WO2022114158A1 - 空気質判定システム、空気質判定方法、及びセンサモジュール - Google Patents
空気質判定システム、空気質判定方法、及びセンサモジュール Download PDFInfo
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- WO2022114158A1 WO2022114158A1 PCT/JP2021/043503 JP2021043503W WO2022114158A1 WO 2022114158 A1 WO2022114158 A1 WO 2022114158A1 JP 2021043503 W JP2021043503 W JP 2021043503W WO 2022114158 A1 WO2022114158 A1 WO 2022114158A1
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Definitions
- This disclosure relates to an air quality determination system, an air quality determination method, and a sensor module. More specifically, the present disclosure relates to an air quality determination system for determining the state of air quality of a sample gas, an air quality determination method, and a sensor module.
- Patent Document 1 discloses a gas detection device including a semiconductor type gas detection element, an energization heating control unit, and a calculation unit.
- the energization heating control unit alternately repeats a first energization state in which a voltage is applied to the gas detection element to purge and heat it, and a second energization state in which the gas detection element is maintained in an adsorption state in which atmospheric gas is adsorbed.
- the calculation unit obtains the difference between the first output of the gas detection element immediately after switching from the first energization state to the second energization state and the second output of the gas detection element at the end of the second energization state. The alarm is judged based on this difference.
- the second output in the second energized state which is lower than the first energized state, has a fluctuation amount due to the environmental temperature. May be included. In that case, the difference between the first output and the second output may fluctuate depending on the environmental temperature, and there is a possibility that the air quality state of the sample gas is erroneously determined.
- An object of the present disclosure is to provide an air quality determination system, an air quality determination method, and a sensor module capable of suppressing deterioration of the determination accuracy of the air quality state.
- the air quality determination method of one aspect of the present disclosure is an air quality determination method using a sensitive portion whose electrical characteristic value changes in response to one or a plurality of types of molecules.
- the air quality determination method includes a temperature control step, an acquisition step, a determination step, and an output step.
- the temperature control step the temperature of the sensitive portion exposed to the sample gas is set to at least a temperature rising period in which the temperature of the sensitive portion rises and a temperature lowering period in which the temperature of the sensitive portion falls in a predetermined measurement period. It is controlled so as to change according to the temperature change pattern including once.
- the acquisition step the electrical characteristic value of the sensitive portion exposed to the sample gas is acquired.
- the determination step a learned model for determining the air quality state of the sample gas is used, and the air quality state of the sample gas is determined based on the change in the electrical characteristic value.
- the output step the determination result of the determination step is output.
- the air quality determination method of one aspect of the present disclosure is an air quality determination method using a sensitive portion whose electrical characteristic value changes in response to one or a plurality of types of molecules.
- the air quality determination method includes a temperature control step, an acquisition step, a determination step, and an output step.
- the sensitive unit includes a plurality of sensitive modules.
- the temperature control step the temperature of the plurality of sensitive modules exposed to the sample gas is measured in each of the plurality of sensitive modules during a temperature rise period in which the temperature rises and a temperature drop period in which the temperature drops in each of the plurality of sensitive modules. It is controlled so as to change in a temperature change pattern including at least once.
- the acquisition step the electrical characteristic values of each of the plurality of sensitive modules exposed to the sample gas are acquired.
- the determination step a trained model for determining the air quality state of the sample gas is used, and the air quality of the sample gas is based on the change in the electrical characteristic value of each of the plurality of sensitive modules. Judgment of the state of.
- the determination result of the determination step is output.
- the air quality determination system of one aspect of the present disclosure includes a sensitive unit, an exposure unit, a temperature control element, a control unit, an acquisition unit, a determination unit, and an output unit.
- the sensitive portion changes its electrical property value in response to one or a plurality of types of molecules.
- the exposed portion exposes the sensitive portion to the sample gas during a predetermined measurement period.
- the temperature control element performs at least one of heating and cooling of the sensitive portion.
- the control unit has at least a temperature rise period in which the temperature of the sensitive unit exposed to the sample gas rises and a temperature decrease period in which the temperature of the sensitive unit decreases.
- the temperature control element is controlled so as to change according to the temperature change pattern included once.
- the acquisition unit acquires the electrical characteristic value of the sensitive unit during the predetermined measurement period.
- the determination unit uses a trained model for determining the air quality state of the sample gas, and determines the air quality state of the sample gas based on the change in the electrical characteristic value.
- the output unit outputs the determination result of the determination unit.
- the air quality determination system of one aspect of the present disclosure includes a plurality of sensitive modules, an exposure unit, a temperature control element, a control unit, an acquisition unit, a determination unit, and an output unit.
- the plurality of sensitive modules change their electrical property values in response to one or a plurality of types of molecules.
- the exposed portion exposes the plurality of sensitive modules to the sample gas during a predetermined measurement period.
- the temperature control element performs at least one of heating and cooling of the plurality of sensitive modules.
- the control unit includes at least one temperature rise period in which the temperature of each of the plurality of sensitive modules exposed to the sample gas rises and a temperature fall period in which the temperature falls.
- the temperature control element is controlled so as to change according to the temperature change pattern.
- the acquisition unit acquires the electrical characteristic values of the plurality of sensitive modules in the predetermined measurement period.
- the determination unit uses a trained model for determining the air quality state of the sample gas, and the air quality state of the sample gas is based on changes in the electrical characteristic values of the plurality of sensitive modules. Judgment is made.
- the output unit outputs the determination result of the determination unit.
- the sensor module of one aspect of the present disclosure includes a sensitive unit and a temperature control element.
- the sensitive portion changes its electrical property value in response to one or a plurality of types of molecules.
- the temperature control element performs at least one of heating and cooling of the sensitive portion.
- the temperature of the sensitive portion exposed to the sample gas has at least a temperature rise period in which the temperature of the sensitive portion rises and a temperature decrease period in which the temperature of the sensitive portion falls in a predetermined measurement period.
- the temperature of the sensitive portion is changed so as to change according to the temperature change pattern included once.
- FIG. 1 is a schematic system configuration diagram of an air quality determination system according to an embodiment of the present disclosure.
- FIG. 2 is a schematic explanatory view of a sensitive portion included in the same air quality determination system.
- FIG. 3 is a schematic explanatory view showing the states before and after the above-mentioned sensitive portion absorbs the molecule to be detected, respectively.
- FIG. 4 is a waveform diagram showing the current flowing through the temperature control element included in the same air quality determination system, the temperature of the storage space, the output of the negative characteristic sensitive element, and the output of the positive characteristic sensitive element.
- FIG. 5 is a graph showing the measurement results of resistance value changes in response to temperature changes for the 16 sensitive elements included in the same air quality determination system.
- FIG. 6 is an explanatory diagram illustrating a process of outputting output data from a plurality of sensitive elements included in the same air quality determination system.
- FIG. 7 is an explanatory diagram showing output data of the sensitive unit when the temperature of the sensitive unit of the air quality determination system is changed in the temperature range of 25 ° C. or higher and 50 ° C. or lower.
- FIG. 8 is an explanatory diagram showing output data of the sensitive unit when the temperature of the sensitive unit of the air quality determination system is changed in the temperature range of 0 ° C. or higher and 25 ° C. or lower.
- FIG. 9 is an explanatory diagram showing output data of the sensitive unit when the temperature of the sensitive unit of the air quality determination system is changed in the temperature range of ⁇ 20 ° C. or higher and 5 ° C.
- FIG. 10 is a flowchart illustrating the operation of the inference phase of the same air quality determination system.
- FIG. 11 is an explanatory diagram showing difference data when the temperature of the sensitive portion of the air quality determination system of Modification 1 is changed in a temperature range of 25 ° C. or higher and 50 ° C. or lower.
- FIG. 12 is an explanatory diagram showing difference data when the temperature of the sensitive portion of the air quality determination system of Modification 1 is changed in a temperature range of 0 ° C. or higher and 25 ° C. or lower.
- FIG. 13 is an explanatory diagram showing difference data when the temperature of the sensitive portion of the air quality determination system of Modification 1 is changed in a temperature range of ⁇ 20 ° C. or higher and 5 ° C. or lower.
- FIG. 14 is a schematic plan view of a plurality of sensitive modules included in the air quality determination system of Modification 2.
- FIG. 15 is a graph showing changes in temperature of a plurality of sensitive modules included in the air quality determination system of Modification 2 over time.
- FIG. 16 is a schematic plan view of a plurality of sensitive modules included in the air quality determination system of Modification 2.
- FIG. 17 is a side view of a sensitive portion included in the air quality determination system of the modified example 2.
- FIG. 18 is a schematic plan view of a plurality of sensitive modules included in the air quality determination system of Modification 2.
- FIG. 19 is a schematic exploded perspective view of a sensor module included in the air quality determination system of one embodiment.
- each component in the composition means the total amount of the plurality of substances present in the composition when a plurality of substances corresponding to each component in the composition are present, unless otherwise specified. ..
- FIG. 1 is a schematic system configuration diagram of the air quality determination system 1 according to the present embodiment.
- the air quality determination system 1 is used, for example, to detect an odor molecule as a molecule to be detected.
- the odor molecule to be detected may contain, for example, volatile organic compounds (VOC: Volatile Organic Compounds) such as Benzaldehyde, Nonanal, and Pyrrol contained in human body odor components, ammonia, and the like.
- VOC volatile organic compounds
- the air quality determination system 1 detects VOCs, which are odor molecules contained in, for example, a gas containing body odor or exhaled air collected from the body of a subject, or a sample gas such as air collected from a room in a building.
- VOCs are odor molecules contained in, for example, a gas containing body odor or exhaled air collected from the body of a subject, or a sample gas such as air collected from a room in a building.
- the molecule to be detected by the air quality determination system 1 is not limited to VOCs, and may be a plurality of types of odor molecules including VOCs.
- the air quality determination system 1 can be used for determining the health condition of a subject by determining the air quality condition of the sample gas by using a gas containing body odor or exhaled breath collected from the subject's body as a sample gas. be.
- the air quality determination system 1 determines the state of the air quality of the sample gas, thereby determining the degree of fatigue or arousal of the driver. It may be used for the purpose of determining. Further, the air quality determination system 1 may perform biometric authentication by determining the state of the air quality of the sample gas collected from the subject, or a rescuer who is underlaying debris or the like at a disaster site or the like.
- the sample gas is not limited to the gas emitted from the human body (exhaled breath, etc.), and the air quality determination system 1 manages the quality of food by detecting the presence or absence of the gas emitted when the food or the like rots. good. Further, the air quality determination system 1 may determine the state of the air quality in the room by detecting the presence or absence of VOCs emitted from the building materials of the room or the like. Further, the air quality determination system 1 may determine the presence or absence of a gas generated by a fire, a gas released from an explosive or a drug, or a toxic gas.
- the air quality determination system 1 includes a sensitive unit 2, an exposed unit (sensor storage chamber 10), a temperature control element 3, and a determination module 5.
- the determination module 5 includes at least a temperature control unit 51 and a determination unit 55. That is, the air quality determination system 1 includes a sensitive unit 2, an exposed unit (sensor storage chamber 10), a temperature control element 3, a temperature control unit 51, and a determination unit 55.
