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Abnormal frequency point identification method based on character string comparison

A recognition method and string technology, applied in the field of abnormal frequency point recognition based on string comparison, can solve problems such as difficulty in adapting to future electronic circuit production needs, inadequate testing capabilities, etc., and achieve the effect of improving quality, reliability and efficiency.

Active Publication Date: 2015-03-25
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Description
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  • Application Information

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Problems solved by technology

Traditional detection methods are limited by "contact limitation" (restricted electrical contact and limited visual contact) (such as electromagnetic radiation under components), and there are some difficult problems to solve
Especially in the high-frequency circuit test, it is also difficult to meet the needs of future electronic circuit production.

Method used

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  • Abnormal frequency point identification method based on character string comparison
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  • Abnormal frequency point identification method based on character string comparison

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Embodiment Construction

[0031] Below, combine Figure 1 to Figure 6 The present invention is described further:

[0032] A method for identifying abnormal frequency points based on character string comparison, the process is shown in figure 1 , including the following steps:

[0033] Step 1, the EMScan scanner scans the standard circuit board and the circuit board to be tested under the power-on state, and obtains the frequency spectrum curve of the standard circuit board and the circuit board to be tested.

[0034] EMScan scanner (see figure 2 ) to complete the scanning of the standard circuit board and the circuit board to be tested under the power-on state, and obtain the spectrum curve image of the standard circuit board (see image 3 ) and the spectrum curve image of the board under test (see Figure 4 ).

[0035] In step 2, the spectral curve of the standard circuit board and the spectral curve of the circuit board to be tested are reconstructed using the neighborhood averaging method to ...

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Abstract

The invention provides an abnormal frequency point identification method based on character string comparison. The abnormal frequency point identification method comprises the following steps of: accomplishing the scanning to a standard circuit board and a to-be-tested circuit board in an electrifying state by utilizing an EMScan scanner so as to obtain frequency spectrum curves of the standard circuit board and the to-be-tested circuit board, reconstructing and processing the frequency spectrum curves to obtain interference-eliminated frequency spectrum curves, then converting a numerical value curve sequence to a symbol sequence by adopting a method based on key points, comparing character string sequences of the frequency spectrum curves of the to-be-tested circuit board and the normal circuit board so as to obtain the similarity values of the character string sequences of the to-be-tested circuit board and the normal circuit board, and finally judging the abnormal frequency point of the to-be-tested circuit board according to the similarity of the character string sequences of the frequency spectrum curves. The abnormal frequency point identification method provided by the invention solves the key technologies in the circuit quality ENI (equivalent noise input) detection, and can efficiently identify the abnormal frequency points in a spectrogram of a circuit module so as to enhance the quality detection efficiency of the circuit module.

Description

technical field [0001] The invention belongs to the technical field of circuit module fault detection, relates to a method for detecting circuit module faults by using electromagnetic radiation (EMI), and proposes a method for identifying abnormal frequency points based on character string comparison, which can be used in the quality detection of circuit modules in the electrical equipment industry . Background technique [0002] With the gradual development of information equipment in the direction of miniaturization, refinement, intelligence, and multi-function, the testing technology of circuit modules is also developing continuously. There are many kinds of testing technologies, which can realize the testing of various needs. With the increasing demand for assembly density, operating frequency, and reliability of circuit modules, the difficulty of debugging EMC\EMI products is also increasing. Traditional detection methods are limited by "contact limitation" (restricted...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/28G01R23/16
Inventor 甄立冬卢立东杨宗亮唐小平杨艳红
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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