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WO2018108646A1 - Détection de polluants aériens sans ventilateur - Google Patents

Détection de polluants aériens sans ventilateur Download PDF

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Publication number
WO2018108646A1
WO2018108646A1 PCT/EP2017/081604 EP2017081604W WO2018108646A1 WO 2018108646 A1 WO2018108646 A1 WO 2018108646A1 EP 2017081604 W EP2017081604 W EP 2017081604W WO 2018108646 A1 WO2018108646 A1 WO 2018108646A1
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WO
WIPO (PCT)
Prior art keywords
sensor
airborne pollutant
concentration
flow channel
sensor device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2017/081604
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English (en)
Inventor
Peng Zhang
Weizhong Chen
Jun Shi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EP17163753.1A external-priority patent/EP3382367A1/fr
Application filed by Koninklijke Philips NV filed Critical Koninklijke Philips NV
Publication of WO2018108646A1 publication Critical patent/WO2018108646A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2273—Atmospheric sampling
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/075—Investigating concentration of particle suspensions by optical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2273—Atmospheric sampling
    • G01N2001/2276—Personal monitors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N2015/0042—Investigating dispersion of solids
    • G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke

Definitions

  • the present invention relates to a sensor device for determining a concentration of an airborne pollutant, comprising a flow channel having an inlet and an outlet, with an airborne pollutant sensor in the flow channel.
  • the present invention further relates to a method of determining an airborne pollutant concentration with such a sensor device.
  • Most airborne pollutant sensor devices such as particle sensors use a light scattering principle to measure the particle concentration.
  • Light scattering can be induced when particles go through a sensing area of the particle sensor device, where the scattered light is detected and transformed into electrical signals, which may be amplified and processed.
  • the number and diameter of particles can be obtained by analysis of such electrical signals due to the fact that the number of the signals can be correlated to the number of the particles in the sensing area, with the signal waveform containing information regarding the particle's diameter.
  • LED based sensor As for example disclosed in JP2008145353A and
  • CN 104089858 A Another known principle is a laser-based sensor, for example, a laser-based PM2.5 detector used to detect atmospheric particles having a size (diameter) of less than 2.5 ⁇ , as for example disclosed in CN203551443U, CN203824872U and CN105021501A.
  • the basic principle of such a laser-based PM2.5 detector is that the laser scattering by the particles may be detected with an optical sensor arranged to produce a pulse signal output, which may be converted into a digital signal.
  • the airflow through such a sensor is typically generated by a resistor, fan, pump or the like.
  • the airflow speed through the particle sensor device can be accurately controlled, as required for an accurate determination of the particle concentration per unit volume of air.
  • such components are relatively costly, which creates undesired upward pressure on the manufacturing cost of such particle sensor devices, in particular where such particle sensor devices are to be deployed in a competitive, small margin, technical field, e.g. electronic devices such as consumer electronic devices.
  • such components increase the size of the particle sensor device as well as increase the power consumption of the particle sensor device, which may be undesirable in certain application domains, e.g. wearable devices.
  • such components generate heat when in use, which may cause temperature fluctuations and associated measurement error in the particle sensor device.
  • US 2016/0025628 Al discloses a mobile device which senses particulate matter.
  • the mobile device includes a housing having an airflow path through which airflows when the mobile device is shaken; an inertia sensor that detects acceleration of the mobile device; a light-scattering type sensor that irradiates the airflow path with light and detects particulate matter in air flowing through the airflow path; and a controller that includes a counter for counting the particulate matter detected by the light-scattering type sensor, and a flow rate calculator for detecting an airflow rate of the airflow path based on a detection signal of the inertia sensor. In this manner, an airflow generating component can be avoided.
  • inertia sensors are typically affected by gravity, such that in order to obtain accurate air flow determinations, additional components, e.g. a gyroscope, may be required to estimate the effect of gravity on the inertia sensor such that its reading can be compensated accordingly.
  • additional components e.g. a gyroscope
  • EP2937680A discloses an instrument for measuring airborne constituents by drawing air into a common chamber and then out through separate outlet channels having filters of different areas and pumps. Optical detectors analyse the particles that accumulate in the filters, and the combination of measurement results from the two filters provides an overall output.
  • CN 105823714A discloses a wearable laser dust sensor that can be rocked to take measurements.
