WO2020130611A1 - Gas concentration measuring device and gas concentration measuring method using same - Google Patents
Gas concentration measuring device and gas concentration measuring method using same Download PDFInfo
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- WO2020130611A1 WO2020130611A1 PCT/KR2019/017972 KR2019017972W WO2020130611A1 WO 2020130611 A1 WO2020130611 A1 WO 2020130611A1 KR 2019017972 W KR2019017972 W KR 2019017972W WO 2020130611 A1 WO2020130611 A1 WO 2020130611A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/4067—Means for heating or controlling the temperature of the solid electrolyte
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/48—Other medical applications
- A61B5/4845—Toxicology, e.g. by detection of alcohol, drug or toxic products
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/497—Physical analysis of biological material of gaseous biological material, e.g. breath
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/497—Physical analysis of biological material of gaseous biological material, e.g. breath
- G01N33/4972—Determining alcohol content
Definitions
- the present invention relates to a gas concentration measuring apparatus, and more particularly, to a semiconductor-type gas concentration measuring apparatus for detecting the concentration of a gas to be measured, such as acetone and alcohol at a low concentration contained in the exhalation of a subject.
- the present invention is a result of research conducted with the support of the Ministry of Trade, Industry and Energy and the Korea Industrial Technology Agency's "International Joint Technology Development Project”.
- the energy used by the human body is mainly glucose, blood sugar, protein, and body fat. It is known that the human body primarily uses blood sugar as energy, followed by protein and finally fat. Therefore, normally, blood sugar is used as the main energy source, but there are special situations, such as diabetes, fasting starvation, energy consumption due to intense exercise, and dietary conditions such as restriction of carbohydrate intake. Body fat is used as an energy source.
- ketone body When the human body uses body fat as an energy source, a ketone body is produced as a product of fat decomposition.
- This ketone body is a generic term for three substances including acetoacetic acid, ⁇ -hydroxybutyric acid and acetone produced by decarbonation of these substances. It is known that ketone bodies are produced in the liver of the human body, circulate through the blood, and are used as an energy source in the brain, and the rest are excreted as exhalation gas and urine through the lungs. If it is possible to detect a trace amount of ketone body in blood, it is possible to know how much body fat is being burned, so detection of ketone body in blood can be very useful for diet programs aimed at reducing body fat.
- Urine and blood tests are the most common methods for determining the concentration of ketone bodies in the human body.
- Urine test is a method of determining the concentration of ketone bodies in the human body through a change in color of a test strip according to the concentration of ketone bodies contained in urine, and has a merit of a relatively simple measurement method.
- the urine test is an inadequate means of knowing the current concentration because it is a means of telling the concentration of ketones in the body about 4 hours ago.
- it is not suitable for quantitative analysis because the test results vary greatly depending on the amount of water intake and the like.
- the method by blood test can quantitatively measure the amount of ketones present in the blood relatively accurately, but there is a hassle of taking blood.
- a technique for measuring the amount of ketone bodies in blood by analyzing aerobic gas has been recently studied. Since the acetone contained in the exhalation gas is closely related to the amount of ketone body contained in the blood, the amount of the ketone body in the blood can be calculated by measuring the amount of acetone contained in the exhalation gas.
- the aerobic gas mainly contains acetone among ketone bodies.
- U.S. Patent No. 4,970,172 discloses a method for measuring the amount of acetone by reacting acetone contained in an exhalation gas with a matrix material comprising a nitroprusside salt and an amine.
- U.S. Patent No. 8,871,521 discloses an apparatus comprising a container with a powder that changes color when reacted with a ketone body (mainly acetone) contained in aerobic gas.
- this method has a problem that it is impossible to measure the amount of ketone contained in aerobic gas in real time.
- US Patent Publication No. 2003-0208133 discloses a method of measuring metabolic rate and the amount of ketone body contained in aerobic gas, and estimating body fat decomposition amount using the measured metabolic rate and ketone body amount. have.
- these devices have a complicated structure and are difficult to carry.
- Korean Patent Publication No. 2003-0009013 discloses a method of measuring the amount of ketone contained in the exhaled gas collected by the exhaled gas collecting unit using a semiconductor-type ketone gas sensor.
- U.S. Patent No. 9,456,749 discloses a portable electronic device that measures ketone concentration using a metal oxide sensor.
- the method using the semiconductor gas sensor has a problem that it is difficult to distinguish acetone from other components included in the exhalation gas due to poor selectivity and stability.
- An object of the present invention is to improve the above-mentioned problems, and to provide a semiconductor-type gas concentration measuring device and a gas concentration measuring method capable of quickly and accurately measuring the concentration of a gas to be measured at a low concentration.
- an exhalation passage through which exhalation flows;
- a sample gas chamber in communication with the exhalation passage, through which a sample gas which is a part of the exhalation flowing in the exhalation passage is introduced;
- a semiconductor gas sensor disposed inside the sample gas chamber and including a sensing unit for generating an electric signal according to the concentration of the gas to be measured and a heater for heating the sensing unit;
- a gas concentration measuring method using a gas concentration measuring apparatus comprising a controller for controlling the heater, receiving an electric signal from the semiconductor gas sensor, and calculating a concentration of the gas to be measured,
- step b) calculating the concentration of the gas to be measured by receiving, and if it is determined in step b) that the detector is stable, step e) after step b) proceeds, and in step b), the detector If it is determined to be unstable, a method for measuring gas concentration in which steps c), d) and e) are sequentially performed after step b) is provided.
- the step a) provides a method for measuring gas concentration including a high temperature warm-up step of applying an accelerated warm-up power Pw that is 10 to 50% greater than the heater power Pm of the measurement step.
- step a) provides a method for measuring gas concentration, including a general warm-up step of applying a heater power (Pm) for the heater.
- Pm heater power
- a gas concentration measuring method further comprising the step of applying a high temperature warm-up power (Pw) to the heater immediately before the step d).
- a gas concentration measuring method further comprising the step of applying a high-temperature warm-up power (Pw) for 8 to 12 seconds to the heater immediately before the step d).
- Pw high-temperature warm-up power
- the step c) provides a gas concentration measuring method comprising the step of turning off the heater after a predetermined time (Ta) when the exhalation flows into the exhalation passage.
- step c) when the step c) is completed, a method for measuring the gas concentration that automatically enters the step d) is provided.
- an exhalation passage through which exhalation flows;
- a sample gas chamber in communication with the exhalation passage, through which a sample gas which is a part of the exhalation flowing in the exhalation passage is introduced;
- a semiconductor gas sensor disposed inside the sample gas chamber and including a sensing unit for generating an electric signal according to the concentration of the gas to be measured and a heater for heating the sensing unit;
- the gas concentration measuring apparatus comprising a controller for controlling the heater, and receiving an electrical signal from the semiconductor gas sensor, to calculate the concentration of the gas to be measured,
- the controller includes: a) a warm-up step of heating the sensing unit by applying power to the heater, and b) a measurement step of stabilization determining the resistance value of the sensing unit while the heater power Pm is applied to the heater. W, c) Waiting for measurement to apply heater power Pm to the heater after the exhalation flows into the exhalation passage, and d) When the exhalation flows into the exhalation passage, an electrical signal from the semiconductor gas sensor It is configured to perform the step of calculating the concentration of the gas to be measured by receiving,
- step b) determines whether the sensing unit is stable, performs step d) after step b), and if it is determined in step b) that the sensing unit is unstable, after step b) the c It provides a gas concentration measuring device configured to sequentially perform steps) and d).
- the gas concentration measuring apparatus has the advantage of being able to quickly and accurately measure the concentration of the gas to be measured at a low concentration.
- FIG. 1 is a configuration diagram of a gas concentration measuring apparatus according to an embodiment of the present invention.
- FIG. 2 is a flow chart of a gas concentration measurement method according to an embodiment of the present invention.
- the gas concentration measuring device is a semiconductor gas sensor 5 disposed inside the sample gas chamber 3 and the sample gas chamber 3 communicating with the exhalation passage 2, the exhalation passage 2. , A controller 6 and a display 7.
- the exhalation passage 2 is in the form of a cylinder with both ends open.
- a blower 1 may be coupled to the inlet 23 of one end of the exhalation passage 2.
- the exhalation introduced into the exhalation passage 2 through the fire zone 1 is discharged to the outside through the outlet 24 of the other end of the exhalation passage 2.