- the sensitive portion 2 has the organic composition 21 and the conductive particles 22 dispersed in the organic composition 21, and has electrical properties in response to one or a plurality of types of molecules having sensitivity. The value changes.
- the exposed part (sensor storage chamber 10) exposes the sensitive part 2 to the sample gas during a predetermined measurement period.
- the temperature control element 3 performs at least one of heating and cooling of the sensitive unit 2.
- the temperature control unit 51 controls the temperature of the sensitive unit 2 by controlling the temperature control element 3.
- the temperature control unit 51 controls the temperature control element 3 so that the temperature of the sensitive unit 2 exposed to the sample gas changes in a temperature change pattern including a temperature rise period and a temperature decrease period at least once.
- the temperature rise period is a period in which the temperature of the sensitive unit 2 rises
- the temperature decrease period is a period in which the temperature of the sensitive unit 2 decreases.
- the determination unit 55 determines the state of the air quality of the sample gas.
- the determination unit 55 determines the air quality state of the sample gas based on the change pattern of the electrical characteristic value in the state where the temperature of the sensitive unit 2 exposed to the sample gas is changed by the above temperature change pattern. ..
- the electrical characteristic value of the sensitive unit 2 is, for example, an electrical resistance, or a current value or a voltage value corresponding to the electrical resistance.
- Determining the air quality state of the sample gas means whether or not the molecule to be detected exists in the sample gas, in other words, whether or not the molecule to be detected exceeds a predetermined concentration in the sample gas. It may be determined, or the type of the molecule to be detected existing in the sample gas may be determined. Further, the molecule to be detected is not limited to one type. When there are a plurality of types of molecules to be detected, determining the state of air quality may determine the presence or absence and concentration of molecules for each type. Further, the determination of the air quality state may be made by determining the odor quality of the sample gas (for example, good odor, bad odor, etc.).
- the temperature control unit 51 controls the temperature control element 3 to change the temperature of the sensitive unit 2 exposed to the sample gas to a temperature including a temperature raising period and a temperature lowering period. Change with a change pattern. Then, the determination unit 55 determines the sample gas based on the change pattern of the electrical characteristic value in the state where the temperature of the sensitive unit 2 exposed to the sample gas is changed by the temperature change pattern including the temperature rise period and the temperature decrease period. Judge the state of air quality.
- the electrical characteristic value of the sensitive portion 2 changes in response to the molecule having sensitivity in the sensitive portion 2
- the change pattern of the electrical characteristic value in the temperature raising period and the temperature decreasing period has the sensitivity of the sensitive portion 2.
- the determination unit 55 can determine the state of the air quality of the sample gas based on the fluctuation of the change pattern of the electrical characteristic value in the temperature raising period and the temperature lowering period, and makes an erroneous determination due to the fluctuation due to the temperature. It can be suppressed, and deterioration of the determination accuracy of the air quality state can be suppressed.
- the air quality determination system 1 of the present embodiment includes the above-mentioned sensitive unit 2, the temperature control element 3, and the determination module 5.
- the determination module 5 includes a temperature control unit 51 and a processing unit 50 including the determination unit 55. Further, the air quality determination system 1 further includes a temperature sensor 4 and a sensor storage chamber 10, and the determination module 5 further includes a storage unit 52 and a display unit 57.
- the sensitive unit 2, the temperature control element 3, and the temperature sensor 4 are housed in the storage space 11 inside the sensor storage chamber 10.
- the sensor storage chamber 10 is provided with an introduction port 12 for introducing air into the storage space 11 and an exhaust port 13 for discharging air from the storage space 11 to the outside.
- the sample gas is introduced into the storage space 11 from the introduction port 12 and discharged to the outside through the exhaust port 13.
- an exposed portion that exposes the sensitive portion 2 to the sample gas during a predetermined measurement period is realized.
- the sensitive part 2 stored in the storage space 11 is exposed to the sample gas.
- the air quality determination system 1 has a storage space 11 as an exposed portion that exposes the sensitive portion 2 to the sample gas during a predetermined measurement period.
- the air quality determination system 1 may be provided with a ventilation device or the like for feeding the sample gas into the storage space 11.
- a plate-shaped electric heating element 31 is arranged as a temperature control element 3 inside the storage space 11, and a sensitive portion 2 is arranged on the electric heating element 31. Further, inside the storage space 11, a temperature sensor 4 such as a thermistor is arranged in the vicinity of the sensitive portion 2.
- the temperature sensor 4 is a sensor for detecting the temperature of the sensitive portion 2, and in the present embodiment, the temperature of the sensitive portion 2 is indirectly measured by detecting the temperature around the sensitive portion 2 (the temperature of the storage space). Is detected.
- the sensitive unit 2 changes its electrical characteristic value in response to one or a plurality of types of molecules having sensitivity.
- the sensitive unit 2 has a plurality of sensitive elements Ax (x is a natural number) having different sensitive characteristics from each other.
- the sensitive unit 2 has 16 sensitive elements Ax, and in the following, each of the 16 sensitive elements Ax may be referred to as a sensitive element A1 to A16 (see FIG. 2).
- the 16 sensitive elements A1 to A16 are arranged side by side in 4 rows and 4 columns on the flat plate-shaped substrate 20.
- each of the sensitive elements Ax has an organic composition 21 obtained by molding an organic material into a disk shape and conductive particles 22 dispersed in the organic composition 21. It has and is formed in the form of a film.
- the organic composition 21 absorbs the molecule to be detected and expands.
- the figure on the left side shows the state before the sensitive element Ax absorbs the molecule M1 to be detected
- the figure on the right side shows the state after the sensitive element Ax absorbs the molecule M1 to be detected.
- the organic composition 21 expands when the sensitive element Ax absorbs the molecule M1 to be detected, after the sensitive element Ax absorbs the molecule M1 to be detected, it is more conductive than before the molecule M1 to be detected is absorbed. The distance between the particles 22 becomes widened, and the electric resistance of the sensitive element Ax increases.
- the molecule to be detected is an odor molecule such as benzaldehyde, nonanal, or pyrrole. That is, the sensitive element Ax has an organic composition 21 having sensitivity to odor molecules, and when the sensitive portion 2 is exposed to a sample gas containing odor molecules, the organic composition 21 adsorbs odor molecules. This causes expansion and increases the electrical resistance of the organic composition 21.
- the sensitive element Ax has a temperature dependence in which the electrical characteristic value (electrical resistance) changes according to the temperature.
- the sensitive element Ax includes a sensitive element (hereinafter, also referred to as a positive characteristic sensitive element) Ax having a positive resistance coefficient in which the electric resistance increases as the temperature rises, and the electric resistance decreases as the temperature rises.
- a sensitive element hereinafter, also referred to as a negative characteristic sensitive element
- Ax having a negative resistance coefficient.
- the sensitive unit 2 includes a negative characteristic sensitive element having a negative resistance coefficient in a temperature region of ⁇ 20 ° C. or higher and 50 ° C. or lower, and the sensitive elements A1 to A11 correspond to the negative characteristic sensitive element. .. Further, the sensitive unit 2 includes a positive characteristic sensitive element having a positive resistance coefficient in a temperature region of ⁇ 20 ° C. or higher and 50 ° C. or lower, and the sensitive elements A12 to A16 correspond to the positive characteristic sensitive element. As shown in FIG. 4, the temperature control unit 51 controls the temperature of the sensitive unit 2 by passing a current I1 through the thermoelectric element 31 in a pulsed manner.
- the temperature of the sensitive unit 2 is controlled.
- the temperature T11 of the storage space 11 also has a temperature change pattern in which the temperature rising period UT1 in which the temperature rises and the temperature falling period DT1 in which the temperature falls alternately repeat. Change.
- the length of the temperature rising period UT1 is a time required for desorption of odor molecules, for example, several tens of seconds, but this time can be changed as appropriate.
- the length of the temperature lowering period DT1 is the time required for the fluctuation of the electrical characteristic value to stabilize due to the adsorption of the odor molecule, for example, several tens of seconds, but this time can be changed as appropriate.
- the sensitive element A1 is a negative characteristic sensitive element whose resistance value decreases as the temperature rises. Therefore, when the temperature of the sensitive element A1 is changed by the above temperature change pattern, the change pattern of the resistance value RA1 of the sensitive element A1 is such that the resistance value RA1 decreases as the temperature rises in the temperature rise period UT1 and the temperature drops. In the period DT1, the change pattern is such that the resistance value RA1 increases as the temperature decreases.
- the sensitive element A1 is exposed to a sample gas containing an odor molecule, the resistance value RA1 decreases due to the desorption of the odor molecule during the temperature rise period UT1, and the resistance value RA1 due to the absorption of the odor molecule during the temperature decrease period DT1.
- the change pattern of the resistance value RA1 of the sensitive element A1 is a change pattern in which the fluctuation amount according to the amount of odor molecules adsorbed by the sensitive element A1 is superimposed on the fluctuation amount due to the temperature change.
- the resistance value RA1 when the sensitive element A1 is exposed to a standard gas containing no odor molecule (for example, nitrogen gas) is shown by a solid line, and the sensitive element A1 is exposed to the sample gas containing an odor molecule.
- the resistance value RA1 at that time is shown by a dotted line.
- the sensitive element A16 is a positive characteristic sensitive element whose resistance value increases as the temperature rises. Therefore, when the temperature of the sensitive element A16 is changed by the above temperature change pattern, the change pattern of the resistance value RA16 of the sensitive element A16 is such that the resistance value RA16 increases as the temperature rises in the temperature rise period UT1 and the temperature drops. In the period DT1, the change pattern is such that the resistance value RA16 decreases as the temperature decreases.
- the sensitive element A16 is exposed to a sample gas containing an odor molecule, the resistance value RA16 decreases due to the desorption of the odor molecule during the temperature rise period UT1, and the resistance value RA16 due to the absorption of the odor molecule during the temperature decrease period DT1.
- the change pattern of the resistance value RA16 of the sensitive element A16 is the fluctuation amount according to the amount of odor molecules adsorbed by the sensitive element A1 in the fluctuation amount due to the temperature change (increase in the temperature rise period UT1 and decrease in the temperature decrease period DT1). Is a superimposed change pattern.
- the resistance value RA16 when the sensitive element A16 is exposed to a standard gas (for example, nitrogen gas) is shown by a solid line
- the resistance value RA16 when the sensitive element A16 is exposed to a sample gas containing an odor molecule Is shown by a dotted line.
- the temperature control element 3 is an electric heating element 31 that heats the sensitive unit 2, and the temperature control unit 51 controls the temperature control element 3 to change the temperature of the sensitive unit 2 to the first temperature, which is the ambient temperature. And a second temperature higher than the ambient temperature.
- the second temperature is set to, for example, about 7 ° C. to 35 ° C. higher than the first temperature.
- the difference between the first temperature and the second temperature is the temperature difference at which adsorption and desorption of odor molecules occur, and the temperature difference is such that the resistance value change generated due to the temperature change becomes as small as possible. It is preferable to have it.
- the difference between the first temperature and the second temperature may be at least 7 ° C. or higher, and may be 35 ° C. or lower.
- the difference between the first temperature and the second temperature is preferably 20 ° C. or higher and 35 ° C. or lower, and more preferably 20 ° C. or higher and 25 ° C. or lower.
- the temperature control unit 51 controls the temperature of the sensitive unit 2 between the first temperature of 25 ° C. and the second temperature of 50 ° C.
