WO2023042559A1 - におい測定装置、脱離処理装置及びにおい測定方法 - Google Patents

におい測定装置、脱離処理装置及びにおい測定方法 Download PDF

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Publication number
WO2023042559A1
WO2023042559A1 PCT/JP2022/029585 JP2022029585W WO2023042559A1 WO 2023042559 A1 WO2023042559 A1 WO 2023042559A1 JP 2022029585 W JP2022029585 W JP 2022029585W WO 2023042559 A1 WO2023042559 A1 WO 2023042559A1
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Prior art keywords
odor
processing chamber
sensor
measuring device
gas
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English (en)
French (fr)
Japanese (ja)
Inventor
順二 尾下
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Taiyo Yuden Co Ltd
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Taiyo Yuden Co Ltd
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Priority to JP2023548155A priority Critical patent/JPWO2023042559A1/ja
Publication of WO2023042559A1 publication Critical patent/WO2023042559A1/ja
Priority to US18/598,421 priority patent/US20240210355A1/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/022—Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/021—Gases

Definitions

  • the present invention relates to an odor measuring device, a desorption processing device, and an odor measuring method for measuring odor.
  • Some odor measuring devices using odor sensors use QCM (quartz crystal microbalance) or the like.
  • QCM quartz crystal microbalance
  • Patent Document 1 For example, in Patent Document 1, a predetermined amount of a gas sample is passed through an odor component collector, and a dry inert gas is fed to the odor component collector at high speed, thereby removing the gas sample from the odor component collector. A detachable odor measurement method is disclosed. Further, in Patent Document 2, a sampling gas is passed through an adsorption/desorption part to adsorb an odor component, and then an odorless gas is passed through the adsorption/desorption part to sense the odorless gas with the odor component adsorbed thereon. A detection method is disclosed.
  • Patent Document 3 a concentration distribution measuring device comprising a measurement chamber containing a gas sensor, an intake port connected to the measurement chamber, and an information acquisition unit for acquiring information including the position and direction of the intake port is used, An odor measurement method is disclosed that detects the direction of gas arrival based on the direction of the air intake. Furthermore, in Patent Document 4, an odor identification system is provided between a sample storage chamber and an odor measurement chamber and includes an odor selection element that selects odors using a molecular size filter or a polar filter to select and detect odors. A method for odor identification is disclosed.
  • Patent Documents 1 to 4 when the odor to be measured is of low concentration, detection is not easy due to insufficient sensitivity and the influence of disturbance.
  • concentration for detecting low concentrations but do not describe means for stably measuring low concentrations.
  • an object of the present invention is to provide an odor measuring device, a desorption treatment device, and an odor measuring method suitable for measuring low-concentration odors.
  • an odor measuring device includes a sensor chamber, a processing chamber, a first channel, a second channel, a supply section, and a measurement section.
  • the sensor chamber houses a sensor that detects an odorant, and has a first inlet and a first outlet.
  • the processing chamber accommodates the object to be measured, and has a second inlet and a second outlet.
  • the first flow path connects the first discharge port and the second suction port.
  • the second flow path connects the second outlet and the first inlet.
  • the supply section circulates gas between the sensor chamber and the processing chamber via the first flow path and the second flow path.
  • the measurement unit acquires a detection value from the sensor and measures the odor based on the detection value.
  • an odor measuring device includes a sensor chamber, a processing chamber, a channel, a supply section, and a measurement section.
  • the sensor chamber houses a sensor that detects an odorant, and has a first inlet and a first outlet.
  • the processing chamber includes a desorption processing chamber provided with a second discharge port and accommodating the measurement object, and a gas processing chamber provided with a second suction port and communicating with the desorption processing chamber through an opening.
  • the desorption processing chamber has a lower surface provided with the opening and an upper surface facing the lower surface, protrudes from the upper surface toward the lower surface, and supports the measurement object together with the lower surface.
  • a presser foot is provided.
  • the flow path connects the second outlet and the first inlet.
  • the supply unit supplies the gas in the processing chamber to the sensor chamber through the flow path.
  • the measurement unit acquires a detection value from the sensor and measures the odor based on the detection value.
  • an odor measuring device includes a sensor chamber, a processing chamber, a flow path, a supply section, a measurement section, and a heating element.
  • the sensor chamber houses a sensor that detects an odorant, and has a first inlet and a first outlet.
  • the processing chamber accommodates the object to be measured, and has a second inlet and a second outlet.
  • the flow path connects the second outlet and the first inlet.
  • the supply unit supplies the gas in the processing chamber to the sensor chamber through the flow path.
  • the measurement unit acquires a detection value from the sensor and measures the odor based on the detection value.
  • the heating body heats the object to be measured.
  • an odor measuring method includes a sensor chamber containing a sensor for detecting an odorant and having a first inlet and a first outlet; and a second inlet.