- the outlet 24 is formed to an appropriate size so as not to apply excessive pressure in the exhalation passage 2.
- the outlet 24 may be made of a plurality of through holes.
- the discharge port 24 also serves to discharge saliva or the like of the person included in the exhalation to the outside.
- a pressure sensor or a microphone may be installed in the exhalation passage 2 or the other tube communicating with the exhalation passage 2 to check whether the subject is blowing out the exhalation.
- the sample gas chamber 3 is connected to the sampling hole 21 of the exhalation passage 2 through the sample gas inlet pipe 31. On the other side, a sample gas discharge pipe (33) is installed. A semiconductor gas sensor 5 is installed inside the sample gas chamber 3.
- the resistance value of the semiconductor gas sensor 5 changes according to the concentration of the gas to be measured of the sample gas. For example, as the concentration of the gas to be measured increases, the resistance value decreases.
- concentration of the gas to be measured increases, the resistance value decreases.
- the semiconductor gas sensor 5 is equipped with a heater for heating the sensing unit and the sensing unit.
- the semiconductor gas sensor 5 may include a ceramic substrate and an electrode pattern formed on both surfaces of the ceramic substrate, a heater pattern, and a sensing unit that is a sensing material of a thick film applied on the electrode pattern.
- the semiconductor gas sensor 5 can measure the concentration of acetone by measuring a change in the resistance value of the sensing unit through the electrode pattern. The resistance value can be measured by changing the current flowing through the sensing unit or the voltage between the sensing units.
- the controller 6 serves to control a heater that heats the sensing portion of the semiconductor gas sensor. In addition, the controller 6 serves to calculate the acetone concentration value according to the electric signal value received from the semiconductor gas sensor 5.
- the display unit 7 may be a display device that displays the acetone concentration value or the like calculated by the controller 6.
- the display unit 7 may further include a speaker for transmitting a warning signal.
- the controller 7 When the gas concentration measuring device is turned on and the start button is pressed, the controller 7 first determines how much time has passed since the previous acetone concentration measurement (S1).
- the general warm-up step S2 proceeds, and if it exceeds this, the high-temperature warm-up step S3 proceeds.
- the process proceeds to a high-temperature warm-up step (S3) in which more energy is used, otherwise, to the general warm-up step (S2).
- S3 high-temperature warm-up step
- S2 general warm-up step
- the acetone contained in the exhalation has a very low concentration of several ppm, so the stabilization of the semiconductor gas sensor 5 is very important.
- the heater power Pm of the measurement step is applied to the heater of the semiconductor gas sensor 5 for about 20 to 30 seconds.
- oxygen gas is adsorbed on the surface of the thick film, which is the sensing unit, and free electrons are trapped in the oxygen gas, thereby increasing the resistance value of the sensing unit.
- the high-temperature warm-up power (Pw) of 10 to 50% larger than the measurement step heater power (Pm) is applied to the heater of the semiconductor gas sensor 5 for about 20 to 60 seconds.
- the high-temperature warm-up power (Pw) may be applied to the entire stage, but the high-temperature warm-up power (Pw) may be applied only in some sections, and the measurement step heater power (Pm) may be applied in the remaining sections.
- the high-temperature warm-up power Pw may be applied in the first 30 seconds, and the heater power Pm in the measurement step may be applied in the latter 30 seconds.
- a stabilization determination step (S4) of measuring the resistance value of the sensing unit is performed in a state in which the heater power Pm is applied to the heater.
- the stabilization determination step for example, if the resistance value of the sensing unit is greater than or equal to a predetermined value, it is determined that the sensing unit is stable, and if it is less than a predetermined value, it is determined that it is unstable.
- the stabilization determination step (S4) it is possible to inform the operator that warming up is completed through the display unit 7. Then, the measurer guides the subject to inhale the exhalation passage 2 through the fire 1.
- the heater of the semiconductor type gas sensor 5 is turned off after a predetermined time (Ta) (S5). Whether the exhalation flows into the exhalation passage 2 can be confirmed through a pressure sensor or a microphone installed in the exhalation passage 2.
- the exhalation flows into the exhalation passage 2, and a part of the exhalation flows into the sample gas chamber 3 and then passes through the sample gas discharge pipe 33. It is discharged to the outside. In this process, contaminants such as odor components remaining inside the sample gas chamber 3 are discharged to the outside of the sample gas chamber 3 with exhalation. In addition, as the contaminants attached to the surface of the sensing portion of the semiconductor gas sensor 5 are removed, oxygen is adsorbed to the sensing portion of the semiconductor gas sensor 5, and the resistance value of the sensing portion is significantly increased.
- the heater power Pm is automatically applied to the heater again to enter the measurement standby stage (S6).
- the high-temperature warm-up power Pw may be applied for 8 to 12 seconds before the measurement step heater power Pm is applied.
- the measurement unit When the measurement waiting step is completed, the measurement unit is notified through the display unit 7 that the measurement is ready. The tester in turn causes the testee to breathe the exhalation passage 2 through the fire 1.
- the sample gas that is part of the exhalation flows into the sample gas chamber 3, and the resistance value of the sensing unit is changed by the acetone included in the exhalation.
- the controller 6 receives the electric signal according to the change of the resistance value, and measures the acetone concentration included in the exhalation. And based on this, it is also possible to calculate the concentration of acetone in the blood. In addition, the amount of body fat burned can be calculated based on the concentration of acetone in the blood.
- the sensing unit is judged to be in a stable state.
- the acetone concentration is measured immediately (S7) immediately after the stabilization determination step (S4). That is, the stabilization determination step (S4) also serves as a measurement waiting step.
- the measurement step heater power Pm is applied in the stabilization determination step S4, it is not necessary to go through the measurement standby step again after the stabilization determination step S4.
- measurement may be completed in about 2 to 5 minutes.
- the process proceeds to a high-temperature warm-up step or a general warm-up step depending on the elapsed time after the recent measurement of acetone concentration, but depending on the use, the elapsed time may not be determined, and the process may proceed to the general warm-up step.
- the process may proceed to the high temperature warm-up step regardless of the elapsed time.
- the gas concentration measuring apparatus and gas concentration measuring method of the present invention can be used even when other gases such as alcohol are used as the gas to be measured.
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Abstract
The present invention relates to a gas concentration measuring device. The present invention relates to a gas concentration measuring method using a gas concentration measuring device, and the gas concentration measuring device comprises: an exhalation path through which exhalation flows; a sample gas chamber which is in communication with the exhalation path and into which a sample gas which is a part of the exhalation flowing in the exhalation path is introduced; a semiconductor gas sensor which is arranged in the sample gas chamber and which comprises a sensor for generating an electrical signal according to the concentration of the gas being measured and a heater for heating the sensor; and a controller which controls the heater and receives the electrical signal from the semiconductor gas sensor to calculate the concentration of the gas being measured. The gas concentration measuring method comprises: a) a warming-up step for heating the sensor by applying electric power to the heater; b) a stabilization determination step for measuring a resistance value of the sensor in a state in which a measurement step heater power (Pm) is applied to the heater; c) a step for introducing exhalation into the exhalation path; d) a measurement standby step for applying the measurement step heater power (Pm) to the heater; and e) a step for calculating the concentration of the gas being measured by receiving the electrical signal from the semiconductor gas sensor, when the exhalation is introduced into the exhalation path, wherein if it is determined that the sensor is stable in step b), then step e) is performed after step b), and if it is determined that the sensor is unstable in step b), then step c), step d), and step e) are sequentially performed after step b).
Description
본 발명은 가스 농도 측정장치에 관한 것으로서, 더욱 상세하게는 피측정자의 날숨에 포함되어 있는 저농도의 아세톤, 알코올 등의 측정 대상 가스의 농도를 검출하는 반도체식 가스 농도 측정장치에 관한 것이다.The present invention relates to a gas concentration measuring apparatus, and more particularly, to a semiconductor-type gas concentration measuring apparatus for detecting the concentration of a gas to be measured, such as acetone and alcohol at a low concentration contained in the exhalation of a subject.
본 발명은 산업통상자원부와 한국산업기술진흥원의 "국제공동기술개발사업"의 지원을 받아 수행된 연구결과이다.The present invention is a result of research conducted with the support of the Ministry of Trade, Industry and Energy and the Korea Industrial Technology Agency's "International Joint Technology Development Project".