- the temperature control unit 51 controls the temperature of the sensitive unit 2 between 0 ° C., which is the first temperature, and 25 ° C., which is the second temperature.
- the temperature control unit 51 controls the temperature of the sensitive unit 2 between ⁇ 20 ° C., which is the first temperature, and 5 ° C., which is the second temperature.
- the temperature change pattern in which the temperature control unit 51 changes the temperature of the sensitive unit 2 is not limited to the above temperature change pattern, and the temperature control unit 51 outputs the sensitive unit 2 according to the state of the air quality of the sample gas.
- the temperature of the sensitive portion 2 may be changed by a temperature change pattern such that the change pattern of the change pattern becomes larger.
- Table 1 below shows the compositions of the 16 sensitive elements A1 to A16.
- the% display of the side chain described in the column of side chain characteristics indicates the ratio to the entire side chain.
- the organic composition 21 contained in the sensitive elements A1 to A11 which are negative characteristic sensitive elements, has a siloxane in the main chain and a methyl group in the side chain.
- the organic composition 21 possessed by the sensitive elements A1 to A11 has a structure in which the structure represented by the following chemical formula 1 and the structure represented by the following chemical formula 2 are linked so that Si and O are alternately arranged. Have. In Chemical Formula 1 and Chemical Formula 2, any one of the plurality of R1s contains a methyl group.
- the positive characteristic sensitive element includes at least one of the first to fourth sensitive elements.
- the sensitive element A12 which is the first sensitive element, has a siloxane in the main chain, does not contain a methyl group in the side chain, and has a polyethylene glycol group in the side chain (specifically, a methoxypolyethylene glycol propyl group and a methoxypolyethylene glycol propyl group in the side chain). It has an organic composition 21 having a phenyl group).
- the sensitive element A12 has a structure represented by the following chemical formula 3. In Chemical Formula 3, m is, for example, 2 to 1000, and n is, for example, 2 to 1000.
- the sensitive element A13 which is the second sensitive element, has an organic composition 21 having a terephthalic acid-modified PEG in the main chain, no methyl group in the side chain, and a nitro group in the side chain.
- the sensitive element A13 has a structure represented by the following chemical formula 4. In the chemical formula 4, m is, for example, 2 to 1000, and n is, for example, 2 to 1000.
- the sensitive elements A14 and A15 which are the third sensitive elements, have an organic composition 21 having a siloxane in the main chain, no methyl group in the side chain, and a cyanopropyl group in the side chain.
- the sensitive element A14 has a structure represented by the following chemical formula 5, and the organic composition 21 of the sensitive element A14 has 90% cyanopropyl group and 10% phenyl group in the side chain.
- the sensitive element A15 has a structure represented by the following chemical formula 6, and 100% of the side chain of the organic composition 21 of the sensitive element A15 is a cyanopropyl group.
- the sensitive element A16 which is the fourth sensitive element, comprises an organic composition 21 having a siloxane in the main chain, no methyl group in the side chain, and a cyanoallyl group (specifically, a dicyanoallyl group) in the side chain.
- a cyanoallyl group specifically, a dicyanoallyl group
- the sensitive element A16 has a structure represented by the following chemical formula 7.
- FIG. 5 shows an example of the results of measuring the resistance values of the sensitive elements A1 to A16 in a state where the 16 sensitive elements A1 to A16 are exposed to a standard gas (for example, nitrogen gas).
- a standard gas for example, nitrogen gas.
- the resistance values at ⁇ 20 ° C., ⁇ 10 ° C., 0 ° C., 10 ° C., 30 ° C., 40 ° C., and 50 ° C. are measured as percentages based on the resistance values at 20 ° C. it's shown. From this measurement result, it can be seen that the sensitive elements A14 to A16 are sensitive elements having little change in resistance value according to the temperature change in the temperature range of 20 ° C to 50 ° C.
- the determination of the air quality state can be made accurately based on the change pattern of the resistance values of the sensitive elements A14 to A16. It will be possible to do.
- the sensitive unit 2 includes the first to fourth sensitive elements A12 to A16 as positive characteristic sensitive elements, but includes all the first to fourth sensitive elements A12 to A16. Is not essential, and may include one or more of the first to fourth sensitive elements A12 to A16.
- the temperature control unit 51 receives a control signal from the processing unit 50 and controls the temperature of the sensitive unit 2 by controlling the temperature control element 3 which is an electric heating element 31 such as a heater.
- the temperature control unit 51 acquires the environmental temperature based on the detection result of the temperature sensor 4 before starting the heating by the temperature control element 3, and sets the acquired environmental temperature as the first temperature. Further, the temperature control unit 51 sets a temperature higher than the first temperature by a predetermined temperature (for example, 25 ° C.) as the second temperature. Then, based on the detection result of the temperature sensor 4, the temperature control unit 51 has a temperature rise period UT1 in which the temperature of the sensitive unit 2 exposed to the sample gas rises to the second temperature, and a temperature drop to the first temperature.
- a predetermined temperature for example, 25 ° C.
- the temperature control element 3 is controlled so as to change in a temperature change pattern including the period DT1 at least once.
- the temperature control unit 51 repeats the temperature change pattern including the temperature rise period UT1 and the temperature decrease period DT1 once in response to the control signal from the processing unit 50, thereby raising the temperature of the sensitive unit 2. And lowering the temperature repeatedly.
- the sensitive portion 2 is exposed to the sample gas containing the molecule M1 having the sensitivity, when the temperature of the sensitive portion 2 rises during the temperature rise period UT1, it is absorbed by the organic composition 21.
- the desorption of the existing molecule M1 lowers the electrical resistance, which is the electrical characteristic value of the sensitive portion 2.
- the organic composition 21 adsorbs the molecule M1 and the resistance value, which is the electrical characteristic value of the sensitive portion 2, increases.
- the storage unit 52 includes one or more storage devices.
- the storage device is, for example, RAM, ROM, EEPROM, or the like.
- the storage unit 52 stores the learned model MD1 and the like used for determining the air quality state of the sample gas.
- the trained model MD1 has the output of the sensitive unit 2 when the first condition regarding the gas to which the sensitive unit 2 is exposed and the second condition regarding the temperature change pattern for raising and lowering the temperature of the sensitive unit 2 are changed. This is a trained model in which the relationship between the change pattern of the output of the sensitive unit 2 and the air quality state of the sample gas is learned using the change pattern as learning data.
- the trained model MD1 may be generated by the air quality determination system 1, but may be generated by a learning system other than the air quality determination system 1.
- the display unit 57 includes, for example, a display device such as a liquid crystal display.
- the display unit 57 displays the determination result input from the processing unit 50.
- the display unit 57 displays the presence / absence of odor molecules in the sample gas, the amount of odor molecules when odor molecules are present, the quality of odor, and the like.
- the processing unit 50 is a control circuit that controls the operation of the air quality determination system 1.
- the processing unit 50 can be realized by, for example, a computer system including one or more processors (microprocessors) and one or more memories. That is, one or more processors execute one or more programs (applications) stored in one or more memories, thereby functioning as the processing unit 50.
- the program is recorded in advance in the memory of the processing unit 50 or the storage unit 52 here, the program may be provided by being recorded in a telecommunication line such as the Internet or recorded in a non-temporary recording medium such as a memory card. ..
- the processing unit 50 has an acquisition unit 53, a learning unit 54, a determination unit 55, and an output unit 56.
- the acquisition unit 53, the learning unit 54, the determination unit 55, and the output unit 56 do not show a substantive configuration, but show functions realized by the processing unit 50.
- the acquisition unit 53 includes data on the temperature change pattern of the sensitive unit 2 detected by the temperature sensor 4 in a state where the temperature control unit 51 applies a current to the temperature control element 3 in a pulsed manner, and the temperature rise period UT1 and the temperature decrease period.
- the pulse outputs PL1 to PL16 (see FIG. 6) of the sensitive elements A1 to A16 for one cycle including the DT1 once are acquired.
- a constant DC voltage is applied to each of the sensitive elements A1 to A16, and the acquisition unit 53 acquires the change in the electrical resistance of the sensitive elements A1 to A16 as the change in the current flowing through the sensitive elements A1 to A16. Therefore, the pulse outputs PL1 to PL16 are current signals whose magnitudes change according to the electrical resistance of the sensitive elements A1 to A16, respectively.
- the acquisition unit 53 When the acquisition unit 53 acquires the temperature change pattern data of the sensitive unit 2 and the pulse outputs PL1 to PL16 for one cycle of the sensitive elements A1 to A16, the acquisition unit 53 forms a pulse train in which the pulse outputs PL1 to PL16 are connected in a predetermined order. It is acquired as the output data PS (that is, the change pattern of the electrical characteristic value) of the sensitive unit 2.
- the output data PS1 to PS3 shown in FIG. 6 are examples of the output data PS in a state where the sensitive portion 2 is exposed to three types of sample gases having different compositions. Since the 16 sensitive elements A1 to A16 have different sensitivity characteristics to the molecule to be detected, the output data PS1 to PS3 have pulse trains in which the change patterns of the electrical characteristic values are different from each other.
- FIGS. 7 to 9 show an example of the output data of the sensitive unit 2 obtained in a state where the sensitive unit 2 is exposed to three types of sample gas containing three types of odor molecules and a standard gas.
- PS0 is the standard output data of the sensitive unit 2 in a state where the sensitive unit 2 is exposed to the standard gas.
- PS11 is the output data when the sensitive part 2 is exposed to the sample gas containing 2 ppm benzaldehyde
- PS12 is the output data when the sensitive part 2 is exposed to the sample gas containing 2 ppm nonanal
- PS13 is the output data when the sensitive part 2 is exposed to 2 ppm pyrrole. This is output data in a state where the sensitive portion 2 is exposed to the contained sample gas.
- FIG. 1 is the standard output data of the sensitive unit 2 in a state where the sensitive unit 2 is exposed to the standard gas.
- PS11 is the output data when the sensitive part 2 is exposed to the sample gas containing 2 ppm benzaldehyde
- PS12 is
- FIG. 7 shows output data when the temperature of the sensitive portion 2 is changed in the temperature range of 25 ° C. or higher and 50 ° C. or lower
- FIG. 8 shows the temperature of the sensitive portion 2 of 0 ° C. or higher and 25 ° C. or lower.
- the output data when the temperature is changed in the following temperature range is shown
- FIG. 9 shows the output data when the temperature of the sensitive portion 2 is changed in the temperature range of ⁇ 20 ° C. or higher and 5 ° C. or lower.
- the temperature control unit 51 has a temperature rise period UT1 that raises the temperature of the positive characteristic sensitive element and a temperature decrease period DT1 that lowers the temperature of the positive characteristic sensitive element within the temperature range of 20 ° C. or higher and 50 ° C. or lower. It is preferable to change the temperature of the positive characteristic sensitive element by a temperature change pattern including.
- the negative characteristic sensitive element sensitivity
- the positive characteristic sensitive element sensitive elements A12 to A16
- the difference between the output data when exposed to the standard gas and the output data when exposed to the sample gas containing the odor molecule is more remarkable. Therefore, when the temperature of the sensitive unit 2 changes in the temperature range of ⁇ 20 ° C. or higher and 20 ° C. or lower, the air quality state of the sample gas is determined from the output data of the negative characteristic sensitive elements (sensitive elements A1 to A11). It will be easier.
