WO2015025495A1 - Method and device for detecting concentration of tiny particulates in air sample - Google Patents

Method and device for detecting concentration of tiny particulates in air sample Download PDF

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Publication number
WO2015025495A1
WO2015025495A1 PCT/JP2014/004121 JP2014004121W WO2015025495A1 WO 2015025495 A1 WO2015025495 A1 WO 2015025495A1 JP 2014004121 W JP2014004121 W JP 2014004121W WO 2015025495 A1 WO2015025495 A1 WO 2015025495A1
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Prior art keywords
particulates
concentration
total
tiny
container
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PCT/JP2014/004121
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French (fr)
Inventor
Tong Zhang
Yu Liu
Haopeng LI
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Sharp Corp
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Sharp Corp
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Priority to US14/911,650 priority Critical patent/US9784658B2/en
Priority to JP2016507919A priority patent/JP6096374B2/en
Publication of WO2015025495A1 publication Critical patent/WO2015025495A1/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
    • 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
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
    • 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
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/24—Suction devices
    • 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
    • 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
    • G01N33/0011—Sample conditioning
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire

Definitions

  • the present disclosure relates to detection of air quality, and more particularly, to a method, device, sensor and air purifier capable of detecting a concentration of tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value in an air sample.
  • Patent Document CN102680349A discloses a PM2.5 monitoring device equipped with an inertial impactor. Although the inertial impactor works well in size separation, its high cost, large dimension and precise control of air flow rate limit its application in home scenarios.
  • Patent Document JP2011179862 discloses a method for calculating sedimentation velocity of particulates in liquid phase. Although there is also a deposition process for particulates in the air, it is very different from the deposition process in liquid phase. The viscosity of air is much lower than that of liquid and thus the Brownian dispersion in the air cannot be neglected. Since the Brownian dispersion is sensitive to many factors such as concentration gradient, temperature and particulate size, it is difficult to detect the size distribution of suspended particulates in the air precisely using the deposition methods.
  • An aspect of the invention provides a device for detecting a concentration of tiny particulates in an air sample, the tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value, the device including:
  • controller is configured to:
  • Another aspect of the invention provides a sensor, including:
  • a sensing unit having an air path through the sensing unit and operative to sense a concentration of particulates in an air sample within the air path;
  • controller is configured to:
  • Another aspect of the invention provides a method for detecting a concentration of tiny particulates in an air sample within a container, the tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value, the method including:
  • a device for detecting a concentration of tiny particulates in an air sample comprises: a container that contains the air sample and has an opening; a sealing mechanism that opens or seals the opening; a sensor provided in the container and operative to sense a total concentration of particulates in the air sample within the container; and a controller connected to the sensor and operative to control the sealing mechanism.
  • the controller is configured to: control the sealing mechanism to open the opening and the sensor to sense a first total concentration of particulates; control the sealing mechanism to seal the opening, so as to seal the container for a predetermined time period, and then control the sensor to sense a second total concentration of particulates; calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
  • the predetermined relationship is represented as a correction coefficient obtained by: injecting a reference air sample into the container, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates; sensing a first total reference concentration of particulates using the sensor; sensing a second total reference concentration of particulates using the sensor after the container has been sealed for the predetermined time period; and calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
  • the container further comprises a check valve that is opened while the opening is opened and closed while the opening is sealed.
  • the device further comprises an air pump that pumps air from the container via the check valve while the opening is opened, so as to accelerate entry of air outside the container into the container via the opening and to accelerate dispersion of the particulates within the container.
  • the opening is arranged below the sensor.
  • the predetermined value is 2.5 micro meter.
  • the predetermined time period is 3 minutes.
  • a sensor comprises: a sensing unit having an air path through the sensing unit and operative to sense a concentration of particulates in an air sample within the air path; a sealing mechanism that opens or seals the air path; and a controller connected to the sensing unit and operative to control the sealing mechanism.
  • the controller is configured to: control the sealing mechanism to open the air path and the sensing unit to sense a first total concentration of particulates; control the sealing mechanism to seal the air path for a predetermined time period, and then control the sensing unit to sense a second total concentration of particulates; calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates, the tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value; and calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
  • the predetermined relationship is represented as a correction coefficient obtained by: injecting a reference air sample into the air path, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates; sensing a first total reference concentration of particulates using the sensing unit; sensing a second total reference concentration of particulates using the sensing unit after the air path has been sealed for the predetermined time period; and calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
  • the predetermined value is 2.5 micro meter.
  • the predetermined time period is 3 minutes.
  • an air purifier comprises the device according to the above first aspect or the sensor according to the above second aspect.
  • a method for detecting a concentration of tiny particulates in an air sample within a container comprises: sensing an initial first total concentration of particulates in the air sample; sensing a second total concentration of particulates in the air sample after the container has been sealed for a predetermined time period; calculating a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and calculating the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
  • the predetermined relationship is represented as a correction coefficient obtained by: injecting a reference air sample into the container, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates; sensing a first total reference concentration of particulates; sensing a second total reference concentration of particulates after the container has been sealed for the predetermined time period; and calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
  • the method further comprises: using an air pump to accelerate entry of air outside the container into the container while the container is not sealed and to accelerate dispersion of the particulates within the container.
