Title:
DUST MONITOR
Document Type and Number:
Japanese Patent JP3545816
Kind Code:
B2
Abstract:
PURPOSE: To obtain a highly accurate dust monitor in which the adhesion of dust to a detection system is suppressed.
CONSTITUTION: An exhaust pipe 14a extending from an exhaust section 14 is coupled with a pump which is operated to introduce the outer air through an air introduction pipe 10. The outer air is introduced through the air introduction pipe 10 into a filter paper chamber 100 where the outer air passes through a sampling filter paper 18 and discharged through the exhaust pike 14a. A doughnut type scintillator plate 20 is fixed to the case 12 while opposing the sampling filter paper 18 and the air introduction pipe 10 is inserted into a through hole of the scintillator plate 20. The scintillator plate 20 constitutes one wall face of the filter paper chamber 100, i.e., one wall face of an air channel, and a photomultiplier 24 is disposed on the outside of the air channel. Since the photomultiplier 24 is not exposed directly to the air flow, dust scarcely adheres thereto.
Inventors:
Shohei Matsubara
Toshinori Oshima
Toshinori Oshima
Application Number:
JP25816194A
Publication Date:
July 21, 2004
Filing Date:
October 24, 1994
Export Citation:
Assignee:
Aloka Co., Ltd.
International Classes:
G01T1/167; G01T1/20; G01T7/02; (IPC1-7): G01T1/167; G01T1/20; G01T7/02
Domestic Patent References:
| JP61111483A | ||||
| JP5209965A | ||||
| JP5142354A | ||||
| JP6130153A |
Attorney, Agent or Firm:
Kenji Yoshida
Jun Ishida
Jun Ishida
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