- the temperature control unit 51 has a temperature rise period UT1 that raises the temperature of the negative characteristic sensitive element and a temperature decrease period DT1 that lowers the temperature of the negative characteristic sensitive element within the temperature range of ⁇ 20 ° C. or higher and 20 ° C. or lower. It is preferable to change the temperature of the negative characteristic sensitive element by a temperature change pattern including.
- the sensitive portion 2 of the present embodiment includes the sensitive elements A1 to A11 in which the resistance value changes remarkably due to the adsorption / desorption of odor molecules in the temperature range of ⁇ 20 ° C. or higher and 20 ° C. or lower, and 20 ° C. or higher. Moreover, it contains the sensitive elements A12 to A16 in which the resistance value changes remarkably due to the adsorption / desorption of odor molecules in the temperature range of 50 ° C. or lower. Therefore, when the temperature of the sensitive unit 2 is changed, the resistance value change due to the adsorption / desorption of the odor molecule is remarkable in the temperature change range of the sensitive unit 2, that is, the pulse output of the sensitive element having high sensitivity to the odor molecule.
- the state of air quality of the sample gas can be determined based on the above. Therefore, the air quality determination system 1 can accurately determine the state of the air quality of the sample gas.
- the learning unit 54 generates the trained model MD1. That is, the learning unit 54 is in charge of the learning phase.
- the learning unit 54 stores the temperature change pattern data acquired by the acquisition unit 53 and the output data PS of the sensitive elements A1 to A16 as learning data for generating the trained model MD1.
- the learning unit 54 generates a trained model MD1 based on the collected learning data. That is, the learning unit 54 uses the learning data for machine learning acquired by the air quality determination system 1 to input the change pattern (output) of the electrical characteristic values of the sensitive elements A1 to A16 to the artificial intelligence program (algorithm). The relationship between the data PS) and the air quality state of the sample gas is learned.
- the artificial intelligence program is a machine learning model, and for example, a neural network which is a kind of hierarchical model is used.
- the learning unit 54 generates the trained model MD1 by causing the neural network to perform machine learning (for example, deep learning) with the training data, and stores it in the storage unit 52.
- the learning unit 54 may improve the performance of the trained model MD1 by performing re-learning using the learning data newly collected by the acquisition unit 53 after the trained model MD1 is generated.
- the determination unit 55 is in charge of the so-called inference phase.
- the determination unit 55 determines the air quality state of the sample gas based on the output data PS acquired by the acquisition unit 53 by using the learned model MD1 stored in the storage unit 52.
- the determination unit 55 is the electricity of the sensitive unit 2 in a state where the temperature control unit 51 controls the temperature control element 3 so that the temperature of the sensitive unit 2 exposed to the sample gas changes in a temperature change pattern.
- the sensitive unit 2 includes a plurality of sensitive elements Ax (sensitive elements A1 to A16).
- the determination unit 55 determines the sample based on the change pattern of the electrical characteristics of the plurality of sensitive elements Ax in a state where the temperature of the plurality of sensitive elements Ax exposed to the sample gas is changed by the above temperature change pattern. Determine the air quality of the gas. Further, the determination unit 55 inputs the measurement data of the temperature change pattern by the temperature sensor 4 acquired by the acquisition unit 53 and the output data PS into the trained model MD1. The trained model MD1 makes an inference based on the output data PS when the temperature of the sensitive unit 2 changes in the above temperature change pattern, and determines the state of the air quality of the sample gas. As described above, in the temperature range of ⁇ 20 ° C. or higher and 20 ° C.
- the change in the resistance value to the odor molecule is larger in the negative electrode sensitive element than in the positive sensitive element.
- the state of air quality is determined by placing importance on the output data of A1 to A11. Further, in the temperature range of 20 ° C. or higher and 50 ° C. or lower, the change in the resistance value to the odor molecule is larger in the positive electrode sensitive element than in the negative electrode sensitive element. Emphasis is placed on the output data to determine the air quality status.
- the determination unit 55 determines the presence or absence of odor molecules in the sample gas as the state of air quality of the sample gas, and determines whether or not the amount of odor molecules contained in the sample gas is equal to or greater than the threshold value. Judging. When the determination unit 55 determines that the sample gas contains odor molecules, the determination unit 55 may further determine the concentration of the odor molecules in the sample gas.
- the air quality determination system 1 includes the learning unit 54, and the determination unit 55 may perform the inference phase using the learned model MD1 generated by the external computer system.
- the output unit 56 outputs the determination result of the determination unit 55. Specifically, the output unit 56 displays the determination result of the determination unit 55 on the display unit 57 by outputting the determination result of the determination unit 55 to the display unit 57.
- the output of the determination result by the output unit 56 is not limited to the display on the display unit 57, and the determination result such as the presence or absence of odor molecules may be output by sound using a buzzer or a speaker.
- FIG. 19 is a schematic external view of the sensor module 6.
- the sensor module 6 is formed by laminating a temperature control element 3 having a substrate 32 having a heater wiring 33 formed on the main surface and a sensitive portion 2 having a substrate 20 having a plurality of sensitive elements Ax on the main surface. It is configured as one part.
- the sensor module 6 comprises a sensitive unit 2 whose electrical characteristic value changes in response to one or a plurality of types of molecules, and a temperature control element 3 that heats and cools the sensitive unit 2.
- the temperature control element 3 generates heat when energized from the determination module 5, and heats the sensitive portion 2.
- the temperature of the sensitive unit 2 exposed to the sample gas has at least a temperature rise period in which the temperature of the sensitive unit 2 rises and a temperature decrease period in which the temperature of the sensitive unit 2 falls in a predetermined measurement period.
- the temperature of the sensitive portion 2 is changed so as to change according to the temperature change pattern included once.
- the sensor module 6 including the sensitive portion 2 and the temperature control element 3 is realized by a laminated body in which the substrate 20 of the sensitive portion 2 and the substrate 30 of the temperature control element 3 are laminated. Therefore, if a plurality of types of sensor modules 6 corresponding to a plurality of applications are prepared, the air quality determination system 1 can be provided by arranging one or a plurality of sensor modules 6 corresponding to the desired applications in the storage space 11. It can be used for one or more purposes.
- the user of the air quality determination system 1 starts the processing unit 50 by turning on, for example, a power switch or the like, and causes the air quality determination system 1 to start an operation of determining the air quality of the sample gas.
- the user of the air quality determination system 1 introduces the sample gas into the storage space 11 through the introduction port 12 and exposes the sensitive portion 2 to the sample gas (exposure step ST1).
- the temperature of the sensitive unit 2 changes in a temperature change pattern in which the temperature rise period UT1 and the temperature decrease period DT1 are alternately repeated by controlling the temperature control unit 51.
- the temperature of the sensitive unit 2 is controlled so as to be (temperature change step ST2).
- the acquisition unit 53 acquires the change pattern of the electrical characteristic value of the sensitive unit 2 in a state where the temperature of the sensitive unit 2 changes in the above temperature change pattern (acquisition step ST3).
- the acquisition unit 53 is charged with electricity of the sensitive unit 2 at the timing when several cycles of the temperature change cycle including the temperature rise period UT1 and the temperature decrease period DT1 have elapsed from the timing when the temperature change step ST2 is started. It is preferable to acquire the change pattern of the target characteristic value.
- the acquisition unit 53 can acquire the change pattern of the electrical characteristic value of the sensitive unit 2 while the change pattern of the electrical characteristic value of the sensitive unit 2 is stable.
- the determination unit 55 determines the change pattern of the electrical characteristic value acquired by the acquisition unit 53 and the sensitive unit 2 detected by the temperature sensor 4.
- the state of the air quality of the sample gas is determined (determination step ST4).
- the output unit 56 When the determination unit 55 determines the state of the air quality of the sample gas, the output unit 56 outputs the determination result of the determination unit 55 to the display unit 57 (output step ST5). In other words, in the output step ST5, the determination result of the determination step is output. As a result, the user of the air quality determination system 1 can confirm the state of the air quality of the sample gas by confirming the display content of the display unit 57. Further, in the output step ST5, the determination result of the determination step may be output to an external system, and the determination result of the determination step can be used in the external system.
- the change in the electrical characteristic value due to the temperature is relatively large with respect to the change in the electrical characteristic value for the molecule to be detected, the influence of the temperature around the sensitive portion 2 on the determination cannot be ignored.
- the change in the electrical characteristic value with respect to the molecule is increased by using the sensitive element Ax of the sensitive material suitable for the temperature change pattern given to the sensitive portion 2, thereby increasing the air.
- the state of quality can be judged with higher accuracy.
- electricity caused by temperature is obtained by taking the difference between the change pattern of the electric characteristic value with respect to the molecule to be detected and the change pattern of the electric characteristic value with respect to the standard gas.
- the change pattern of the electrical characteristic value that reduces the change of the target characteristic value is acquired, and the state of the air quality can be determined with higher accuracy based on this change pattern.
- the above embodiment is only one of the various embodiments of the present disclosure.
- the above embodiment can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved.
- the same function as the air quality determination system 1 may be realized by an air quality determination method, a computer program, a non-temporary recording medium on which the program is recorded, or the like.
- the air quality determination method according to one embodiment includes an exposure step, a temperature change step, and a determination step. In the exposure step, the sensitive portion 2 is exposed to the sample gas.
- the sensitive portion 2 has the organic composition 21 and the conductive particles 22 dispersed in the organic composition 21, and the electrical characteristic values change in response to one or a plurality of types of molecules having sensitivity.
- the temperature of the sensitive portion 2 exposed to the sample gas is changed in a temperature change pattern including the temperature raising period UT1 and the temperature lowering period DT1 at least once.
- the temperature rising period UT1 is a period in which the temperature of the sensitive portion 2 rises
- the temperature lowering period DT1 is a period in which the temperature of the sensitive portion 2 drops.
- the determination step the state of the air quality of the sample gas is determined based on the change pattern of the electrical characteristic value in the state where the temperature of the sensitive portion 2 exposed to the sample gas is changed by the temperature change pattern.
- the (computer) program according to one aspect is a program for causing a computer system to execute an exposure step, a temperature change step, and a determination step.
- the air quality determination system 1 in the present disclosure includes a computer system in the processing unit 50 and the like.
- the computer system mainly consists of a processor and a memory as hardware.
- the processor executes the program recorded in the memory of the computer system, the function as the air quality determination system 1 in the present disclosure is realized.
- the program may be pre-recorded in the memory of the computer system, may be provided through a telecommunications line, and may be recorded on a non-temporary recording medium such as a memory card, optical disk, hard disk drive, etc. that can be read by the computer system. May be provided.
- the processor of a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI).
- the integrated circuit such as IC or LSI referred to here has a different name depending on the degree of integration, and includes an integrated circuit called a system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration).
- an FPGA Field-Programmable Gate Array
- a plurality of electronic circuits may be integrated on one chip, or may be distributed on a plurality of chips.
- a plurality of chips may be integrated in one device, or may be distributed in a plurality of devices.
- the computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microprocessor is also composed of one or a plurality of electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.
