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Measuring equipment, environmental measuring equipment and measuring methods

A technology for measuring equipment and measuring containers, which can be used in measuring devices, particle and sedimentation analysis, suspension and porous material analysis, etc., and can solve problems such as low measurement accuracy, low measurement accuracy, and difficult continuous measurement of concentration

Active Publication Date: 2021-10-08
FUJITSU LTD
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Problems solved by technology

Therefore, the analog detection method has high measurement accuracy for high concentration of particulate matter, but has lower measurement accuracy for low concentration of particulate matter compared with high concentration of particulate matter
In the case of measuring low-concentration fine particulate matter by an analog detection method, the measurement accuracy of low-concentration fine particulate matter is relatively lower than that of high-concentration fine particulate matter due to, for example, instability of light intensity of light emitted from a light source
[0008] Therefore, it is difficult to continuously measure the concentration of particulate matter in the range from a low concentration of particulate matter to a high concentration of particulate matter with a simple measurement device using a light scattering method

Method used

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  • Measuring equipment, environmental measuring equipment and measuring methods
  • Measuring equipment, environmental measuring equipment and measuring methods
  • Measuring equipment, environmental measuring equipment and measuring methods

Examples

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Embodiment approach

[0027] figure 1 is a view showing a measuring device according to an embodiment. figure 1 The shown measuring device 1 comprises a measuring vessel 11 , a switch 12 , a first circuit 13 , a second circuit 14 , a switch 15 , a controller 16 and an output device 17 .

[0028] A virtual impactor 21 is installed at the air inlet 11A of the measurement container 11 . The virtual impactor 21 allows fine particulate matter having a diameter smaller than the measurement target particle diameter to pass. A fan 22 is installed at the air outlet 11B of the measurement container 11 . In this example, a light source 23 and a photodetector 24 are installed in the measurement container 11 . In the case of driving the fan 22 to rotate, the particulate matter is introduced into the measurement container 11 from the air inlet 11A through the virtual impactor 21, the light from the light source 23 is irradiated to the particulate matter, and the photodetector 24 receives the particulate matte...

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Abstract

The invention relates to a measuring device, an environmental measuring device and a measuring method. The measuring device includes: a measuring container including an air inlet and an air outlet; a fan; a light source configured to illuminate the particulate matter with light; a light detector configured to detect scattered light from the particulate matter; a first circuit , which is configured to detect individual particles of particulate matter based on the output of the photodetector; a second circuit configured to detect a population of microparticles of particulate matter based on the output of the photodetector; a switch configured to switch to One of a first state and a second state, in the first state, the output of the photodetector is input to the first circuit, and in the second state, the output of the photodetector is input to the second circuit; and a controller , which is configured to control the driving and stopping of the fan, the turning on and off of the light source and the switching of the state of the switch.

Description

technical field [0001] Embodiments discussed herein relate to measurement devices, environmental measurement devices, and measurement methods for measuring concentrations of particulate matter. Background technique [0002] The concentration of particulate matter contained in the atmosphere is used as one of the indicators of air pollution. For example, in recent years, many atmospheric measurement stations have been installed to measure the concentration of particulate matter such as PM2.5 in relation to the impact on health. Atmospheric measuring stations measure the concentration of fine particulate matter using, for example, beta (β) ray attenuation type measuring devices or Tapered Element Oscillating Microbalance (TEOM) type measuring devices. However, since these measuring devices are expensive and large in size, they are not suitable for eg individual use. [0003] Meanwhile, a simple measurement device using a light scattering method has been proposed. Such a mea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/06G01N15/02
CPCG01N15/06G01N15/0255G01N15/0205G01N2015/0693G01N2015/0261G01N2015/025G01N2015/0046G01N15/1459
Inventor 高须良三
Owner FUJITSU LTD
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