Flow velocity measuring unit

Details Flow velocity measuring unit Flow velocity measuring unit

1998-07-10

2001-04-10

Patel, Harshad (Department: 2855)

Measuring and testing

Gas analysis

Moisture content or vapor pressure

C073S061480

Reexamination Certificate

active

06212951

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to the field of control and measuring technology, and more exactly, to a unit for measuring the flow of continuous optically transparent mediums for example, optical flow velocity measuring units using Doppler methods on gases, liquids, etc.
DESCRIPTION OF RELATED ART
A flow velocity measuring unit is known which comprises an optical unit including a laser and a photodetector (SU No. 1053005, 1982).
However, the known apparatus does not ensure sufficiently accurate measurement because of the possibility of contamination of elements of the optical unit with impurities in the medium being studied.
A flow velocity measuring unit is known which comprises an optical unit including a laser and a photodetector (SU No. 48 836, 1973).
However, this known apparatus does not prevent contamination of elements of the optical unit with impurities of the medium being studied, and this reduces the accuracy of measurement.
SUMMARY OF THE INVENTION
The principal object at the base of the invention is to provide an apparatus which ensures that the necessary accuracy of flow velocity measurement is achieved with high reliability.
The technical result is reduction of possible contamination of elements of the optical unit with impurities of the medium being studied.
This object is achieved in a flow velocity measuring unit comprising an optical unit including a laser and a photodetector, in that a gravitational filter provided by a pipe having a length at least three times greater than the diameter thereof is included in the measuring unit. The pipe is disposed above the surface of a pipeline one end of the pipe is mounted in the aperture made in the pipeline, and an optical unit is secured on the other end of the pipe. According to the invention, the gravitational filter may be also provided with a shut-off cock.
The essence of the invention is that the presence of a gravitational filter effect in a pipe in a certain length and diameter makes it possible to create a zone of stagnation of the medium being studied, for example, gas, at the input and the optical unit. This stagnation zone makes it possible to substantially reduce contamination of the elements of the optical unit.


REFERENCES:
patent: 3030802 (1962-04-01), Aarts et al.
patent: 4172428 (1979-10-01), Pariset
patent: 5920010 (1999-07-01), Derevyagin et al.
patent: 2546492 (1977-08-01), None
patent: 268481 (1965-03-01), None
patent: 481836 (1973-12-01), None
patent: 1053005 (1982-12-01), None
Abstract of SU 168481 of Mar. 1965.
Abstract of SU 481836 of 1973.
Abstract of SU 1053005 of 1982.

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