Measuring apparatus and measuring system

Patent metadata

Field	Value
Publication number	US-2016349168-A1
Application number	US-201615137412-A
Country	US
Kind code	A1
Filing date	Apr 25, 2016
Priority date	May 29, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A measuring apparatus includes a concentration measuring unit that measures a particle number concentration of a particle in gas; a humidity measuring unit that measures humidity of a surrounding to which the particle is exposed when the concentration measuring unit measures the particle number concentration; a first case in which the concentration measuring unit and the humidity measuring unit are accommodated, the first case having a first inlet and a first outlet; and a first exhausting unit that exhausts the gas in the first case from the first outlet; wherein the humidity measuring unit is disposed upstream of the concentration measuring unit in a flow path of the gas from the first inlet to the first outlet.

First claim

What is claimed is:

1 . A measuring apparatus comprising:
a concentration measuring unit that measures a particle number concentration of a particle in gas; a humidity measuring unit that measures humidity of a surrounding to which the particle is exposed when the concentration measuring unit measures the particle number concentration, the humidity being used when a mass concentration of the particle in the gas is calculated from information indicating a correlation of a mass of the particle to the humidity of the surrounding to which the particle is exposed, the particle number concentration measured by the concentration measuring unit, and the humidity of the surrounding to which the particle is exposed; a first case in which the concentration measuring unit and the humidity measuring unit are accommodated, the first case having a first inlet and a first outlet; and a first exhausting unit that exhausts the gas in the first case from the first outlet; wherein the humidity measuring unit is disposed upstream of the concentration measuring unit in a flow path of the gas from the first inlet to the first outlet.

2 . The measuring apparatus according to claim 1 , wherein:
the concentration measuring unit has a second case with a second inlet and a second outlet and also has a second exhausting unit that exhausts the gas in the second case from the second outlet; the flow path of the gas from the first inlet to the first outlet includes a flow path that passes through an interior of the second case and a flow path that passes between the first case and the second case without passing the interior of the second case; and a flow rate caused by the first exhausting unit is larger than a flow rate caused by the second exhausting unit.

3 . The measuring apparatus according to claim 2 , wherein when n designates an interval of measurements by the concentration measuring unit and V designates a volume of a space, in the flow path of the gas from the first inlet to the first outlet, between the first case and the second case from the second inlet to the first inlet, then the flow rate caused by the first exhausting unit is V/n or more.

4 . The measuring apparatus according to claim 1 , wherein:
the concentration measuring unit has a second case with a second inlet and a second outlet; the concentration measuring unit lacks a second exhausting unit that exhausts the gas in the second case from the second outlet; the flow path of the gas from the first inlet to the first outlet lacks a flow path that passes between the first case and the second case without passing an interior of the second case; and the concentration measuring unit is disposed in a space between the first case and the second case from the second inlet to the first inlet.

5 . The measuring apparatus according to claim 1 , further comprising a power supply unit that supplies electric power to the concentration measuring unit, wherein
the power supply unit is disposed downstream of the concentration measuring unit in the flow path of the gas from the first inlet to the first outlet.

6 . The measuring apparatus according to claim 1 , wherein the concentration measuring unit uses a scattered light detection method to measure the particle number concentration.

7 . The measuring apparatus according to claim 1 , further comprising a calculating unit that calculates the mass concentration of the particle in the gas from the information indicating the correlation of the mass of the particle to the humidity of the surrounding to which the particle is exposed, the particle number concentration measured by the concentration measuring unit, and the humidity of the surrounding to which the particle is exposed.

8 . The measuring apparatus according to claim 3 , wherein the space is enclosed by the second case, an internal surface including the first inlet, the internal surface being part of the first case, and a plane that is orthogonal to a gas flow direction in the second case and includes an end of the second inlet in a downstream direction of gas flow in the second case.

9 . The measuring apparatus according to claim 2 , wherein when a direction in which the second inlet and the second outlet are placed is parallel to a direction of gas flow in the first case, the humidity measuring unit is disposed in a space enclosed by the second case, an internal surface including the first inlet, the internal surface being part of the first case, and a plane that is orthogonal to a gas flow direction in the second case and includes an end of the second inlet in a downstream direction of gas flow in the second case.

10 . The measuring apparatus according to claim 2 , wherein when a direction in which the second inlet and the second outlet are placed differs from a direction of gas flow in the first case, the humidity measuring unit is disposed in a space enclosed by the second case, an internal surface including the first inlet, the internal surface being part of the first case, a plane that is orthogonal to a gas flow direction in the second case and includes an end of the second inlet in a downstream direction of gas flow in the second case, and a plane that passes a midpoint between a center of the second inlet and a center of the second outlet and is orthogonal to a straight line connecting the center of the second inlet and the center of the second outlet.

11 . The measuring apparatus according to claim 1 , further comprising an atmospheric pressure measuring unit that measures atmospheric pressure used to correct the particle number concentration measured by the concentration measuring unit, wherein
the atmospheric pressure measuring unit is disposed upstream of the concentration measuring unit in the flow path of the gas from the first inlet to the first outlet.

12 . A measuring system comprising:
a measuring apparatus that includes
a concentration measuring unit that measures a particle number concentration of a particle in gas,
a humidity measuring unit that measures humidity of a surrounding to which the particle is exposed when the concentration measuring unit measures the particle number concentration,
a first case in which the concentration measuring unit and the humidity measuring unit are accommodated, the first case having a first inlet and a first outlet, the humidity measuring unit being disposed upstream of the concentration measuring unit in a flow path of the gas from the first inlet to the first outlet, and
a first exhausting unit that exhausts the gas in the first case from the first outlet; and
a calculating unit that calculates a mass concentration of the particle in the gas from information indicating a correlation of a mass of the particle to the humidity of the surrounding to which the particle is exposed, the particle number concentration measured by the concentration measuring unit, and the humidity of the surrounding to which the particle is exposed.

Assignees

• Fujitsu Ltd

Inventors

• Takasu Ryozo

Classifications

• G01N15/1459

  the analysis being performed on a sample stream · CPC title

• G01N2015/0046

  in gas, e.g. smoke · CPC title

• G01N1/2273

  Atmospheric sampling · CPC title

• G01N5/02

  by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content {(absorption bulbs B01D53/00)} · CPC title

• G01N15/06 Primary

  Investigating concentration of particle suspensions (by weighing G01N5/00; investigating sedimentation of particle suspensions G01N15/04; investigating individual particles G01N15/10) · CPC title