인체가 사용하는 에너지는 주로 글루코오스로 불리는 혈당과 단백질 그리고 체지방이다. 인체는 일차적으로는 혈당을 에너지로 사용하고 그 다음에 단백질 그리고 최종적으로 지방을 사용하는 것으로 알려져 있다. 따라서 평상시에는 혈당을 주 에너지원으로 사용하지만 특수한 상황, 예를 들어, 당뇨병이 있거나, 단식에 의한 기아상태, 격심한 운동 등에 의한 에너지 소모 상태, 탄수화물 섭취의 제한과 같은 식이 요법 진행 등의 특수한 상황에는 체지방을 에너지원으로 사용하게 된다.The energy used by the human body is mainly glucose, blood sugar, protein, and body fat. It is known that the human body primarily uses blood sugar as energy, followed by protein and finally fat. Therefore, normally, blood sugar is used as the main energy source, but there are special situations, such as diabetes, fasting starvation, energy consumption due to intense exercise, and dietary conditions such as restriction of carbohydrate intake. Body fat is used as an energy source.
인체가 체지방을 에너지원으로 사용하게 되면 지방 분해의 산물로써 케톤체(ketone body)가 생성된다. 이 케톤체는 아세토아세트산, β-히드록시부티르산 및 이러한 물질이 탈 탄산되어 생성된 아세톤을 포함한 3가지 물질의 총칭이다. 케톤체는 인체의 간에서 생성되어 혈액을 통하여 순환하다가 뇌에서 에너지원으로 사용되고, 나머지는 폐를 통한 호기 가스와 소변으로 배설되는 것으로 알려져 있다. 극미량인 혈중 케톤체를 검출할 수 있다면 체지방이 어느 정도 연소 되고 있는지를 알 수 있으므로, 혈중 케톤체 검출은 체지방 감량을 목표로 하는 다이어트 프로그램에 매우 유용하게 사용할 수 있다.When the human body uses body fat as an energy source, a ketone body is produced as a product of fat decomposition. This ketone body is a generic term for three substances including acetoacetic acid, β-hydroxybutyric acid and acetone produced by decarbonation of these substances. It is known that ketone bodies are produced in the liver of the human body, circulate through the blood, and are used as an energy source in the brain, and the rest are excreted as exhalation gas and urine through the lungs. If it is possible to detect a trace amount of ketone body in blood, it is possible to know how much body fat is being burned, so detection of ketone body in blood can be very useful for diet programs aimed at reducing body fat.
인체 내의 케톤체 농도를 알아낼 수 있는 방법으로는 소변 검사와 혈액 검사에 의한 방법이 가장 일반적이다.Urine and blood tests are the most common methods for determining the concentration of ketone bodies in the human body.
소변 검사는 소변에 포함된 케톤체 농도에 따른 검사지의 색깔의 변화를 통해서 인체 내의 케톤체 농도를 알아내는 방법으로서 비교적 간단한 측정 방식이라는 장점이 있다. 그러나 소변 검사는 약 4시간 전의 인체 내 케톤체 농도를 알려주는 수단이기 때문에 현재의 농도를 알기 위한 수단으로는 부적합하다. 또한, 수분 섭취량 등에 따라서 검사결과가 크게 차이 나기 때문에 정량적인 분석법으로는 적당치 않다.Urine test is a method of determining the concentration of ketone bodies in the human body through a change in color of a test strip according to the concentration of ketone bodies contained in urine, and has a merit of a relatively simple measurement method. However, the urine test is an inadequate means of knowing the current concentration because it is a means of telling the concentration of ketones in the body about 4 hours ago. In addition, it is not suitable for quantitative analysis because the test results vary greatly depending on the amount of water intake and the like.
혈액 검사에 의한 방법은 현재 혈액에 존재하는 케톤체량을 비교적 정확하게 정량적으로 측정할 수는 있으나, 혈액을 채취해야 하는 번거로움이 있다.The method by blood test can quantitatively measure the amount of ketones present in the blood relatively accurately, but there is a hassle of taking blood.
상기한 케톤체 농도 측정법 이외에 호기 가스를 분석하여 혈중 케톤체량을 측정하는 기술이 최근에 연구된 바 있다. 호기 가스에 포함된 아세톤은 혈액에 포함된 케톤체량과 밀접한 관련이 있으므로, 호기 가스에 포함된 아세톤량을 측정하면 혈중 케톤체량을 계산할 수 있다. 호기 가스에는 케톤체 중에서 아세톤이 주로 포함되어 있다.In addition to the above-described method for measuring the concentration of ketone bodies, a technique for measuring the amount of ketone bodies in blood by analyzing aerobic gas has been recently studied. Since the acetone contained in the exhalation gas is closely related to the amount of ketone body contained in the blood, the amount of the ketone body in the blood can be calculated by measuring the amount of acetone contained in the exhalation gas. The aerobic gas mainly contains acetone among ketone bodies.
예를 들어, 미국특허 제4,970,172호에는 호기 가스에 포함된 아세톤을 니트로프루시드 염과 아민을 포함하는 매트릭스 물질과 반응시켜서 아세톤의 양을 측정하는 방법이 개시되어 있다. 또한, 미국특허 제8,871,521호에는 호기 가스에 포함된 케톤체(주로 아세톤)와 반응하면 색이 변화하는 파우더를 구비한 컨테이너를 포함하는 장치가 개시되어 있다. 그러나 이러한 방법은 실시간으로 호기 가스에 포함된 케톤체량을 측정할 수 없다는 문제가 있다. For example, U.S. Patent No. 4,970,172 discloses a method for measuring the amount of acetone by reacting acetone contained in an exhalation gas with a matrix material comprising a nitroprusside salt and an amine. In addition, U.S. Patent No. 8,871,521 discloses an apparatus comprising a container with a powder that changes color when reacted with a ketone body (mainly acetone) contained in aerobic gas. However, this method has a problem that it is impossible to measure the amount of ketone contained in aerobic gas in real time.
이러한 문제점을 개선하기 위한 방법으로서, 미국공개특허 제2003-0208133호에는 대사율과 호기 가스에 포함된 케톤체량을 측정하고, 측정된 대사율과 케톤체량을 이용하여 체지방 분해량을 추정하는 방법이 개시되어 있다. 그러나 이러한 장치는 구조가 복잡하며, 휴대가 어렵다는 문제가 있다.As a method for improving this problem, US Patent Publication No. 2003-0208133 discloses a method of measuring metabolic rate and the amount of ketone body contained in aerobic gas, and estimating body fat decomposition amount using the measured metabolic rate and ketone body amount. have. However, these devices have a complicated structure and are difficult to carry.
또한, 한국공개특허 특2003-0009013호에는 호기 가스 채취부에서 채취한 호기 가스에 포함된 케톤체량을 반도체식 케톤 가스 센서를 이용하여 측정하는 방법이 개시되어 있다. 또한, 미국특허 제9,456,749호에는 금속 산화물 센서를 이용하여 케톤체 농도를 측정하는 휴대형 전자장치가 개시되어 있다. 그러나 이러한 반도체식 가스 센서를 이용하는 방법은 선택성과 안정성이 떨어져서, 호기 가스에 포함된 다른 성분과 아세톤의 구별이 어렵다는 문제가 있다.In addition, Korean Patent Publication No. 2003-0009013 discloses a method of measuring the amount of ketone contained in the exhaled gas collected by the exhaled gas collecting unit using a semiconductor-type ketone gas sensor. In addition, U.S. Patent No. 9,456,749 discloses a portable electronic device that measures ketone concentration using a metal oxide sensor. However, the method using the semiconductor gas sensor has a problem that it is difficult to distinguish acetone from other components included in the exhalation gas due to poor selectivity and stability.
또한, 1ppm 이하의 저농도를 감지하기 위해서는 반도체식 가스 센서를 완전히 안정시키기 위해서 1시간가량의 워밍업이 필요하다는 문제도 있었다. 충분히 안정화되지 않은 상태에서 측정을 하게 되면 아세톤 농도가 높은 것으로 잘못 측정되거나 아세톤이 없는 경우에도 아세톤이 있는 것으로 오작동할 가능성이 크다.In addition, there is a problem that a warm-up of about 1 hour is required to completely stabilize the semiconductor gas sensor in order to detect a low concentration of 1 ppm or less. If the measurement is not sufficiently stabilized, there is a high possibility of malfunction due to the presence of acetone even if the acetone concentration is incorrectly measured as high or there is no acetone.
