Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1987-11-04
1989-10-10
Chapman, John
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73597, G01N 2900
Patent
active
048723444
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to methods of testing of carbon articles, and more particularly it relates to methods of nondestructive quality control of carbon articles.
2. Description of the Prior Art
There is known a method of nondestructive quality control of carbon articles (see, for example, "Geophysical Methods of Investigation of Oil and Gas Wells" edited by L. I. Pomeranets, Moscos, NEDRA Publishers, 1981, pp. 32-43, 160-186, in Russian). This method includes the steps of exciting acoustic vibrations in each carbon article taken from a group of carbon articles, and in a specimen cut out from at least one carbon article, converting acoustic vibrations in each carbon article and in the specimen into an electric signal having a frequency corresponding to the frequency of the acoustic vibrations, measuring the frequency of the electric signal to determine the frequency of the acoustic vibrations in the specimen and in the corresponding carbon article, determining the rate of propagation of the acoustic vibrations in each carbon article, measuring the specific electric resistance of the carbon articles, establishing the relationship of the rate of propagation of the acoustic vibrations in a carbon article to its specific resistance, determining the range of the rate of propagation of the acoustic vibrations from the range of predetermined values of the specific resistance, and selecting the carbon articles within the range of the rate of propagation of the acoustic vibrations, held representative of the quality of the carbon articles.
According to this method, the measuring of the specific electric resistance of the carbon articles is performed with a quantity of the carbon articles which is commensurate with the quantity of the articles in the whole lot of group, and the relationship of the rate of propagation of the acoustic vibrations in a carbon to its specific electric resistance is established for each carbon article in the lot.
It can be seen, however, that in this method the necessity of measuring the specific electric resistance of each carbon article, followed by establishing the relationship of the rate of propagation of the acoustic vibrations in the carbon article to its specific electric resistance cannot but decrease the rate of quality control of carbon articles and step up the input of labour and effort into the quality control procedure.
SUMMARY OF THE INVENTION
The present invention is to create a method of nondestructive quality control of carbon articles wherein the rate of propagation of acoustic vibrations, the specific electric resistance of the carbon articles and their relationship should be determined in a way providing for speeding up the rate of quality control of carbon articles and lowering the labour and effort input into the quality control procedure.
This is attained in a method of nondestructive quality control of carbon articles, including the steps of exciting acoustic vibrations in each carbon article taken from a group of carbon articles and in a specimen cut out from at least one carbon article, converting the acoustic vibrations in each carbon article and in the specimen into an electric signal having a frequency corresponding to the frequency of the acoustic vibrations, measuring the frequency of the electric signal to determine the frequency of the acoustic vibrations in a carbon article and in the specimen, determining the rate of propagation of the acoustic vibrations in the specimen and in the corresponding carbon article, determining the rate of propagation of the acoustic vibrations in each carbon article, measuring the specific electric resistance of the carbon articles, establishing the relationship of the rate of propagation of the acoustic vibrations in a carbon article to its specific electric resistance, determining the range of the rate of propagation of the acoustic vibrations from the range of predetermined values of the specific electric resistance, and selecting carbon articles falling wi
REFERENCES:
patent: 4326417 (1982-04-01), Migliori
V. N. Boganik, "Metody Operativnogo Obobschenia Promyslovogeofizicheskoi Informatsii", 1983. (Nedra Publ., Moscow) pp. 109-110.
L. I. Pomenants et al., "Promyslovo Geofizicheskaya Apparatura; Oborudovaine", 1966.(Nedra Publ., Moscow), p.134.
"Geophysical Methods of Investigation of Oil and Gas Wells", (Nedra Publishers, Moscow) 1981, pp. 32-33, 160-160, and 176 -179.
Glagovsky Boris A.
Grebenkin Anatoly F.
Lasukova Ijudmila P.
Moskovenko Igor B.
Chapman John
Vsesojuzny Nauchno-Issledovatelsky I Proektny Institut Aljuminie
LandOfFree
Method of nondestructive quality control of carbon articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of nondestructive quality control of carbon articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of nondestructive quality control of carbon articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1935248