Heat transfer tube eddy current detection differential channel signal symmetry measuring method
A differential channel and eddy current detection technology, applied in the direction of measuring devices, analysis materials, material magnetic variables, etc.
Pending Publication Date: 2019-07-05
RES INST OF NUCLEAR POWER OPERATION +1
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, the consistency detection of the differential channel signal of the probe has been manually identified, and there is no accurate measurement method and judgment basis.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0061] Collect calibration tube signal;
[0062] Calibrate all differential channels, set the phase of the through-hole signal to 40 degrees, and set the VVP voltage to 1V~10V;
[0063] Select the non-defect signal area, take N data points within this area, calculate the average value of the two components of the eddy current value XY, and use this average value as the center point; or refer to the Lisajous graph of the defect signal to set the figure The center point of the signal (the intersection point of the two lines) is taken as the center point.
[0064] Select the through-hole signal area of the differential channel, and determine the two endpoints A and B through the VPP measurement method;
[0065] By calculating the distance from point A and point B to the center point, A1 and A2 are obtained, and the neutrality is calculated.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the field of non-destructive detection of nuclear power plants and relates to a heat transfer tube eddy current detection differential channel signal symmetry measuring method. According to the method, the eddy current signals of a calibration tube are collected; set channels comprise differential channels; a set frequency refers to the detection frequency of the calibration tube; a defect-free position center point is determined according to the structure of the calibration tube; centering calculation is performed; the symmetry percentage Ds of a probe is determined,and a Ds qualified value is set; and whether the centering of the probe is qualified is detected according to the Ds qualified value. With the method adopted, the consistency of the differential channels of the probe can be effectively measured; when the probe is manufactured, and the manufacture mode and process of the probe are improved through the method; and with the measuring method adopted,the winding qualified rate of two coils of an inner-through self-comparison differential probe can be 100%.
Description
technical field [0001] The invention belongs to the field of non-destructive testing of nuclear power plants, and in particular relates to a method for measuring the symmetry of differential channel signals. Background technique [0002] The steam generator is used to cool the high-temperature and high-pressure medium of the primary circuit of the nuclear power plant. It is a vulnerable part of the entire primary circuit. According to the requirements of relevant inspection specifications, non-destructive testing of the evaporator heat transfer tube must be carried out regularly. At present, the mature and reliable detection scheme is to conduct eddy current detection on the heat transfer tube of the evaporator, and the relevant detection equipment and detection methods are very demanding in the in-service detection of nuclear power equipment. [0003] The entire eddy current detection system includes detection hardware and related software. The hardware includes eddy curren...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
CPCG01N27/9046
Inventor 冯美名廖述圣张益成陈姝刘辉
Owner RES INST OF NUCLEAR POWER OPERATION