  • a processing chamber having a second outlet; a first flow path connecting the first outlet and the second inlet; and a second flow path connecting the second outlet and the first inlet.
  • a sensor module comprising a supply unit for circulating gas between the sensor chamber and the processing chamber via the first flow path and the second flow path, wherein the processing chamber contains an object to be measured; part, circulates gas between the sensor chamber and the processing chamber, and measures the odor based on the detected value obtained from the sensor.
  • a desorption treatment apparatus includes a desorption treatment chamber, a plurality of openings, a plurality of wall-shaped bodies, and a discharge port.
  • the desorption processing chamber has a space formed by the upper surface, the lower surface, and the side surface connecting the upper surface and the lower surface, and a sheet-like body such as cloth can be placed on the lower surface.
  • the plurality of openings are provided on the lower surface of the desorption processing chamber and covered with the sheet-like body.
  • the plurality of wall-shaped bodies are provided from the upper surface to the lower surface and press the sheet-shaped body.
  • the discharge port transports the gas that has passed through the opening and the sheet-like body to the outside.
  • a desorption treatment apparatus includes a desorption treatment chamber, an opening, a plurality of wall-like bodies, and a discharge port.
  • the desorption processing chamber has a space formed by the upper surface, the lower surface, and the side surface connecting the upper surface and the lower surface, and a sheet-like body such as cloth can be placed on the lower surface.
  • the opening is provided on the lower surface of the desorption processing chamber and has a slit shape extending in parallel with a plurality of openings covered with the sheet-like body.
  • the plurality of wall-shaped bodies are provided from the upper surface to the lower surface, hold down the sheet-shaped body, and intersect with the opening.
  • the discharge port transports the gas that has passed through the opening and the sheet-like body to the outside.
  • a desorption treatment apparatus includes a desorption treatment chamber, an opening, a plurality of wall-like bodies, a heating body, and a discharge port.
  • the desorption processing chamber has a space formed by the upper surface, the lower surface, and the side surface connecting the upper surface and the lower surface, and a sheet-like body such as cloth can be placed on the lower surface.
  • the opening is provided on the lower surface of the desorption processing chamber and has a slit shape extending in parallel with a plurality of openings covered with the sheet-like body.
  • the plurality of wall-shaped bodies are provided from the upper surface to the lower surface, hold down the sheet-shaped body, and intersect with the opening.
  • the heating element is in the form of a sheet provided on the back side of the opening or on the front side of the opening.
  • the discharge port transports the gas that has passed through the opening and the sheet-like body to the outside.
  • an odor measuring device As described above, according to the present invention, it is possible to provide an odor measuring device, a desorption processing device, and an odor measuring method suitable for measuring low-concentration odors.
  • FIG. 1 is a perspective view of an odor measuring device according to an embodiment of the present invention
  • FIG. Fig. 3 is a perspective view showing a state in which the lid of the odor measuring device is opened
  • Fig. 2 is a perspective view showing the internal structure of the odor measuring device
  • It is a schematic diagram which shows the structure of the said odor measuring apparatus.
  • It is a schematic diagram of the processing chamber with which the said odor measuring apparatus is equipped.
  • FIG. 2 is a schematic diagram of an open state of a processing chamber included in the odor measuring device
  • 4 is a timing chart showing the operating state of the odor measuring device
  • It is a schematic diagram which shows the measurement flow of the said odor measuring apparatus.
  • It is a schematic diagram which shows the cleaning flow of the said odor measuring apparatus.
  • FIG. 4 is a graph showing detection values of an odor sensor included in the odor measuring device.
  • 4 is a graph showing detected values of an odor sensor included in the odor measuring device and an odor sensor included in an odor measuring device according to a comparative example.
  • 1 is a perspective view of an odor measuring device provided with a pressing section according to an embodiment of the present invention;
  • FIG. 2 is a plan view of a processing chamber included in the odor measuring device;
  • 1 is a perspective view of an odor measuring device provided with a pressing portion and a side wall portion according to an embodiment of the present invention;
  • FIG. 2 is a plan view of a processing chamber included in the odor measuring device; 1 is a schematic diagram of a processing chamber of an odor measuring device equipped with a heating body according to an embodiment of the present invention; FIG. FIG. 5 is a schematic diagram showing another arrangement of heating elements in the processing chamber of the odor measuring device.
  • FIG. 5 is a schematic diagram showing another arrangement of heating elements in the processing chamber of the odor measuring device.
  • FIG. 5 is a schematic diagram showing another arrangement of heating elements in the processing chamber of the odor measuring device.
  • FIG. 5 is a schematic diagram showing another arrangement of heating elements in the processing chamber of the odor measuring device.
  • FIG. 2 is a schematic diagram showing a processing chamber containing a liquid measurement object of the odor measuring device according to the embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an odor measuring device according to a modification of the present invention
  • FIG. 4 is a schematic diagram of an odor measuring device according to a modification of the present invention
  • FIG. 10 is a schematic diagram of a processing chamber included in an odor measuring device according to a modification of the present invention
  • odor refers to an aggregate of multiple types of odorous substances.