  • the predetermined value is 2.5micro meter.
  • the predetermined time period is 3 minutes.
  • Figs. 1(a) and 1(b) are schematic diagrams of a device for detecting a concentration of tiny particulates in an air sample according to an embodiment of the present disclosure
  • Figs. 2(a) and 2(b) are schematic diagrams of a device for detecting a concentration of tiny particulates in an air sample according to another embodiment of the present disclosure
  • Figs. 3(a) and 3(b) are schematic diagrams of a sensor according to an embodiment of the present disclosure
  • Fig. 4 is a flowchart illustrating a method for detecting a concentration of tiny particulates in an air sample according to an embodiment of the present disclosure.
  • a "tiny particulate” refers to a particulate matter having an aerodynamic equivalent diameter equal to or smaller than a predetermined value.
  • a "tiny particulate” may refer to a particulate matter having an aerodynamic equivalent diameter equal to or smaller than 10 micro meter.
  • a "tiny particulate” include a particulate matter having an aerodynamic equivalent diameter equal to or smaller than 2.5 micro meter (PM2.5).
  • Figs. 1(a) and 1(b) are schematic diagrams of a device 100 for detecting a concentration of tiny particulates in an air sample according to an embodiment of the present disclosure.
  • Figs. 1(a) and 1(b) show two operation states of the device 100, respectively.
  • the device 100 includes: a container 110 that contains the air sample and has an opening; a sealing mechanism 120 that opens or seals the opening; and a sensor 130 provided in the container 110 and operative to sense a total concentration of particulates in the air sample within the container 110.
  • the opening is arranged below the sensor 130, so as to prevent excessively large particulates in the air outside the container 110 from entering into the container 110, which may otherwise cause interference to the detection result.
  • the device 100 further includes a controller 140 connected to the sensor 130 and operative to control the sealing mechanism 120.
  • the controller 140 controls the sealing mechanism 120 to open the opening.
  • the air sample inside the container is substantially the same as the air outside the container, i.e., they have the same concentration of particulates.
  • the controller 140 controls the sensor 130 to sense a total concentration C1 of particulates (i.e., a total concentration of particulates in the air sample within the container 110 when the opening of the container 110 is opened).
  • the controller 140 controls the sealing mechanism 120 to seal the opening, so as to seal the container 110 for a predetermined time period.
  • the controller 140 controls the sensor 130 to sense a total concentration C2 of particulates (i.e., a total concentration of particulates in the air sample within the container 110 after the contained 110 has been sealed for the predetermined time period).
  • the above predetermined time period is 3 minutes.
  • the controller 140 calculates a ratio R of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio R of the concentration of tiny particulates to the total concentration of particulates and a ratio of the total concentration C2 of particulates to the total concentration C1 of particulates.
  • the controller 140 calculates the concentration C of tiny particulates in the air sample based on the total concentration C1 of particulates and the ratio R of the concentration of tiny particulates to the total concentration of particulates.
  • the predetermined relationship can be represented as a correction coefficient n obtained by: injecting a reference air sample into the container 110, the reference air sample having a known ratio r of the concentration of tiny particulates to the total concentration of particulates; sensing an initial total reference concentration c1 of particulates using the sensor 130; sensing a total reference concentration c2 of particulates using the sensor 130 after the container 110 has been sealed for the predetermined time period; and calculating the correction coefficient n by dividing the known ratio r of the concentration of tiny particulates to the total concentration of particulates by the ratio of the total reference concentration c2 of particulates to the total reference concentration c1 of particulates.
  • the correction coefficient n may be dependent on a number of factors, such as the container 110's shape and size as well as the location of the sensor 130 in the container 110. Thus, it is difficult to calculate the correction coefficient n using a fixed mathematical equation. Rather, with the above experiments, it is possible to obtain n based on Equation (2).
  • n can be represented in a form of a lookup table.
  • An exemplary relationship between c2/c1 and n is listed in Table 1 below.
  • the ratio R of the concentration of tiny particulates to the total concentration of particulates can be calculated as follows:
  • Figs. 2(a) and 2(b) are schematic diagrams of a device 200 for detecting a concentration of tiny particulates in an air sample according to another embodiment of the present disclosure.
  • the device 200 includes a container 210, a sealing mechanism 220, a sensor 230 and a controller 240.
  • the configurations and operations of the container 210, sealing mechanism 220, sensor 230 and controller 240 are substantially the same as those of the container 110, sealing mechanism 120, sensor 130 and controller 140 as shown in Fig. 1 and the description thereof will thus be omitted here.
  • the container 210 further includes a check valve 212 that is opened while the opening is opened (as shown in Fig. 2(a)) and closed while the opening is sealed (as shown in Fig. 2(b)).
  • the device 200 further includes an air pump 250 that pumps air from the container 210 via the check valve 212 while the opening is opened, so as to accelerate entry of air outside the container 210 into the container 210 via the opening and to accelerate dispersion of the particulates within the container 210.