  • the present invention seeks to provide a compact fanless sensor device for accurately determining a concentration of an airborne pollutant.
  • the present invention further seeks to provide a method of accurately determining a concentration of an airborne pollutant with such a sensor device.
  • a portable sensor device for determining a concentration of an airborne pollutant, comprising a first flow channel having a first inlet from the exterior of the device and a first outlet to the exterior of the device; a first airborne pollutant sensor in the first flow channel; a second flow channel, separate from the first flow channel and having a second inlet from the exterior of the device and a second outlet to the exterior of the device; and a second airborne pollutant sensor in the second flow channel; wherein the first inlet has a first area and the second inlet has a second area, and wherein a ratio between the first area and the second area is larger than 1.5.
  • the present invention is based on the insight that a concentration of an airborne pollutant can be accurately determined using a pair of flow channels each comprising a sensor for the pollutant by giving the flow channels differently sized inlets, such that the airflow speed in the respective channels will be different.
  • the associated ratio between these airflow speeds in these flow channels may be used such that the actual concentration of the airborne pollutant can be determined from the respective sensor readings in these flow channels.
  • the ratio between the first area and the second area should be larger than 1.5, preferably larger than 2.25, more preferably larger than 3.
  • the sensor device does not have to contain a fan for regulating an airflow speed through the first flow channel or the second flow channel or flow speed measurement device such as an accelerometer or a flow meter for determining said airflow speed, as the airflow speed in the respective flow channels, which is required to determine the airborne pollutant concentration, can be deduced from the airflow speed-dependent ratio between the sensor readings provided by the first and second airborne pollutant sensors. Consequently, an accurate concentration of the airborne pollutant can be obtained by a user simply by shaking or otherwise moving the sensor device to generate an airflow therethrough.
  • the first outlet may have a first further area and the second outlet may have a second further area, wherein the ratio between the first area and the second area is the same as a further ratio between the first further area and the second further area in order to ensure the desired airflow speed ratios through the respective flow channels.
  • the first outlet preferably further has the same area as the first inlet.
  • the sensor device has a housing with a wall in which the first and second inlets are formed, the first and second channels being formed in the housing and being generally parallel. This makes the air flow velocity the same at both inlets and can make the flow speed at the detection zones predictable from the ratio of the areas of the inlets.
  • the sensor device is a self-contained or standalone device adapted to calculate the airborne pollutant concentration from the respective sensor readings of the first and second airborne pollutant sensors.
  • the sensor device may further comprise a processor communicatively coupled to the first airborne pollutant sensor and the second airborne pollutant sensor, the processor being arranged to determine a concentration of the airborne pollutant from a first sensor reading provided by the first airborne pollutant sensor and a second sensor reading provided by the second airborne pollutant sensor.
  • the processor may be arranged to determine the concentration of the airborne pollutant based on a preconfigured calibration function, which function for instance may be configured by empirically deriving its parameters using a calibrated sensor for the airborne pollutant to compare the concentration determined with the sensor device using an unconfigured version of the calibration function with the concentration determined with the calibrated sensor and defining the parameters of the calibration function based on the difference between these concentrations.
  • a preconfigured calibration function which function for instance may be configured by empirically deriving its parameters using a calibrated sensor for the airborne pollutant to compare the concentration determined with the sensor device using an unconfigured version of the calibration function with the concentration determined with the calibrated sensor and defining the parameters of the calibration function based on the difference between these concentrations.
  • the sensor device further comprises a communication module communicatively coupled to the processor and arranged to communicate the determined concentration of the airborne pollutant to an external device.
  • a communication module communicatively coupled to the processor and arranged to communicate the determined concentration of the airborne pollutant to an external device.
  • the external device e.g. a smart phone, tablet computer, laptop computer, personal computer or the like
  • the user of the sensor device may visualize the determined concentration and/or a history of the determined concentrations, e.g. to evaluate a trend in these concentrations, on this external device.
  • This for example is particularly advantageous where the sensor device is to be kept as compact as possible, in which case the omission of a user interface such as a display from the sensor device assists in achieving this objective.