  • examples of odorants include molecules such as acetone and toluene. Since the adsorption film of each odor sensor, which will be described later, has selectivity for the odor substances to be adsorbed, different types of odors are adsorbed on the adsorption film of each odor sensor. In other words, the adsorption film of each odor sensor differs in the composition and amount of the multiple types of odor substances that it adsorbs.
  • the type of odor which is an aggregate of each odor substance, is determined.
  • the types of odors include fruit odors, body odors, burnt odors caused by broken power cords, and addictive drug odors prohibited by law. The details will be described below.
  • FIGS. 1 and 2 are perspective views of an odor measuring device 100 according to the present embodiment
  • FIG. 3 is a perspective view of a partial configuration of the odor measuring device 100.
  • the odor measuring device 100 includes a housing 101 and a lid 102.
  • the housing 101 is constructed by joining an upper housing 103 and a lower housing 104 .
  • the lid 102 is configured to be openable and closable with respect to the housing 101 as shown in FIG. Lid 102 is connected to upper housing 103 .
  • the upper housing 103 has a rectangular upper surface, four side surfaces extending downward from four sides of the upper surface, and a rectangular lower surface connected to the four side surfaces at positions facing the upper surface.
  • the shape of the upper housing 103 is not limited to such a cubic shape, and may be any shape that can accommodate an object to be measured, which will be described later.
  • An opening is provided on the upper surface for taking in and out the object to be measured, and a lid 102 is arranged so as to cover this opening.
  • one side of the lid 102 is attached around the opening so that it can be opened and closed, but the lid 102 may be a cap and may be removable.
  • the upper housing 103 itself may be removable. Then, the lid 102 is opened, and the object to be measured is placed in the lower housing 104 side.
  • FIG. 3 is a perspective view of the lower housing 104 with the illustration of the upper housing 103 and lid 102 omitted.
  • FIG. 4 is a schematic diagram showing the configuration of the odor measuring device 100.
  • the odor measuring device 100 includes a sensor chamber 111, a sensor module 112 installed in the sensor chamber 111, a processing chamber 113, a first channel 114, a second channel 115, a filter 116, a second It has three channels 117 , a fourth channel 118 , a first supply section 119 , a second supply section 120 , a control section 121 and a measurement section 122 .
  • the sensor chamber 111 is a processing chamber in which a sensor module 112 is housed and a gaseous fluid containing an odor is supplied from the processing chamber 113 to detect the odor.
  • the sensor chamber 111 has a first inlet 111a, a third inlet 111b and a first outlet 111c.
  • the sensor module 112 has an odor sensor 123 and a humidity sensor 124 .
  • Sensor module 112 may further include a temperature sensor.
  • the number of odor sensors 123 provided in the sensor module 112 is preferably plural, and 12 odor sensors 123 are provided in this embodiment.
  • the odor sensor 123 outputs a detection value corresponding to the amount of odor substances adsorbed.
  • the odor sensor 123 is, for example, a QCM (Quartz Crystal Microbalance) sensor, and includes a vibrator and an adsorption film covering the surface of the vibrator.
  • a vibrator vibrates at a constant resonance frequency when a voltage is applied. This resonance frequency is, for example, 9 MHz.
  • the adsorption film is provided on the vibrator and adsorbs a specific odor substance. When the vibrator is vibrated at a constant resonance frequency, if an odorous substance is adsorbed on the adsorption film, the weight of the adsorption film increases and the resonance frequency of the vibrator decreases.
  • the odor sensor 123 outputs the fluctuation amount of this resonance frequency to the measuring section as a detection value.
  • the odor sensor is a polymer or ceramic resistive sensor, a capacitive sensor in which the dielectric is sandwiched between two electrodes, the dielectric constant of which is changed by adsorption, and the QCM of this embodiment.
  • a vibration type sensor such as FBAR (Film Bulk Acoustic Resonator) or SAW (Surface Acoustic Wave) may be used.
  • the adsorption film is made of a different material for each odor sensor 123 .
  • the odor contained in the gas to be measured contains one or more odorous substances.
  • the material used for the adsorption film is appropriately selected according to the type of odor to be measured.
  • the adsorption film includes cellulose, fluorine-based polymer, lecithin, phthalocyanine compound, porphyrin compound, polyimide, polypyrrole, polystyrene, acrylic polymer, sphingomyelin, polybutadiene, polyisoprene, polyvinyl alcohol polymer, UiO-66, Metal-organic frameworks (MOFs) such as MIL-125, ZIF-8 can be used.
  • the adsorption film may have any one of these materials, or may have a combination of two or more materials.
  • Humidity sensor 124 detects the relative humidity of the gas within sensor chamber 111 .
  • a known humidity sensor such as a capacitance type whose capacitance changes in response to moisture or a resistance change type whose electrical resistance changes in response to moisture can be used.