- the air quality determination system 1 it is not an essential configuration for the air quality determination system 1 that a plurality of functions in the air quality determination system 1 are integrated in one housing, and the components of the air quality determination system 1 are a plurality of housings. It may be distributed in the air. Further, at least a part of the functions of the air quality determination system 1, for example, a part of the functions of the air quality determination system 1 may be realized by a cloud (cloud computing) or the like.
- the air quality determination system 1 of the modification 1 is different from the above embodiment in that the determination unit 55 determines the air quality state of the sample gas based on the difference between the first change pattern and the second change pattern.
- the first change pattern is a change pattern (output data PS) of the electrical characteristic value in a state where the temperature of the sensitive portion 2 exposed to the sample gas is changed by the above temperature change pattern.
- the second change pattern is a change pattern (standard output data PS0) of the electrical characteristic value of the sensitive unit 2 in a state where the temperature of the sensitive unit 2 exposed to the standard gas is changed by the above temperature change pattern. Since the configurations other than the determination unit 55 are the same as those in the above embodiment, the same reference numerals are given to the common components, and the description thereof will be omitted.
- the acquisition unit 53 acquires the pulse outputs PL1 to PL16 from the 16 sensitive elements A1 to A16 in a state where the temperature of the sensitive unit 2 exposed to the sample gas is changed by the above temperature change pattern.
- the acquisition unit 53 acquires the pulse outputs PL1 to PL1.
- the output data (first change pattern) in which ⁇ PL16 is connected is obtained.
- standard output data PS0 second change pattern when the temperature of the sensitive unit 2 is changed in a plurality of temperature change patterns while the sensitive unit 2 is exposed to the standard gas is previously stored in the storage unit 52. It is remembered.
- the acquisition unit 53 acquires the standard output data PS0 corresponding to the temperature change pattern of the sensitive unit 2 from the storage unit 52 based on the temperature detection result acquired from the temperature sensor 4, and obtains the output data of the first change pattern and the output data of the first change pattern.
- the difference data which is the difference from the standard output data PS0 of the second change pattern, is obtained, and this difference data is output to the determination unit 55.
- the trained model MD1 generated by using the difference data as the training data is stored in the storage unit 52. Therefore, the determination unit 55 inputs the difference data, which is the difference between the output data of the first change pattern and the standard output data PS0 of the second change pattern, into the trained model MD1 to check the air quality state of the sample gas. It can be determined.
- the difference data D1 to D3 shown in FIG. 11 were calculated based on the output data PS11 to PS13 and the standard output data PS0 in a state where the temperature of the sensitive unit 2 was changed in the temperature range of 25 ° C. or higher and 50 ° C. or lower. It is data.
- the difference data D1 to D3 shown in FIG. 12 were calculated based on the output data PS11 to PS13 and the standard output data PS0 in a state where the temperature of the sensitive unit 2 was changed in the temperature range of 0 ° C. or higher and 25 ° C. or lower. It is data.
- the difference data D1 to D3 shown in FIG. 13 are calculated based on the output data PS11 to PS13 and the standard output data PS0 in a state where the temperature of the sensitive unit 2 is changed in the temperature range of ⁇ 20 ° C. or higher and 5 ° C. or lower. Data.
- the difference data D1 is the difference data obtained by subtracting the standard output data PS0 from the output data PS11 when the sensitive portion 2 is exposed to the sample gas containing 2 ppm of benzaldehyde.
- the difference data D2 is the difference data obtained by subtracting the standard output data PS0 from the output data PS12 when the sensitive portion 2 is exposed to the sample gas containing 2 ppm of nonanal.
- the difference data D3 is the difference data obtained by subtracting the standard output data PS0 from the output data PS13 when the sensitive portion 2 is exposed to the sample gas containing 2 ppm of pyrrole.
- the standard output data PS0 is subtracted from the output data when the sensitive portion 2 is exposed to the sample gas containing the odor molecule to obtain the difference data D1 to D3.
- the difference data D1 to D3 the change in the resistance value due to the temperature change in the sensitive unit 2 is removed, and only the change in the resistance value due to the odor molecule remains. Therefore, the determination unit 55 determines the difference data D1.
- the state of the air quality of the sample gas can be determined with high accuracy based on D3.
- the determination unit 55 determines the sample gas from the difference value of the pulse signal corresponding to the negative characteristic sensitive element (sensitive element A1 to A11) in the difference data D1 to D3. The air quality can be obtained accurately.
- the determination unit 55 determines the air of the sample gas from the difference value of the pulse signal corresponding to the positive characteristic sensitive element (sensitive element A12 to A16) in the difference data D1 to D3. The quality can be determined accurately.
- Modification 2 is different from the above embodiment in that the sensitive unit 2 includes a plurality of sensitive modules, but since the other than the sensitive unit 2 are common to the above embodiment, the same components are designated by the same reference numerals. The description thereof will be omitted.
- the sensitive unit 2 includes a plurality of sensitive modules, and the plurality of sensitive modules are arranged in the storage space 11 of the sensor storage chamber 10.
- the sensitive unit 2 includes three sensitive modules 2A to 2C.
- the air quality determination system 1 of the modification 2 includes a temperature control element 3 that individually controls the temperatures of the three sensitive modules 2A to 2C.
- the air quality determination method includes a temperature control step, an acquisition step, and a determination step.
- the temperature control step the temperature of the plurality of sensitive modules 2A to 2C exposed to the sample gas in each of the plurality of sensitive modules 2A to 2C during a predetermined measurement period has a temperature rise period and a temperature decrease period at least once. It is controlled so that it changes according to the temperature change pattern including each.
- the acquisition step the electrical characteristic values of each of the plurality of sensitive modules 2A to 2C exposed to the sample gas are acquired.
- a trained model for determining the air quality state of the sample gas is used, and the air quality state of the sample gas is based on the change in the electrical characteristic value of each of the plurality of sensitive modules 2A to 2C. Make a judgment.
- the air quality determination system 1 of the modification 2 determines the plurality of sensitive modules 2A to 2C, the sensor storage chamber 10 as an exposure unit, the temperature control element 3, the temperature control unit 51, and the acquisition unit 53.
- a unit 55 and an output unit 56 are provided.
- the plurality of sensitive modules 2A to 2C change their electrical property values in response to one or a plurality of types of molecules.
- the exposed portion exposes a plurality of sensitive modules 2A to 2C to the sample gas during a predetermined measurement period.
- the temperature control element 3 heats and cools at least one of the plurality of sensitive modules 2A to 2C.
- the control unit 51 sets the temperature of each of the plurality of sensitive modules 2A to 2C exposed to the sample gas at least once during the temperature rise period and the temperature decrease period during the predetermined measurement period.
- the temperature control element 3 is controlled so as to change according to the included temperature change pattern.
- the acquisition unit 53 acquires the electrical characteristic values of the plurality of sensitive modules 2A to 2C in a predetermined measurement period.
- the determination unit 55 uses the trained model MD1 for determining the air quality state of the sample gas, and is based on the change in the electrical characteristic values of the plurality of sensitive modules 2A to 2C, and is based on the change in the air quality state of the sample gas. Make a judgment.
- the output unit 56 outputs the determination result of the determination unit 55.
- each of the plurality of sensitive modules 2A to 2C has a plurality of sensitive elements having different sensitivity characteristics and a substrate on which the plurality of sensitive elements are formed, and the plurality of sensitive modules 2A to 2C have a plurality of sensitive elements.
- the plurality of substrates having are separate substrates.
- the plurality of sensitive modules 2A to 2C include at least the first sensitive module and the second sensitive module, and the substrate of the first sensitive module and the substrate of the second sensitive module are separate substrates.
- the sensitive module 2A has a substrate 20A provided with a plurality of sensitive elements A1 to A16
- the sensitive module 2B has a substrate 20B provided with a plurality of sensitive elements A1 to A16, and is sensitive.
- the module 2C has a substrate 20C provided with a plurality of sensitive elements A1 to A16.
- a temperature control element 3 is provided on each of the substrates 20A to 20C, and the temperature of each of the sensitive modules 2A to 2C is controlled by the individually provided temperature control element 3.
- the combination of the plurality of sensitive elements each of the plurality of (three in the modified example 2) sensitive modules 2A to 2C is the plurality of (three in the modified example 2) sensitive modules 2A to 2C. It is the same. Specifically, each of the plurality of sensitive modules 2A to 2C has a combination of 16 sensitive elements A1 to A16.
- the temperature of the plurality of sensitive modules 2A to 2C is changed in a temperature change pattern including the temperature rising period and the temperature lowering period at least once, but the temperature is raised by the plurality of sensitive modules 2A to 2C. At least one of the period and the temperature lowering period is staggered in time.
- the plurality of sensitive modules 2A to 2C include at least the first sensitive module and the second sensitive module, and in the temperature control step, at least one of the temperature raising period and the temperature lowering period of the first sensitive module is set to the first. It is staggered in time from the 2 sensitive modules.
- FIG. 15 is a graph showing temperature changes of the three sensitive modules 2A to 2C. In the temperature control step, the temperatures of the three sensitive modules 2A to 2C are set in a period CT1 including a temperature rise period UT1 and a temperature decrease period DT1. Each is changing.
- the temperatures of the three sensitive modules 2A to 2C are changed by providing a time difference (CT1 / 3) of one-third of the one-cycle CT1 including the temperature raising period UT1 and the temperature lowering period DT1. Therefore, in the determination step, the state of the air quality can be determined each time the time corresponding to the time difference (CT1 / 3) elapses.
- CT1 / 3 time difference
- the cycle for executing the determination step is one cycle CT1
- n is an integer of 2 or more. Can shorten the cycle for executing the determination step to one-nth of the time (CT1 / n) of one cycle CT1.
- each of the plurality of sensitive modules 2A to 2C has a plurality of sensitive elements A1 to A4 having different sensitivity characteristics from each other, and each of the plurality of sensitive elements A1 to A4 possessed by the plurality of sensitive modules 2A to 2C is 1. It is formed on one substrate 20.
- the plurality of sensitive modules 2A to 2C include at least the first sensitive module and the second sensitive module, and the first sensitive module and the second sensitive module have a plurality of sensitive elements having different sensitivity characteristics from each other. It has A1 to A4.
- the plurality of sensitive elements A1 to A4 of the first sensitive module and the plurality of sensitive elements A1 to A4 of the second sensitive module are formed on one substrate 20.
- the sensitive elements A1 to A4 of the sensitive module 2A, the sensitive elements A1 to A4 of the sensitive module 2B, and the sensitive elements A1 to A4 of the sensitive module 2C are three. Arranged in a column. Then, on the second surface (back surface of the first surface) of the substrate 20, the temperature control element 3A for changing the temperature of the sensitive module 2A is on the back side of the portion where the sensitive elements A1 to A4 of the sensitive module 2A are arranged. Is placed. Further, on the second surface of the substrate 20, a temperature control element 3B for changing the temperature of the sensitive module 2B is arranged on the back side of a portion where the sensitive elements A1 to A4 of the sensitive module 2B are arranged. Further, on the second surface of the substrate 20, a temperature control element 3C for changing the temperature of the sensitive module 2C is arranged on the back side of a portion where the sensitive elements A1 to A4 of the sensitive module 2C are arranged.
- the temperatures of the sensitive modules 2A to 2C are individually controlled. can do.
- the sensitive unit 2 includes three sensitive modules 2A to 2C, but the number of sensitive modules is not limited to three.