위에서는 아세톤을 예로 들어서 설명을 하였으나, 아세톤 이외의 알코올 등 다른 저농도의 가스를 감지하는 경우에도 동일한 문제가 발생할 수 있다.In the above, the description was made using acetone as an example, but the same problem may occur when detecting other low concentration gas such as alcohol other than acetone.
[선행기술문헌][Advanced technical literature]
미국특허 제4,970,172호U.S. Patent No. 4,970,172
미국특허 제8,871,521호U.S. Patent No. 8,871,521
미국공개특허 제2003-0208133호US Patent Publication No. 2003-0208133
한국공개특허 특2003-0009013호Korean Patent Publication No. 2003-0009013
미국특허 제9,456,749호U.S. Patent No. 9,456,749
미국특허 제7,790,467호U.S. Patent No. 7,790,467
미국특허 제9,089,279호U.S. Patent No. 9,089,279
본 발명은 상술한 문제점을 개선하기 위한 것으로서, 저농도의 측정 대상 가스의 농도를 빠르고 정확하게 측정할 수 있는 반도체식 가스 농도 측정장치 및 가스 농도 측정방법을 제공하는 것을 목적으로 한다.An object of the present invention is to improve the above-mentioned problems, and to provide a semiconductor-type gas concentration measuring device and a gas concentration measuring method capable of quickly and accurately measuring the concentration of a gas to be measured at a low concentration.
상술한 목적을 달성하기 위해서, 본 발명은, 날숨이 흐르는 날숨 통로와; 상기 날숨 통로와 연통되며, 상기 날숨 통로에 흐르는 날숨의 일부인 시료가스가 유입되는 시료가스챔버와; 상기 시료가스챔버의 내부에 배치되며, 측정 대상 가스의 농도에 따른 전기신호를 발생시키는 감지부와, 상기 감지부를 가열하는 히터를 포함하는 반도체식 가스센서와; 상기 히터를 제어하고, 상기 반도체식 가스센서로부터 전기신호를 수신하여, 측정 대상 가스의 농도를 연산하는 제어기를 포함하는 가스 농도 측정장치를 이용한 가스 농도 측정방법으로서,In order to achieve the above object, the present invention, an exhalation passage through which exhalation flows; A sample gas chamber in communication with the exhalation passage, through which a sample gas which is a part of the exhalation flowing in the exhalation passage is introduced; A semiconductor gas sensor disposed inside the sample gas chamber and including a sensing unit for generating an electric signal according to the concentration of the gas to be measured and a heater for heating the sensing unit; A gas concentration measuring method using a gas concentration measuring apparatus comprising a controller for controlling the heater, receiving an electric signal from the semiconductor gas sensor, and calculating a concentration of the gas to be measured,
a) 상기 히터에 전력을 인가하여 상기 감지부를 가열하는 워밍업 단계와, b) 상기 히터에 측정단계 히터 전력(Pm)이 인가된 상태에서 상기 감지부의 저항값을 측정하는 안정화 판단 단계와, c) 상기 날숨 통로에 날숨이 유입되는 단계와, d) 상기 히터에 측정단계 히터 전력(Pm)을 인가하는 측정 대기 단계와, e) 상기 날숨 통로에 날숨이 유입되면, 상기 반도체식 가스센서로부터 전기신호를 수신하여 측정 대상 가스의 농도를 연산하는 단계를 포함하며, 상기 b) 단계에서 상기 감지부가 안정한 것으로 판단되면, 상기 b) 단계 후 상기 e) 단계가 진행되고, 상기 b) 단계에서 상기 감지부가 불안정한 것으로 판단되면, 상기 b) 단계 후 상기 c), d) 및 e) 단계가 순차적으로 진행되는 가스 농도 측정방법을 제공한다.a) a warm-up step of applying the electric power to the heater to heat the sensing unit, and b) a stabilization determining step of measuring the resistance value of the sensing unit in a state in which the heater electric power Pm is applied to the heater, and c) A step in which exhalation is introduced into the exhalation passage; d) a measurement standby step in which heater power (Pm) is applied to the heater; and e) an electrical signal from the semiconductor gas sensor when exhalation is introduced into the exhalation passage. And calculating the concentration of the gas to be measured by receiving, and if it is determined in step b) that the detector is stable, step e) after step b) proceeds, and in step b), the detector If it is determined to be unstable, a method for measuring gas concentration in which steps c), d) and e) are sequentially performed after step b) is provided.
또한, 상기 a) 단계는 상기 히터에 측정단계 히터 전력(Pm)보다 10 내지 50% 큰 가속 워밍업 전력(Pw)을 인가하는 고온 워밍업 단계를 포함하는 가스 농도 측정방법을 제공한다.In addition, the step a) provides a method for measuring gas concentration including a high temperature warm-up step of applying an accelerated warm-up power Pw that is 10 to 50% greater than the heater power Pm of the measurement step.
또한, 상기 a) 단계는 상기 히터에 측정단계 히터 전력(Pm)을 인가하는 일반 워밍업 단계를 포함하는 가스 농도 측정방법을 제공한다.In addition, step a) provides a method for measuring gas concentration, including a general warm-up step of applying a heater power (Pm) for the heater.
또한, 상기 d) 단계 직전에 상기 히터에 고온 워밍업 전력(Pw)을 인가하는 단계를 더 포함하는 가스 농도 측정방법을 제공한다.In addition, it provides a gas concentration measuring method further comprising the step of applying a high temperature warm-up power (Pw) to the heater immediately before the step d).
또한, 상기 d) 단계 직전에 상기 히터에 고온 워밍업 전력(Pw)을 8 내지 12초 인가하는 단계를 더 포함하는 가스 농도 측정방법을 제공한다. In addition, it provides a gas concentration measuring method further comprising the step of applying a high-temperature warm-up power (Pw) for 8 to 12 seconds to the heater immediately before the step d).
또한, 상기 c) 단계는 상기 날숨 통로에 날숨이 유입되면, 미리 정해진 시간(Ta)이 지난 후 상기 히터를 끄는 단계를 포함하는 가스 농도 측정방법을 제공한다.In addition, the step c) provides a gas concentration measuring method comprising the step of turning off the heater after a predetermined time (Ta) when the exhalation flows into the exhalation passage.
또한, 상기 c) 단계가 종료되면 자동으로 상기 d) 단계로 진입하는 가스 농도 측정방법을 제공한다.In addition, when the step c) is completed, a method for measuring the gas concentration that automatically enters the step d) is provided.
또한, 본 발명은, 날숨이 흐르는 날숨 통로와; 상기 날숨 통로와 연통되며, 상기 날숨 통로에 흐르는 날숨의 일부인 시료가스가 유입되는 시료가스챔버와; 상기 시료가스챔버의 내부에 배치되며, 측정 대상 가스의 농도에 따른 전기신호를 발생시키는 감지부와, 상기 감지부를 가열하는 히터를 포함하는 반도체식 가스센서와; 상기 히터를 제어하고, 상기 반도체식 가스센서로부터 전기신호를 수신하여, 측정 대상 가스의 농도를 연산하는 제어기를 포함하는 가스 농도 측정장치에 있어서,In addition, the present invention, an exhalation passage through which exhalation flows; A sample gas chamber in communication with the exhalation passage, through which a sample gas which is a part of the exhalation flowing in the exhalation passage is introduced; A semiconductor gas sensor disposed inside the sample gas chamber and including a sensing unit for generating an electric signal according to the concentration of the gas to be measured and a heater for heating the sensing unit; In the gas concentration measuring apparatus comprising a controller for controlling the heater, and receiving an electrical signal from the semiconductor gas sensor, to calculate the concentration of the gas to be measured,
상기 제어기는, ㄱ) 상기 히터에 전력을 인가하여 상기 감지부를 가열하는 워밍업 단계와, ㄴ) 상기 히터에 측정단계 히터 전력(Pm)이 인가된 상태에서 상기 감지부의 저항값을 측정하는 안정화 판단 단계와, ㄷ) 상기 날숨 통로에 날숨이 유입된 후 상기 히터에 측정단계 히터 전력(Pm)을 인가하는 측정 대기 단계와, ㄹ) 상기 날숨 통로에 날숨이 유입되면, 상기 반도체식 가스센서로부터 전기신호를 수신하여 측정 대상 가스의 농도를 연산하는 단계를 수행하도록 구성되며,The controller includes: a) a warm-up step of heating the sensing unit by applying power to the heater, and b) a measurement step of stabilization determining the resistance value of the sensing unit while the heater power Pm is applied to the heater. W, c) Waiting for measurement to apply heater power Pm to the heater after the exhalation flows into the exhalation passage, and d) When the exhalation flows into the exhalation passage, an electrical signal from the semiconductor gas sensor It is configured to perform the step of calculating the concentration of the gas to be measured by receiving,
상기 제어기는, 상기 ㄴ) 단계에서 상기 감지부가 안정한 것으로 판단되면, 상기 ㄴ) 단계 후 상기 ㄹ) 단계를 수행하고, 상기 ㄴ) 단계에서 상기 감지부가 불안정한 것으로 판단되면, 상기 ㄴ) 단계 후 상기 ㄷ) 및 ㄹ) 단계를 순차적으로 수행하도록 구성된 가스 농도 측정장치를 제공한다.The controller, if it is determined in step b) that the sensing unit is stable, performs step d) after step b), and if it is determined in step b) that the sensing unit is unstable, after step b) the c It provides a gas concentration measuring device configured to sequentially perform steps) and d).