  • Figs. 3(a) and 3(b) are schematic diagrams of a sensor 300 according to an embodiment of the present disclosure.
  • the sensor 300 includes: a sensing unit 310 having an air path 312 through the sensing unit 310 and operative to sense a concentration of particulates in an air sample within the air path 312.
  • the sensor 300 further includes: a sealing mechanism 320 that opens or seals the air path 312.
  • the air path 312 has one end sealed and the other end connected to one end of a glass tube 314 that contains the air sample.
  • the sealing mechanism 320 is capable of opening or sealing the other end of the glass tube, so as to open or seal the air path 312.
  • the sealing mechanism 320 can be implemented using an electromagnetic element.
  • Both ends of the air path can be opened or sealed by the sealing mechanism 320 (e.g., by providing a sealing mechanism 320 at each end of the air path).
  • the glass tube 314 is optional. Without the glass tube 314, the sealing mechanism 320 can seal the air path 312 directly.
  • the sensor 300 further includes a controller 330 connected to the sensing unit 310 and operative to control the sealing mechanism 320.
  • the controller 330 controls the sealing mechanism 320 to open the air path 312 and the sensing unit 310 to sense a total concentration C1 of particulates (i.e., a total concentration of particulates in the air sample within the air path 312 when the air path 312 is opened).
  • the controller 330 controls the sealing mechanism 320 to seal the air path 312 for a predetermined time period.
  • the controller 330 controls the sensing unit 310 to sense a total concentration C2 of particulates (i.e., a total concentration of particulates in the air sample within the air path 312 after the air path 312 has been sealed for the predetermined time period).
  • the above predetermined time period is 3 minutes.
  • the controller 330 calculates a ratio R of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio R of the concentration of tiny particulates to the total concentration of particulates and a ratio of the total concentration C2 of particulates to the total concentration C1 of particulates.
  • the controller 330 calculates the concentration C of tiny particulates in the air sample, based on the total concentration C1 of particulates and the ratio R of the concentration of tiny particulates to the total concentration of particulates.
  • the predetermined relationship can be represented as a correction coefficient n obtained by: injecting a reference air sample into the air path 312, the reference air sample having a known ratio r of the concentration of tiny particulates to the total concentration of particulates; sensing an initial total reference concentration c1 of particulates using the sensing unit 310; sensing a total reference concentration c2 of particulates using the sensing unit 310 after the air path 312 has been sealed for the predetermined time period; and calculating the correction coefficient n by dividing the known ratio r of the concentration of tiny particulates to the total concentration of particulates by the ratio of the total reference concentration c2 of particulates to the total reference concentration c1 of particulates.
  • the correction coefficient n can be obtained based on the above Equation (2) or Table 1. Then, the ratio R of the concentration of tiny particulates to the total concentration of particulates can be calculated based on the above Equation (3). Finally, the concentration C of tiny particulates can be calculated based on the above Equation (1).
  • an air purifier is provided.
  • the air purifier includes the above device 100, device 200 or sensor 300.
  • a method 400 for detecting a concentration of tiny particulates in an air sample within a container is provided.
  • the tiny particulates each have an aerodynamic equivalent diameter equal to or smaller than a predetermined value.
  • the method 400 includes the following steps.
  • step S410 an initial first total concentration of particulates in the air sample is sensed.
  • a second total concentration of particulates in the air sample is sensed after the container has been sealed for a predetermined time period.
  • a ratio of a concentration of tiny particulates to a total concentration of particulates is calculated based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates.
  • the concentration of tiny particulates in the air sample is calculated based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
  • the predetermined relationship is represented as a correction coefficient obtained by: injecting a reference air sample into the container, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates; sensing a first total reference concentration of particulates; sensing a second total reference concentration of particulates after the container has been sealed for the predetermined time period; and calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
  • the method 400 further includes: using an air pump to accelerate entry of air outside the container into the container while the container is not sealed and to accelerate dispersion of the particulates within the container.
  • the predetermined value is 2.5 micro meter.
  • the predetermined time period is 3 minutes.
  • the present disclosure provides a method, device, sensor and air purifier for detecting a concentration of tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value in an air sample, capable of detecting the concentration of tiny particulates more precisely without a significant increase in cost.

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Abstract

A device for detecting a concentration of tiny particulates in an air sample is provided. The device comprises: a container that contains the air sample and has an opening; a sealing mechanism that opens or seals the opening; a sensor provided in the container and operative to sense a total concentration of particulates in the air sample within the container; and a controller connected to the sensor and operative to control the sealing mechanism. The controller is configured to: control the sealing mechanism to open the opening and the sensor to sense a first total concentration of particulates; control the sealing mechanism to seal the opening, so as to seal the container for a predetermined time period, and then control the sensor to sense a second total concentration of particulates; calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.

Description

METHOD AND DEVICE FOR DETECTING CONCENTRATION OF TINY PARTICULATES IN AIR SAMPLE
The present disclosure relates to detection of air quality, and more particularly, to a method, device, sensor and air purifier capable of detecting a concentration of tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value in an air sample.