- the sensitive unit 2 may include a plurality of sensitive modules, and the number of sensitive modules may be two or four or more.
- the combination of the plurality of sensitive elements possessed by the plurality of sensitive modules may be different from each other in the plurality of sensitive modules.
- the plurality of sensitive modules include at least the first sensitive module and the second sensitive module, and the combination of the plurality of sensitive elements possessed by the first sensitive joule and the plurality of sensitive elements possessed by the second sensitive module.
- the combination of may be different from each other.
- FIG. 18 shows an example of the three sensitive modules 2D to 2F included in the sensitive unit 2.
- the sensitive module 2D includes 16 sensitive elements A1 to A16 and a substrate 20D on which 16 sensitive elements A1 to A16 are arranged.
- the sensitive module 2E includes 16 sensitive elements A17 to A32 and a substrate 20E on which 16 sensitive elements A17 to A32 are arranged.
- the sensitive module 2F includes 16 sensitive elements A33 to A48 and a substrate 20F on which 16 sensitive elements A33 to A48 are arranged.
- the air quality determination system 1 includes a temperature control element 3 that individually controls the temperature of each of the sensitive modules 2D to 2F.
- each of the plurality of sensitive modules 2D to 2F has a combination of a plurality of sensitive elements suitable for a desired purpose.
- the applications of the plurality of sensitive modules 2D to 2F include, for example, the use of determining the odor of gas (exhaled breath, etc.) emitted from the human body, the presence or absence of gas emitted when the food rots, or the quality of the food by determining the gas type.
- the air quality determination system 1 can execute determination processing corresponding to each of the plurality of applications by arranging a plurality of sensitive modules suitable for the plurality of applications in the storage space 11.
- the temperature change patterns for changing the temperatures of the plurality of sensitive modules 2D to 2F may be the same or different from each other. May be good.
- the temperature change patterns that change the temperature of the plurality of sensitive modules 2D to 2F may be time-shifted or may be the same in time.
- the first temperature change pattern that changes the temperature of the first sensitive module and the second sensitive module. It may be the same as the temperature change pattern that changes the temperature of, or may be different from each other.
- the first temperature change pattern and the second temperature change pattern are the same as the temperature rise period and the temperature decrease period of the first temperature change pattern, and the temperature rise period and the temperature decrease period of the second temperature change pattern. It means that the temperature is the same during the temperature rise period and the temperature decrease period.
- the difference between the first temperature change pattern and the second temperature change pattern may mean that at least one of the temperature rise period and the temperature decrease period is different, or at least one of the temperature in the temperature rise period and the temperature in the temperature decrease period is different. It may be that. Further, the difference between the first temperature change pattern and the second temperature change pattern is that at least one of the temperature rise period and the temperature decrease period is different, and at least one of the temperature in the temperature rise period and the temperature in the temperature decrease period is different. good.
- the temperature control element 3 is the electric heating element 31, but in the temperature control element 3, both the temperature rise and the temperature decrease of the sensitive portion 2 are performed. It may be a possible Pelche element. Further, the temperature control element 3 may include at least one of a Pelche element and an electric heating element. In the above embodiment, since the temperature control element 3 is the electric heating element 31, the temperature control element 3 can be downsized and the power consumption can be reduced as compared with the case where the Pelche element is used as the temperature control element 3. realizable.
- the sensitive unit 2 includes 16 sensitive elements Ax, but the number of sensitive elements Ax can be changed as appropriate.
- the sensitive unit 2 includes both a negative characteristic sensitive element and a positive characteristic sensitive element, but the sensitive unit 2 may include only a negative characteristic sensitive element or may include only a positive characteristic sensitive element. good.
- 16 sensitive elements Ax are arranged in 4 rows and 4 columns, but the arrangement of the plurality of sensitive elements Ax is not limited to the arrangement of the above embodiment, and a plurality of them.
- the sensitive elements may be arranged so as to be arranged in a line, or may be arranged so as to be arranged at intervals on one or a plurality of concentric circles.
- the temperature control unit 51 controls the temperature control element 3 to change the temperatures of the sensitive elements A1 to A16 in the same temperature change pattern, but the sensitive elements A1 to A16.
- the temperature may be changed in different temperature change patterns.
- the sensitive elements A1 to A11 having high sensitivity to odor molecules in the temperature range of ⁇ 20 ° C. or higher and 25 ° C. or lower change the temperature within the temperature range of ⁇ 20 ° C. or higher and 25 ° C. or lower.
- the temperatures of the sensitive elements A12 to A16 which have high sensitivity to odor molecules in the temperature range of 20 ° C. or higher and 50 ° C. or lower, are changed in the temperature range of 20 ° C. or higher and 50 ° C. or lower.
- the electrical characteristic value of the sensitive unit 2 may be acquired via the network in the acquisition step.
- the trained model MD1 is stored in the storage unit 52 of the air quality determination system 1, but the air quality determination system 1 uses the trained model MD1 arranged on the cloud. It may be used to determine the state of air quality. That is, the determination unit 55 of the air quality determination system 1 shows a change pattern of the electrical characteristic value (resistance value) in a state where the temperature of the sensitive unit 2 exposed to the sample gas is changed by the above temperature change pattern. Input the output data to the trained model on the cloud. That is, the trained model on the cloud performs the determination process using the electrical characteristic value of the sensitive unit 2 acquired via the network, and transmits the determination result to the determination unit 55. In this way, the determination unit 55 may determine the state of the air quality of the sample gas by acquiring the determination result from the trained model on the cloud.
- the determination unit 55 may determine the state of the air quality of the sample gas by acquiring the determination result from the trained model on the cloud.
- the server having the function of the determination module 5 acquires the electrical characteristic value from the sensitive unit 2 via the network, and the determination unit 55 performs the determination process using the acquired electrical characteristic value of the sensitive unit 2. May be good.
- the server having the function of the determination module 5 may acquire the electrical characteristic value of the sensitive unit 2 in real time and perform the determination process, or store the time-series data of the electrical characteristic value of the sensitive unit 2.
- the time-series data of the electrical characteristic value of the sensitive unit 2 may be acquired from a data server or the like to perform the determination process.
- the air quality determination method of the first aspect is an air quality determination method using a sensitive portion (2) whose electrical characteristic value changes in response to one or a plurality of types of molecules, and is temperature controlled. It includes a step, an acquisition step, a determination step, and an output step.
- the temperature control step the temperature of the sensitive portion (2) exposed to the sample gas is lowered in the temperature rise period in which the temperature of the sensitive portion (2) rises and the temperature of the sensitive portion (2) is lowered in the predetermined measurement period. It is controlled so as to change in a temperature change pattern including the temperature lowering period at least once.
- the acquisition step the electrical characteristic values of the sensitive portion (2) exposed to the sample gas are acquired.
- the determination step a trained model for determining the air quality state of the sample gas is used, and the air quality state of the sample gas is determined based on the change in the electrical characteristic value.
- the output step the determination result of the determination step is output.
- the sensitive part (2) reacts with the sensitive molecule and the electric characteristic value of the sensitive part (2) changes, the change pattern of the electric characteristic value in the temperature raising period and the temperature lowering period is changed.
- the sensitive part (2) fluctuates from the change pattern in the absence of sensitive molecules. Therefore, in the determination step, the state of the air quality of the sample gas can be determined based on the changes in the electrical characteristic values during the temperature rise period and the temperature decrease period, and erroneous determination due to the fluctuation due to the temperature can be suppressed. Deterioration of quality condition determination accuracy can be suppressed.
- the air quality state of the sample gas is determined based on the difference between the first change pattern and the second change pattern.
- the first change pattern is a change pattern of the electrical characteristic value in a state where the temperature of the sensitive portion (2) exposed to the sample gas is changed by the temperature change pattern.
- the second change pattern is a change pattern of the electrical characteristic value in a state where the temperature of the sensitive portion (2) exposed to the standard gas is changed by the temperature change pattern.
- the fluctuation amount of the electrical characteristic value caused by changing the temperature of the sensitive portion (2) by the above temperature change pattern can be obtained. Can be reduced. Therefore, in the determination step, the state of the air quality of the sample gas can be accurately determined based on the difference between the first change pattern and the second change pattern.
- the sensitive unit (2) includes a plurality of sensitive elements (Ax) having different sensitive characteristics from each other.
- the determination step based on the change pattern of the electrical characteristic values of the plurality of sensitive elements (Ax) in a state where the temperatures of the plurality of sensitive elements (Ax) exposed to the sample gas are changed by the above temperature change pattern, Determine the air quality status of the sample gas.
- the state of the air quality of the sample gas is determined based on the change pattern of the electrical characteristic values of the plurality of sensitive elements (Ax), compared with the case where the number of the sensitive elements (Ax) is one. Therefore, it becomes possible to determine the air quality of the sample gas containing more types of molecules.
- the sensitive portion (2) is a negative characteristic sensitive element having a negative resistance coefficient in a temperature region of ⁇ 20 ° C. or higher and 50 ° C. or lower. (A1 to A11) are included.
- the state of the air quality of the sample gas can be determined based on the change pattern of the electrical characteristic value of the sensitive portion (2) including the negative characteristic sensitive elements (A1 to A11).
- the temperature of the negative characteristic sensitive element (A1 to A11) is raised within the temperature range of ⁇ 20 ° C. or higher and 20 ° C. or lower.
- the temperature of the negative characteristic sensitive elements (A1 to A11) is changed by a temperature change pattern including a temperature rise period and a temperature decrease period for lowering the temperature of the negative characteristic sensitive elements (A1 to A11).
- the sample gas is based on the change pattern of the electrical characteristic value when the temperature of the negative characteristic sensitive element (A1 to A11) is increased and decreased within the temperature range of ⁇ 20 ° C. or higher and 20 ° C. or lower.
- the state of air quality can be determined.
- the negative characteristic sensitive elements (A1 to A11) are dispersed in the organic composition (21) and the organic composition (21). It has conductive particles (22).
- the organic composition (21) contained in the negative property sensitive elements (A1 to A11) has a siloxane in the main chain and a methyl group in the side chain.
- the state of the air quality of the sample gas can be determined based on the change pattern of the electrical characteristic value of the sensitive portion (2) including the negative characteristic sensitive elements (A1 to A11).
- the sensitive portion (2) has a positive drag coefficient in a temperature region of ⁇ 20 ° C. or higher and 50 ° C. or lower. Includes elements (A12 to A16).
- the state of the air quality of the sample gas can be determined based on the change pattern of the electrical characteristic value of the sensitive portion (2) including the positive characteristic sensitive element (A12 to A16).
- the temperature of the positive characteristic sensitive element (A12 to A16) is raised within the temperature range of 20 ° C. or higher and 50 ° C. or lower.
- the temperature of the positive characteristic sensitive element (A12 to A16) is changed by a temperature change pattern including a temperature period and a temperature decrease period for lowering the temperature of the positive characteristic sensitive element (A12 to A16).
- the sample gas is based on the change pattern of the electrical characteristic value when the temperature of the positive characteristic sensitive element (A12 to A16) is increased and decreased within the temperature range of 20 ° C. or higher and 50 ° C. or lower.
- the state of air quality can be determined.
