Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1987-10-30
1989-08-15
Yasich, Daniel M.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
374153, 374148, G01K 1100, G01K 1306
Patent
active
048569119
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for measuring the temperature of a running filiform element,--without mechanical contact with the element, and to devices applying the method.
The term "filiform element" will be used hereinafter to denote any elongate body, such as a metallurgical wire, a tube having a circular or polygonal section, a metal strip or band, sections, etc. in continuous or discontinuous movement.
The continuous follow-up of production processes frequently requires a good knowledge of the temperature of the products moving past.
Measurement of the temperature of a wire leaving a draw die or of a strip leaving a rolling mill can be made by contact with a thermocouple or by heat conduction means intended to come into contact with the surface of the element. This technique is possible only if the product moves past slowly, while in addition the validity of the measurement is dependent on the quality of the contact.
Use is also made of infrared thermometers or radiothermometers, which are inaccurate in use on the one hand because the emissivity of the wire is not known and will vary, and on the other hand because of the difficulty of sighting with a wire of small diameter in a clean environment. In the medium temperature (T.ltoreq.700.degree. C.) and/or low emissivity range their use is not reliable.
Temperature measurement in accordance with the invention makes it possible to eliminate the disadvantage of making contact between the detection means and the element. It is also insensitive to the thermooptical characteristics of the element and to its surface state. The range of temperatures measured is extended by from 50.degree. to more than 500.degree. C. with an accuracy of the order of .+-.5% and with low inertia because the response time is short.
The process according to the invention permits measurement during movement without disturbing the wire. It is simple to apply, and therefore easy to carry out, inexpensive and highly reliable.
According to the invention a fluid, whose temperature and flow have been measured, is delivered onto the moving filiform element, a part of the fluid is collected in order to measure its temperature, the results are analyzed, and the temperature of the element is deduced by comparison with a standardized scale.
The fluid is preferably delivered in such a manner that it impinges by impact with the element, whereupon it is conducted along a portion of the element.
The invention relates generally to any device having a chamber through which the element passes, a fluid injection device delivering the fluid into the chamber and around the element, and means for measuring the temperature and flow of the fluid before and then after its passage through the chamber, in order to deduce therefrom the temperature of the element after analysis of these temperatures and comparison with a standardized scale.
The chamber will be provided with thermal insulation and its mass reduced to the minimum in order to lessen losses of fluid and to shorten the response time of the measurement system.
As an alternative, a part of the fluid escaping from the chamber may be recycled by a recuperation device (suction and acceleration by fan or ejector). The fluid injected may also be subjected to previous thermal regulation. Thus, for certain applications, it may be advantageous for the injected fluid to be substantially at the temperature of the outgoing fluid.
The following description, given by way of example, will make it clear how the invention can be applied.
FIG. 1 is a schematic view illustrating the process according to the invention.
FIG. 2 is a view in longitudinal section of a device for measuring the temperature of a filiform element.
FIG. 3 is a view in longitudinal section of an alternative form of construction of the device shown in FIG. 2.
Referring to FIG. 1, the measurement process for a filiform element, which in this particular case is a wire 1, comprises the ejection around this wire of a fluid (arrow 2), for example air, with a determined rate of flow Q, the t
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patent: 3776039 (1973-12-01), Bowen
patent: 4191052 (1980-03-01), Drzewiecki
patent: 4430010 (1984-02-01), Brenner et al.
patent: 4501504 (1985-02-01), Urmenyi et al.
patent: 4595299 (1986-06-01), Lindwall et al.
Delikat Catherine
Neveu Daniel R. M.
Roth Bernard M.
Bertin & Cie
Breiner A. W.
Yasich Daniel M.
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