  • the sensor device further comprises a communication module communicatively coupled to the first airborne pollutant sensor and the second airborne pollutant sensor, the communication module being arranged to communicate a first sensor reading provided by the first airborne pollutant sensor and a second sensor reading provided by the second airborne pollutant sensor to an external device comprising a processor for determining a concentration of the airborne pollutant from the first sensor reading and the second sensor reading.
  • the processing of the respective sensor readings is performed on the external device, thus further reducing the footprint and energy consumption of the sensor device, which is particularly advantageous where the sensor device is battery-powered and/or is to be kept as compact as possible.
  • the sensor device is a particulate matter sensor device such as a PM 2.5 sensor device, PM 5 sensor device, PM 10 sensor device or a UFP (ultra- fine particle) sensor device.
  • the first airborne pollutant sensor and the second airborne pollutant sensor may be optical sensors, as such optical sensors are particularly suitable for particulate matter detection and can do so in an energy- efficient manner whilst being compact in size.
  • the sensor device may comprise more than one (optical) sensor in each flow channel, such as for example a combination of particulate matter sensors for determining particles of different sizes.
  • the sensor device may be a wearable sensor device, such that its user can readily determine the concentration of the airborne pollutant of interest on the move.
  • the sensor device may be a portable sensor device and/or may be integrated in an electronic device such as a smart phone or the like, in which case its user may invoke a sensor reading by shaking or otherwise generating the required airflows through the respective flow channels of the sensor device.
  • a method of determining a concentration of an airborne pollutant with the sensor device of any of the embodiments described in this application comprising shaking the sensor device to generate a first airflow through the first flow channel and a second airflow through the second flow channel; obtaining a first sensor reading provided by the first airborne pollutant sensor in the first flow channel;
  • concentration of the airborne pollutant can be determined in an accurate manner without requiring the explicit determination of the respective airflow speeds through the flow channels of the sensor device.
  • the method may further comprise communicating the first sensor reading and the second sensor reading to an external device, and determining the concentration of the airborne pollutant from the first sensor reading and the second sensor reading on said external device.
  • the determining the concentration of the airborne pollutant from the first sensor reading and the second sensor reading may comprise determining the concentration of the airborne pollutant based on a preconfigured calibration function as explained above.
  • FIG. 1 schematically depicts an airborne pollutant sensor according to an embodiment
  • FIG. 2 schematically depicts an airborne pollutant sensor according to another embodiment
  • FIG. 3 schematically depicts an airborne pollutant sensor according to yet another embodiment.
  • FIG. 4 depicts a flowchart of an airborne pollutant concentration measurement method according to an example embodiment.
  • the invention provides a portable (ie preferably wearable or hand-held) sensor device for determining a concentration of an airborne pollutant, comprising:
  • a first flow channel having a first inlet and a first outlet
  • a second flow channel separate from the first flow channel and having a second inlet and a second outlet;
  • first inlet has a first area and the second inlet has a second area, and wherein a ratio between the first area and the second area is larger than 1.5.
  • the invention also provides a method of determining a concentration of an airborne pollutant with this sensor device, the method comprising:
  • FIG. 1 schematically depicts a sensor device 10 according to an embodiment of the present invention.
  • the sensor device 10 comprises a first flow channel 20 comprising a first inlet 21 and a first outlet 23.
  • a first airborne pollutant sensor 22 is located in the first flow channel 20.
  • the sensor device 10 further comprises a second flow channel 30 comprising a second inlet 31 and a second outlet 33.
  • a second airborne pollutant sensor 32 is located in the second flow channel 30.
  • the first airborne pollutant sensor 22 and the second airborne pollutant sensor 32 typically are configured to sense the same airborne pollutant, such as an airborne particle of a certain size.
  • the first airborne pollutant sensor 22 and the second airborne pollutant sensor 32 may be particulate matter sensors such as PM 2.5 sensors, PM 5 sensors, PM 10 sensors or UFP sensors.
  • PM indicates particles having a diameter of said numerical value or less.
  • PM 2.5 refers to airborne particles having a diameter of 2.5 microns or less. It is noted for the avoidance of doubt that such particles are not necessarily spherical, in which case the term diameter refers to the largest cross-section of such particles.
  • the first airborne pollutant sensor 22 and the second and born pollutant sensor 32 are PM 2.5 sensors.
  • the first flow channel 20 and the second flow channel 30 each may comprise more than one sensor.