  • the humidity sensor 124 may be one of the odor sensors 123 formed with a hydrophilic adsorption film.
  • Humidity sensor 124 outputs the detected relative humidity to the measurement unit.
  • a known temperature sensor such as a thermistor can be used as the temperature sensor.
  • the processing chamber 113 accommodates an object to be measured, and has a second inlet 113a and a second outlet 113b as shown in FIG.
  • FIG. 5 is a schematic diagram showing the processing chamber 113.
  • the processing chamber 113 is composed of two chambers, a desorption processing chamber 131 and a gas processing chamber 132 .
  • the lower surface 131a of the desorption processing chamber 131 is shared with the upper surface 132a of the gas processing chamber 132, and the two are integrated, and the shared plate is provided with an opening 113c.
  • the desorption processing chamber 131 is configured to be openable and closable.
  • FIG. 6 is a schematic diagram showing opening and closing of the desorption processing chamber 131. As shown in FIG. As shown in FIGS. 6 and 2, the desorption processing chamber 131 can be opened and closed by a lid 102 and can accommodate the object to be measured. In FIG. 4, the measurement object accommodated in the processing chamber 113 is indicated as the measurement object P. As shown in FIG.
  • the object P to be measured is not particularly limited, but is, for example, a sheet-like body such as a mask or cloth. The area around the mouth and the surface of the bag to which the odorant adheres are wiped off with a cloth, and the cloth is put into the desorption processing chamber 131 .
  • the object P to be measured may have an odorous substance attached to it, or may be a source of odorous substances, such as food such as fruits and vegetables.
  • the object P to be measured is not limited to a solid object, and may be a liquid drink such as juice containing fruit components. In the case of a liquid object, it is desirable to use a dish 161 shown in FIG. 23 or store the liquid object in a container with a hole in the lid so that volatile gas can be emitted.
  • the desorption processing chamber 131 has the second discharge port 113b. Further, as shown in FIG. 5, the desorption processing chamber 131 has a lower surface 131a, an upper surface 131b and a side surface 131c.
  • the lower surface 131a is a surface on which the measurement object P is placed, and the upper surface 131b is a surface facing the lower surface 131a.
  • the side surface 131c connects the lower surface 131a and the upper surface 131b, and the upper surface 131b, the lower surface 131a, and the side surface 131c form a space.
  • the desorption processing chamber and various components provided in the desorption processing chamber are collectively referred to as a "desorption processing apparatus".
  • the gas processing chamber 132 is a chamber adjacent to the desorption processing chamber 131 .
  • the gas processing chamber 132 has the second inlet 113a.
  • the desorption processing chamber 131 has an upper surface 132a, a lower surface 132b and a side surface 132c.
  • the upper surface 132a is the back surface of the lower surface 131a of the desorption processing chamber 131, and the lower surface 132b is the surface facing the upper surface 132a.
  • the side surface 132c connects the lower surface 132b and the upper surface 132a, and the upper surface 132a, the lower surface 132b, and the side surface 132c form a space.
  • An opening 113 c is provided between the lower surface 131 a of the desorption processing chamber 131 and the upper surface 132 a of the gas processing chamber 132 .
  • the desorption processing chamber 131 and the gas processing chamber 132 communicate with each other through this opening 113c.
  • the opening 113c is, for example, a plurality of slit-like openings 113c extending in parallel as shown in FIG.
  • the number of openings 113c is not particularly limited.
  • the first flow path 114 connects the first outlet 111c of the sensor chamber 111 and the second inlet 113a of the processing chamber 113, as shown in FIG.
  • the second flow path 115 connects the second outlet 113b of the processing chamber 113 and the first inlet 111a of the sensor chamber 111, as shown in FIG.
  • the first flow path 114 may be connected to the third flow path 117 as shown in FIG. 4, or may be an independent flow path that is not connected to the third flow path 117 .
  • the filter 116 removes odor substances and moisture (such as water vapor) from the gas in the sensor chamber 111 by passing through the filter 116 .
  • the third flow path 117 connects the first outlet 111c of the sensor chamber 111 and the filter 116, as shown in FIG.
  • the fourth flow path 118 connects the filter 116 and the third suction port 11b of the sensor chamber 111, as shown in FIG.
  • the first supply unit 119 circulates the gas between the sensor chamber 111 and the processing chamber 113 via the first channel 114 and the second channel 115 .
  • the first supply unit 119 is a mechanism capable of sending gas using a pump, fan, or the like, and is arranged in the sensor chamber 111 near the first suction port 111a. Also, the first supply unit 119 may be provided in the middle of the second flow path 115 .
  • the second supply unit 120 circulates the gas between the sensor chamber 111 and the filter 116 via the third channel 117 and the fourth channel 118 .
  • the second supply unit 120 is a mechanism capable of sending gas using a pump, fan, or the like, and is arranged in the sensor chamber 111 near the third suction port 111b. Also, the second supply section 120 may be provided in the middle of the fourth flow path 118 .
