１６ 温度センサ
１８ マイクロコンピュータ
２０ 表示器
２２ 入力インターフェース
２４ 測定シーケンス管理部
２６ 定性部
２８ 定量部
３０ 出力インターフェース
2 Gas sensor 4 Drive circuit 6 Solenoid pump 8 Blowing pipe 10, 12 Branch pipe 14 Pressure sensor 16 Temperature sensor 18 Microcomputer 20 Display 22 Input interface 24 Measurement sequence management unit 26 Qualitative unit 28 Determination unit 30 Output interface
Claims (1)
前記ガスセンサへ一定量の被検出雰囲気を導入するポンプと、
前記ガスセンサの信号から検出対象ガスの濃度を求めるマイクロコンピュータと、
検出対象ガスの濃度を表示する表示器、とを有するガス検出装置において、
前記マイクロコンピュータは、
前記ポンプにより前記ガスセンサへ一定量の被検出雰囲気を導入した後、第１の時間内のガスセンサの信号から、検出対象ガスの有無を定性する定性部と、
前記ガスセンサへ一定量の被検出雰囲気を導入した後、前記第１の時間よりも長い第２の時間の間、ガスセンサの信号を積算することにより、検出対象ガスの濃度を定量する定量部と、
前記定性部で検出対象ガスが無いと定性した場合、定性結果を前記表示器に表示する出力インターフェース、とを備え、
検出対象ガスは呼気中のエタノールで、
ガス検出装置の温度を測定する温度センサを備え、
前記定性部は、前記第１の時間内のガスセンサの信号のピーク値を、温度センサの信号により補正することにより、検出対象ガスの濃度を求め、求めた検出対象ガスの濃度が所定値未満の場合に検出対象ガスが無いと定性し、
前記定性部が検出対象ガスが無いと定性した場合、前記表示器は検出対象ガスの濃度を０と表示するように構成され、かつ
前記定量部は検出対象ガスの濃度が所定値以上の場合にのみ定量を行うように構成されている、ことを特徴とする、ガス検出装置。 An electrochemical gas sensor comprising an electrolyte, a detection electrode and a counter electrode, and transporting protons or hydroxide ions generated by decomposing the detection target gas at the detection electrode to the counter electrode via the electrolyte;
A pump for introducing a certain amount of detected atmosphere into the gas sensor;
A microcomputer for obtaining the concentration of the detection target gas from the signal of the gas sensor;
In a gas detection device having a display for displaying the concentration of the detection target gas,
The microcomputer is
A qualitative portion for qualifying the presence or absence of a detection target gas from a signal of a gas sensor within a first time after introducing a certain amount of a detected atmosphere into the gas sensor by the pump;
A quantitative unit that quantifies the concentration of the detection target gas by integrating the gas sensor signals for a second time longer than the first time after introducing a certain amount of the atmosphere to be detected into the gas sensor;
An output interface for displaying a qualitative result on the display when the qualitative unit qualifies that there is no detection target gas ,
The detection target gas is ethanol in exhaled breath.
It has a temperature sensor that measures the temperature of the gas detector,
The qualitative unit obtains the concentration of the detection target gas by correcting the peak value of the signal of the gas sensor within the first time with the signal of the temperature sensor, and the concentration of the detected detection target gas is less than a predetermined value Qualify that there is no detection target gas,
When the qualitative unit qualifies that there is no detection target gas, the indicator is configured to display the concentration of the detection target gas as 0, and
The gas detection device according to claim 1, wherein the quantification unit is configured to perform quantification only when the concentration of the detection target gas is equal to or higher than a predetermined value .
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