  • each flow channel may comprise multiple particulate matter sensors such that the concentration of particles of different sizes may be determined with the sensor device 10.
  • the first airborne pollutant sensor 22 may be an optical sensor comprising a light source 24 such as a light emitting diode or a laser and a photodetector 26.
  • the second airborne pollutant sensor 32 may be an optical sensor comprising a light source 34 such as a light emitting diode or a laser and a photodetector 36.
  • Such optical sensors are particularly suitable for the detection of particulate matter in the respective flow channels 20, 30.
  • Such optical sensors typically operate according to the principle that the light source emits light into the flow channel, with the photodetector counting the number of reflections of the emitted light by the airborne pollutant of interest, e.g.
  • the sensor device 10 may comprise a single light source arranged to emit light into both flow channels 20, 30, with separate detectors 26, 36 arranged in the respective flow channels 20, 30.
  • prior art sensor devices typically comprise a fan arranged to generate a known fixed airflow speed through the flow channel during measurement, such that the airborne pollutant concentration can be calculated using this known fixed airflow speed.
  • prior art sensor devices contain an airflow measurement device such as a flow meter or an accelerometer to obtain the actual airflow speed through the flow channel to facilitate the determination of this concentration.
  • the present invention is based on the insight that the sensor device 10 does not need to contain either a flow regulating device such as a fan or an airflow measurement device such as a flow meter or accelerometer in order to facilitate the accurate determination of the concentration of the airborne pollutant with the sensors 22, 32.
  • first inlet 21 of the first flow channel 20 is dimensioned differently to the second inlet 31 of the second flow channel 30, different airflow speeds are generated through these respective flow channels, which ratio between these airflow speeds and the associated ratio between the respective sensor readings of the first sensor 22 and the second sensor 32 in the first flow channel 20 and the second flow channel 30, can be used to determine the concentration of the airborne pollutant in the air passing through the sensor device 10.
  • PM 2.5 the area of the first inlet 21
  • Sb the area of the second inlet 31
  • the detected count can be expressed as Nl and the air flow rate in the detection zone in this flow channel including the sensor 22 can be expressed as Vzl, such that:
  • Equation (3) demonstrates that the mass of air flowing into the first flow channel 20 through first inlet 21 must be equal to the mass of air flowing out of the detection zone of the first flow channel 20. In other words, air cannot be generated or eliminated in this scenario as assuming air temperature/density does not change.
  • the detected count can be expressed as N2 and the air flow rate in the detection zone in this flow channel including the sensor 32 can be expressed as Vz2, such that:
  • Equation (6) is a constant defining the ratio between the respective areas Sa and Sb.
  • the constant e preferably is chosen such that this ratio is more than 1.5, preferably more than 2.25, more preferably more than 3 in order to increase the accuracy of the sensor device 10 as will be demonstrated in more detail below.
  • Equation (6) may be used to approximate equation (4) as follows:
  • Equation (8) and (9) By solving equations (8) and (9), it is possible to obtain the actual PM 2.5 concentration (P), or any other airborne pollutant concentration, without requiring knowledge of the actual (shaking) velocity of the sensor device 10 used to generate an airflow through the sensor device 10.
  • the functions in equations (8) and (9) may be expressed as follows: a+b*Nl
  • Equation (13) is a configurable calibration function that may be deployed to determine P from the particle counts Nl and N2 as obtained with the sensors 22 and 32 in the first flow channel 20 and the second flow channel 30 respectively.
  • the parameters a, b and c (and d if desired although d is factored out in the final calibration function expressed in equation (13)) in equations (10) and (11) may be determined empirically. This for example may be achieved using a controlled experiment in which a series of measurements in which the delivery of an airborne pollutant with a certain concentration to the sensor device 10 at a certain airflow speed, e.g. as measured using a flow meter or the like at the inlets 21, 31 of the sensor device 10, is varied in a systematic manner.
  • the pollutant concentration as determined with the sensor device 10 is compared against a reference determination with a calibrated professional sensor, e.g. a Grimm sensor in case of PM 2.5 particulate matter, and the parameters a, b, c and d may be optimized in order to minimize the discrepancy between the pollutant concentrations as determined with the sensor device 10 and the reference pollutant concentrations as determined with the professional sensor.