본 발명에 따른 가스 농도 측정장치는 저농도의 측정 대상 가스의 농도를 빠르고 정확하게 측정할 수 있다는 장점이 있다.The gas concentration measuring apparatus according to the present invention has the advantage of being able to quickly and accurately measure the concentration of the gas to be measured at a low concentration.
도 1은 본 발명의 일실시예에 따른 가스 농도 측정장치의 구성도이다.1 is a configuration diagram of a gas concentration measuring apparatus according to an embodiment of the present invention.
도 2는 본 발명의 일실시예에 따른 가스 농도 측정방법의 순서도이다.2 is a flow chart of a gas concentration measurement method according to an embodiment of the present invention.
이하, 본 발명의 바람직한 실시예를 첨부된 도면들에 의거하여 상세하게 설명한다. 다음에 소개되는 실시예는 당업자에게 본 발명의 사상이 충분히 전달될 수 있도록 하기 위해 예로서 제공되는 것이다. 따라서 본 발명은 이하 설명되는 실시예에 한정되지 않고 다른 형태로 구체화될 수도 있다. 그리고 도면들에 있어서, 구성요소의 폭, 길이, 두께 등은 편의를 위하여 과장되어 표현될 수 있다. 명세서 전체에 걸쳐서 동일한 참조번호들은 동일한 구성요소들을 나타낸다.Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings. The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Therefore, the present invention is not limited to the embodiments described below and may be embodied in other forms. In addition, in the drawings, the width, length, and thickness of components may be exaggerated for convenience. Throughout the specification, the same reference numbers refer to the same components.
도 1은 본 발명의 일실시예에 따른 가스 농도 측정장치의 구성도이다. 도 1을 참고하면, 가스 농도 측정장치는 날숨 통로(2), 날숨 통로(2)와 연통된 시료가스챔버(3), 시료가스챔버(3)의 내부에 배치된 반도체식 가스센서(5), 제어기(6) 및 표시부(7)를 포함한다.1 is a configuration diagram of a gas concentration measuring apparatus according to an embodiment of the present invention. Referring to FIG. 1, the gas concentration measuring device is a semiconductor gas sensor 5 disposed inside the sample gas chamber 3 and the sample gas chamber 3 communicating with the exhalation passage 2, the exhalation passage 2. , A controller 6 and a display 7.
날숨 통로(2)는 양단이 개방되어 있는 실린더 형태이다. 날숨 통로(2) 일단의 유입구(23)에는 불대(1)가 결합할 수 있다. 불대(1)를 통해서 날숨 통로(2)로 유입된 날숨은 날숨 통로(2) 타단의 배출구(24) 통해서 외부로 배출된다. 배출구(24)는 날숨 통로(2) 안에 과중한 압력이 걸리지 않도록 적절한 크기로 형성된다. 배출구(24)는 복수 개의 관통 구멍으로 이루어질 수도 있다. 배출구(24)는 날숨에 포함된 피측정자의 타액 등을 외부로 배출하는 역할도 한다.The exhalation passage 2 is in the form of a cylinder with both ends open. A blower 1 may be coupled to the inlet 23 of one end of the exhalation passage 2. The exhalation introduced into the exhalation passage 2 through the fire zone 1 is discharged to the outside through the outlet 24 of the other end of the exhalation passage 2. The outlet 24 is formed to an appropriate size so as not to apply excessive pressure in the exhalation passage 2. The outlet 24 may be made of a plurality of through holes. The discharge port 24 also serves to discharge saliva or the like of the person included in the exhalation to the outside.
날숨 통로(2)에는 날숨 통로(2)에 유입된 날숨의 일부를 시료가스챔버(3)에 공급하기 위한 채취구멍(21)이 형성되어 있다. 날숨 통로(2)에 유입된 날숨의 상당부분은 배출구(24)를 통해서 바로 외부로 배출되고, 일부가 채취구멍(21)을 통해서 시료가스챔버(3)에 공급된다. 날숨 통로(2)를 흐르는 날숨 중에서 채취구멍(21)을 통해서 공급된 날숨을 시료가스라고 한다.In the exhalation passage 2, a sampling hole 21 for supplying a part of the exhalation introduced into the exhalation passage 2 to the sample gas chamber 3 is formed. A significant portion of the exhalation introduced into the exhalation passage 2 is discharged directly to the outside through the outlet 24, and a part is supplied to the sample gas chamber 3 through the sampling hole 21. The exhalation flowing through the sampling hole 21 among the exhalations flowing through the exhalation passage 2 is called a sample gas.
또한, 도시하지 않았으나, 날숨 통로(2) 또는 날숨 통로(2)와 연통된 다른 관에는 피측정자가 날숨을 불어넣었는지 확인하기 위한 압력센서나 마이크로폰이 설치될 수 있다.In addition, although not shown, a pressure sensor or a microphone may be installed in the exhalation passage 2 or the other tube communicating with the exhalation passage 2 to check whether the subject is blowing out the exhalation.
시료가스챔버(3)는 시료가스유입관(31)을 통해서 날숨 통로(2)의 채취구멍(21)과 연결된다. 반대쪽에는 시료가스배출관(33)이 설치된다. 시료가스챔버(3)의 내부에는 반도체식 가스센서(5)가 설치된다.The sample gas chamber 3 is connected to the sampling hole 21 of the exhalation passage 2 through the sample gas inlet pipe 31. On the other side, a sample gas discharge pipe (33) is installed. A semiconductor gas sensor 5 is installed inside the sample gas chamber 3.
반도체식 가스센서(5)는 시료가스의 측정 대상 가스의 농도에 따라서 저항값이 변화한다. 예를 들어, 측정 대상 가스의 농도가 높아질수록 저항값이 감소한다. 이하에서는 측정 대상 가스로 아세톤을 예로 들어서 설명한다. The resistance value of the semiconductor gas sensor 5 changes according to the concentration of the gas to be measured of the sample gas. For example, as the concentration of the gas to be measured increases, the resistance value decreases. Hereinafter, it will be described taking acetone as an example gas to be measured.
반도체식 가스센서(5)는 감지부와 감지부를 가열하기 위한 히터가 내장되어 있다. 예를 들어, 반도체식 가스센서(5)는 세라믹 기판과 세라믹 기판의 양면에 각각 형성된 전극 패턴과 히터 패턴 및 전극 패턴 위에 도포된 후막의 감지 물질인 감지부를 포함할 수 있다. 반도체식 가스센서(5)는 전극 패턴을 통해서 감지부의 저항값의 변화를 측정함으로써, 아세톤 농도를 측정할 수 있다. 저항값은 감지부에 흐르는 전류 또는 감지부 사이의 전압의 변화를 통해서 측정할 수 있다.The semiconductor gas sensor 5 is equipped with a heater for heating the sensing unit and the sensing unit. For example, the semiconductor gas sensor 5 may include a ceramic substrate and an electrode pattern formed on both surfaces of the ceramic substrate, a heater pattern, and a sensing unit that is a sensing material of a thick film applied on the electrode pattern. The semiconductor gas sensor 5 can measure the concentration of acetone by measuring a change in the resistance value of the sensing unit through the electrode pattern. The resistance value can be measured by changing the current flowing through the sensing unit or the voltage between the sensing units.