- the positive characteristic sensitive elements (A12 to A16) are contained in the organic composition (21) and the organic composition (21). It has dispersed conductive particles (22).
- the positive characteristic sensitive element (A12 to A16) includes at least one of the first to fourth sensitive elements (A12 to A16).
- the first sensitive element (A12) has an organic composition (21) having a siloxane in the main chain, no methyl group in the side chain, and a polyethylene glycol group in the side chain.
- the second sensitive element (A13) has an organic composition (21) having polyethylene glycol in the main chain, no methyl group in the side chain, and a nitro group in the side chain.
- the third sensitive element (A14, A15) has an organic composition (21) having a siloxane in the main chain, no methyl group in the side chain, and a cyanopropyl group in the side chain.
- the fourth sensitive element (A16) has an organic composition (21) having a siloxane in the main chain, no methyl group in the side chain, and a cyanoallyl group in the side chain.
- the state of the air quality of the sample gas can be determined based on the change pattern of the electrical characteristic value of the sensitive portion (2) including the positive characteristic sensitive element (A12 to A16).
- the temperature control element (3) that performs at least one of heating and cooling of the sensitive portion (2) is controlled. By doing so, the temperature of the sensitive unit (2) is controlled.
- the temperature control element (3) includes at least one of a Pelche element and an electric heating element.
- the temperature of the sensitive portion (2) can be changed in a temperature change pattern by using at least one of the Pelche element and the electric heating element.
- the electrical characteristic value of the sensitive unit (2) is acquired via the network.
- the determination step can be executed by the determination unit realized on the cloud.
- the air quality determination method is an air quality determination method using a sensitive portion (2) whose electrical characteristic value changes in response to one or a plurality of types of molecules, and includes a temperature control step and an acquisition step. , A determination step, and an output step.
- the sensitive unit (2) includes a plurality of sensitive modules (2A to 2F).
- the temperature control step the temperature of the plurality of sensitive modules (2A to 2F) exposed to the sample gas is increased in each of the plurality of sensitive modules (2A to 2F) during a predetermined measurement period. It is controlled so as to change in a temperature change pattern including at least once the temperature drop period and the temperature drop period.
- the acquisition step the electrical characteristic values of each of the plurality of sensitive modules (2A to 2F) exposed to the sample gas are acquired.
- a trained model for determining the air quality state of the sample gas is used, and the air quality of the sample gas is based on the change in the electrical characteristic value of each of the plurality of sensitive modules (2A to 2F). Determine the state.
- the output step the determination result of the determination step is output.
- the air quality state can be determined based on the change in the electrical characteristic value acquired from each of the plurality of sensitive modules (2A to 2F). ..
- each of the plurality of sensitive modules (2A to 2C) has a plurality of sensitive elements (Ax) having different sensitivity characteristics and a plurality of sensitive elements (Ax). ) Is formed on the substrate (20A to 20F).
- the plurality of substrates (20A to 20C) included in the plurality of sensitive modules (2A to 2C) are separate substrates.
- the temperature of each of the plurality of sensitive modules (2A to 2C) is set to a desired temperature. It can be changed with a change pattern.
- the combination of the plurality of sensitive elements (Ax) each of the plurality of sensitive modules (2A to 2C) is combined with the plurality of sensitive modules (2A to 2C). It is the same.
- the air quality is compared with the case where the air quality state is continuously determined by one sensitive module.
- the time interval for determining the state of is shortened.
- the combination of the plurality of sensitive elements possessed by the plurality of sensitive modules (2D to 2F) is different from each other in the plurality of sensitive modules (2D to 2F).
- each of the plurality of sensitive modules (2A to 2C) has a plurality of sensitive elements (A1 to A4) having different sensitivity characteristics from each other.
- a plurality of sensitive elements (A1 to A4) each of the plurality of sensitive modules (2A to 2C) are formed on one substrate (20).
- the number of parts can be reduced.
- the plurality of sensitive modules (2A to 2C) include at least the first sensitive module and the second sensitive module.
- the temperature control step at least one of the temperature raising period and the temperature lowering period of the first sensitive module is temporally shifted from that of the second sensitive module.
- At least one of the temperature raising period and the temperature lowering period of the first sensitive module is shifted in time from the second sensitive module, so that the air quality state is continuously determined by one sensitive module.
- the time interval for determining the state of air quality can be shortened as compared with the case where the air quality is determined.
- the air quality determination system (1) includes a sensitive unit (2), an exposed unit (10), a temperature control element (3), a control unit (51), a determination unit (55), and the like. It includes an output unit (56).
- the sensitive portion (2) changes its electrical characteristic value in response to one or a plurality of types of molecules.
- the exposed portion (10) exposes the sensitive portion (2) to the sample gas during a predetermined measurement period.
- the temperature control element (3) performs at least one of heating and cooling of the sensitive portion (2).
- the control unit (51) the temperature of the sensitive unit (2) exposed to the sample gas during the predetermined measurement period is changed by the temperature rise period in which the temperature of the sensitive unit (2) rises and the temperature of the sensitive unit (2).
- the temperature control element (3) is controlled so as to change in a temperature change pattern including a falling temperature decrease period at least once.
- the acquisition unit (53) acquires the electrical characteristic value of the sensitive unit (2) during a predetermined measurement period.
- the determination unit (55) uses a trained model (MD1) for determining the air quality state of the sample gas, and determines the air quality state of the sample gas based on the change in the electrical characteristic value.
- the output unit (56) outputs the determination result of the determination unit (55).
- the determination unit (55) can determine the state of the air quality of the sample gas based on the changes in the electrical characteristic values during the temperature rise period and the temperature decrease period, and suppresses erroneous judgment due to the fluctuation due to the temperature. It is possible to suppress deterioration of the determination accuracy of the air quality state.
- the air quality determination system (1) includes a plurality of sensitive modules (2A to 2C), an exposure unit (10), a temperature control element (3), a control unit (51), and a determination unit (1). 55) and an output unit (56).
- the plurality of sensitive modules (2A to 2C) change their electrical property values in response to one or a plurality of types of molecules.
- the exposure unit (10) exposes a plurality of sensitive modules (2A to 2C) to the sample gas during a predetermined measurement period.
- the temperature control element (3) heats and cools at least one of the plurality of sensitive modules (2A to 2C).
- the control unit (51) sets a temperature rise period in which the temperature of each of the plurality of sensitive modules (2A to 2C) exposed to the sample gas rises and a temperature fall period in which the temperature falls in a predetermined measurement period.
- the temperature control element (3) is controlled so as to change according to the temperature change pattern including at least once.
- the acquisition unit (53) acquires the electrical characteristic values of the plurality of sensitive modules (2A to 2C) in a predetermined measurement period.
- the determination unit (55) uses a trained model (MD1) for determining the air quality state of the sample gas, and the sample gas is based on changes in the electrical characteristic values of the plurality of sensitive modules (2A to 2C). Judgment of the air quality condition of.
- the output unit (56) outputs the determination result of the determination unit (55).
- the determination unit (55) can suppress erroneous determination due to fluctuations due to temperature, and can suppress deterioration of determination accuracy of the air quality state. Further, the determination unit (55) determines the state of air quality for each of the plurality of sensitive modules (2A to 2F) based on the change in the electrical characteristic value acquired from each of the plurality of sensitive modules (2A to 2F). Can be determined.
- the sensor module (6) of the twentieth aspect has a sensitive portion (2) whose electrical characteristic value changes in response to one or a plurality of types of molecules, and at least one of heating and cooling of the sensitive portion (2). It has a temperature control element (3) to be performed. In the temperature control element (3), during a predetermined measurement period, the temperature of the sensitive portion (2) exposed to the sample gas rises in the temperature of the sensitive portion (2) and the temperature of the sensitive portion (2). The temperature of the sensitive portion (2) is changed so as to change in a temperature change pattern including at least once the temperature lowering period in which the gas drops.
- the state of the air quality of the sample gas can be determined based on the changes in the electrical characteristic values during the temperature rise period and the temperature decrease period, and erroneous determination due to the fluctuation due to the temperature can be suppressed. Deterioration of quality condition determination accuracy can be suppressed.
- various configurations (including modifications) of the air quality determination system (1) include an air quality determination method, a (computer) program, or a non-temporary recording medium on which the program is recorded. It can be embodied by such as.
- the configurations according to the second to twelfth and thirteenth to seventeenth aspects are not essential configurations for the air quality determination method and can be omitted as appropriate.
