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Title:
METHOD AND APPARATUS FOR MEASURING GAS FLOW
Document Type and Number:
Japanese Patent JPH0735763
Kind Code:
A
Abstract:

PURPOSE: To measure gas flow without contact based on an intensity change of scattered light when a certain amount of fine particles having a certain grain size is continuously discharged from a tube as an air current tracer and a slope of belt-like laser light applied laterally straight to perpendicularity of the trace.

CONSTITUTION: Belt-like laser light can be individually applied from two directions which are perpendicular to each other by a cylindrical lens 13 or the like, and a certain amount of fine particles 22 having a constant grain size is continuously discharged from vertically above a virtual intersection 20 of the light as an air current tracer. A laser light path 18 is provided there, and an entire system is horizontally rotated with the virtual intersection 20 as the center and stopped at a point where intensity of scattered light is the maximum. Then the light path is changed to a light path 19, a stage 17 is slid and stopped at a point where the intensity of scattered light is the maximum, and further the cylindrical lens 13 is rotated with an optical axis as the center, whereby with the belt-like laser light rotated with the optical axis as the center, the most particles 22 come against the belt-like laser light when the intensity of the scattered light is the maximum, so that a rotation angle of the cylindrical lens 13 can be determined as an angle of the gas flow.


Inventors:
MINOSHIMA MASAHIKO
Application Number:
JP1993000179650
Publication Date:
February 07, 1995
Filing Date:
July 21, 1993
Export Citation:
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Assignee:
NEC CORP
International Classes:
G01P13/00; G01P5/26; G01P13/02; (IPC1-7): G01P13/00
Domestic Patent References:
JPS6267419A1987-03-27
Attorney, Agent or Firm:
岩佐 義幸