제어기(6)는 반도체식 가스센서의 감지부를 가열하는 히터를 제어하는 역할을 한다. 또한, 제어기(6)는 반도체식 가스센서(5)로부터 수신한 전기신호 값에 따라서 아세톤 농도 값을 연산하는 역할을 한다.The controller 6 serves to control a heater that heats the sensing portion of the semiconductor gas sensor. In addition, the controller 6 serves to calculate the acetone concentration value according to the electric signal value received from the semiconductor gas sensor 5.
표시부(7)는 제어기(6)에서 연산된 아세톤 농도 값 등을 표시하는 디스플레이 장치일 수 있다. 또한, 표시부(7)는 경고 신호를 전달하기 위한 스피커를 더 포함할 수 있다.The display unit 7 may be a display device that displays the acetone concentration value or the like calculated by the controller 6. In addition, the display unit 7 may further include a speaker for transmitting a warning signal.
이하, 도 2를 참고하여, 상술한 가스 농도 측정장치를 이용한 가스 농도 측정방법에 대해서 설명한다.Hereinafter, a gas concentration measuring method using the above-described gas concentration measuring apparatus will be described with reference to FIG. 2.
가스 농도 측정장치의 전원을 켜고 시작버튼을 누르면, 제어기(7)가 먼저, 직전 아세톤 농도 측정 후 시간이 얼마나 지났는지 판단한다(S1).When the gas concentration measuring device is turned on and the start button is pressed, the controller 7 first determines how much time has passed since the previous acetone concentration measurement (S1).
그리고 경과 시간이 정해진 시간, 예를 들어, 2시간 이하이면 일반 워밍업 단계(S2)가 진행되며, 이를 초과하면 고온 워밍업 단계(S3)가 진행된다.In addition, if the elapsed time is a predetermined time, for example, 2 hours or less, the general warm-up step S2 proceeds, and if it exceeds this, the high-temperature warm-up step S3 proceeds.
마지막 아세톤 농도 측정 후 오랜 시간이 지났으면, 외부 공기 중의 수분과 가스 성분이 시료가스챔버(3)에 유입되어서, 시료가스챔버(3) 내의 반도체식 가스센서(5)가 오염되었을 가능성이 증가한다. 이 경우에는 반도체식 가스센서(5)를 안정화시키기 위해서 더 많은 에너지가 사용되는 고온 워밍업 단계(S3)로 진행하며, 그렇지 않을 경우에는 일반 워밍업 단계(S2)로 진행한다. 날숨에 포함되어 있는 아세톤은 수 ppm 정도로 매우 농도가 낮기 때문에 반도체식 가스센서(5)의 안정화가 매우 중요하다.If a long time has elapsed since the last acetone concentration measurement, the likelihood of contamination of the semiconductor gas sensor 5 in the sample gas chamber 3 increases because moisture and gas components in the outside air flow into the sample gas chamber 3. . In this case, in order to stabilize the semiconductor gas sensor 5, the process proceeds to a high-temperature warm-up step (S3) in which more energy is used, otherwise, to the general warm-up step (S2). The acetone contained in the exhalation has a very low concentration of several ppm, so the stabilization of the semiconductor gas sensor 5 is very important.
일반 워밍업 단계(S2)에서는 반도체식 가스센서(5)의 히터에 측정단계 히터 전력(Pm)이 20 내지 30초 정도 인가된다. 히터에 의해서 감지부가 가열되면, 감지부인 후막의 표면에 산소 기체가 흡착되면서 산소 기체에 자유전자 포획되어, 감지부의 저항값이 증가한다.In the general warm-up step S2, the heater power Pm of the measurement step is applied to the heater of the semiconductor gas sensor 5 for about 20 to 30 seconds. When the sensing unit is heated by the heater, oxygen gas is adsorbed on the surface of the thick film, which is the sensing unit, and free electrons are trapped in the oxygen gas, thereby increasing the resistance value of the sensing unit.
고온 워밍업 단계(S3)에서는 반도체식 가스센서(5)의 히터에 측정단계 히터 전력(Pm)보다 10 내지 50% 큰 고온 워밍업 전력(Pw)이 20 내지 60초 정도 인가된다.In the high-temperature warm-up step (S3), the high-temperature warm-up power (Pw) of 10 to 50% larger than the measurement step heater power (Pm) is applied to the heater of the semiconductor gas sensor 5 for about 20 to 60 seconds.
고온 워밍업 단계(S3)에서는 단계 전체에 고온 워밍업 전력(Pw)이 인가될 수도 있으나, 일부 구간에서만 고온 워밍업 전력(Pw)이 인가되고, 나머지 구간에서 측정단계 히터 전력(Pm)이 인가될 수도 있다. 예를 들어, 처음 30초는 고온 워밍업 전력(Pw)이 인가되고, 나중 30초는 측정단계 히터 전력(Pm)이 인가될 수도 있다.In the high-temperature warm-up step (S3 ), the high-temperature warm-up power (Pw) may be applied to the entire stage, but the high-temperature warm-up power (Pw) may be applied only in some sections, and the measurement step heater power (Pm) may be applied in the remaining sections. . For example, the high-temperature warm-up power Pw may be applied in the first 30 seconds, and the heater power Pm in the measurement step may be applied in the latter 30 seconds.
다음, 워밍업이 완료되면, 히터에 측정단계 히터 전력(Pm)이 인가된 상태에서 상기 감지부의 저항값을 측정하는 안정화 판단 단계(S4)를 진행한다. 안정화 판단 단계에서는, 예를 들어, 감지부의 저항값이 미리 정해진 값 이상이면 감지부가 안정된 것으로 판단하며, 미리 정해진 값 미만이면 불안정한 것으로 판단한다.Next, when the warm-up is completed, a stabilization determination step (S4) of measuring the resistance value of the sensing unit is performed in a state in which the heater power Pm is applied to the heater. In the stabilization determination step, for example, if the resistance value of the sensing unit is greater than or equal to a predetermined value, it is determined that the sensing unit is stable, and if it is less than a predetermined value, it is determined that it is unstable.
먼저, 감지부가 불안정한 상태인 것으로 판단된 경우의 측정 단계에 대해서 설명한다.First, a measurement step in the case where the sensing unit is determined to be in an unstable state will be described.
안정화 판단 단계(S4)가 완료되면, 표시부(7)를 통해서 워밍업이 완료된 것을 측정자에게 알릴 수 있다. 그러면 측정자는 피측정자에게 불대(1)를 통해서 날숨 통로(2)에 날숨을 불어넣도록 안내한다.When the stabilization determination step (S4) is completed, it is possible to inform the operator that warming up is completed through the display unit 7. Then, the measurer guides the subject to inhale the exhalation passage 2 through the fire 1.
다음, 날숨 통로(2)에 날숨이 유입되면 미리 정해진 시간(Ta)이 지난 후 반도체식 가스센서(5)의 히터가 꺼진다(S5). 날숨 통로(2)에 날숨이 유입되는지는 날숨 통로(2)에 설치된 압력센서나 마이크로폰을 통해서 확인할 수 있다.Next, when the exhalation flows into the exhalation passage 2, the heater of the semiconductor type gas sensor 5 is turned off after a predetermined time (Ta) (S5). Whether the exhalation flows into the exhalation passage 2 can be confirmed through a pressure sensor or a microphone installed in the exhalation passage 2.