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Abstract
Description
(1)概要
図1は、本実施形態に係る空気質判定システム1の概略的なシステム構成図である。
(2.1)構成
本実施形態の空気質判定システム1は、図1に示すように、上述の感応部2、温度制御素子3、及び、判定モジュール5、を備える。判定モジュール5は、温度制御部51、及び、判定部55を含む処理部50を備える。また、空気質判定システム1は、温度センサ4と、センサ収納室10と、を更に備え、判定モジュール5は、記憶部52と、表示部57と、を更に備えている。
本実施形態の空気質判定システム1の推論フェーズの動作を、図10のフローチャートに基づいて説明する。なお、図10に示すフローチャートは、本実施形態に係る空気質判定方法の一例に過ぎず、処理の順序が適宜変更されてもよいし、処理が適宜追加又は省略されてもよい。
上記実施形態は、本開示の様々な実施形態の一つに過ぎない。上記実施形態は、本開示の目的を達成できれば、設計等に応じて種々の変更が可能である。また、空気質判定システム1と同様の機能は、空気質判定方法、コンピュータプログラム、又はプログラムを記録した非一時的な記録媒体等で具現化されてもよい。一態様に係る空気質判定方法は、暴露ステップと、温度変化ステップと、判定ステップと、を含む。暴露ステップでは、感応部2を試料ガスに暴露する。感応部2は、有機組成物21及び有機組成物21の中に分散された導電粒子22を有し、感度を有する1又は複数種類の分子に反応して電気的特性値が変化する。温度変化ステップでは、試料ガスに暴露された感応部2の温度を、昇温期間UT1と降温期間DT1とを少なくとも1回ずつ含む温度変化パターンで変化させる。昇温期間UT1は感応部2の温度が上昇する期間であり、降温期間DT1は感応部2の温度が降下する期間である。判定ステップでは、試料ガスに暴露された感応部2の温度を温度変化パターンで変化させた状態での電気的特性値の変化パターンに基づいて、試料ガスの空気質の状態を判定する。一態様に係る(コンピュータ)プログラムは、コンピュータシステムに、暴露ステップと、温度変化ステップと、判定ステップと、を実行させるためのプログラムである。
変形例1の空気質判定システム1は、判定部55が、第1変化パターンと第2変化パターンとの差分に基づいて試料ガスの空気質の状態を判定する点で上記実施形態と相違する。第1変化パターンは、試料ガスに暴露された感応部2の温度を上記の温度変化パターンで変化させた状態での電気的特性値の変化パターン(出力データPS)である。第2変化パターンは、標準ガスに暴露された感応部2の温度を上記の温度変化パターンで変化させた状態での感応部2の電気的特性値の変化パターン(標準出力データPS0)である。なお、判定部55以外の構成は上記実施形態と同様であるので、共通する構成要素には同一の符号を付して、その説明は省略する。
変形例2の空気質判定システム1について図14及び図15を参照して説明を行う。
上記実施形態の空気質判定システム1では、温度制御素子3が電熱素子31であったが、温度制御素子3は、感応部2の昇温と降温の両方が可能なペルチェ素子でもよい。また、温度制御素子3は、ペルチェ素子及び電熱素子の少なくとも一方を含んでいればよい。なお、上記の実施形態では温度制御素子3が電熱素子31であるので、温度制御素子3としてペルチェ素子を用いる場合に比べて、温度制御素子3の小型化を実現でき、また消費電力の低減を実現できる。
以上説明したように、第1の態様の空気質判定方法は、1又は複数種類の分子に反応して電気的特性値が変化する感応部(2)を用いる空気質判定方法であり、温度制御ステップと、取得ステップと、判定ステップと、出力ステップと、を含む。温度制御ステップでは、所定の測定期間において、試料ガスに暴露された感応部(2)の温度を、感応部(2)の温度が上昇する昇温期間と感応部(2)の温度が降下する降温期間とを少なくとも1回ずつ含む温度変化パターンで変化するように制御する。取得ステップでは、試料ガスに暴露された感応部(2)の電気的特性値を取得する。判定ステップでは、試料ガスの空気質の状態を判定するための学習済みモデルを用い、電気的特性値の変化に基づいて、試料ガスの空気質の状態を判定する。出力ステップでは、判定ステップの判定結果を出力する。
2 感応部
3 温度制御素子
10 センサ収納室(暴露部)
21 有機組成物
22 導電粒子
51 温度制御部(制御部)
55 判定部
Ax 感応素子
A1~A11 負特性感応素子
A12 正特性感応素子(第1の感応素子)
A13 正特性感応素子(第2の感応素子)
A14,A15 正特性感応素子(第3の感応素子)
A16 正特性感応素子(第4の感応素子)
MD1 学習済みモデル
Claims (20)
- 1又は複数種類の分子に反応して電気的特性値が変化する感応部を用いる空気質判定方法であって、
所定の測定期間において、試料ガスに暴露された前記感応部の温度を、前記感応部の温度が上昇する昇温期間と前記感応部の温度が降下する降温期間とを少なくとも1回ずつ含む温度変化パターンで変化するように制御する温度制御ステップと、
前記試料ガスに暴露された前記感応部の前記電気的特性値を取得する取得ステップと、
前記試料ガスの空気質の状態を判定するための学習済みモデルを用い、前記電気的特性値の変化に基づいて、前記試料ガスの前記空気質の状態の判定を行う判定ステップと、
前記判定ステップの判定結果を出力する出力ステップと、を含む、
空気質判定方法。 - 前記判定ステップでは、第1変化パターンと第2変化パターンとの差分に基づいて前記試料ガスの前記空気質の状態を判定し、
前記第1変化パターンは、前記試料ガスに暴露された前記感応部の温度を前記温度変化パターンで変化させた状態での前記電気的特性値の変化パターンであり、
前記第2変化パターンは、標準ガスに暴露された前記感応部の温度を前記温度変化パターンで変化させた状態での前記電気的特性値の変化パターンである、
請求項1に記載の空気質判定方法。 - 前記感応部は、互いに感応特性が異なる複数の感応素子を含み、
前記判定ステップでは、前記試料ガスに暴露された前記複数の感応素子の温度を前記温度変化パターンで変化させた状態での前記複数の感応素子の前記電気的特性値の変化パターンに基づいて、前記試料ガスの前記空気質の状態を判定する、
請求項1又は2に記載の空気質判定方法。 - 前記感応部は、-20℃以上かつ50℃以下の温度領域で負の抵抗係数を有する負特性感応素子を含む、
請求項1~3のいずれか1項に記載の空気質判定方法。 - 前記温度制御ステップでは、-20℃以上かつ20℃以下の温度範囲内で、前記負特性感応素子の温度を上昇させる昇温期間と、前記負特性感応素子の温度を降下させる降温期間と、を含む前記温度変化パターンで、前記負特性感応素子の温度を変化させる、
請求項4に記載の空気質判定方法。 - 前記負特性感応素子は、有機組成物及び前記有機組成物の中に分散された導電粒子を有し、
前記負特性感応素子が有する前記有機組成物は、主鎖にシロキサンを有し、側鎖にメチル基を有する、
請求項4又は5に記載の空気質判定方法。 - 前記感応部は、-20℃以上かつ50℃以下の温度領域で正の抵抗係数を有する正特性感応素子を含む、
請求項1~6のいずれか1項に記載の空気質判定方法。 - 前記温度制御ステップでは、20℃以上かつ50℃以下の温度範囲内で、前記正特性感応素子の温度を上昇させる昇温期間と、前記正特性感応素子の温度を降下させる降温期間と、を含む前記温度変化パターンで、前記正特性感応素子の温度を変化させる、
請求項7に記載の空気質判定方法。 - 前記正特性感応素子は、有機組成物及び前記有機組成物の中に分散された導電粒子を有し、
前記正特性感応素子は、
主鎖にシロキサンを有し、側鎖にメチル基を含まず、側鎖にポリエチレングリコール基を有する前記有機組成物を有する第1の感応素子と、
主鎖にポリエチレングリコールを有し、側鎖にメチル基を含まず、側鎖にニトロ基を有する前記有機組成物を有する第2の感応素子と、
主鎖にシロキサンを有し、側鎖にメチル基を含まず、側鎖にシアノプロピル基を有する前記有機組成物を有する第3の感応素子と、
主鎖にシロキサンを有し、側鎖にメチル基を含まず、側鎖にシアノアリル基を有する前記有機組成物を有する第4の感応素子と、の少なくとも1つを含む、
請求項7又は8に記載の空気質判定方法。 - 前記温度制御ステップでは、前記感応部の加熱と冷却の少なくとも一方を行う温度制御素子を制御することによって、前記感応部の温度を制御し、
前記温度制御素子は、ペルチェ素子及び電熱素子の少なくとも一方を含む、
請求項1~9のいずれか1項に記載の空気質判定方法。 - 前記取得ステップでは、ネットワークを介して前記感応部の前記電気的特性値を取得する、
請求項1~10のいずれか1項に記載の空気質判定方法。 - 1又は複数種類の分子に反応して電気的特性値が変化する感応部を用いる空気質判定方法であって、
前記感応部は複数の感応モジュールを含み、
所定の測定期間において、試料ガスに暴露された前記複数の感応モジュールの温度を、前記複数の感応モジュールの各々において、温度が上昇する昇温期間と温度が降下する降温期間とを少なくとも1回ずつ含む温度変化パターンで変化するように制御する温度制御ステップと、
前記試料ガスに暴露された前記複数の感応モジュールの各々の前記電気的特性値を取得する取得ステップと、
前記試料ガスの空気質の状態を判定するための学習済みモデルを用い、前記複数の感応モジュールの各々の前記電気的特性値の変化に基づいて、前記試料ガスの前記空気質の状態の判定を行う判定ステップと、
前記判定ステップの判定結果を出力する出力ステップと、を含む、
空気質判定方法。 - 前記複数の感応モジュールの各々は、互いに感度特性が異なる複数の感応素子と、前記複数の感応素子が形成された基板と、を有し、
前記複数の感応モジュールが有する複数の前記基板が別々の基板である、
請求項12に記載の空気質判定方法。 - 前記複数の感応モジュールがそれぞれ有する前記複数の感応素子の組み合わせが、前記複数の感応モジュールで同じである、
請求項13に記載の空気質判定方法。 - 前記複数の感応モジュールがそれぞれ有する前記複数の感応素子の組み合わせが、前記複数の感応モジュールで互いに異なる、
請求項13に記載の空気質判定方法。 - 前記複数の感応モジュールの各々は、互いに感度特性が異なる複数の感応素子を有し、
前記複数の感応モジュールがそれぞれ有する前記複数の感応素子が1つの基板上に形成されている、
請求項12に記載の空気質判定方法。 - 前記複数の感応モジュールは第1の感応モジュールと第2の感応モジュールとを少なくとも含み、
前記温度制御ステップにおいて、前記第1の感応モジュールの前記昇温期間及び前記降温期間の少なくとも一方を、前記第2の感応モジュールと時間的にずらしている、
請求項12~16のいずれか1項に記載の空気質判定方法。 - 1又は複数種類の分子に反応して電気的特性値が変化する感応部と、
所定の測定期間に前記感応部を試料ガスに暴露させる暴露部と、
前記感応部の加熱と冷却の少なくとも一方を行う温度制御素子と、
前記所定の測定期間において、試料ガスに暴露された前記感応部の温度が、前記感応部の温度が上昇する昇温期間と前記感応部の温度が降下する降温期間とを少なくとも1回ずつ含む温度変化パターンで変化するように、前記温度制御素子を制御する制御部と、
前記所定の測定期間における前記感応部の前記電気的特性値を取得する取得部と、
前記試料ガスの空気質の状態を判定するための学習済みモデルを用い、前記電気的特性値の変化に基づいて、前記試料ガスの前記空気質の状態の判定を行う判定部と、
前記判定部の判定結果を出力する出力部と、を備える、
空気質判定システム。 - 1又は複数種類の分子に反応して電気的特性値がそれぞれ変化する複数の感応モジュールと、
所定の測定期間に前記複数の感応モジュールを試料ガスに暴露させる暴露部と、
前記複数の感応モジュールの加熱と冷却の少なくとも一方を行う温度制御素子と、
前記所定の測定期間において、試料ガスに暴露された前記複数の感応モジュールの各々の温度が、温度が上昇する昇温期間と温度が降下する降温期間とを少なくとも1回ずつ含む温度変化パターンで変化するように、前記温度制御素子を制御する制御部と、
前記所定の測定期間における前記複数の感応モジュールの前記電気的特性値を取得する取得部と、
前記試料ガスの空気質の状態を判定するための学習済みモデルを用い、前記複数の感応モジュールの前記電気的特性値の変化に基づいて、前記試料ガスの前記空気質の状態の判定を行う判定部と、
前記判定部の判定結果を出力する出力部と、を備える、
空気質判定システム。 - 1又は複数種類の分子に反応して電気的特性値が変化する感応部と、
前記感応部の加温と冷却の少なくとも一方を行う温度制御素子と、を有し、
前記温度制御素子は、所定の測定期間において、試料ガスに暴露された前記感応部の温度が、前記感応部の温度が上昇する昇温期間と前記感応部の温度が降下する降温期間とを少なくとも1回ずつ含む温度変化パターンで変化するように前記感応部の温度を変化させる、
センサモジュール。
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WO2024090156A1 (ja) * | 2022-10-28 | 2024-05-02 | パナソニックIpマネジメント株式会社 | 匂い識別方法及び匂い識別システム |
CN115901864A (zh) * | 2022-11-23 | 2023-04-04 | 南京邮电大学 | 一种阵列式多温区的气体传感器及其制备方法 |
CN115901864B (zh) * | 2022-11-23 | 2024-01-19 | 南京邮电大学 | 一种阵列式多温区的气体传感器及其制备方法 |
WO2024116772A1 (ja) * | 2022-11-29 | 2024-06-06 | パナソニックIpマネジメント株式会社 | 呼気検出方法、プログラム、及びセンサモジュール |
WO2024181032A1 (ja) * | 2023-02-27 | 2024-09-06 | パナソニックIpマネジメント株式会社 | ガス分析システム及びガス分析方法 |
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