  • the control unit 121 is connected to the sensor module 112, the first supply unit 119 and the second supply unit 120 and controls them.
  • a heater 151 shown in FIGS. 19 and 20 can also be controlled.
  • the heating element 151 may be a Peltier element.
  • the control unit 121 causes the oscillator of each odor sensor 123 to vibrate at a predetermined resonance frequency, and acquires the amount of change in the resonance frequency from each odor sensor 123 as a detection value.
  • the control unit 121 transmits the acquired detection value of each odor sensor 123 to the measurement unit 122 .
  • the control section 121 controls the first supply section 119 and the second supply section 120 to switch the operating state of the odor measuring device 100 . This operating state will be described later.
  • the measurement unit 122 acquires the detection value of each odor sensor 123, and when the change in the detection value falls within a predetermined amount in a predetermined time, for example, when the detection value stabilizes, the measurement unit 122 determines the odor based on the detection value. .
  • the measurement unit 122 can measure each odor substance from the detection value of each odor sensor 123 and specify the amount of each odor substance desorbed from the measurement object P. In addition, the measurement unit 122 can determine the type and strength of the odor released from the measurement object P using the amount of each identified odorant and the databased reference information.
  • FIG. 7 is a timing chart showing the operating state of the odor measuring device 100
  • FIGS. 8 and 9 are schematic diagrams showing the operation of the odor measuring device 100.
  • the odor measurement device 110 is in two states, a "measurement state” and a "cleaning state.”
  • the control section 121 drives the first supply section 119 and stops driving the second supply section 120 .
  • gas flows from the sensor chamber 111 into the first channel 114 via the first discharge port 111c, and flows from the first channel 114 into the second suction port 113a, as indicated by arrows in FIG. flows into the gas treatment chamber 132 via the .
  • the gas flows into the desorption processing chamber 131 through the opening 113c and passes through the object P to be measured.
  • the gas flows from the desorption processing chamber 131 into the second channel 115 through the second outlet 113b.
  • the gas flows into the sensor chamber 111 from the second flow path 115 through the first suction port 111a.
  • the gas again flows from the sensor chamber 111 into the first channel 114 via the first outlet 111c, and thereafter repeats the flow described above. That is, gas circulates between the sensor chamber 111 and the processing chamber 113 via the first channel 114 and the second channel 115 in the measurement state.
  • this gas flow will be referred to as "measurement flow”.
  • the measurement object P is a sheet-like body such as cloth, mask, handkerchief, or absorbent cotton, and covers the lower surface 131a including the opening 113c. Therefore, the gas is forced to pass through the object P to be measured.
  • the odor component contained in the object P to be measured is a very small amount, the number of times of circulation in FIG. and less.
  • the control section 121 stops driving the first supply section 119 and drives the second supply section 120 .
  • the gas flows from the sensor chamber 111 through the first discharge port 111c into the third channel 117 and then into the filter 116 from the third channel 117, as indicated by arrows in FIG. .
  • the gas passes through the filter 116, flows into the fourth channel 118, and flows into the sensor chamber 111 through the third suction port 111b.
  • the gas again flows from the sensor chamber 111 into the third channel 117 via the first outlet 111c, and thereafter repeats the flow described above. That is, in the cleaning state, gas circulates between the sensor chamber 111 and the filter 116 via the third channel 117 and the fourth channel 118 .
  • this gas flow will be referred to as "cleaning flow”.
  • FIG. 10 is a schematic diagram showing an odor measurement process by the odor measurement device 100.
  • the odor measurement process includes a cleaning step St101, a measurement step St102 and a cleaning step St103.
  • the odor measuring apparatus 100 is placed in the cleaning state described above, and a cleaning flow as indicated by arrows in FIG. 9 is generated.
  • the odor substances and moisture adhering to the adsorption film of the odor sensor 123 desorb into the gas, are adsorbed (trapped) by the filter 116, and are removed.
  • S1 is, for example, 20 minutes. The higher the number of times this flow circulates, the higher the degree of cleaning. Note that the arrow in FIG. 9, that is, the direction of circulation may be reversed.
  • the odor measurement apparatus 100 is brought into the measurement state described above, and the measurement flow is generated. Odor substances adhering to the measurement object P are desorbed by the measurement flow passing through the measurement object P and transported to the sensor chamber 111 . The odorant transported to the sensor chamber 111 is adsorbed on the adsorption film of the odor sensor 123 . Odor sensor 123 outputs the detected value to measuring section 122 .
  • S2 is the period after the time T3, which will be described later. In other words, the measurement is made after T3 when the change has settled down.
  • the odor measuring device 100 is placed in the cleaning state described above, and the cleaning flow indicated by the arrow in FIG. 9 is generated.
  • the odor substances and moisture adhering to the adsorption film or the like of the odor sensor 123 desorb into the gas and are adsorbed by the filter 116, and the odor of the odor sensor 123 is removed.