  • a calibrated professional sensor e.g. a Grimm sensor in case of PM 2.5 particulate matter
  • the sensor device 10 upon configuration of the calibration function in above equation (13) (calibrated sensor device 10) by extrapolation of the parameters a-d based on the discrepancy between the readings obtained with the Grimm sensor and the uncalibrated sensor device 10, the sensor device 10 is capable of obtaining PM 2.5 concentrations with a good degree of accuracy, with the largest discrepancy between the professional sensor and the sensor device 10 being about 12%, thereby demonstrating that such a calibrated function may be successfully deployed to obtain accurate concentrations of an airborne pollutant without explicit measurement of the respective airflow speeds through the flow channels 20, 30.
  • the ratio between the area of the first inlet 21 and the second inlet 31 should be more than 1.5 in order to achieve an accuracy of at least 70%, with particularly a good accuracy achieved in excess of about 85% when this ratio is more than 2.25, e.g. more than 2.39.
  • a further increase of this ratio e.g. to above 3, may further improve the accuracy of the sensor device 10.
  • This ratio may also be deployed to the first outlet 23 and the second outlet 33, i.e. the area ratio between the first inlet 21 and the second inlet 31 may be the same as the area ratio between the first outlet 23 and the second outlet 33.
  • the respective outlets have the same size as the corresponding inlets such that the respective inlets and outlets are interchangeable.
  • the inlets be formed in the same wall of the sensor device, and it is further preferred that the channels are generally parallel and preferably coextensive across a housing of the sensor device, as shown in Figure 1.
  • the channels are separate, and the inlets and outlets are respectively spaced apart on opposite walls of the sensor device.
  • the sensor device is conveniently accommodated in consumer electronic devices such as smart phones or other smart devices or may be provided as discrete (wearable) sensor devices. Accordingly, it is preferred that it be portable ie handheld or wearable. This also enables the device easily to be shaken, to provide the air flow required, without the need for any other means for forcing air flow such as a fan.
  • the sensor device 10 further comprises a communication module 40 communicatively coupled to the first sensor 22 and the second sensor 32.
  • the communication module 40 is adapted to communicate the sensor readings of the first sensor 22 and the second sensor 32 to an external device 1, which external device 1 may be configured to store the respective sensor readings and/or to process the respective sensor readings.
  • the external device 1 may comprise a processor (not shown) adapted to derive the
  • the external device 1 may store the received sensor readings or the concentration of the airborne pollutant of interest derived from the received sensor readings in a memory or the like, such that a user of the external device 1 and sensor device 10 may obtain a history of determined concentrations of the airborne pollutant of interest, for example to ascertain a trend or development of this concentration over time. This for example may be used by the user to assess the best time of day to exercise, by identifying the period of time during which the concentration of the airborne pollutant of interest has been determined to be the lowest.
  • the communication module 40 may be a near- field communication module or wireless communication module such as a Wi-Fi module, a Bluetooth module, a module deploying a mobile communication standard such as 3G, 4G or 5G, and so on.
  • the communication module 40 may be communicatively coupled to the external device 1 in any suitable manner such as a P2P manner, via a bridge device such as a router or over a network.
  • the external device 1 may be any suitable electronic device capable of communicating with the communication module 40 in such a manner.
  • the external device 1 may be a portable device such as a smart phone, a tablet computer, a laptop computer or the like or alternatively may be a desktop computer or the like.
  • the external device 1 may be configured by a software program such as an app or the like to implement the processing functionality of the sensor signals of the sensor device 10 as received from the communication module 40, which software program may be downloadable from a service such as an app store providing such software programs.
  • the embodiment of the sensor device 10 as schematically depicted in FIG. 1 is particularly advantageous when the sensor device 10 is a battery-powered wearable sensor device, such that the sensor device 10 can be kept as compact as possible and exhibits a long battery life due to the fact that the energy-intensive processing of the sensor signals generated by the sensors 22 and 32 is not performed by the sensor device 10 itself.
  • the senor device 10 further comprises a processor 50 arranged to determine the
  • the sensor device 10 may be a wearable sensor device or may form part of an electronic device, e.g. a portable electronic device such as a smart phone, tablet computer, laptop computer or the like.