With the rapid industrialization and the explosive growth in the number of motor vehicles in recent years, air pollutions become increasingly severe. In China, the concentration of tiny particulates, particularly fine particulates (each having an aerodynamic equivalent diameter equal to or smaller than 2.5 micro meter, also known as PM2.5), as dominant atmospheric pollutants in the atmosphere, has been continued at a high level since early 2013. The hazy weather has significantly increased and people's health and daily lives are in serious danger. There is thus a need for a detection device for detecting concentration of tiny particulates.
Currently, there have been a number of methods for detecting tiny particulates in the air, including for example quartz oscillating microbalance method, beta ray method and light scattering method. Most of these methods require an inertial impactor as a front-end device for separating tiny particulates from larger particulates. As an example, Patent Document CN102680349A discloses a PM2.5 monitoring device equipped with an inertial impactor. Although the inertial impactor works well in size separation, its high cost, large dimension and precise control of air flow rate limit its application in home scenarios.
On the other hand, deposition methods have been used conventionally for detecting size distribution of particulates in liquid phase. As an example, Patent Document JP2011179862 discloses a method for calculating sedimentation velocity of particulates in liquid phase. Although there is also a deposition process for particulates in the air, it is very different from the deposition process in liquid phase. The viscosity of air is much lower than that of liquid and thus the Brownian dispersion in the air cannot be neglected. Since the Brownian dispersion is sensitive to many factors such as concentration gradient, temperature and particulate size, it is difficult to detect the size distribution of suspended particulates in the air precisely using the deposition methods.
It is an object of the present disclosure to provide a method, device, sensor and air purifier for detecting a concentration of tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value in an air sample, capable of detecting the concentration of tiny particulates more precisely without a significant increase in cost.
An aspect of the invention provides a device for detecting a concentration of tiny particulates in an air sample, the tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value, the device including:
(a) a container that contains the air sample and has an opening;
(b) a sealing mechanism that opens or seals the opening;
(c) a sensor provided in the container and operative to sense a total concentration of particulates in the air sample within the container; and
(d)a controller connected to the sensor and operative to control the sealing mechanism,
wherein the controller is configured to:
(i) control the sealing mechanism to open the opening and the sensor to sense a first total concentration of particulates;
(ii) control the sealing mechanism to seal the opening, so as to seal the container for a predetermined time period, and then control the sensor to sense a second total concentration of particulates;
(iii) calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and
(iv) calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
Another aspect of the invention provides a sensor, including:
(a) a sensing unit having an air path through the sensing unit and operative to sense a concentration of particulates in an air sample within the air path;
(b) a sealing mechanism that opens or seals the air path; and
(c) a controller connected to the sensing unit and operative to control the sealing mechanism,
wherein the controller is configured to:
(i) control the sealing mechanism to open the air path and the sensing unit to sense a first total concentration of particulates;
(ii) control the sealing mechanism to seal the air path for a predetermined time period, and then control the sensing unit to sense a second total concentration of particulates;
(iii) calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates, the tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value; and
(iv) calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
Another aspect of the invention provides a method for detecting a concentration of tiny particulates in an air sample within a container, the tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value, the method including:
(a) sensing an initial first total concentration of particulates in the air sample;
(b) sensing a second total concentration of particulates in the air sample after the container has been sealed for a predetermined time period;
(c) calculating a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and
(d) calculating the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
According to a first aspect of the present disclosure, a device for detecting a concentration of tiny particulates in an air sample is provided. The tiny particulates each have an aerodynamic equivalent diameter equal to or smaller than a predetermined value. The device comprises: a container that contains the air sample and has an opening; a sealing mechanism that opens or seals the opening; a sensor provided in the container and operative to sense a total concentration of particulates in the air sample within the container; and a controller connected to the sensor and operative to control the sealing mechanism. The controller is configured to: control the sealing mechanism to open the opening and the sensor to sense a first total concentration of particulates; control the sealing mechanism to seal the opening, so as to seal the container for a predetermined time period, and then control the sensor to sense a second total concentration of particulates; calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
In an embodiment, the predetermined relationship is represented as a correction coefficient obtained by: injecting a reference air sample into the container, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates; sensing a first total reference concentration of particulates using the sensor; sensing a second total reference concentration of particulates using the sensor after the container has been sealed for the predetermined time period; and calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
Preferably, the container further comprises a check valve that is opened while the opening is opened and closed while the opening is sealed. The device further comprises an air pump that pumps air from the container via the check valve while the opening is opened, so as to accelerate entry of air outside the container into the container via the opening and to accelerate dispersion of the particulates within the container.
Preferably, the opening is arranged below the sensor.
Preferably, the predetermined value is 2.5 micro meter.
Preferably, the predetermined time period is 3 minutes.