  • S3 is, for example, 20 minutes.
  • the lid 102 is opened and the object P to be measured is taken out.
  • the next object P to be measured can be placed in the desorption processing chamber 131 and the odor can be measured in the same manner.
  • the odor measurement process by the odor measurement device 100 is performed as described above. Note that the desorption processing chamber 131 is detachable, and can be detached and cleaned after the measurement of the object P to be measured. Also, the above measurement process may be executed by the user using the odor measuring device 100 or by the control section 121 .
  • the measurement unit 122 acquires the detected value output from each odor sensor 123 as described above.
  • FIG. 11 is a graph showing the variation of the resonance frequency, which is the detection value output from one odor sensor 123.
  • the detected value increases from the start time T1 of the measurement step St102 and gradually stabilizes.
  • the measurement unit 122 specifies the time when the detected value is stabilized as the time T3. Specifically, the measurement unit 122 specifies the time when the change in the detected value is within a predetermined amount for a predetermined period of time as the time T3.
  • the predetermined time is, for example, 60 seconds, and the predetermined amount is, for example, 18 Hz.
  • the measurement unit 122 may specify the time when the change in the detected value per second is within a predetermined amount as time T3, for example, the time when the change in the detected value is within ⁇ 0.3 Hz/sec. can be identified as time T3.
  • time T3 the time when the change in the detected value is within ⁇ 0.3 Hz/sec.
  • Measurement unit 122 measures the odor based on the detected value at time T3.
  • the measurement unit 122 can specify the amount of the odor substance adsorbed to the adsorption film of the odor sensor 123 from the detection value of each odor sensor 123 at time T3. At this time, the measurement unit 122 may use a detected value corrected by humidity or temperature. In addition, the measurement unit 122 can determine the type and strength of the odor desorbed from the measurement object P by comparing the amount of each identified odorant with the information stored in the database.
  • the measurement unit 122 After specifying the time T3, the measurement unit 122 notifies the control unit 121 of the time T3.
  • the control unit 121 ends the measurement step St102 shown in FIG. 10 by setting the time after the time T3 to the time T2.
  • the control unit 121 may set the time T2 after a certain period of time has elapsed from the time T3, or may set the same time as the time T3 as the time T2.
  • the control unit 121 may set the time after a certain period of time from the time T1 as the time T2 regardless of the time T3.
  • the measuring unit 122 can also specify the time T3 after the end of the measurement St102 and measure the odor based on the detected value at the time T3.
  • the measurement unit 122 specifies the time T3 as the time when the change in the detected value is within a predetermined amount for a predetermined period of time, and also determines when the change in the detected value occurs when the measurement flow indicated by the arrows in FIG.
  • the time when the amount is within the fixed amount may be specified as time T3.
  • FIG. 12 is a graph showing the amount of resonance frequency variation, which is the detected value of the odor sensor 123 provided in the odor measurement apparatus 100, and the amount of resonance frequency variation of the odor sensor provided in the odor measurement apparatus according to the comparative example.
  • the amount of resonance frequency variation detected by the odor sensor 123 provided in the odor measuring device 100 is indicated as "Invention”
  • the amount of resonance frequency variation of the odor sensor provided in the odor measuring device according to the comparative example is indicated as "Comparative example”.
  • the odor measuring device has a structure in which outside air flows into a processing chamber containing an object to be measured, gas flows from the processing chamber into a sensor chamber containing an odor sensor, and is discharged from the sensor chamber to the outside. , it does not have a structure in which gas circulates between the processing chamber containing the object to be measured and the sensor chamber.
  • the resonance frequency fluctuation amount is large immediately after the start of measurement, and the resonance frequency fluctuation amount gradually decreases as the measurement time elapses. This is because the odorant transported to the odor sensor decreases as the detachment of the odorant from the object to be measured progresses, and the odorant adsorbed to the odorant sensor gradually desorbs. In this case, it is difficult to determine at what point in time the resonance frequency variation amount should be used to specify the amount of the odorant.
  • the maximum value of the resonance frequency fluctuation amount immediately after the start of measurement may also change due to the influence of temperature and the like. As described above, in the case of the odor measuring apparatus according to the comparative example, accurate odor measurement may not be possible. becomes difficult.
  • the amount of resonance frequency fluctuation increases as the measurement time elapses and then gradually stabilizes. This is because the gas circulates between the sensor chamber 111 and the processing chamber 113 in the measurement flow indicated by the arrows in FIG. 8 and is not discharged to the outside. This is because the concentration of the odorant in the circulation route becomes uniform. Therefore, the detection value of the odor sensor 123 is stabilized, and the odor identification accuracy is improved. In particular, even when the amount of odorant adhering to the object to be measured is small and the concentration of the odorant is low, the odorant is not emitted to the outside, so odor can be measured with high accuracy.
