Technical Diagnostics and Non-Destructive Testing, 2019, №02



2019 №02 (03)

DOI of Article 10.15407/tdnk2019.02.04

2019 №02 (05)

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Technical Diagnostics and Non-Destructive Testing #2, 2019, pp. 23-29

Measurement of temperature and diameter of a heated item section

V.A.Porev, A.S.Tomashuk

NTUU «Igor Sikorsky Kyiv Polytechnic Institute». 37 Peremohy Prosp., 03056, Kyiv, Ukraine. E-mail: tomashuk.alexander@gmail.com
 
 
Abstract:
During high-temperature manufacture or treatment of a cylindrical item, it is necessary to obtain information about its energy and geometrical parameters. Application of optical and digital image processing methods will be the most successful solution to achieve the set goal. Optical methods, which are based on the laws of geometrical optics, refraction, interference and diffraction, allow measuring the required parameters with a high accuracy that enables improving the manufactured item quality. The paper describes the mathematical model and design of an optical device for conducting the procedures of measurement of the diameter and temperature with a high accuracy. These methods allow controlling the diameter and temperature on a defocused image. The results of development of the optical device are tied to the mathematical model of dieless drawing of wire, as one of the high-temperature processes. The results of device calibration by temperature showed some advantages of application of the proposed contactless method over the contact one – a thermometer with a thermocouple. An approach is proposed for measurement of surface temperature of an item, moving at a certain speed, which is equal to that of image forming speed. This approach is based on the methods of digital image processing. 21 Ref., 6 Fig.
Keywords: nondestructive testing, optics, diffraction, temperature, diameter, shape-memory effect, production process.

Received: 21.03.2019
Published: 14.05.2019

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