According to a second aspect of the present disclosure, a sensor is provided. The sensor comprises: a sensing unit having an air path through the sensing unit and operative to sense a concentration of particulates in an air sample within the air path; a sealing mechanism that opens or seals the air path; and a controller connected to the sensing unit and operative to control the sealing mechanism. The controller is configured to: control the sealing mechanism to open the air path and the sensing unit to sense a first total concentration of particulates; control the sealing mechanism to seal the air path for a predetermined time period, and then control the sensing unit to sense a second total concentration of particulates; calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates, the tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value; and calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
In an embodiment, the predetermined relationship is represented as a correction coefficient obtained by: injecting a reference air sample into the air path, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates; sensing a first total reference concentration of particulates using the sensing unit; sensing a second total reference concentration of particulates using the sensing unit after the air path has been sealed for the predetermined time period; and calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
Preferably, the predetermined value is 2.5 micro meter.
Preferably, the predetermined time period is 3 minutes.
According to a third aspect of the present disclosure, an air purifier is provided. The air purifier comprises the device according to the above first aspect or the sensor according to the above second aspect.
According to a fourth aspect of the present disclosure, a method for detecting a concentration of tiny particulates in an air sample within a container is provided. The tiny particulates each have an aerodynamic equivalent diameter equal to or smaller than a predetermined value. The method comprises: sensing an initial first total concentration of particulates in the air sample; sensing a second total concentration of particulates in the air sample after the container has been sealed for a predetermined time period; calculating a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and calculating the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
In an embodiment, the predetermined relationship is represented as a correction coefficient obtained by: injecting a reference air sample into the container, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates; sensing a first total reference concentration of particulates; sensing a second total reference concentration of particulates after the container has been sealed for the predetermined time period; and calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
Preferably, the method further comprises: using an air pump to accelerate entry of air outside the container into the container while the container is not sealed and to accelerate dispersion of the particulates within the container.
Preferably, the predetermined value is 2.5micro meter.
Preferably, the predetermined time period is 3 minutes.
With the embodiments of the present disclosure, it is possible to detect the concentration of tiny particulates more precisely without a significant increase in cost.
The above and other objects, features and advantages of the present disclosure will be more apparent from the following preferred embodiments illustrated with reference to the figures, in which:
Figs. 1(a) and 1(b) are schematic diagrams of a device for detecting a concentration of tiny particulates in an air sample according to an embodiment of the present disclosure; Figs. 2(a) and 2(b) are schematic diagrams of a device for detecting a concentration of tiny particulates in an air sample according to another embodiment of the present disclosure; Figs. 3(a) and 3(b) are schematic diagrams of a sensor according to an embodiment of the present disclosure; and Fig. 4 is a flowchart illustrating a method for detecting a concentration of tiny particulates in an air sample according to an embodiment of the present disclosure.
In the following, the embodiments of the present disclosure will be described with reference to the figures, throughout which same reference signs refer to same or similar elements.
The present disclosure is based on the fact that, according to the fundamental aerosol dynamics, the larger a particulate is, the faster it will deposit. Hence, for an air sample within a sealed space, there is a predetermined relationship between a concentration variation of particulates and a ratio of tiny particulates to all particulates in a static deposition process. An approximate estimate of the concentration of tiny particulates can be calculated from such relationship. As used in the present disclosure, a "tiny particulate" refers to a particulate matter having an aerodynamic equivalent diameter equal to or smaller than a predetermined value. As an example, a "tiny particulate" may refer to a particulate matter having an aerodynamic equivalent diameter equal to or smaller than 10 micro meter. Particularly, a "tiny particulate" include a particulate matter having an aerodynamic equivalent diameter equal to or smaller than 2.5 micro meter (PM2.5).
Figs. 1(a) and 1(b) are schematic diagrams of a device 100 for detecting a concentration of tiny particulates in an air sample according to an embodiment of the present disclosure. Figs. 1(a) and 1(b) show two operation states of the device 100, respectively. As shown, the device 100 includes: a container 110 that contains the air sample and has an opening; a sealing mechanism 120 that opens or seals the opening; and a sensor 130 provided in the container 110 and operative to sense a total concentration of particulates in the air sample within the container 110. In a preferred embodiment, the opening is arranged below the sensor 130, so as to prevent excessively large particulates in the air outside the container 110 from entering into the container 110, which may otherwise cause interference to the detection result.
The device 100 further includes a controller 140 connected to the sensor 130 and operative to control the sealing mechanism 120.
First, as shown in Fig. 1(a), the controller 140 controls the sealing mechanism 120 to open the opening. At this time, the air sample inside the container is substantially the same as the air outside the container, i.e., they have the same concentration of particulates. The controller 140 controls the sensor 130 to sense a total concentration C1 of particulates (i.e., a total concentration of particulates in the air sample within the container 110 when the opening of the container 110 is opened).
Then, as shown in Fig. 1(b), the controller 140 controls the sealing mechanism 120 to seal the opening, so as to seal the container 110 for a predetermined time period. After that, the controller 140 controls the sensor 130 to sense a total concentration C2 of particulates (i.e., a total concentration of particulates in the air sample within the container 110 after the contained 110 has been sealed for the predetermined time period). In an exemplary embodiment, the above predetermined time period is 3 minutes.
The controller 140 calculates a ratio R of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio R of the concentration of tiny particulates to the total concentration of particulates and a ratio of the total concentration C2 of particulates to the total concentration C1 of particulates.