  • the sensor device 10 may further comprise a communication module 40, e.g. a communication module as previously explained, communicatively coupled to the processor 50 and arranged to communicate the determined concentration of the airborne pollutant to an external device 1 , e.g. an external device 1 as previously explained.
  • the external device 1 may be used to store and/or visualize the determined concentrations of the airborne pollutant, e.g. to facilitate evaluation of trends in the determined pollutant concentrations as previously explained.
  • the sensor device 10 may be a self-contained sensor device comprising a processor 50 arranged to determine the concentration of the airborne pollutant from a first sensor reading provided by the first airborne pollutant sensor 22 and a second sensor reading provided by the second airborne pollutant sensor 32 as previously explained and a sensory output device 60 communicatively coupled to the processor 50 for generating a sensory output indicative of the determined concentration of the airborne pollutant.
  • a sensory output device for example may be a display such as a touchscreen display or the like.
  • the sensor device 10 may further comprise a data storage device such as a memory or the like for storing the determined airborne pollutant concentrations together with metadata such as place and/or time of the determined concentration to facilitate evaluation of the determined concentrations, e.g. trends, at a later point in time as previously explained.
  • the sensor device 10 may further comprise a user interface, which may form part of the sensory output device 60, e.g. a touchscreen display, such that a user of the sensor device 10 may invoke an evaluation mode of the concentration data captured with the sensor device 10.
  • FIG. 4 depicts a flowchart of a method 100 of determining a concentration of an airborne pollutant with the sensor device 10 according to an embodiment of the present invention.
  • the method 100 starts in operation 101 in which a user shakes or otherwise moves the sensor device 10 to generate a first airflow through the first flow channel 20 and a second airflow through the second flow channel 30. This triggers the obtaining of a first sensor reading provided by the first airborne pollutant sensor 22 in the first flow channel 20 in operation 103 and the obtaining of a second sensor reading provided by the second airborne pollutant sensor 32 in the second flow channel 30 in operation 105.
  • operations 103 and 105 are typically performed
  • the method 100 then proceeds to operation 107 in which the concentration of the airborne pollutant from the first sensor reading and the second sensor reading is determined, for example based on a preconfigured calibration function such as the function expressed by equation (13) as previously explained.
  • This operation may be performed on the sensor device 10 or an external device 1 as previously explained, in which case this operation may further comprise transmitting the respective sensor readings to the external device 1 for processing by the external device 1 as previously explained.
  • the method 100 may revert back to operation 101 in which the user shakes the sensor device 10 again. Otherwise, the method 100 may terminate in 111.

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Abstract

L'invention concerne un dispositif de capteur (10) pour déterminer une concentration d'un polluant en suspension dans l'air sans avoir besoin de commander ou de mesurer une vitesse d'écoulement d'air à travers le dispositif de capteur. Le dispositif de capteur comprend un premier canal d'écoulement (20) ayant une première entrée (21) et une première sortie (23) ; un premier capteur de polluant aéroporté (22) dans le premier canal d'écoulement ; un second canal d'écoulement (30) ayant une seconde entrée (31) et une seconde sortie (33) ; un second capteur de polluant aéroporté (32) dans le second canal d'écoulement, la première entrée ayant une première zone et la seconde entrée ayant une seconde zone, et un rapport entre la première zone et la seconde zone étant supérieur à 1,5. L'invention concerne également un procédé de détermination d'une concentration d'un polluant en suspension dans l'air avec un tel dispositif de capteur (10).
PCT/EP2017/081604 2016-12-16 2017-12-06 Détection de polluants aériens sans ventilateur Ceased WO2018108646A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN2016000689 2016-12-16
CNPCT/CN2016/000689 2016-12-16
EP17163753.1A EP3382367A1 (fr) 2017-03-30 2017-03-30 Détection de polluants aérogènes sans ventilateur
EP17163753.1 2017-03-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018213923A1 (de) * 2018-08-17 2020-02-20 Koninklijke Philips N.V. Portable Luftqualitätserfassungsvorrichtung und entsprechendes Luftqualitätserfassungsverfahren

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008145353A (ja) 2006-12-12 2008-06-26 Denso Corp 液中粒子濃度検出装置
CN203551443U (zh) 2013-11-05 2014-04-16 锦州海伯伦汽车电子有限公司 内置风机式颗粒物传感器
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