Optical measuring arrangement

Details Optical measuring arrangement Optical measuring arrangement

1998-12-18

2001-07-10

Evans, F. L. (Department: 2877)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

C356S246000, C250S343000

Reexamination Certificate

active

06259527

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to an optical measuring arrangement for measuring, for particularly liquid or gaseous substances, the arrangement comprising at least one measuring head operating on an optical measuring band, and a measuring head holder comprising a hole for fastening and supporting the measuring head.
FIELD OF THE INVENTION
Liquid and gaseous substances are often measured optically, the wavelength range employed extending from ultraviolet radiation to the infrared range. In known solutions for measuring liquid or gaseous substances, the measuring heads are typically in contact with the substance to be measured. If the substance to be measured is fouling or corrosive, the measuring head works only short periods of time without maintenance. Consequently, the measuring head has to be cleaned or changed. When measurements are made to observe an industrial process, the entire process has to be stopped because of the maintenance of the measuring heads. Such interruptions are inconvenient and costly.
An attempt has been made to solve the problem by coating the measuring heads with protective material, which, however, wears away. In addition, between the measuring head and the rest of the process structure remain at least some rough points, to which solid matter contained in the substance to be measured adhere, thus hampering the optical measuring direction of the measuring head. Furthermore, it is difficult to seal the usually very small measuring head reliably to e.g. a process tube.
BRIEF DESCRIPTION OF THE INVENTION
It is an object of the invention to provide a method, and an equipment for implementing the method, to solve the above problems and to protect the measuring head against the fouling and/or damage caused by the substance to be measured.
This is achieved by a measuring arrangement of the type presented in the introduction, characterized in that the holder comprises for the hole an end piece, through which the measurement is to be performed; which is substantially transparent on the optical measuring band of the measuring head; and which separates the measuring head from the substance which is to be measured and which is disposed in the measuring area.
The system of the invention provides a plurality of advantages. The fouling and breaking of the measuring head can be easily prevented by protecting it from the influence of the substance to be measured. At the same time accumulation of solid matter hampering the optical operation is prevented at the measuring point, since the area of the measuring head is as even as the surrounding area.


REFERENCES:
patent: 3544798 (1970-12-01), Topol
patent: 5521384 (1996-05-01), Lynch
patent: 0327353 (1989-08-01), None

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