Then, the controller 140 calculates the concentration C of tiny particulates in the air sample based on the total concentration C1 of particulates and the ratio R of the concentration of tiny particulates to the total concentration of particulates.
In other words,
Figure JPOXMLDOC01-appb-I000001
In an embodiment, the predetermined relationship can be represented as a correction coefficient n obtained by: injecting a reference air sample into the container 110, the reference air sample having a known ratio r of the concentration of tiny particulates to the total concentration of particulates; sensing an initial total reference concentration c1 of particulates using the sensor 130; sensing a total reference concentration c2 of particulates using the sensor 130 after the container 110 has been sealed for the predetermined time period; and calculating the correction coefficient n by dividing the known ratio r of the concentration of tiny particulates to the total concentration of particulates by the ratio of the total reference concentration c2 of particulates to the total reference concentration c1 of particulates.
In other words,
Figure JPOXMLDOC01-appb-I000002
It is to be noted that the correction coefficient n may be dependent on a number of factors, such as the container 110's shape and size as well as the location of the sensor 130 in the container 110. Thus, it is difficult to calculate the correction coefficient n using a fixed mathematical equation. Rather, with the above experiments, it is possible to obtain n based on Equation (2).
In an embodiment, n can be represented in a form of a lookup table. An exemplary relationship between c2/c1 and n is listed in Table 1 below.
Figure JPOXMLDOC01-appb-I000003
Specifically, after the correction coefficient n has been obtained, the ratio R of the concentration of tiny particulates to the total concentration of particulates can be calculated as follows:
Figure JPOXMLDOC01-appb-I000004
Reference is now made to Figs. 2(a) and 2(b), which are schematic diagrams of a device 200 for detecting a concentration of tiny particulates in an air sample according to another embodiment of the present disclosure. Like the device 100 shown in Fig. 1, the device 200 includes a container 210, a sealing mechanism 220, a sensor 230 and a controller 240. The configurations and operations of the container 210, sealing mechanism 220, sensor 230 and controller 240 are substantially the same as those of the container 110, sealing mechanism 120, sensor 130 and controller 140 as shown in Fig. 1 and the description thereof will thus be omitted here.
As shown in Fig. 2, the container 210 further includes a check valve 212 that is opened while the opening is opened (as shown in Fig. 2(a)) and closed while the opening is sealed (as shown in Fig. 2(b)). The device 200 further includes an air pump 250 that pumps air from the container 210 via the check valve 212 while the opening is opened, so as to accelerate entry of air outside the container 210 into the container 210 via the opening and to accelerate dispersion of the particulates within the container 210.
Figs. 3(a) and 3(b) are schematic diagrams of a sensor 300 according to an embodiment of the present disclosure. As shown, the sensor 300 includes: a sensing unit 310 having an air path 312 through the sensing unit 310 and operative to sense a concentration of particulates in an air sample within the air path 312. The sensor 300 further includes: a sealing mechanism 320 that opens or seals the air path 312. In the embodiment shown in Fig. 3, the air path 312 has one end sealed and the other end connected to one end of a glass tube 314 that contains the air sample. The sealing mechanism 320 is capable of opening or sealing the other end of the glass tube, so as to open or seal the air path 312. As an example, the sealing mechanism 320 can be implemented using an electromagnetic element.
It is to be noted here that the structure shown in Fig. 3 is illustrative only. Both ends of the air path can be opened or sealed by the sealing mechanism 320 (e.g., by providing a sealing mechanism 320 at each end of the air path). The glass tube 314 is optional. Without the glass tube 314, the sealing mechanism 320 can seal the air path 312 directly.
The sensor 300 further includes a controller 330 connected to the sensing unit 310 and operative to control the sealing mechanism 320.
First, as shown in Fig. 3(a), the controller 330 controls the sealing mechanism 320 to open the air path 312 and the sensing unit 310 to sense a total concentration C1 of particulates (i.e., a total concentration of particulates in the air sample within the air path 312 when the air path 312 is opened).
Then, as shown in Fig. 3(b), the controller 330 controls the sealing mechanism 320 to seal the air path 312 for a predetermined time period. After that, the controller 330 controls the sensing unit 310 to sense a total concentration C2 of particulates (i.e., a total concentration of particulates in the air sample within the air path 312 after the air path 312 has been sealed for the predetermined time period). In an exemplary embodiment, the above predetermined time period is 3 minutes.
The controller 330 calculates a ratio R of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio R of the concentration of tiny particulates to the total concentration of particulates and a ratio of the total concentration C2 of particulates to the total concentration C1 of particulates.
Then, the controller 330 calculates the concentration C of tiny particulates in the air sample, based on the total concentration C1 of particulates and the ratio R of the concentration of tiny particulates to the total concentration of particulates.
