Method and device for improving eddy current detection rate
An eddy current detection and speed technology, which is applied in the direction of measuring devices, instruments, and material analysis through electromagnetic means, can solve the problems of large loss of ferromagnetic materials, affecting detection speed, and decreased sensitivity, so as to increase detection speed and expand detection Area, the effect of improving work efficiency
Pending Publication Date: 2021-12-31
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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[0003] Due to the great loss of ferromagnetic materials to the eddy current field, the excitation frequency of the far-field eddy current is mostly set below tens of hertz or hundreds of hertz, which greatly affects the detection rate
For example, in the in-service eddy current inspection of non-ferrous metal pipelines in service, in order to improve efficiency, most of them require the sensor to travel at a speed of more than 1m per second. Therefore, as far as the detection device is concerned, the excitation frequency is required to be above 5 kHz. Due to the high-frequency electromagnetic loss, far-field eddy current detection technology can only be used for detection, and the corresponding excitation frequency is only below a few hundred Hz. Based on the current quadrature detection technology, its detection speed and efficiency are almost an order of magnitude less, and it is difficult to achieve high efficiency. detection work
There are two problems here. First, although increasing the excitation frequency can increase the detection speed, the detection sensitivity will decrease; second, reducing the excitation frequency will reduce the detection efficiency.
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[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0035] Such as figure 1 A method for improving the detection rate of eddy current is shown, which is used in the production of metal pipes and rods or in-service detection and monitoring. It is characterized in that the detection speed is increased after the electromagnetic detection signals are superimposed at the same position through sequential detection by more than one moving detection coil. The specific method steps are as follows:
[0036] a. Detection signal extraction: more than one electromagnetic eddy current detection sensor of the multi-channel detection sensor extracts the electromagnetic eddy current detection signal at the same position;
[0037] b. Image matching and superposition: superimpose the detection signals of different channels at the same position on the electromagnetic eddy current detection signal collected in step...
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The invention relates to a method and a device for improving eddy current detection rate. The device and method are used for in-service electromagnetic eddy current detection of a metal tube rod 1. The detection device 2 comprises an excitation coil (21) and one or more detection coils (22), and is characterized in that the one or more detection coils (21) are arranged on the same straight line in the moving direction of electromagnetic eddy current moving detection. During electromagnetic eddy current movement detection, the detection coils arranged on the same straight line detect the same position passing through a detected object, and effective detection data of the multiple detection coils are selectively matched and superposed to form new electromagnetic detection data. Under the condition that the detection sensitivity is not influenced, the detection speed can be increased, and the working efficiency can be improved.
Description
technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a sensor device and a detection method technology for far-field eddy current detection of metal pipe rods, especially small-diameter in-service steel pipes, and in particular to a method and device for improving the eddy current detection rate. Background technique [0002] The far-field eddy current electromagnetic detection technology is suitable for the detection of small-diameter steel pipes in service for special equipment such as electronics and petrochemicals. But in general, whether it is a small-diameter metal pipe in production or in service, the length and quantity of the pipes to be inspected are quite large. The inspection speed is the key to improving work efficiency, and it is also the trend of requiring high-efficiency automated production and automated operation equipment. , so improving the detection speed is also crucial. [0003] Since the fer...
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Login to View More IPC IPC(8): G01N27/90G01N27/904
CPCG01N27/904G01N27/9046G01N27/9006
Inventor戴永红沈淮林俊明黄松岭曾志伟
OwnerEDDYSUN (XIAMEN) ELECTRONICS CO LTD