Method of simultaneously measuring displacement and thickness of metal workpiece
A metal workpiece and displacement technology, which is applied in the field of information measurement, can solve the problems that the measuring element and the measured element cannot be in contact, the measurement cannot be carried out normally, and the scope of use is limited, so as to achieve multi-target measurement, compact structure and flexibility. high effect
Active Publication Date: 2019-05-28
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
These methods either require the measuring element to be installed on both sides of the metal, or the measuring element needs to be in contact with the metal. However, in many occasions, the measured workpiece is in a state of motion, shielding or high temperature, resulting in the inability of the measuring element and the measured element to be in contact. Unable to work normally, low flexibility, limited scope of use
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[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0026] see Figure 1 to Figure 3 , the eddy current sensor provided by the preferred embodiment of the present invention can simultaneously measure the displacement and thickness of a metal workpiece. The eddy current sensor is excited by a specific signal to generate an eddy current distribution that is only sensitive to displacement information and is also sensitive to displacement information...
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The invention belongs to the technical field of information measurement, and discloses a method of simultaneously measuring the displacement and thickness of metal workpiece. The method comprises thefollowing steps that 21, an eddy-current sensor is arranged on one side of the metal workpiece and generates low-frequency sinusoidal excitation signals; 22, when the eddy-current sensor is not adjacent to the metal workpiece, output signals and current signals of the eddy-current sensor are collected, and when the eddy-current sensor is adjacent to the metal workpiece, data is collected again; 23, obtained measurement data of multiple groups of the metal workpiece with known thickness and displacement is subjected to curve fitting to obtain a mathematical expression of the eddy-current sensor; 24, step 21-22 are executed for any metal workpiece to be measured, and obtained data is taken into the mathematical expression to measure the displacement and thickness of the metal workpiece. According to the method, the displacement and thickness are simultaneously measured through special excitation signals; the method is simple, easy to implement, high in flexibility and wide in applicationrange.
Description
[0001] This application is a divisional application of the application number 201710604578.1, the application date is July 24, 2017, and the invention name is "an eddy current sensor and method that can simultaneously measure the displacement and thickness of metal workpieces" technical field [0002] The invention belongs to the technical field related to information measurement, and more specifically relates to a method for simultaneously measuring the displacement and thickness of a metal workpiece. Background technique [0003] The measurement of the thickness of metal workpieces is a problem that often needs to be faced in the process of industrial production and manufacturing, such as the thickness measurement or inspection of plates in the metallurgical industry, the thickness monitoring of corroded pipes in chemical production equipment, and the inspection of machined parts. Non-disassembly online thickness measurement, thickness measurement of metal casings such as a...
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IPC IPC(8): G01B7/02G01B7/06
CPCG01B7/02G01B7/10
Inventor 李国民郝兵杰白坤
Owner HUAZHONG UNIV OF SCI & TECH