In an embodiment, the predetermined relationship can be represented as a correction coefficient n obtained by: injecting a reference air sample into the air path 312, the reference air sample having a known ratio r of the concentration of tiny particulates to the total concentration of particulates; sensing an initial total reference concentration c1 of particulates using the sensing unit 310; sensing a total reference concentration c2 of particulates using the sensing unit 310 after the air path 312 has been sealed for the predetermined time period; and calculating the correction coefficient n by dividing the known ratio r of the concentration of tiny particulates to the total concentration of particulates by the ratio of the total reference concentration c2 of particulates to the total reference concentration c1 of particulates.
More specifically, the correction coefficient n can be obtained based on the above Equation (2) or Table 1. Then, the ratio R of the concentration of tiny particulates to the total concentration of particulates can be calculated based on the above Equation (3). Finally, the concentration C of tiny particulates can be calculated based on the above Equation (1).
According to another embodiment of the present disclosure, an air purifier is provided. The air purifier includes the above device 100, device 200 or sensor 300.
According to yet another embodiment of the present disclosure, a method 400 for detecting a concentration of tiny particulates in an air sample within a container is provided. The tiny particulates each have an aerodynamic equivalent diameter equal to or smaller than a predetermined value. As shown in Fig. 4, the method 400 includes the following steps.
At step S410, an initial first total concentration of particulates in the air sample is sensed.
At step S420, a second total concentration of particulates in the air sample is sensed after the container has been sealed for a predetermined time period.
At step S430, a ratio of a concentration of tiny particulates to a total concentration of particulates is calculated based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates.
At step S440, the concentration of tiny particulates in the air sample is calculated based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
In an embodiment, the predetermined relationship is represented as a correction coefficient obtained by: injecting a reference air sample into the container, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates; sensing a first total reference concentration of particulates; sensing a second total reference concentration of particulates after the container has been sealed for the predetermined time period; and calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
Preferably, the method 400 further includes: using an air pump to accelerate entry of air outside the container into the container while the container is not sealed and to accelerate dispersion of the particulates within the container.
Preferably, the predetermined value is 2.5 micro meter.
Preferably, the predetermined time period is 3 minutes.
The present disclosure provides a method, device, sensor and air purifier for detecting a concentration of tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value in an air sample, capable of detecting the concentration of tiny particulates more precisely without a significant increase in cost.
The present disclosure has been described above with reference to the preferred embodiments thereof. It should be understood that various modifications, alternations and additions can be made by those skilled in the art without departing from the spirits and scope of the present disclosure. Therefore, the scope of the present disclosure is not limited to the above particular embodiments but only defined by the claims as attached and the equivalents thereof.

Claims (16)

  1. A device for detecting a concentration of tiny particulates in an air sample, the tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value, the device comprising:
    (a) a container that contains the air sample and has an opening;
    (b) a sealing mechanism that opens or seals the opening;
    (c) a sensor provided in the container and operative to sense a total concentration of particulates in the air sample within the container; and
    (d) a controller connected to the sensor and operative to control the sealing mechanism,
    wherein the controller is configured to:
    (i) control the sealing mechanism to open the opening and the sensor to sense a first total concentration of particulates;
    (ii) control the sealing mechanism to seal the opening, so as to seal the container for a predetermined time period, and then control the sensor to sense a second total concentration of particulates;
    (iii) calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and
    (iv) calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
  2. The device of claim 1, wherein the predetermined relationship is represented as a correction coefficient obtained by:
    injecting a reference air sample into the container, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates;
    sensing a first total reference concentration of particulates using the sensor;
    sensing a second total reference concentration of particulates using the sensor after the container has been sealed for the predetermined time period; and
    calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
  3. The device of claim 2, wherein
    the container further comprises a check valve that is opened while the opening is opened and closed while the opening is sealed, and
    the device further comprises an air pump that pumps air from the container via the check valve while the opening is opened, so as to accelerate entry of air outside the container into the container via the opening and to accelerate dispersion of the particulates within the container.
  4. The device of claim 1, wherein the opening is arranged below the sensor.
  5. The device of any of claims 1-4, wherein the predetermined value is 2.5 micro meter.
  6. The device of any of claims 1-4, wherein the predetermined time period is 3 minutes.
  7. A sensor, comprising:
    (a) a sensing unit having an air path through the sensing unit and operative to sense a concentration of particulates in an air sample within the air path;
    (b) a sealing mechanism that opens or seals the air path; and
    (c) a controller connected to the sensing unit and operative to control the sealing mechanism,
    wherein the controller is configured to:
    (i) control the sealing mechanism to open the air path and the sensing unit to sense a first total concentration of particulates;
    (ii) control the sealing mechanism to seal the air path for a predetermined time period, and then control the sensing unit to sense a second total concentration of particulates;
    (iii) calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates, the tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value; and
    (iv) calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
  8. The sensor of claim 7, wherein the predetermined relationship is represented as a correction coefficient obtained by:
    injecting a reference air sample into the air path, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates;
    sensing a first total reference concentration of particulates using the sensing unit;
    sensing a second total reference concentration of particulates using the sensing unit after the air path has been sealed for the predetermined time period; and
    calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
  9. The sensor of any of claims 7-8, wherein the predetermined value is 2.5 micro meter.
  10. The sensor of any of claims 7-8, wherein the predetermined time period is 3 minutes.
  11. An air purifier, comprising the device according to any of claims 1-6 or the sensor according to any of claims 7-10.
  12. A method for detecting a concentration of tiny particulates in an air sample within a container, the tiny particulates each having an aerodynamic equivalent diameter equal to or smaller than a predetermined value, the method comprising:
    (a) sensing an initial first total concentration of particulates in the air sample;
    (b) sensing a second total concentration of particulates in the air sample after the container has been sealed for a predetermined time period;
    (c) calculating a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and
    (d) calculating the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.
