Manufacturing method of nuclear power station eddy current testing probe

Abstract

The invention discloses a manufacturing method of a nuclear power station eddy current testing probe. An equivalent circuit of the probe is formed by connecting a direct current resistor Rdc and an inductor L in series and then connecting the direct current resistor Rdc and the inductor L with a parasitic capacitor Cs in parallel. The manufacturing method is characterized by comprising the following steps of: a, obtaining Cs and Rdc by adopting a numerical calculation method, and obtaining L by adopting a finite element calculation method; b, calculating the probe impedance by using a probe equivalent circuit model according to the calculated Cs, Rdc and L; c, obtaining an impedance frequency formula according to a required probe frequency range and the probe impedance; and d, determiningprobe parameters by using the impedance frequency formula according to the required impedance and frequency range so as to manufacture a probe meeting the requirements. A rapid, efficient, reliable and economic evaluation means is provided for selection of an eddy current detection probe.

Description

technical field [0001] The invention belongs to the field of nuclear power detection equipment, and in particular relates to a manufacturing method of a nuclear power plant eddy current detection probe. Background technique [0002] Various parameters need to be determined when designing and producing eddy current detection probes, including: ⑴ probe type: ⑵ relative dielectric constant of probe wire; ⑶ resistivity of probe wire; ⑷ when the probe has a magnetic core, the conductivity of the magnetic core; ⑸ When the probe has a magnetic core, the relative permeability of the magnetic core; ⑹ the outer diameter of the probe coil; ⑺ the inner diameter of the probe coil; ⑻ the outer diameter of the probe wire; ⑼ the inner diameter of the probe wire; ⑽ the height of the probe coil; When it is a differential coil, the distance between the two coils; ⑿When the probe has a magnetic core, the diameter of the magnetic core; ⒀When the probe has a magnetic core, the height of the magne...

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Problems solved by technology

[0002] Various parameters need to be determined when designing and producing eddy current detection probes, including: (1) probe type: (2) relative permittivity of probe wire; (3) resistivity of probe wire; (4) when the probe has a magnetic core, the conductivity of the magnetic core; (5) When the probe has a magnetic core, the relative permeability of the magnetic core; ⑹ the outer diameter of the probe coil; ⑺ the inner diameter of the probe coil; ⑻ the outer diameter of the probe wire; ⑼ the inner diameter of the probe wire; ⑽ the height of the probe coil; When it is a differential coil, the distance between the two coils; ⑿When the probe has a magnetic core, the diameter of the magnetic core; ⒀When the probe has a magnetic core, the height of the magnetic core; ⒁The current input to the probe; ⒂The winding method of the probe; At present, there is no clear method to determine the above parameters according to the required probe frequency. Most of them use the test after the winding is completed, and constantly adjust the parameters according to the test, and the production efficiency is extremely low.

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