  • the present invention has a plurality of odor sensors 123, and compares the pattern of detection values of the plurality of odor sensors 123 with a trained model of machine learning in which the pattern of detection values and the type of odor correspond to each other.
  • This is suitable for determining the type and intensity of odor. This is because when determining the type and intensity of the odor, the type and intensity of the odor can be determined with high accuracy by matching with the learned model after the concentration of the odor contained in the gas has stabilized.
  • the use of the odor measuring device 100 is not particularly limited. can be measured. That is, it can be used as an intake type odor measuring device. As described above, the odor measuring device 100 is also suitable for low-concentration odor measurement, and can be suitably used for such applications. For example, when detecting a prohibited drug, even if it is present in an extremely small amount on a dishcloth, it can be detected by the odor sensor 123 if the circulation shown in FIG. 8 takes time. For prohibited substances, the presence or absence of this drug is more important than measuring the magnitude of the concentration. In the circulation shown in FIG. 8, the drug-containing gas passes through the sensitive membrane of the odor sensor 123 many times, so the detection capability of the odor sensor 123 is improved.
  • the odor measuring device 100 may have a pressing structure that presses the object P to be measured.
  • FIG. 13 is a perspective view of the odor measuring device 100 having the pressing structure
  • FIG. 14 is a schematic diagram of the processing chamber 113 of the odor measuring device 100 having the pressing structure.
  • the desorption processing chamber 131 may include a pressing portion 141 projecting from the upper surface 131b toward the lower surface 131a.
  • the holding portion 141 holds the measurement object P together with the lower surface 131a as shown in FIG.
  • the lower surface 131a is provided with the opening 113c as described above, and in the measurement flow indicated by the arrow in FIG.
  • the object P to be measured bends or floats, the air resistance in this space is small, so the gas does not pass through the object P to be measured and is discharged from the desorption processing chamber 131, causing an odor. It may become difficult for the substance to detach from the object P to be measured.
  • the measurement object P against the lower surface 131a with the pressing part 141 bending and floating of the measurement object P can be eliminated, and the odorant can be reliably desorbed from the measurement object P.
  • FIG. 15 is a plan view showing the shape of the holding portion 141.
  • the pressing portion 141 is a wall-like body (plate-like body) extending downward from the upper surface 131b, and extends in the X direction perpendicular to the extending direction of the opening 113c, which is the Y direction. It can have a shape extending in the direction. Due to this shape, the opening 113c and the pressing portion 141 are arranged in a grid pattern, and the object P to be measured can be reliably pressed. This is because if the extending direction of the opening 113c and the extending direction of the wall-like body match, the wall-like body or the measurement object may block the opening.
  • the desorption processing chamber 131 may further include side walls.
  • FIG. 16 is a perspective view of the odor measuring device 100 having the holding portion 141 and the side wall portion 142
  • FIG. FIG. 18 is a plan view showing the shapes of the pressing portion 141 and the side wall portion 142.
  • the side wall portion 142 has a wall shape that protrudes from the upper surface 131b toward the lower surface 131a and surrounds the pressing portion 141 on three sides. Due to this shape, the side wall portion 142 sandwiches the peripheral edge portion of the measurement object P together with the lower surface 131a, so that the entire measurement object P can be reliably held down.
  • the desorption processing chamber 131 may be provided with only the side wall portion 142 without the pressing portion 141 .
  • the odor measuring device 100 may be equipped with a heating body for heating the object to be measured.
  • FIG. 19 is a schematic diagram of the processing chamber 113 in which the heating element 151 is provided. As shown in the figure, the heater 151 is provided outside the gas processing chamber 132 on the rear surface of the lower surface 132b. By causing the heating element 151 to generate heat during the measurement flow shown in FIG. 8, the gas in the gas processing chamber 132 is heated. The separation can be accelerated, and the odorous substance adhering to the channel and the inner wall of the processing chamber 113 can be desorbed.
  • thermoelectric element 151 By arranging the heating element 151 below the object P to be measured, it is possible to generate an updraft indicated by the arrows in the drawing, and to apply the gas to the object P to be measured efficiently.
  • a sheet-like Peltier element may be employed as the heating element.
  • the arrangement of the heating element 151 is not limited to that described above.
  • 20 to 22 are schematic diagrams showing other arrangements of the heating element 151.
  • the heating element 151 may be arranged on the lower surface 132b inside the gas processing chamber 132.
  • the heating body 151 may be arranged on the lower surface 131a of the desorption processing chamber 131 around the opening 113c. In this configuration, the heating body 151 and the object P to be measured are close to each other, so the object P to be measured can be efficiently heated.
  • the heating element 151 may be arranged on the upper surface 132a of the gas processing chamber 132 around the opening 113c. If the heater is a sheet, a slit may be provided in the sheet and the slit and the opening 113c may be aligned.
