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High-precision self-matching boundary dimension measurement method applied to high-speed condition

A technology of external dimensions and measurement methods, which is applied in the direction of measuring devices, instruments, and the use of ultrasonic/sonic/infrasonic waves, etc., can solve problems such as mechanical installation deviation, deviation value amplification, and probe axis deviation, so as to eliminate influence and eliminate mechanical installation errors and the effect of acquisition system error

Active Publication Date: 2019-07-05
RES INST OF NUCLEAR POWER OPERATION +1
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Problems solved by technology

[0011] 2) Probe axis deviation
However, there is a certain degree of deviation in the mechanical installation, so the above deviation value will be magnified

Method used

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  • High-precision self-matching boundary dimension measurement method applied to high-speed condition
  • High-precision self-matching boundary dimension measurement method applied to high-speed condition
  • High-precision self-matching boundary dimension measurement method applied to high-speed condition

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Embodiment Construction

[0061] A method for measuring high-precision self-matching external dimensions under high-speed conditions, the method specifically includes:

[0062] Step 1. Calibrate the collected data of the inspected pipe;

[0063] Place the calibrated pipe in the detection system, and use two probes to collect the external dimension data of the inspected pipe, where the length of the collected signal is greater than 20 cycles, and the data collected by the two probes are respectively recorded as t 1 and t 2 ; Among them, the probe rotates one week as a cycle;

[0064] Step 2. Perform periodic analysis on the collected calibration signals of the inspected pipes;

[0065] Step 2.1, perform signal preprocessing, and filter out abnormal signals;

[0066] Use methods such as frequency domain filtering, median filtering or median filtering to filter out abnormal signals such as high frequency bands and burrs in the collected signal;

[0067] Step 2.2, calculating and obtaining the flag bit...

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Abstract

The invention belongs to the technical field of non-destructive detection and discloses a high-precision self-matching boundary dimension measurement method applied to a high-speed condition. The method specifically includes the following steps that: 1, the data of a pipe to be detected are acquired, so that calibration can be performed; 2, periodic analysis is performed on the collected calibration signal of the pipe to be detected; 3, in-phase data statistical analysis is performed on the periodic data of data acquired by two probes; 4, signal acquisition is performed on the pipe to be detected; and 5, calculation is performed, so that the boundary dimensions of the pipe to be detected can be obtained. The step 2 further includes the following steps that: 2.1, signal preprocessing is performed so as to filter out abnormal signals; 2.2 the flag bits of the periods of the acquired data are obtained through calculation; and 2.3, each of the periodic data of the data acquired by the twoprobes is re-sampled. With the high-precision self-matching boundary dimension measurement method applied to the high-speed condition of the invention adopted, in-phase angle comparison is adopted, sothat the influence of mechanical installation errors and acquisition system errors can be eliminated to the greatest extent.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a high-precision self-matching external dimension measurement method under high-speed conditions. Background technique [0002] Nuclear-grade small-diameter pipes refer to special precision pipes with an outer diameter within the range of 6-20mm, which are widely used in core components such as nuclear power reactor cores and heat exchangers. Nuclear-grade small-diameter tubes are used a lot during the construction and operation of nuclear power units. Taking the AP1000 evaporator as an example, each evaporator has more than 10,000 heat exchange tubes, with a total length of about 225,000M. For this reason, nuclear power needs to perform rapid and automatic measurement of pipes before installation to ensure the measurement efficiency and accuracy of pipes. When the traditional dual-probe water immersion ultrasonic automatic detection system is used fo...

Claims

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Application Information

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IPC IPC(8): G01B17/00
CPCG01B17/00
Inventor 张益成聂勇蔡家藩谢航冯美名陈姝
Owner RES INST OF NUCLEAR POWER OPERATION
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