피측정자가 날숨 통로(2)에 날숨을 강하게 불어넣으면, 날숨 통로(2)에 날숨이 유입되고, 이 날숨의 일부가 시료가스챔버(3)로 유입된 후 시료가스배출관(33)을 통과하여 외부로 배출된다. 이 과정에서, 시료가스챔버(3) 내부에 남아있는 냄새 성분 등 오염 물질이 날숨과 함께 시료가스챔버(3)의 외부로 배출된다. 또한, 반도체식 가스센서(5)의 감지부 표면에 부착되어 있던 오염 물질들이 제거되면서 반도체식 가스센서(5)의 감지부에 산소가 흡착되어 감지부의 저항값이 상당히 증가한다.When the person to be measured blows the exhalation strongly into the exhalation passage 2, the exhalation flows into the exhalation passage 2, and a part of the exhalation flows into the sample gas chamber 3 and then passes through the sample gas discharge pipe 33. It is discharged to the outside. In this process, contaminants such as odor components remaining inside the sample gas chamber 3 are discharged to the outside of the sample gas chamber 3 with exhalation. In addition, as the contaminants attached to the surface of the sensing portion of the semiconductor gas sensor 5 are removed, oxygen is adsorbed to the sensing portion of the semiconductor gas sensor 5, and the resistance value of the sensing portion is significantly increased.
본 단계에서는 사용자의 날숨이 시료가스챔버(3)의 환기 및 반도체식 가스센서(5)의 감지부에 흡착된 오염 물질의 제거를 통한 반도체식 가스센서(5)의 빠른 안정화에 기여한다. 이러한 과정이 없이 감지부를 가열하는 방법만으로는 반도체식 가스센서(5)의 안정화에 너무 오랜 시간(1시간 이상)이 소요된다. 또한, 감지부에 장시간 가열하면, 감지부가 열화될 수도 있다. 또한, 휴대용 기기의 경우에는 배터리의 빠른 소모를 유발할 수 있다.In this step, the user's exhalation contributes to the rapid stabilization of the semiconductor gas sensor 5 through the ventilation of the sample gas chamber 3 and the removal of contaminants adsorbed on the sensing portion of the semiconductor gas sensor 5. Without this process, it takes too long (more than 1 hour) to stabilize the semiconductor gas sensor 5 by only heating the sensing unit. In addition, if the sensing unit is heated for a long time, the sensing unit may deteriorate. In addition, in the case of a portable device, it may cause rapid consumption of the battery.
날숨이 날숨 통로(2)에 유입된 후에 미리 정해진 시간(Ta)이 지나면 반도체식 가스센서(5)의 히터가 꺼진다. 미리 정해진 시간은 3 내지 7초 정도이다.After the exhalation flows into the exhalation passage 2, the heater of the semiconductor gas sensor 5 is turned off when a predetermined time Ta passes. The predetermined time is about 3 to 7 seconds.
다음, 히터에 다시 자동으로 측정단계 히터 전력(Pm)을 인가하여 측정 대기 단계에 돌입한다(S6).Subsequently, the heater power Pm is automatically applied to the heater again to enter the measurement standby stage (S6).
필요한 경우에는 측정단계 히터 전력(Pm)을 인가하기 이전에, 고온 워밍업 전력(Pw)을 8 내지 12초 인가할 수도 있다.If necessary, the high-temperature warm-up power Pw may be applied for 8 to 12 seconds before the measurement step heater power Pm is applied.
측정 대기 단계가 완료되면, 표시부(7)를 통해서 측정 준비가 되었음을 측정자에게 알린다. 측정자는 다시 피측정자가 불대(1)를 통해서 날숨 통로(2)에 날숨을 불어넣도록 한다.When the measurement waiting step is completed, the measurement unit is notified through the display unit 7 that the measurement is ready. The tester in turn causes the testee to breathe the exhalation passage 2 through the fire 1.
다음, 다시 시료가스가 유입되면 아세톤 농도가 측정된다(S7).Next, when the sample gas is introduced again, the acetone concentration is measured (S7).
측정 대기 단계에서 피측정자가 날숨을 날숨 통로(2)에 불어넣으면, 날숨의 일부인 시료가스가 시료가스챔버(3)에 유입되며, 날숨에 포함된 아세톤에 의해서 감지부의 저항값이 변화한다. 제어기(6)는 이러한 저항값의 변화에 따른 전기신호를 수신하여, 날숨에 포함되어 있는 아세톤 농도를 측정한다. 그리고 이를 근거로 혈중 아세톤 농도도 연산할 수 있다. 또한, 혈중 아세톤 농도를 근거로 체지방 연소량도 연산할 수 있다.When the person to be breathed in the exhalation passage 2 in the measurement waiting step, the sample gas that is part of the exhalation flows into the sample gas chamber 3, and the resistance value of the sensing unit is changed by the acetone included in the exhalation. The controller 6 receives the electric signal according to the change of the resistance value, and measures the acetone concentration included in the exhalation. And based on this, it is also possible to calculate the concentration of acetone in the blood. In addition, the amount of body fat burned can be calculated based on the concentration of acetone in the blood.
다음으로, 감지부가 안정한 상태인 것으로 판단된 경우에는 대해서 설명한다. 감지부가 안정한 상태일 경우에는 불안정한 상태인 경우와 달리 안정화 판단 단계(S4) 이후에 바로 아세톤 농도가 측정 단계(S7)가 진행된다. 즉, 안정화 판단 단계(S4)가 바로 측정 대기 단계로서의 역할도 하게 된다. 상술한 바와 같이, 안정화 판단 단계(S4)에서는 측정단계 히터 전력(Pm)이 인가되므로, 안정화 판단 단계(S4) 이후에 다시 측정 대기 단계를 거칠 필요가 없다.Next, a case where the sensing unit is judged to be in a stable state will be described. When the detector is in a stable state, unlike the unstable state, the acetone concentration is measured immediately (S7) immediately after the stabilization determination step (S4). That is, the stabilization determination step (S4) also serves as a measurement waiting step. As described above, since the measurement step heater power Pm is applied in the stabilization determination step S4, it is not necessary to go through the measurement standby step again after the stabilization determination step S4.
본 발명의 가스 농도 측정방법에서는 2 ~ 5분 정도면 측정이 완료될 수 있다.In the gas concentration measuring method of the present invention, measurement may be completed in about 2 to 5 minutes.
이상에서 설명된 실시예는 본 발명의 바람직한 실시예를 설명한 것에 불과하고, 본 발명의 권리범위는 설명된 실시예에 한정되는 것은 아니며, 본 발명의 기술적 사상과 특허청구범위 내에서 이 분야의 당업자에 의하여 다양한 변경, 변형 또는 치환이 가능할 것이며, 그와 같은 실시예들은 본 발명의 범위에 속하는 것으로 이해되어야 한다.The embodiments described above are merely illustrative of preferred embodiments of the present invention, and the scope of the present invention is not limited to the described embodiments, and those skilled in the art within the technical spirit and claims of the present invention. Various changes, modifications, or substitutions may be made by and it should be understood that such embodiments are within the scope of the present invention.
예를 들어, 최근 아세톤 농도 측정 후 경과 시간에 따라서 고온 워밍업 단계 또는 일반 워밍업 단계로 진행하는 것으로 설명하였으나, 용도에 따라서는 경과 시간을 판단하지 않고, 일반 워밍업 단계로 진행할 수도 있다. 물론, 경과 시간에 관계없이 고온 워밍업 단계로 진행할 수도 있다.For example, it has been described that the process proceeds to a high-temperature warm-up step or a general warm-up step depending on the elapsed time after the recent measurement of acetone concentration, but depending on the use, the elapsed time may not be determined, and the process may proceed to the general warm-up step. Of course, it is also possible to proceed to the high temperature warm-up step regardless of the elapsed time.
또한, 아세톤을 예로 들어서 설명하였으나, 알코올과 같은 다른 가스를 측정 대상 가스로 사용하는 경우에도 본 발명의 가스 농도 측정장치 및 가스 농도 측정방법이 사용될 수 있다.In addition, although acetone has been described as an example, the gas concentration measuring apparatus and gas concentration measuring method of the present invention can be used even when other gases such as alcohol are used as the gas to be measured.