  • the heating body 151 may be arranged on the entire inner wall of the desorption processing chamber 131 . With this configuration, it is possible to suppress adhesion of the odorant to the inner wall of the desorption processing chamber 131, which is particularly effective when the concentration of the odorant is low.
  • the heating element 151 can be arranged outside the desorption processing chamber 131 and the gas processing chamber 132 or in at least one of the chambers. It is also possible to arrange them respectively.
  • the odor measuring device 100 may be provided with the holding portion 141 and the side wall portion 142 as well as the heating body 151 .
  • the odor measuring device 100 can also measure the odor of a liquid object to be measured.
  • 23A and 23B are schematic diagrams showing a method for measuring a liquid measurement object P.
  • the liquid object P to be measured is placed in a dish 161 and placed in a case 162 .
  • the case 162 has an opening 162a that communicates with the opening 113c, and has a curved shape as indicated by the arrow in the figure for guiding the gas that flows in from the opening 162a to the object P to be measured.
  • the gas flowing from the opening 162a efficiently hits the measurement object P, and the vaporization of the measurement object P can be promoted.
  • FIG. 24 to 26 are schematic diagrams showing modifications of the odor measuring device 100.
  • the odor measuring device 100 may not have the filter 116, the third channel 117 and the fourth channel 118.
  • FIG. instead, the odor measuring device 100 has an opening for introducing the cleaning gas and an outlet for discharging the cleaning gas.
  • the cleaning gas an odorless gas may be introduced, or gas may be taken in from outside air and odor substances removed by a filter.
  • part or all of the holding portion 141, the side wall portion 142, and the heating body 151 can be provided.
  • the odor measuring device 100 may not have the first channel 114.
  • FIG. 8 the circulating measurement flow shown in FIG. 8 does not occur. , and is discharged from the first discharge port 111c.
  • the odor substance desorbed from the measurement object P is supplied to the odor sensor 123 by this measurement flow and measured.
  • part or all of the holding portion 141, the side wall portion 142, and the heating body 151 can be provided.
  • FIG. 16 is a schematic diagram showing the processing chamber 113 of the odor measuring device 100 according to the modification.
  • the processing chamber 113 may have only the desorption processing chamber 131 .
  • the gas does not pass through the object P to be measured, so the desorption speed of the odorant from the object P is low. This makes it possible to measure odor substances.
  • the heating element 151 can be provided inside or outside the desorption processing chamber 131 .

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JPH10111224A (ja) * 1996-08-09 1998-04-28 Mitsubishi Electric Corp におい測定装置
JPH1183820A (ja) * 1997-09-01 1999-03-26 Mitsubishi Electric Corp におい測定装置
JP2006064554A (ja) * 2004-08-27 2006-03-09 Futaba Electronics:Kk 匂い測定装置と匂い測定方法
JP2016186426A (ja) * 2015-03-27 2016-10-27 株式会社ユー・エス・イー におい識別システム
US20210033590A1 (en) * 2019-07-29 2021-02-04 Endress+Hauser Conducta GmbH+Co.KG Method for determining a chemical intake capacity of a process medium in a measuring point and measuring point for determining a chemical intake capacity of a process medium
WO2022085345A1 (ja) * 2020-10-23 2022-04-28 ソニーグループ株式会社 匂い検知モジュールおよび匂い検知方法
WO2022137438A1 (ja) * 2020-12-24 2022-06-30 太陽誘電株式会社 匂い検出装置及び匂い検出方法

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DE202015002315U1 (de) * 2015-03-27 2015-05-06 Infineon Technologies Ag Gassensor
EP3550286B2 (en) * 2019-04-17 2026-02-11 Sensirion AG Photoacoustic gas sensor device
EP3786616A1 (de) * 2019-08-29 2021-03-03 Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. Mems basierte photoakustische zelle
JP7541127B2 (ja) * 2022-04-28 2024-08-27 エーエーシーアコースティックテクノロジーズ（シンセン）カンパニーリミテッド ガスセンサ

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10111224A (ja) * 1996-08-09 1998-04-28 Mitsubishi Electric Corp におい測定装置
JPH1183820A (ja) * 1997-09-01 1999-03-26 Mitsubishi Electric Corp におい測定装置
JP2006064554A (ja) * 2004-08-27 2006-03-09 Futaba Electronics:Kk 匂い測定装置と匂い測定方法
JP2016186426A (ja) * 2015-03-27 2016-10-27 株式会社ユー・エス・イー におい識別システム
US20210033590A1 (en) * 2019-07-29 2021-02-04 Endress+Hauser Conducta GmbH+Co.KG Method for determining a chemical intake capacity of a process medium in a measuring point and measuring point for determining a chemical intake capacity of a process medium
WO2022085345A1 (ja) * 2020-10-23 2022-04-28 ソニーグループ株式会社 匂い検知モジュールおよび匂い検知方法
WO2022137438A1 (ja) * 2020-12-24 2022-06-30 太陽誘電株式会社 匂い検出装置及び匂い検出方法

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