  13. The method of claim 12, wherein the predetermined relationship is represented as a correction coefficient obtained by:
    injecting a reference air sample into the container, the reference air sample having a known ratio of the concentration of tiny particulates to the total concentration of particulates;
    sensing a first total reference concentration of particulates;
    sensing a second total reference concentration of particulates after the container has been sealed for the predetermined time period; and
    calculating the correction coefficient by dividing the known ratio of the concentration of tiny particulates to the total concentration of particulates by the ratio of the second total reference concentration of particulates to the first total reference concentration of particulates.
  14. The method of claim 12, further comprising:
    using an air pump to accelerate entry of air outside the container into the container while the container is not sealed and to accelerate dispersion of the particulates within the container.
  15. The method of any of claims 12-14, wherein the predetermined value is 2.5 micro meter.
  16. The method of any of claims 12-14, wherein the predetermined time period is 3 minutes.
PCT/JP2014/004121 2013-08-20 2014-08-07 Method and device for detecting concentration of tiny particulates in air sample Ceased WO2015025495A1 (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6515683B2 (en) * 2015-05-29 2019-05-22 富士通株式会社 Measuring device and measuring system
US10365197B2 (en) * 2015-06-12 2019-07-30 Koninklijke Philips N.V. Optical particle sensor and sensing method
JP6651753B2 (en) * 2015-09-09 2020-02-19 富士電機株式会社 Particle composition analyzer
ES2943500T3 (en) * 2019-02-04 2023-06-13 Keraco S A Gas absorber module comprising a gas sensor control device
CN113628399A (en) * 2021-07-23 2021-11-09 新疆交通职业技术学院(新疆交通技师培训学院 新疆交通干部学校) Safety monitoring system for new energy automobile
CN115598026B (en) * 2022-12-14 2023-02-28 水利部交通运输部国家能源局南京水利科学研究院 A system and method for measuring sediment deposition process in a tank
CN118583586B (en) * 2024-08-06 2024-10-22 洛阳葛丰农业有限公司 Vegetable greenhouse planting environment detection equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08261904A (en) * 1995-03-22 1996-10-11 Mita Ind Co Ltd Fine particle concentration measuring device
JP2004340897A (en) * 2003-05-19 2004-12-02 Shimadzu Corp Method for measuring the density of suspended particulate matter in the atmosphere
JP2006349448A (en) * 2005-06-15 2006-12-28 Kowa Co Atmospheric particulate measuring device
JP2008139294A (en) * 2006-11-08 2008-06-19 Honda Motor Co Ltd Detection apparatus and method
JP3158839U (en) * 2010-01-07 2010-04-22 独立行政法人産業技術総合研究所 PM2.5 classifier for normal high volume air sampler

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5723840A (en) * 1980-07-18 1982-02-08 Shimadzu Corp Measuring device for automatic particle size distribution
JP3391154B2 (en) * 1995-06-30 2003-03-31 株式会社島津製作所 Particle size distribution / density distribution simultaneous measurement device
CN101329249B (en) * 2008-08-04 2011-10-12 天津信达北方科技有限公司 Analytical method and instrument for tiny particles in gas
CN102369426B (en) * 2009-04-01 2013-05-08 新日铁住金株式会社 Continuous measurement device and measurement method of horizontal flux of dustfall in the atmosphere
JP2011179862A (en) 2010-02-26 2011-09-15 Kansai Electric Power Co Inc:The Calculation method of particle sedimentation velocity
CN102680349B (en) 2012-03-30 2016-03-30 北京安赛博技术有限公司 The monitoring equipment of a kind of PM2.5
CN102706780B (en) * 2012-06-14 2014-01-08 江苏苏净集团有限公司 Instrument for monitoring small particulate matters in air
CN102692366A (en) * 2012-06-14 2012-09-26 苏州苏净仪器自控设备有限公司 Instrument for monitoring microparticles in air

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08261904A (en) * 1995-03-22 1996-10-11 Mita Ind Co Ltd Fine particle concentration measuring device
JP2004340897A (en) * 2003-05-19 2004-12-02 Shimadzu Corp Method for measuring the density of suspended particulate matter in the atmosphere
JP2006349448A (en) * 2005-06-15 2006-12-28 Kowa Co Atmospheric particulate measuring device
JP2008139294A (en) * 2006-11-08 2008-06-19 Honda Motor Co Ltd Detection apparatus and method
JP3158839U (en) * 2010-01-07 2010-04-22 独立行政法人産業技術総合研究所 PM2.5 classifier for normal high volume air sampler

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