[부호의 설명][Description of codes]
1: 불대1: Buddha
2: 날숨 통로2: exhalation passage
21: 채취구멍21: collection hole
23: 유입구23: inlet
24: 배출구24: outlet
3: 시료가스챔버3: Sample gas chamber
31: 시료가스유입관31: sample gas inlet pipe
33: 시료가스배출관33: sample gas discharge pipe
5: 반도체식 가스센서5: Semiconductor type gas sensor
6: 신호처리부6: Signal processing unit
7: 표시부7: Display
Claims (8)
- 날숨이 흐르는 날숨 통로와; 상기 날숨 통로와 연통되며, 상기 날숨 통로에 흐르는 날숨의 일부인 시료가스가 유입되는 시료가스챔버와; 상기 시료가스챔버의 내부에 배치되며, 측정 대상 가스의 농도에 따른 전기신호를 발생시키는 감지부와, 상기 감지부를 가열하는 히터를 포함하는 반도체식 가스센서와; 상기 히터를 제어하고, 상기 반도체식 가스센서로부터 전기신호를 수신하여, 측정 대상 가스의 농도를 연산하는 제어기를 포함하는 가스 농도 측정장치를 이용한 가스 농도 측정방법으로서,An exhalation passage through which exhalation flows; A sample gas chamber in communication with the exhalation passage, through which a sample gas which is a part of the exhalation flowing in the exhalation passage is introduced; A semiconductor gas sensor disposed inside the sample gas chamber and including a sensing unit for generating an electric signal according to the concentration of the gas to be measured and a heater for heating the sensing unit; A gas concentration measuring method using a gas concentration measuring apparatus comprising a controller for controlling the heater, receiving an electric signal from the semiconductor gas sensor, and calculating a concentration of the gas to be measured,a) 상기 히터에 전력을 인가하여 상기 감지부를 가열하는 워밍업 단계와,a) a warm-up step of applying the electric power to the heater to heat the sensing unit,b) 상기 히터에 측정단계 히터 전력(Pm)이 인가된 상태에서 상기 감지부의 저항값을 측정하는 안정화 판단 단계와,b) a stabilization determination step of measuring the resistance value of the sensing unit in a state in which the heater power Pm is applied to the heater;c) 상기 날숨 통로에 날숨이 유입되는 단계와,c) the step of exhalation is introduced into the exhalation passage,d) 상기 히터에 측정단계 히터 전력(Pm)을 인가하는 측정 대기 단계와,d) a measurement standby step of applying a heater power (Pm) of the measurement step to the heater,e) 상기 날숨 통로에 날숨이 유입되면, 상기 반도체식 가스센서로부터 전기신호를 수신하여 측정 대상 가스의 농도를 연산하는 단계를 포함하며,e) when the exhalation flows into the exhalation passage, receiving an electrical signal from the semiconductor gas sensor and calculating the concentration of the gas to be measured,상기 b) 단계에서 상기 감지부가 안정한 것으로 판단되면, 상기 b) 단계 후 상기 e) 단계가 진행되고,If it is determined in step b) that the sensing unit is stable, step b) is followed by step e),상기 b) 단계에서 상기 감지부가 불안정한 것으로 판단되면, 상기 b) 단계 후 상기 c), d) 및 e) 단계가 순차적으로 진행되는 가스 농도 측정방법.If it is determined in step b) that the sensing unit is unstable, the gas concentration measurement method in which steps c), d) and e) are sequentially performed after step b).
- 제1항에 있어서,According to claim 1,상기 a) 단계는 상기 히터에 측정단계 히터 전력(Pm)보다 10 내지 50% 큰 가속 워밍업 전력(Pw)을 인가하는 고온 워밍업 단계를 포함하는 가스 농도 측정방법.The a) step is a gas concentration measurement method comprising a high-temperature warm-up step of applying an accelerated warm-up power (Pw) 10 to 50% greater than the heater power (Pm) of the measurement step.
- 제1항에 있어서,According to claim 1,상기 a) 단계는 상기 히터에 측정단계 히터 전력(Pm)을 인가하는 일반 워밍업 단계를 포함하는 가스 농도 측정방법.The a) step is a gas concentration measuring method comprising a general warm-up step of applying a heater power (Pm) of the measuring step to the heater.
- 제1항에 있어서,According to claim 1,상기 d) 단계 직전에 상기 히터에 고온 워밍업 전력(Pw)을 인가하는 단계를 더 포함하는 가스 농도 측정방법.Gas concentration measurement method further comprising the step of applying a high temperature warm-up power (Pw) to the heater immediately before the step d).
- 제1항에 있어서,According to claim 1,상기 d) 단계 직전에 상기 히터에 고온 워밍업 전력(Pw)을 8 내지 12초 인가하는 단계를 더 포함하는 가스 농도 측정방법.The step d) immediately before the step of applying a high-temperature warm-up power (Pw) for 8 to 12 seconds to the gas concentration measurement method further comprises.
- 제1항에 있어서,According to claim 1,상기 c) 단계는 상기 날숨 통로에 날숨이 유입되면, 미리 정해진 시간(Ta)이 지난 후 상기 히터를 끄는 단계를 포함하는 가스 농도 측정방법.The step c), when the exhalation flows into the exhalation passage, the gas concentration measurement method comprising the step of turning off the heater after a predetermined time (Ta).
- 제6항에 있어서,The method of claim 6,상기 c) 단계가 종료되면 자동으로 상기 d) 단계로 진입하는 가스 농도 측정방법.When the step c) ends, the gas concentration measurement method that automatically enters the step d).
- 날숨이 흐르는 날숨 통로와; 상기 날숨 통로와 연통되며, 상기 날숨 통로에 흐르는 날숨의 일부인 시료가스가 유입되는 시료가스챔버와; 상기 시료가스챔버의 내부에 배치되며, 측정 대상 가스의 농도에 따른 전기신호를 발생시키는 감지부와, 상기 감지부를 가열하는 히터를 포함하는 반도체식 가스센서와; 상기 히터를 제어하고, 상기 반도체식 가스센서로부터 전기신호를 수신하여, 측정 대상 가스의 농도를 연산하는 제어기를 포함하는 가스 농도 측정장치에 있어서,An exhalation passage through which exhalation flows; A sample gas chamber in communication with the exhalation passage, through which a sample gas which is a part of the exhalation flowing in the exhalation passage is introduced; A semiconductor gas sensor disposed inside the sample gas chamber and including a sensing unit for generating an electric signal according to the concentration of the gas to be measured and a heater for heating the sensing unit; In the gas concentration measuring apparatus comprising a controller for controlling the heater, and receiving an electrical signal from the semiconductor gas sensor, to calculate the concentration of the gas to be measured,상기 제어기는,The controller,ㄱ) 상기 히터에 전력을 인가하여 상기 감지부를 가열하는 워밍업 단계와,A) a warm-up step of heating the sensing unit by applying electric power to the heater,ㄴ) 상기 히터에 측정단계 히터 전력(Pm)이 인가된 상태에서 상기 감지부의 저항값을 측정하는 안정화 판단 단계와,B) a stabilization determination step of measuring the resistance value of the sensing unit in a state in which the heater power Pm is applied to the heater;ㄷ) 상기 날숨 통로에 날숨이 유입된 후 상기 히터에 측정단계 히터 전력(Pm)을 인가하는 측정 대기 단계와,C) After the exhalation flows into the exhalation passage, the measurement standby step of applying the heater power Pm to the heater.ㄹ) 상기 날숨 통로에 날숨이 유입되면, 상기 반도체식 가스센서로부터 전기신호를 수신하여 측정 대상 가스의 농도를 연산하는 단계를 수행하도록 구성되며,D) when the exhalation flows into the exhalation passage, it is configured to perform the step of receiving the electrical signal from the semiconductor gas sensor and calculating the concentration of the gas to be measured,상기 제어기는,The controller,상기 ㄴ) 단계에서 상기 감지부가 안정한 것으로 판단되면, 상기 ㄴ) 단계 후 상기 ㄹ) 단계를 수행하고,If it is determined in step b) that the sensor is stable, after step b), step d) is performed,상기 ㄴ) 단계에서 상기 감지부가 불안정한 것으로 판단되면, 상기 ㄴ) 단계 후 상기 ㄷ) 및 ㄹ) 단계를 순차적으로 수행하도록 구성된 가스 농도 측정장치.If it is determined in step b) that the sensing unit is unstable, a gas concentration measuring device configured to sequentially perform steps c) and d) after step b).
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KR100549119B1 (en) * | 2004-08-17 | 2006-02-02 | (주)센텍코리아 | An apparatus for measuring density of alcohol using semiconductor sensor |
JP2009244236A (en) * | 2008-04-01 | 2009-10-22 | Hanshin Electric Co Ltd | Smell detecting device |
KR20110043838A (en) * | 2009-10-22 | 2011-04-28 | 주식회사 과학기술분석센타 | Method for measuring concentriation of gas and device for the same |
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